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Subject: Science, asked on 3/2/18

Q.1. Select the proper choice from the given multiple choices :
(1) What is necessary for work to be done? Choose the correct statement.
(1) Action of force is necessary.
(2) Displacement is necessary.
(3) Displacement in the direction of force is necessary.
(A) Statement - 1
(B ) Statement - 2
(C) Statement - 3
(D) Statement 1 and 2
 

Subject: Science, asked on 2/2/18

An object of mass 1 kg is raised through height h its pe increases by 1 j find height h

Subject: Science, asked on 1/2/18

Pl answer
Q. A box of mass 2 kg is lifted diagonally from point A to point B as shown in the given figure. Given that the acceleration due to gravity is 10 m s-2, what is the gravitational potential energy gained by the box?


(A) 20 J
(B) 60 J
(C) 80 J
(D) 100 J

Subject: Science, asked on 31/1/18

A porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5 m above the ground. Calculate the work done by him on the luggage.

Subject: Science, asked on 29/1/18

what is answrr of question 40

Subject: Science, asked on 29/1/18

draw a graoh showing relation between momentum on y axis and kinetic energy on x axis with table and showing values

Subject: Science, asked on 28/1/18

find the ratio of kilowatt hour to Mega electron volt . pls fast

Subject: Science, asked on 26/1/18

The power of a motor pump is 2 Kw . How much water per minute the pump can raise to a height of 10 m . Take g = 10 m s -2

Subject: Science, asked on 26/1/18

A Water Falls is nearly 20 m high . 2000 tonnes of water falls from it in a minute . Calculate the equivalent power if all this energy can be utilized . Take g = 10 m s -2 

Subject: Science, asked on 23/1/18

A girl of mass 40 kg climbs 50 stairs of average height 20 cm each in 50 s. Find the power of the girl, (g = 10 ms–2)
(A) 50 W                  (B) 50 × 20 W                 (C) 80 W                   (D) 50 × 20 × 2 W

Subject: Science, asked on 23/1/18

Q ​A ball dropped from height 'h' reaches the ground in time T. What is its height from the ground at time T/2?
  1. h/28
  2. h/4
  3. h/2
  4. 3h/4

Subject: Science, asked on 23/1/18

Q44 A ball is dropped from height h and reaches ground in time T.What is the height from ground at time T/2?

Subject: Science, asked on 23/1/18

Q8

Subject: Science, asked on 20/1/18

it is said that if we push a book on a table some work is done but the angle between gravity and force applied is 90degree so how does work is done or not
 

Subject: Science, asked on 19/1/18

A boy of mass 50 kg runs up a staircase of 45 steps in 9 sec . If the height of each step of the staircase is 15cm then find power of the boy ?

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