Question

4. Numericals :[5 mark each] a) A force of 1200 N acts on a surface of areas 10cm> normally. What would be the thrust and pressure on the surface?
b) An object of mass M and velocity V has kinetic energy 200 J. Find the new kinetic energy if the mass of the object becomes double and velocity still remains the same?
c) A boy opens a nut by applying a force of 200 N using a wrench of length 30 cm. If he wants to open it by a force of 50 N, what should be the length of wrench? d) A crane pulls up a car weighing 500 kg to a vertical height of
4 m. Calculate the work done by the crane. g= 10 m/s.​

Answer 1

Explanation:

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