Mechanics | Relativity Answers

a string of natural lenght L extends to a new lenght L under tensile force F. if hooke's law applies, the work done in stretching the spring is

a wire of cross-sectional area of 0.00006m^2 and lenght 50cm stretches by 0.2mm under a load of 3000N. calculate young's modulus for the wire.

an object of mass m is dropped from a height h.what is the kinetic energy when it touches the ground?"

if a force of 80N extends a spring of natural lenght 8m by 0.4m what will be the lenght of the spring when the force applied is 100N.

what is the magnitude o a net force to stop a 100kg object moving at 1 m/s in 5 seconds

state three advantages of studying physics?

a train moving at an essentially constant speed of 60 miles/hr moves eastward for 40 min,then in a direction 45 degree east of north for 20 min,and finally westward for 50 min. what is the average velocity of the train during this run?

two small copper blocks of different masses are submerged in a thank of water for 1 hour . the two blocks will have the same ? (1) heat capacity (2) temperature (3) internal energy . (2) only , (3)only , (1) and (2) only , (1) and (3) only

A tank 5m high is half filled with water and then is filled to the top with oil of density 0.85 g cm cube. What is the pressure at the bottom of the tank due to these liquid?

I want to explore what kinetic energy means. In this case, let's take two objects with about the same kinetic energy. A 94 lb (42.6 kg) cheetah running at 14 m/s (well within it's capability) and a rather powerful 23 gram bullet going at 602 m/s. What would happen if the cheetah runs straight into a 180 lb man? What would happen if the bullet hits a 180 lb man wearing a bullet proof vest? Let's assume the bullet doesn't exit, so all energy is transferred into the armor. What happens to the energy of the objects as they strike their targets? Use the physics knowledge you've gained so far in these three chapters to answer these questions.