Mechanics | Relativity Answers

A work of 2J is required to elongate a spring of mass 16g with a spring constant k=2N/m. What is the elongation?

A ball of mass 1g is subjected for millisec to a force of 10^-3N. How much does the velocity change?

a toy car of mass 10kg is driving around a circle of radius 50cm with a centripetal acceleartion of 8 m/sec^2. What is the speed of the car?

A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water while suspended from a harness. Her apparent weight is now What is her density?

2 blocks of mass m and M are connected by a string of constant k. the blocks are kept on a constant horizontal plane and are at rest. the spring is unstretched when a constant force F starts acting on the block of mass M ti pull it. Find the maximum extension of the spring

Could the net force ever be zero? Explain.

What would be the length of the day if the earth rotated so fast that object at equator had no weight?take the radius of the earth as 6400 KM.

a projectile is launched horizontally with a speed of 86.7 m/s. if the projectile is launched 1.6 m above the floor, how long will it take the projectile to hit the floor

A weightless rod of length 2l carries two equal masses 'm', one tied at lower end A and the other at the middle of the rod at B. The rod can rotates in vertical plane about a fixed axis passing though C. The rod is released from rest in horizontal position. The speed of mass B at the instant , rod become vertical is
(1)square(3gl/5)
(2)square(4gl/5)
(3)square(6gl/5)
(4)square(7gl/5)

You pluck a G string on a guitar which should be 196hz, and you wish to tune this string. A tuning fork is known to vibrate at 196hz is simultaneously struck, and in a time period of 10s you count 17 beats. Determine the actual frequency of the guitar string.