NEET Physics: Questions 855 - 857 of 2099
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2099 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.
Rs. 550.00 or
Question number: 855
A block of mass 5 kg is placed on the floor. The coefficient of static friction is 0.2. A force F of 2.5 N is applied on the block, as shown. Calculate the force of friction between the block and the floor, (g = 9.8 ms -2)
Question number: 856
A bus of mass 2000 kg has an engine which produces a constant power of 50 kW. If the resistance to motion, assumed constant is 2000 N. The maximum speed at which the bus can travel on level road and the acceleration when it is travelling at 15 m/s, will respectively be –
10 m/s, 5m/s 2
25 m/s, 0.6666 m/s 2
1.0 m/s, 50 m/s 2
50 m/s, 1.0 m/s 2
Question number: 857
Which of the following statements is false for collisions-
(1) Momentum is conserved in elastic collisions but not in inelastic collisions.
(2) Total-kinetic energy is conserved in elastic collisions but momentum is not conserved.
(3) Total kinetic energy and momentum both are conserved in all types of collisions
(4) Total kinetic energy is not conserved in inelastic collisions but momentum is conserved
Select the correct answers and mark it according to the following codes
1 and 3 are correct
1 and 2 are correct
1, 2 and 3 are correct
2 and 4 are correct