Mechanics | Relativity Answers

A nail is fired into a block of wood at a velocity of 200 m/s. If the deceleration is 2 million m/s² how far does the nail travel before it comes to a stop?

The function f(x - vot) represent which of the following?

A. A stationary wave

B. A wave motion in forward direction

C. A wave motion in reverse direction

D. None of the above

What is length contraction.

A small block of mass m slides down a rough plane inclined at an angle of 45° to the horizontal.

If the block starts from rest, and has velocity v after travelling a distance x down the plane, find

an exact expression for the work done against friction, in terms of m, g, x and v.

A car of mass 2500 kg is driving up a hill inclined at an angle of 10° to the horizontal. If the

resistance to motion is 3.5 kN, and the speed is a constant 20 m/s, find the power exerted.

Explain central force and equation.

star A is 4 magnitudes brighter than star B .how does the apparent brightness of star A compare with that of star B?

The viscous drag force F, on a sphere of radius r, moving through a fluid with velocity v, can be expressed as F = 6PLrv, where L is the coefficient of viscosity of the fluid and P = pie(22/7). What are the base units of L?

A sphere of radius a, moving with velocity v, under streamline conditions in a viscous fluid experiences a retarding force F, given by F = kav, where k is a constant. What are the base units of k?

What are the base units of k so that the equation of velocity (v) = k x density