Mechanics | Relativity Answers

How much net force acts on a 120 kg cart that is experiencing an acceleration of 7.5 m/s^2?

At t = 0, a particle leaves the origin with a velocity of 12 m/s in the positive x
direction and moves in the xy plane with a constant acceleration of
(2.0ˆi + 4.0ˆj ) m/s2. At the instant the y coordinate of the particle is 18 m, what is
the x coordinate of the particle?

a 3 kg cart starting from rest on a frictionless surface is pulled by a horizontal mass-less rope with a constant force of 6 N. What is the acceleration of the cart, and how fast is it moving at the end of two seconds?

A cooking pan whose inner diameter is 20 cm is filled with water and covered with a 4 kg lid. If the local atmospheric pressure is 101 kPa, determine the temperature at which the water will start boiling when it is heated.

A 9 kg car travels in a flat circle. At a certain instant the velocity of the car is 16 m/s West and the total acceleration of the car is 3 m/s2 at 54◦ North of West.
What is its radius? Answer in units of km

with what speed must a ball be thrown vertically upward in order to rise to a height of 50 ft ? how long will it be in the air

1. A basketball player achieves a hang time of
1.11 s in dunking the ball.
What vertical height will he attain? The
acceleration of gravity is 9.8 m/s^2.
Answer in units of m

2. A bullet is fired straight up from a gun with a
muzzle velocity of 263 m/s.
Neglecting air resistance, what will be its
displacement after 7.8 s? The acceleration of
gravity is 9.8 m/s^2.
Answer in units of m

3. A rock is thrown downward from an unknown
height above the ground with an initial speed
of 30 m/s. It strikes the ground 8.7 s later.
Determine the initial height of the rock
above the ground. The acceleration of gravity
is 9.8 m/s^2
Answer in units of m

4. A ball is thrown straight up and passes point
B (at a height of 53.4 m above its starting
point O) in 4.6 s. What was its initial speed?
The acceleration of gravity is 9.8 m/s^2.
Answer in units of m/s

A sound wave has a wavelength of 55 cm and a speed of 25275 m/s. What is the frequency of the wave? What is its period?

A radio wave has a speed of 3 × 108 m/s and a frequency of 1007Hz. What is the wavelength?

A wave has a frequency of 650 Hz and a wavelength of 1.20 m. What is the speed of the wave?