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An object of mass 1 kg was moving at a speed of $10{ms}^{-1}$. Constant force acts for 4s on the object and the speed of object was $2{ms}^{-1}$​ in the opposite direction after the applied force was removed. The force acting on the object was

An Atwood machine is set up like the figure which is given below.

If $m_1=4.5kg$ and $m_2=6.0kg$. What is the acceleration of the system when the masses are released? (Take the value of $g=10m{s}^{-2}$)

A person throws ball with a velocity $‘v^{\prime }$ from top of a building in vertically upward direction. The ball reaches the ground with a speed of ${}^{\prime }3v^{\prime }$. The height of the building is:

A steel ring of 3.000 inch inside
diameter at 20⁰C is to be heated and slipped over a brass shaft
measuring 3.002 inch in diameter at 20⁰ C. To what temperature
should the ring be heated? (α_steel=
1.1 ×10^-50C^-1)

A body covers first one-third of its journey with speed $u$, next one- third with speed $v$ and the last one-third with speed $w$. Calculate the average speed of the body over the entire journey.

A bar of iron is 10 cm at 20°C. At 19°C it will be (a of iron = 11 x 10^-6/°C)

Question 1
Find the focal length of a convex mirror whose radius of curvature is 32 cm.

• Which word in the box sounds like ‘high’?

1 A${}^{\circ }$ is equal to :

(a) 0.1 nm (b) ${10}^{-10}$ cm

(c) ${10}^{-8}$ m (d) ${10}^4\mu$

State two applications of an echo.

The binding energy per nucleon of $O^{16}$ is 7.97 MeV and that of $O^{17}$ is 7.75 MeV. Then, the energy (in MeV) required to remove a neutron from $O^{17}$ is

A force can :

Ram is standing 165 m behind Shyam. Shyam is standing 'd' meters away from a wall in the same line. Ram claps and Shyam hears the clap two times at an interval of 2 seconds. Find the value of 'd'. (Assume velocity of sound to be 330 m/s)

When a shot is fired from a gun, the gun gets recoiled. Explain.

In which of the following cases is work being done :

(a) A boy pushing a heavy rock

(b) A boy climbing up the stairs

(c) A coolie standing with a box on his head

(d) A girl moving on the road.

A train travels with a speed of 60km/h from station A to station B and then comes back from B to A with a speed of 80km/h find average speed. and average velocity

A car is travelling at 20m/s along a road. A child runs out into the road 50m ahead and the car driver steps on the brake pedal. What must be the car’s deceleration be if the car is to stop just before it reaches the child?

how will we find time in this question?

we have seen many stunts happening in movies from many bikes

if we accelerate and press brake together in a vehicle then the wheels of the vehicle starts rotating at the same place where the vehicle is standing. so in this case what can happen to the acceleration

thank you

siddhika

Fig. 2.38 shows the displacement of a body at different times.

(a) Calculate the velocity of the body as it moves for time interval (i) 0 to 5 s, (ii) 5 s to 7 s and (iii) 7 s to 9 s.

(b) Calculate the average velocity during the time interval 5 s to 9 s.

What is a free fall?

What type of wave is represented :

(a) by density - distance graph ?

(b) by displacement - distance graph ?

Find the recoil velocity of a gun having mass equal to 5 kg, if a bullet of 25 g acquires the velocity of $500\frac{m}{s}$ after firing from the gun.(in $\frac{m}{s}$)

How much momentum will a dumbbell of mass 10 kg transfer to the floor if it falls from a height of 80 cm (assume that the dumbbell stops after hitting the ground)? (Take g = 10 ms^-2 )

Two bodies of masses $3kg$ and $1kg$ have equal momentum. Ratio of their kinetic energy respectively is:

A current of $6A$ flows in the circuit shown.​ What is the voltage across $R_1$ ?​

State the kind of lever which always has the Mechanical Advantage(M.A) less than 1.

A body moving with a constant acceleration travels 3 m and 8 m respectively in 1 s and 2 s. Calculate-

1 initial velocity and

2 the acceleration of the body

A ball is projected vertically up from foot of a tower of height of 40 m/s . At the same instant another ball is dropped from top of tower. When and where do they meet each other . ( take g = 10 m/s^2)

Brakes are applied to a truck to produce an acceleration of –10m/s2​. If the truck takes 5s to stop after applying the brakes, the distance covered by the truck before coming to rest is 250 m.


i didn't even understand what are we supposed to find in this question.

A fast bowler takes longer star while bowling

Why weight decreases when we go beneath the surface of earth?

A boy runs for 10 minutes at a uniform speed of 18 km per hour. At what speed should he runs for the next 20 minutes so that the average speed becomes 12 km per hour?

During an accelerated motion of a particle ,the average

A) velocity of the particle is always less than its final velocity.

B) velocity of the particle is always greater than its final velocity.

C) velocity of the particle is half its final velocity

D) velocity of the particle may be zero also

Select the above option and explain

Force of viscosity acting on a spherical body of radius r moving with velocity v through a fluid of viscosity η is given by

If the force acting on the body is zero. Its momentum is: