13232 + Interview Questions in Physics Page 139 InterviewSolution

6901.	The area under the velocity-time graph gives:
Answer» The area under the velocity-time graph gives:

Discussion

6902.	Choose the correct option.1.Tonei.Frequencies that are integral multiple of fundamental frequency.2.Noteii.Sound of single frequency.3.Overtoneiii.Sound of multiple frequencies.4.Harmoniciv.Higher frequencies other than fundamental frequency.
Answer» Choose the correct option. $\begin{matrix} 1. & T o n e & i . & F r e q u e n c i e s t h a t a r e i n t e g r a l m u l t i p l e o f f u n d a m e n t a l f r e q u e n c y . 2. & N o t e & i i . & S o u n d o f s i n g l e f r e q u e n c y . 3. & O v e r t o n e & i i i . & S o u n d o f m u l t i p l e f r e q u e n c i e s . 4. & H a r m o n i c & i v . & H i g h e r f r e q u e n c i e s o t h e r t h a n f u n d a m e n t a l f r e q u e n c y . \end{matrix}$

6902.

Choose the correct option.1.Tonei.Frequencies that are integral multiple of fundamental frequency.2.Noteii.Sound of single frequency.3.Overtoneiii.Sound of multiple frequencies.4.Harmoniciv.Higher frequencies other than fundamental frequency.

Answer»

Choose the correct option.

$\begin{matrix} 1. & T o n e & i . & F r e q u e n c i e s t h a t a r e i n t e g r a l m u l t i p l e o f f u n d a m e n t a l f r e q u e n c y . 2. & N o t e & i i . & S o u n d o f s i n g l e f r e q u e n c y . 3. & O v e r t o n e & i i i . & S o u n d o f m u l t i p l e f r e q u e n c i e s . 4. & H a r m o n i c & i v . & H i g h e r f r e q u e n c i e s o t h e r t h a n f u n d a m e n t a l f r e q u e n c y . \end{matrix}$

Discussion

6903.	Each time the heart beats it requires 5 J of energy. If it has a power of 6 Watts, then how many times it beats in one minute
Answer» Each time the heart beats it requires 5 J of energy. If it has a power of 6 Watts, then how many times it beats in one minute

Discussion

6904.	Explain different types of potential energy.
Answer» Explain different types of potential energy.

Discussion

6905.	37.Why does B decay and only occur when neutral atomic mass of the original atom is at least 2 electron mass larger than that of final atom
Answer» 37.Why does B decay and only occur when neutral atomic mass of the original atom is at least 2 electron mass larger than that of final atom

Discussion

6906.	A whistle of frequency 540 Hz rotates in a circle of radius 2 m at an angular speed of 15 rad/sec. What will be the frequency heard by a listener a long distance away at rest with respect to the centre of the circle when the source is at B. (Speed of sound =330 m/s)
Answer» A whistle of frequency $540 Hz$ rotates in a circle of radius $2 m$ at an angular speed of $15 rad/sec$ . What will be the frequency heard by a listener a long distance away at rest with respect to the centre of the circle when the source is at $B$ . (Speed of sound $= 330 m/s$ )

Discussion

6907.	A current of 0.5 A flows in a conductor of resistance 15 Ω . Find the potential difference across the conductor.
Answer» A current of $0.5 A$ flows in a conductor of resistance $15 Ω$ . Find the potential difference across the conductor.

Discussion

6908.	an object is projected from ground with speed u at an angle θ with horizontal the radius of curvature of its trajectory at maximum height from ground is
Answer» an object is projected from ground with speed u at an angle θ with horizontal the radius of curvature of its trajectory at maximum height from ground is

Discussion

6909.	A solid body weighs 2.1 N in air and has a relative density of 8.4. How much will it weigh in a liquid of relative density 1.8?
Answer» A solid body weighs $2.1 N$ in air and has a relative density of $8.4$ . How much will it weigh in a liquid of relative density $1.8$ ?

