Mechanics | Relativity Answers

5. The car travelling 88km/h is 200m behind a truck travelling at 65km/h. how long it will
take the car to reach the truck.

A rubber ball was launched at a velocity of +5 m/s at an angle where its range is at a maximum. A target is located exactly 2.0 meters from where the ball was launched.

a) What is the velocity of the ball as soon as it hits the ground?

b) Will the rubber ball hit the target? If no, at what angle should the ball be launched for it to hit the target?

A projectile was launched from the top of a 25m high building at a velocity of +35m/s and at an angle of 28 degrees with the horizontal.

a)How far is the projectile from the building horizontally by the time it reaches its maximum height?

b) If the projectile lands on a hill 3 meters high from the ground, how long was the projectile airborne?

c) If the projectile lands on a hill 3 meters high from the ground,
how far is the hill from the building?

A spaceman jumps from an airplane. After he had fallen 35 m, then his parachute opens. Now he falls with retardation of 1.8 m/s² and reaches the earth with a velocity of 2.7 m/s. What was the height of the airplane?

A cue ball with mass 170 g hits the stationary number 8 ball, which has mass 160 g. The cue ball and the 8 ball move with a speed of 0.2 m/s and 0.3 m/s respectively after the collision. What was the speed of the cue ball before the collision?

A ball of mass 4 kg moves with a speed of 6 m/s. a) What is its momentum? b) What impulse is needed to stop it? c) What average force is needed to stop it in 3 s?

21. If a wave travels 20 meters in 2 sec what is the speed of the wave?

an aeroplane is flying at an altitude of 3000 metres. Two skydivers A and B jump from the plane. A weighs 75 KGS and B weighs 85 kgs. A jumps out without parachute and B jumps with parachute. who will reach the ground faster? that is lesser amount of time why ?explain your answer

Prove the relation E^2-P^2C^2=m•^2C^4 where P is the momentum.

Saturn has a mass of 1.57x1027kg and its moon Titan has an orbital period of 15.945 Earth-days. What is the radius of Titan’s orbit in meters, assuming a circular orbit? (note: it's not, but it's eccentricity is only about 0.03)