Mechanics | Relativity Answers

a book falls from a shelf 160cm above the floor .Find the speed with which the book strikes the floor.

After 10 s an object is displaced 40 m [W] due to a uniform acceleration of - 5 m/s squared. What is the object's final velocity?

A cannon mounted on a pirate ship fires a cannonball at 125 m/s horizontally, at a height of 17.5 m above the ocean surface. Ignore air resistance. (a) How much time elapses until it splashes into the water? (b) How far from the ship does it land?

(a)

What is the period of the wave motion for a wave with a frequency of 0.36 kHz

A cheerleader lifts his 38.6 kg partner straight up off the ground a distance of 0.596 m before releasing her. 2
The acceleration of gravity is 9.8 m/s .
If he does this 28 times, how much work has he done?

Shawn and his bike have a total mass of 47.5 kg. Shawn rides his bike 0.64 km in 12.9 min at a constant velocity.
The acceleration of gravity is 9.8 m/s2 . What is Shawn’s kinetic energy?
Answerinunitsof J

A 2.3 kg otter starts from rest at the top of a
muddy incline 90.5 cm long and slides down
to the bottom in 0.50 s.
What net external force acts on the otter
along the incline?
Answer in units of N

A boat moves through the water with two forces acting on it. One is a 2.72×10 3 N forward push by the motor, and the other is a 1.76×10 3 N resistive force due to the water. What is the acceleration of the 1384.9 kg boat? Answer in units of m/s 2 If it starts from rest, how far will it move in 17.3 s? Answer in units of m

if a car moves with some acceleration then in which direction the friction will act on a box lying on the floor of the car?

An object that has a weight of 0.04kg,moves in a circle with a 5rads-1 angular velocity .Find the speed ,kinetic energy and the periodic time of the object.