Mechanics | Relativity Answers

A 12 kg mass was projected with

an initial kinetic energy of 450J along

the surface of a rough plane inclined

at 30° above the horizontal. If the

mass comes to rest after traveling 3.5m along the plane, calculate the

coefficient of kinetic friction between the mass and the plane.

A force which depends on x as

F(x) = 3x^2 - 4x moves a particle from

x1= 2.0 m to x2= 5.0 m. Calculate the

work done by the force.

Is interference a property of some types of waves only or is it a property of all types of waves?

When a wave source moves towards a receiver, does the receiver encounter an increase in wave frequency, wave speed or both?

Suppose a piano tuner hears 3 beats per second when listening to the combined sound from her tuning fork and the piano note being tuned. After slightly tightening the string, she hears 2 beats per second. Should she loosen the string or should she further tighten the string? Why?

Three students observe a toy car rolling across a level floor until it slows to a stop. After the observation, they

make these statements:

Max:

“Energy is conserved, but friction turned it into heat, warming the floor and wheels.”

Chris:

“But it stops. Energy is not conserved. The car’s kinetic energy disappeared.”

Sam:

“But energy can’t just disappear. It must have become potential energy.”

Which student was correct?

A car of mass 9500kg is moving up a cliff from rest with a velocity of v=(3t^2 + 2t)î +5j m/s for 1 minute.If the slope of the cliff is 1,what distance was covered by the car in 1minute

Calculate the work done in displacing a body with a force,f=(30î + 40j)N through S=(2tî-4tj)m between t1=2 second and t2=5 seconds

What is angular frequency.

Write the note on spring constant