Discussion

6910.	An object is 20 cm away from a concave mirror and it iswithin the focal length of the mirror. If the mirror is changedto a plane mirror, the image moves 15 cm closer to the mirror.Focal length of the concave mirror is -
Answer» An object is 20 cm away from a concave mirror and it iswithin the focal length of the mirror. If the mirror is changedto a plane mirror, the image moves 15 cm closer to the mirror.Focal length of the concave mirror is -

Discussion

6911.	109.The variation of the magnitude of the electric field with radial distance r due to a given configuration is depicted in the accompanying figure. The configuration could be (A) thick spherical conducting shell with a point charge at its centre. (B) thick spherical dielectric shell with a point mcharge at its centre. (C) conducting sphere with surface charge. (D) two neutral concentric thin conducting shells with a point charge at the centre.
Answer» 109.The variation of the magnitude of the electric field with radial distance r due to a given configuration is depicted in the accompanying figure. The configuration could be (A) thick spherical conducting shell with a point charge at its centre. (B) thick spherical dielectric shell with a point mcharge at its centre. (C) conducting sphere with surface charge. (D) two neutral concentric thin conducting shells with a point charge at the centre.

Discussion

6912.	A person swims at 127° to River current.to meet Target on reaching just opposite to point on the other bank. The ratio of persons velocity in still water to River water velocity
Answer» A person swims at 127° to River current.to meet Target on reaching just opposite to point on the other bank. The ratio of persons velocity in still water to River water velocity

Discussion

6913.	The speed of a body is 2 m/s. The time it would take to cover a distance of 60 km is _______.
Answer» The speed of a body is 2 m/s. The time it would take to cover a distance of 60 km is _______.

Discussion

6914.	Angle between acceleration and displacemnent when a body is moving in a straight line with uniform acceleration mm
Answer» Angle between acceleration and displacemnent when a body is moving in a straight line with uniform acceleration mm

Discussion

6915.	89.The velocity v of a particle moving in positive x axis is according to relation v=root(4x) . If at t=0 particle is at x=0, then the velocity and acceleration at t=2s are given as respectively 4m/s 4m/s2 2m/s 2m/s2 2m/s 4m/s2 4m/s 2m/s2
Answer» 89.The velocity v of a particle moving in positive x axis is according to relation v=root(4x) . If at t=0 particle is at x=0, then the velocity and acceleration at t=2s are given as respectively 4m/s 4m/s2 2m/s 2m/s2 2m/s 4m/s2 4m/s 2m/s2

Discussion

6916.	A boy moving with constant acceleration from A to B in the straight line AB has velocities v(A) and v(B) at A and B respectively. Time taken by the boy to move from A to C is twice of that from C to B, where C is the mid-point of AB. The ratio of v(A) to v(B) is________?
Answer» A boy moving with constant acceleration from A to B in the straight line AB has velocities v(A) and v(B) at A and B respectively. Time taken by the boy to move from A to C is twice of that from C to B, where C is the mid-point of AB. The ratio of v(A) to v(B) is________?

Discussion

6917.	The magnifying power of astronomical telescope and terrestrial telescope is the same. Why?
Answer» The magnifying power of astronomical telescope and terrestrial telescope is the same. Why?

Discussion

6918.	definition of one light year
Answer» definition of one light year

Discussion

6919.	a ball of mass m and density p is immersed in a liquid of density 3p at a depth h and released . to what height will the ball jump up above the surface of liquid ?
Answer» a ball of mass m and density p is immersed in a liquid of density 3p at a depth h and released . to what height will the ball jump up above the surface of liquid ?

Discussion

6920.	A boy have a mass of 50 kg. What would be his weight on the Earth? (g = 10 ms−2)
Answer» A boy have a mass of 50 kg. What would be his weight on the Earth? ( $g = 10 m s^{- 2}$ )

Discussion

6921.	A ball hits a wall horizontally at 6.0 m s−1. It rebounds horizontally at 4.4 m s−1. The ball is in contact with the wall for 0.040 s. What is the acceleration of the ball?
Answer» A ball hits a wall horizontally at 6.0 m s⁻¹. It rebounds horizontally at 4.4 m s⁻¹. The ball is in contact with the wall for 0.040 s. What is the acceleration of the ball?

Discussion

6922.	50. The parallax of a heavenly body measured from two points diametrically opposite on equator of earth is 2.0 minute. If radius of earth is 6400 km,calculate distance of heavenly body.
Answer» 50. The parallax of a heavenly body measured from two points diametrically opposite on equator of earth is 2.0 minute. If radius of earth is 6400 km,calculate distance of heavenly body.

