61. A force of 20 N displaces an object through 2 m and does a work of 20 J. The angle between the force and displacement is:
62. The momentum of a moving object depends on some factors. Which of the following statements is most appropriate?
63. Mohan, having a mass of 40 kg, runs up a staircase of 50 steps in 10s. If the height of each step is 15 cm, then what is his power?
(Take g = 10m/s2)
(Take g = 10m/s2)
64. The work done by the force is positive when-
65. If the momentum of an object is tripled, its kinetic energy-
66. All forces have:
67. What will be the average power required to lift an object of 80 kg to a height of 40 m in 50s? (g=10m/s2)
68. Consider the following statements.
A 4-wheel vehicle moving in a sharp circular path at high speed will
1. Overturn about its outer wheels
2. Overturn about its inner wheels
3. Skid outwards
4. Skid inwards
Which of these statements are correct?
A 4-wheel vehicle moving in a sharp circular path at high speed will
1. Overturn about its outer wheels
2. Overturn about its inner wheels
3. Skid outwards
4. Skid inwards
Which of these statements are correct?
69. What is the SI unit of energy?
70. Which of the following devices converts chemical energy into electrical energy?
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