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1]When lift is moving upwardsWeight = m(g + a)= 60 kg × (10 + 2) m/s²= 720 N

[2]When lift is moving downwardsWeight = m(g - a)= 60 kg × (10 - 2) m/s²= 480 N

AS IT MOVE DOWNARDS SO THE Tension in a string is equal to reaction forcetherefore reaction = m(g-a) = 60(9.8-1) = 528N

thanksbut till the question is not completed

Power=60 WTime=6 hr=6×3600 secs=21600 secs

Energy consumed per day=60×21600 Joules=1.296 MJ

The electroscope can also be charged without touching it to a charged object, by electrostatic induction. If a charged object is brought near the electroscope terminal, the leaves also diverge, because the electric field of the objectcausescharges in the electroscope rod to separate the leaves.

Uniform circular motioncan be described as themotionof an object in acircleat a constant speed. As an object moves in acircle, it is constantly changing its direction. At all instances, the object is moving tangent to thecircle.

Initial momentum of the system is 0 as , no one is moving

Let the boy jumps with velocity 5 w.r.t ground and board moves with -V with respect to groud in opposite direction

now, on conserving linear momentum

0 = 25*(5) + 10*(-V)

=> 10v = 25*5=> 10v = 25*(5)=> V = 12.5 m/s

and V relative of boy w.r.t board = 5-(-12.5) = 17.5 m/s

thx

Power of the bulb,P=60W=60/1000 KW=0.06 KW

time, t = 6 h

energy consumed by bulb per day=P×t=0.06 KW× 6 h =0.36 KWh =0.36 units

Power=60 WTime=6 hr=6×3600 secs=21600 secs

Energy consumed per day=60×21600 Joules=1.296 MJ

don't know answer........

98 is the correct answer

Rate of change of momentum = force = weight of the object = 98 Newtons.There is only one force acting that is gravity.

We can find also this way:v = v cos60i + (v sin60 – g t) j

p = mv = mvcos60 i + m (v sin60 – gt) j

dp/dt = F =m a = m g j

= -10 * 9.8 j N

= 98j Newtons vertically downwards.

Snell's law (also known as Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.

Newton's Law of Cooling statesthat the rate of change of the temperature of an object is proportional to the difference between its own temperature and the ambient temperature (i.e. the temperature of its surroundings).

h=1/2g(t1+t2)^2

2h/g=(t1+t2)^2------(1)

h/2=1/2gt1^2

t1^2=h/g---------(2)

From 1st and 2nd

t1^2=(t1+t2)^2/2

t1=(t1+t2)/1.41

1.41t1=t1+t2

t1=t2/.41

So

t1=2.414t2

Hansika you look intelligent, because you solved an uneasy question. Can you answer 26 no. question and also that starts from 'A bullet. .

Yes it does obey Newton's laws of motion as it deals with force .

AVERAGE SPEED = (50+60)/2 = 110/2 = 55 Km/ph

AV =(50+60)/2=110/2=55Km/Ph

it will contain 2.00 mol of hydrogen nuclei/electron/proton

1 mol electron/proton has 1farad charge=96500coulomb=9.65×10e-2 MCoulomb

hence 2.00 mol will have 0.193MCoulomb charge

Definition of development: The systematic use of scientific and technical knowledge to meet specific objectives or requirements.

Let the total distance be 2x therefore the car travel s first half distance I.e. x with 30 km/hr time = x/30 hrthe car travel s second half of the distance I.e x with 50km/hrtime = x/50 hrnow,average speed= total distance travelled/total time taken= 2x/x/30+ x/60= 2x/6x+3x/180= 2x/9x*180= 40 km/hr

C is the right answer

C is the right answer

c is the right answer.

c is the eight answer

c) is the right answer of the following

C is the right answer

Let the velocity of swimmer = V(s)

Let the velocity of current = V(w)

width of river = 320 m

time taken to cover the river = 4 minute

the swimmer swims in -ve direction so that the resultant velocity would be perpendicular to the river velocity .

so the resultant velocity or V(sw) has two components

V(sw) sinФ in the perpendicular

V(sw) cosФ in the base direction

As we know V(sw) sinФ = V(w)

Also V(sw) cosФ = V(s)

And

t = 320 / V(sw)cosФ

4 = 320 / V(sw)cosФ

In the question it is given that

the 5/3V(w) = V(sw)

So ,

we can write

4 = 320 / (5/3) V(w) x 4/ 5

V(w) = 320 x 3 / 4 x 4

V(w) = 20 x 3

V(w) = 60 m/min

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Li has highest reducing property.

Biodiversity effected by the excessive use of fossil fuels because fossil fuel are limited so when we use it its amount decreases along with its use. also after some years it exhausts

Biodiversity loss is accelerating, and the risks to biodiversity are increasing .We in the midst of a global biodiversity crisisThe biggest threats to biodiversity are Human activities.These act across a range of scales.Even local biodiversity lose can have knock-on large scale impacts on ecosystem function and productivity.

wrong ans

Power is the ability or capacity to do something or act in a particular way.

From the figure , The initial velocity is 20i

and the final velocity is 20jso the change will be ∆v = 20j-20i

and |∆V| =√20²+20² = 20√2

Electrical energy=Power×time =60×75 =4500

option 4

(4)angle of contact between the surface and the liquid