Discussion

6923.	Question 1 Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5Ω resistor, a 8Ω resistor, and a 12Ω resistor, and a plug key, all connected in series.
Answer» Question 1 Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a $5 Ω$ resistor, a $8 Ω$ resistor, and a $12 Ω$ resistor, and a plug key, all connected in series.

Discussion

6924.	If Ankit travels a distance of πR along the circumference of a circle with radius R, his displacement will be:
Answer» If Ankit travels a distance of $π R$ along the circumference of a circle with radius $R$ , his displacement will be:

Discussion

6925.	In ecoR1 we get heterogenous fragments because it is not cutting sequence properlyRight?
Answer» In ecoR1 we get heterogenous fragments because it is not cutting sequence properly Right?

Discussion

6926.	A person driving a car with speed 72 km/h suddenly sees a boy crossing the road.If the distance moved by the car before the person applies brakes is 5m.Then reaction time of person is}(1) 0.5s(2) 0.10s(3) 10s(4) 0.25
Answer» A person driving a car with speed 72 km/h suddenly sees a boy crossing the road.If the distance moved by the car before the person applies brakes is 5m.Then reaction time of person is}(1) 0.5s(2) 0.10s(3) 10s(4) 0.25

Discussion

6927.	If 9 g of H_2O is electrolysed completely with 50% current efficiency(1) 1 F of electricity will be needed(2) 3 F of electricity is needed(3) 5.6 L of O_2 at STP will be formed(4) 11.2 L of O_{} at STP will be formed
Answer» If 9 g of H_2O is electrolysed completely with 50% current efficiency(1) 1 F of electricity will be needed(2) 3 F of electricity is needed(3) 5.6 L of O_2 at STP will be formed(4) 11.2 L of O_{} at STP will be formed

Discussion

6928.	47.Consider a vernier calliper in which each 1 cm on the main scale is divided into 8 divisions and a screw gauge with 100 divisions on its circular scale. In the vernier calliper, 5 divisions on the vernier scale coincide with 4 divisions on the main scale and in the screw gauge, one complete rotation of the circular scale moves it by two divisions on the linear scale. Then: (a) If the pitch of the screw gauge is twice the least count of the vernier calliper, the least count of the screw gauge is 0.01 mm. (b) If the pitch of the screw gauge is twice the least count of the vernier calliper, the least count of the screw gauge is 0.005 mm. (c) If the least count of the linear scale of the screw gauge is twice the least count of the vernier calliper, the least count of the screw gauge is 0.01 mm. (d) If the least count of the linear scale of the screw gauge is twice the least count of the vernier calliper, the least count of the screw gauge is 0.005 mm.
Answer» 47.Consider a vernier calliper in which each 1 cm on the main scale is divided into 8 divisions and a screw gauge with 100 divisions on its circular scale. In the vernier calliper, 5 divisions on the vernier scale coincide with 4 divisions on the main scale and in the screw gauge, one complete rotation of the circular scale moves it by two divisions on the linear scale. Then: (a) If the pitch of the screw gauge is twice the least count of the vernier calliper, the least count of the screw gauge is 0.01 mm. (b) If the pitch of the screw gauge is twice the least count of the vernier calliper, the least count of the screw gauge is 0.005 mm. (c) If the least count of the linear scale of the screw gauge is twice the least count of the vernier calliper, the least count of the screw gauge is 0.01 mm. (d) If the least count of the linear scale of the screw gauge is twice the least count of the vernier calliper, the least count of the screw gauge is 0.005 mm.

Discussion

6929.	acceleration=d^2(x) divided by dt^2 or (dt)^2 that is square is only for t or both dt
Answer» acceleration=d^2(x) divided by dt^2 or (dt)^2 that is square is only for t or both dt

Discussion

6930.	If the radius of Earth shrinks by 1.5%(Mass remaining same), then the value of gravitational acceleration changes by?
Answer» If the radius of Earth shrinks by 1.5%(Mass remaining same), then the value of gravitational acceleration changes by?

Discussion

6931.	An object of mass 16 kg moving with an acceleration of 3 metre second square. Calculate the applied force if the same force is applied on an object of mass 24 kg how much will be the acceleration?
Answer» An object of mass 16 kg moving with an acceleration of 3 metre second square. Calculate the applied force if the same force is applied on an object of mass 24 kg how much will be the acceleration?

Discussion

6932.	A ball is moving over a horizontal smooth surface with a constant velocity. What type of forces are acting on the ball?
Answer» A ball is moving over a horizontal smooth surface with a constant velocity. What type of forces are acting on the ball?

Discussion

6933.	the nature of graph drawn between dispalcement in th second and time t of a uniformly accelerated motion is -1-a straight line with negative y axis2-a parabola
Answer» the nature of graph drawn between dispalcement in th second and time t of a uniformly accelerated motion is - 1-a straight line with negative y axis 2-a parabola

Discussion

6934.	An object if mass m is floating in a liquid of density σ. If the object is of density ρ, then apparent weight of object in lquid i
Answer» An object if mass m is floating in a liquid of density σ. If the object is of density ρ, then apparent weight of object in lquid i

Discussion

6935.	a particle moves in x-y plane with a velocity v = 2yi + 4j. equation of the path followed by the particle is
Answer» a particle moves in x-y plane with a velocity v = 2yi + 4j. equation of the path followed by the particle is

Discussion

6936.	A person is standing at a distance of 'd' m from a wall and clapping at a rate of 4 claps per second. The echo of his clap coincides with his clap and he hears the echo of two claps after he stops clapping. What is 'd'? (Assume velocity of sound to be 340 ms−1)
Answer» A person is standing at a distance of 'd' m from a wall and clapping at a rate of 4 claps per second. The echo of his clap coincides with his clap and he hears the echo of two claps after he stops clapping. What is 'd'? (Assume velocity of sound to be $340 m s^{- 1}$ )

Discussion

6937.	The acceleration of particle is given by a = –ω2x and given that x = Asinωt, the velocity of particle will be
Answer» The acceleration of particle is given by a = –ω2x and given that x = Asinωt, the velocity of particle will be

Discussion

6938.	A block of mass m1 is pulled along a horizontal frictionless surface by a rope of mass m2. If a force F is applied at the free end of the rope, the force exerted by the rope on the block is
Answer» A block of mass $m_{1}$ is pulled along a horizontal frictionless surface by a rope of mass $m_{2}$ . If a force F is applied at the free end of the rope, the force exerted by the rope on the block is

Discussion

6939.	Calculate acceleration due to gravity at a height of 2000 km above the Earth's surface. Mass of Earth = 6×1024 kg, radius of Earth = 6.4×106 m and (Gravitational constant, G =6.7×10−11Nm2kg−2)
Answer» Calculate acceleration due to gravity at a height of $2000 k m$ above the Earth's surface. Mass of Earth = $6 \times 10^{24} k g$ , radius of Earth = $6.4 \times 10^{6}$ m and (Gravitational constant, G $= 6.7 \times 10^{- 11} N m^{2} k g^{- 2}$ )

Discussion

6940.	If an alpha-particle and a proton are projected ina magnetic field, perpendicular to field withsame linear momentum then the ratio of radiiof alpha-particle with proton is
Answer» If an alpha-particle and a proton are projected in a magnetic field, perpendicular to field with same linear momentum then the ratio of radii of alpha-particle with proton is

Discussion

6941.	Mention two demerits of a simple barometer and state how they are removed in a Fortin barometer.
Answer» Mention two demerits of a simple barometer and state how they are removed in a Fortin barometer.

Discussion

6942.	{ Two particles }A and }B start moving with velocities }}{20m/s and }30\sqrt2m/s along }x -axis and at an angle }}{45^° with }x -axis respectively in }xy -plane from origin. }}{ The relative velocity of }B w.rt. }A
Answer» { Two particles }A and }B start moving with velocities }}{20m/s and }30\sqrt2m/s along }x -axis and at an angle }}{45^° with }x -axis respectively in }xy -plane from origin. }}{ The relative velocity of }B w.rt. }A

Discussion

6943.	The distance between two consecutive compressions or rarefactions is called
Answer» The distance between two consecutive compressions or rarefactions is called

Discussion

6944.	Question 7Name the unit in which the calorific value of a fuel is expressed.
Answer» Question 7 Name the unit in which the calorific value of a fuel is expressed.

Discussion

6945.	What is the place called where vast amounts of oil is trapped?
Answer» What is the place called where vast amounts of oil is trapped?

