Mechanics | Relativity Answers

. If two particles have equal momenta, are their kinetic ener- gies equal? (a) yes, always (b) no, never (c) no, except when their masses are equal (d) no, except when their speeds are the same (e) yes, as long as they move along parallel lines.

(a) If two automobiles collide, they usually do not stick together. Does this mean the collision is elastic? (b) Explain why a head-on collision is likely to be more dangerous than other types of collisions.

Artificial rotating at an altitude of h = 300km above the Earth's surface
Find the throttle acceleration in the center of the constellation.

The stones tied on top are evenly rotating in a vertical plane. Upholstery
the difference between the maximum and minimum values of the pulling force of the wire
If ∆T = 10N
Find the mass of the stone m.

Pushing one body toward the inclined plane, which formed the angle α, at speed v. The body
Having reached its climax, it returned to its original position. Body and inclined plane
coefficient of friction between k. When the body returns to its original position
at what speed? What time will it take?

A mass breaks suddenly into two parts, masses M and m, with speeds V and v respectively and carrying a total kinetic energy K. If (M/m) = R = 4.2 what fractions of KK does each of the masses carry? (Think about significant figures.)

if a car increases its velocity from 0m/s to 10m/s in 5 seconds,what is the acceleration of the car.

A carriage of mass 150 kg moving with a velocity of 1.2 m/s collides with a 300 kg carriage that is stationary on track. The second carriage moves at 0.8 m/s after the collision. Calculate the velocity of the first carriage after the collision.

Calculate the work done by a 14N force at 40° to the horizontal to move a 505g box a horizontal distance of 40m across a rough floor at a constant speed of 0.5m/s.

A stationary ball, with a mass of 0.5 kg, is struck by an identical ball moving at
6.0ms .
1
After the collision, the second ball moves 30° to the left of its original
direction. The stationary ball moves 60° to the right of the moving ball’s original
direction. What is the velocity of each ball after the collision?