Other Physics Answers

In a billiard table, a ball of mass weighing 250 g rolls with a velocity of

2.5 m/s and rebounds back at 2.5 m/s. Calculate the following:

a. change in momentum

b. impulse experienced by the ball

Let the angle be the angle that the vector makes with

the measured counterclockwise from that axis. Find

the angle for a vector that has the following components: 

(a)Ax=-6.5m, Ay=1.9m

1. A merry-go-round rotates at the rate of 0.24 rev/s with an 71 kg man standing at a point 2.7 m from the axis of rotation. What is the new angular speed when the man walks to a point 1 m from the center? Consider the merry-go-round is a solid 79 kg cylinder of radius of 2.7 m
2. What is the change in kinetic energy due to this movement?

Two pans of a balance are 25.7 cm apart.

The fulcrum of the balance has been shifted

0.893 cm away from the center by a dishonest

shopkeeper.

By what percentage is the true weight of the

goods being marked up by the shopkeeper?

Assume the balance has negligible mass.

a beam of electrons travels at right angles of a speed uniform magnetic field in a force of 6.4x10^-4 N. how much current does the beam carry over a 145cm long wire? 9.0x10^-6 m/s througha 4.0x10^-2 T

An observer at rest near the source of the sound with f = 784 Hz. Another source of sound with 775 Hz is moving toward the observer at 2 m/s. If the v of the sound waves in air is 340 m/s, what is the beat f heard by the observer?

Compute

a. What is the acceleration of a car that goes from 20 to 30 mi h

in 15 s?

b. At the same acceleration, how long will it take the car to go

from 30 to 36 mi/h?

a stone is thrown upwards with an initial velocity of 25m/s at an angle of 30 degree to the ground
how long will it take betweeeen when the stone was thrown and when it comes back to the ground?

A towing van tows a car of mass of 1500kg along a level road and accelerate at 0.8m/ what is the tension in the towing van

 A spelunker is surveying a cave. He follows a passage that goes 210m straight West, then 180m in a direction 350 East of North, then 110m at 800 South of East. After a fourth unmeasured displacement, he finds himself back where he started. Determine the fourth displacement (magnitude and direction).