Discussion

6946.	What is the minimum pressure required to compress 460 dm3 of air at 2 bar to 230 dm3 at 30^° c
Answer» What is the minimum pressure required to compress 460 dm3 of air at 2 bar to 230 dm3 at 30^° c

Discussion

6947.	A person takes T1 second on the stationary escalator to cover same dis†an ce by same velocit. If person is at rest on the escalator then time taken by him to cover same dis†an ce i
Answer» A person takes T1 second on the stationary escalator to cover same dis†an ce by same velocit. If person is at rest on the escalator then time taken by him to cover same dis†an ce i

Discussion

6948.	For passengers flying at very high altitude, the sky appears dark. Why?
Answer» For passengers flying at very high altitude, the sky appears dark. Why?

Discussion

6949.	Two persons of masses m and 2m are s†an ding on a horizontal smooth surface. They are initially separated by a dis†an ce X_o. They slide on the horizontal surface as they pull a rope towards each other. they meet at what dis†an ce?
Answer» Two persons of masses m and 2m are s†an ding on a horizontal smooth surface. They are initially separated by a dis†an ce X_o. They slide on the horizontal surface as they pull a rope towards each other. they meet at what dis†an ce?

Discussion

6950.	A feather is dropped on the moon from a height of 167 m. The acceleration due to gravity on the moon is 1.67 ms−2. Determine the time taken by the feather to fall on the surface of the moon.
Answer» A feather is dropped on the moon from a height of $167 m$ . The acceleration due to gravity on the moon is $1.67 m s^{- 2}$ . Determine the time taken by the feather to fall on the surface of the moon.

Discussion

Explore topic-wise InterviewSolutions in .

The area under the velocity-time graph gives:

Choose the correct option.1.Tonei.Frequencies that are integral multiple of fundamental frequency.2.Noteii.Sound of single frequency.3.Overtoneiii.Sound of multiple frequencies.4.Harmoniciv.Higher frequencies other than fundamental frequency.

Each time the heart beats it requires 5 J of energy. If it has a power of 6 Watts, then how many times it beats in one minute

Explain different types of potential energy.

37.Why does B decay and only occur when neutral atomic mass of the original atom is at least 2 electron mass larger than that of final atom

A whistle of frequency 540 Hz rotates in a circle of radius 2 m at an angular speed of 15 rad/sec. What will be the frequency heard by a listener a long distance away at rest with respect to the centre of the circle when the source is at B. (Speed of sound =330 m/s)

A current of 0.5 A flows in a conductor of resistance 15 Ω . Find the potential difference across the conductor.

an object is projected from ground with speed u at an angle θ with horizontal the radius of curvature of its trajectory at maximum height from ground is

A solid body weighs 2.1 N in air and has a relative density of 8.4. How much will it weigh in a liquid of relative density 1.8?

An object is 20 cm away from a concave mirror and it iswithin the focal length of the mirror. If the mirror is changedto a plane mirror, the image moves 15 cm closer to the mirror.Focal length of the concave mirror is -

A person swims at 127° to River current.to meet Target on reaching just opposite to point on the other bank. The ratio of persons velocity in still water to River water velocity

The speed of a body is 2 m/s. The time it would take to cover a distance of 60 km is _______.

Angle between acceleration and displacemnent when a body is moving in a straight line with uniform acceleration mm

89.The velocity v of a particle moving in positive x axis is according to relation v=root(4x) . If at t=0 particle is at x=0, then the velocity and acceleration at t=2s are given as respectively 4m/s 4m/s2 2m/s 2m/s2 2m/s 4m/s2 4m/s 2m/s2

A boy moving with constant acceleration from A to B in the straight line AB has velocities v(A) and v(B) at A and B respectively. Time taken by the boy to move from A to C is twice of that from C to B, where C is the mid-point of AB. The ratio of v(A) to v(B) is________?

The magnifying power of astronomical telescope and terrestrial telescope is the same. Why?

definition of one light year

a ball of mass m and density p is immersed in a liquid of density 3p at a depth h and released . to what height will the ball jump up above the surface of liquid ?

A boy have a mass of 50 kg. What would be his weight on the Earth? (g = 10 ms−2)

A ball hits a wall horizontally at 6.0 m s−1. It rebounds horizontally at 4.4 m s−1​. The ball is in contact with the wall for 0.040 s. What is the acceleration of the ball?

