Mechanics | Relativity Answers

a block A weight of 320N resting on a rough horrizontal floor supports a block B 160 N. The two blcok connecting to a string passing arround a smooth pulley. Determine the horizontal force P that has to be applied on block A so as to just move it towards right.take miu=0.25 at all contact surface and also determine the tension T in the string respectively.

An object, s velocity is 4m/s and the mass is 60 kg. What is the object, s kinetic energy.

A car accelerates from rest at a constant rate α for some time after which it decelerates at a constant rateβ and comes to rest. if total time elasped is t, then maximum velocity acquired by car will be

A rocket moves straight upward, starting from rest with acceleration of 429.4m/s. It runs out of fuel at the end of 4.0s and continues to coast upward, reaching a maximum height before falling back to Earth.
a) find the rocket's velocity and position at the end of 4.00s. [v=118m/s, y=235m]
b) find the maximum height the rocket reaches. [945m]
c) find the velocity the instant before the rocket crashes on the ground [-136m/s]
[use a= -g= -9.80m/s square]

the fastest propeller - driven aircraft is the Russian TU- 95/142, which can reach a maximum speed of 925km/h for this speed, calculate the planes resultant displacement if it travels due east for 1.50h, then turns N45 degree East and travels for 2.0h (d= 1.32 × 10 rise to power of six meter, Φ= N3.5 degree East)

In 1978, Geoff Capes of the United Kingdom won a competition for throwing 5 Ib bricks; he threw one brick a distance of 44.0m. Suppose the brick left Capes hand at an angle of 45.0 degree with respect to the horizontal.
a) what was the initial speed for the brick? (20.8 m/s)
b) what was the maximum height reached by the brick? (11.0m)

An athlete threw a basketball a distance of 27.5m to score and win the game. If the shot was made at a 50.0 degree angle above the horizontal, what was the initial speed of the ball? (16.6m/s)

A block weight 200N rest on a rough horizontal table. When the block just begins to slide the pulling force is found to be 40N. What is the coefficient of friction between the two surfaces

A body of mass 2kg is placed on a rough inclined plane whose angle of inclination is 30 degree. Find the resultant force acting down on the slope and acceleration if a frictional force of 5N acts between the body and the inclined surface.

A body of mass 6N rest on a plane inclined at 30 degree to horizontal.
a) what force keeps it from sliding down on the plane?
b) what is the coefficient of the friction?