# Kassy

1. ## physic

How fast (in meters/second) is an object moving on the earth, if its speed is specified as Mach 0.2 ?
2. ## physics

A tuning fork is set into vibration above a vertical open tube filled with water. The water level is allowed to drop slowly. As it does so, the air in the tube above the water level is heard to resonate with the tuning fork when the distance from the tube
3. ## physic

At T= 20 degrees C, how long (in meters) must an open organ pipe be if it is to have a fundamental frequency of 240.0 Hz?
4. ## physics

An organ pipe is 81 cm long and at a temperature of 20 degrees C. What is the fundamental (in Hertz) if the pipe is closed at one end?
5. ## physic

The string on a violin has a fundamental frequency of 150.0 Hz. The length of the vibrating portion is 36 cm and has a mass of 0.51 g. Under what tension (in newtons) must the string be placed?

1. ## physics

The string on a violin has a fundamental frequency of 150.0 Hz. The length of the vibrating portion is 36 cm and has a mass of 0.51 g. Under what tension (in newtons) must the string be placed?
2. ## physics

So I got a little confused. I got stuck on this equation at: 1/2kx^2=1/2 m1* (m2/m1*v^2)+1/2 m2v2^2 Then: kx^2=m2*v2+1/2(m2v2^2) Then what?
3. ## physics

A 550 N crate rests on the floor. How much work in joules is required to move it at constant speed 7.0 m along the floor, against a friction force of 150 N?

Was it D ?