50. The parallax of a heavenly body measured from two points diametrically opposite on equator of earth is 2.0 minute. If radius of earth is 6400 km,calculate distance of heavenly body.

Question 1 Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5Ω resistor, a 8Ω resistor, and a 12Ω resistor, and a plug key, all connected in series.

If Ankit travels a distance of πR along the circumference of a circle with radius R, his displacement will be:

In ecoR1 we get heterogenous fragments because it is not cutting sequence properlyRight?

A person driving a car with speed 72 km/h suddenly sees a boy crossing the road.If the distance moved by the car before the person applies brakes is 5m.Then reaction time of person is}(1) 0.5s(2) 0.10s(3) 10s(4) 0.25

If 9 g of H_2O is electrolysed completely with 50% current efficiency(1) 1 F of electricity will be needed(2) 3 F of electricity is needed(3) 5.6 L of O_2 at STP will be formed(4) 11.2 L of O_{} at STP will be formed

acceleration=d^2(x) divided by dt^2 or (dt)^2 that is square is only for t or both dt

If the radius of Earth shrinks by 1.5%(Mass remaining same), then the value of gravitational acceleration changes by?

An object of mass 16 kg moving with an acceleration of 3 metre second square. Calculate the applied force if the same force is applied on an object of mass 24 kg how much will be the acceleration?

A ball is moving over a horizontal smooth surface with a constant velocity. What type of forces are acting on the ball?

the nature of graph drawn between dispalcement in th second and time t of a uniformly accelerated motion is -1-a straight line with negative y axis2-a parabola

An object if mass m is floating in a liquid of density σ. If the object is of density ρ, then apparent weight of object in lquid i

a particle moves in x-y plane with a velocity v = 2yi + 4j. equation of the path followed by the particle is

A person is standing at a distance of 'd' m from a wall and clapping at a rate of 4 claps per second. The echo of his clap coincides with his clap and he hears the echo of two claps after he stops clapping. What is 'd'? (Assume velocity of sound to be 340 ms−1)

The acceleration of particle is given by a = –ω2x and given that x = Asinωt, the velocity of particle will be

A block of mass m1 is pulled along a horizontal frictionless surface by a rope of mass m2. If a force F is applied at the free end of the rope, the force exerted by the rope on the block is

Calculate acceleration due to gravity at a height of 2000 km above the Earth's surface. Mass of Earth = 6×1024 kg, radius of Earth = 6.4×106 m and (Gravitational constant, G =6.7×10−11Nm2kg−2)

If an alpha-particle and a proton are projected ina magnetic field, perpendicular to field withsame linear momentum then the ratio of radiiof alpha-particle with proton is

Mention two demerits of a simple barometer and state how they are removed in a Fortin barometer.

{ Two particles }A and }B start moving with velocities }}{20m/s and }30\sqrt2m/s along }x -axis and at an angle }}{45^° with }x -axis respectively in }xy -plane from origin. }}{ The relative velocity of }B w.rt. }A

The distance between two consecutive compressions or rarefactions is called

Question 7Name the unit in which the calorific value of a fuel is expressed.

What is the place called where vast amounts of oil is trapped?

What is the minimum pressure required to compress 460 dm3 of air at 2 bar to 230 dm3 at 30^° c

A person takes T1 second on the stationary escalator to cover same dis†an ce by same velocit. If person is at rest on the escalator then time taken by him to cover same dis†an ce i

For passengers flying at very high altitude, the sky appears dark. Why?

Two persons of masses m and 2m are s†an ding on a horizontal smooth surface. They are initially separated by a dis†an ce X_o. They slide on the horizontal surface as they pull a rope towards each other. they meet at what dis†an ce?

A feather is dropped on the moon from a height of 167 m. The acceleration due to gravity on the moon is 1.67 ms−2​. Determine the time taken by the feather to fall on the surface of the moon.

A ball hits a wall horizontally at 6.0 m s−1. It rebounds horizontally at 4.4 m s−1. The ball is in contact with the wall for 0.040 s. What is the acceleration of the ball?

A feather is dropped on the moon from a height of 167 m. The acceleration due to gravity on the moon is 1.67 ms−2. Determine the time taken by the feather to fall on the surface of the moon.