Mechanics | Relativity Answers

A bullet of mass 15g is fired from a riffle with a velocity 100m/s. If the mass of the riffle is it kg. What is the recoil velocity of the riffle?

Niagara Falls are 50n high. Calculate the potential energy of 0.1cubic meter of water at the top relative to the bottom. Density of water is 1000kgm^-3. g=10m/s^2

A stone of mass 59kg released from a height of 2m above the ground. If the stone falls freely to a height of 5m above the ground what is it's velocity

A train at 72km/h undergoes a uniform retardation of 2m/s when brakes are applied. Find the distance traveled from the place where the brakes were applied.

A gun of mass 10kg released a bullet of mass 20gm at a speed of 100m/s. Find the gun's speed of recoil

A boy whose mass is 40kg Finds that he can run up to 50 steps each of 15cm high in 5 seconds. How much power is required for the boy to run up the flight assuming g = 10m/s

A 1.0 kg mass attached to a spring with spring constant 25 N/m will oscillate with an angular frequency of what?

What is the angular velocity of a wheel that has a period of rotation of 2.5 seconds?

an observer moves past a stationary charged particle on the Earth's surface his instrument measures
1)only an electric field
2)only a magnetic field
3)both electric and magnetic field
4)neither electric field nor magnetic field due to the charged particle

how many times will the half life of an unstable particle increases as observed by an observer on the Earth if the particle moves with a velocity of 0.99C with respect to the observer
1)4 times
2)5 times
3)6 times
4)7 times