|
Figure shows a conveyor belt transporting a package to a raised platform. The belt is driven by a motor
|
|
1
|
2845
|
March 21, 2018
|
|
A car of mass 900 kg is travelling at a steady speed of 30 m/s against a resistive force of 2000 N, as illustrated in figure
|
|
1
|
5244
|
March 21, 2018
|
|
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it
|
|
1
|
1331
|
March 21, 2018
|
|
A light and a heavy object have the same momentum, find out the ratio of their kinetic energies. Which one has a larger kinetic energy
|
|
1
|
699
|
March 21, 2018
|
|
Show that when a body is dropped from a certain height, the sum of its kinetic energy at any instant during its fall is constant
|
|
1
|
3358
|
March 21, 2018
|
|
Briefly describing the gravitational potential energy
|
|
1
|
677
|
March 21, 2018
|
|
A body thrown at a certain angle to the ground moves in a curved path and falls back to the ground
|
|
1
|
510
|
March 21, 2018
|
|
Two workmen are employed on a building project, as shown in figure
|
|
1
|
980
|
March 21, 2018
|
|
Figure shows, in order, five stages of an athlete successfully performing a pole-vault
|
|
1
|
896
|
March 21, 2018
|
|
Give one example of each of the following: Small mass but high kinetic energy
|
|
1
|
1603
|
March 21, 2018
|
|
The velocity of a body moving in a straight line is increased by applying a constant force
|
|
1
|
2807
|
March 21, 2018
|
|
Avinash can run at a speed of 8 ms-1 against the frictional force of 10 N, and Kapil can move at a speed of 3 ms-1 against the frictional force of 25 N. Who is more powerful and why?
|
|
1
|
1052
|
March 21, 2018
|
|
A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?
|
|
1
|
1938
|
March 21, 2018
|
|
Derive an expression for kinetic energy of an object
|
|
1
|
8636
|
March 21, 2018
|
|
What types of energy transformation takes place in the following:
|
|
1
|
2668
|
March 21, 2018
|
|
Give three examples when the object is not displaced in spite of a force acting on it
|
|
1
|
684
|
March 21, 2018
|
|
Observe the diagrams I and II carefully
|
|
1
|
578
|
March 21, 2018
|
|
What is power? How do you differentiate kilowatt from kilowatt hour?
|
|
1
|
506
|
March 21, 2018
|
|
Calculate the work done against the gravity
|
|
1
|
357
|
March 21, 2018
|
|
What is the relationship between the commercial unit and SI unit of energy?
|
|
1
|
1210
|
March 21, 2018
|
|
What is the commercial unit of energy?
|
|
1
|
325
|
March 21, 2018
|
|
What kind of energy transformation takes place when a body is dropped from a certain height?
|
|
1
|
827
|
March 21, 2018
|
|
Give one example each of potential energy (i) due to position (ii) due to shape
|
|
1
|
440
|
March 21, 2018
|
|
Give any two uses of kinetic energy
|
|
1
|
1572
|
March 21, 2018
|
|
What is energy? What is unit of energy?
|
|
1
|
303
|
March 21, 2018
|
|
On what factors the work done on a body depends?
|
|
1
|
5846
|
March 21, 2018
|
|
Give two examples from everyday life where work is done
|
|
1
|
674
|
March 21, 2018
|
