Questions from College Physics

Q: A child swinging on a swing set hears the sound of a

A child swinging on a swing set hears the sound of a whistle that is being blown directly in front of her. At the bottom of her swing when she is moving toward the whistle, she hears a higher pitch, a...

Q: What fraction of the air molecules in a house must be pushed

What fraction of the air molecules in a house must be pushed outside while the furnace raises the inside temperature from 16.0°C to 20.0°C? The pressure does not change since the house is not airtight...

Q: A 30.0 cm long string has a mass of 0

A 30.0 cm long string has a mass of 0.230 g and is vibrating at its third-lowest natural frequency f3. The tension in the string is 7.00 N. (a) What is f3? (b) What are the frequency and wavelength of...

Q: A patient with emphysema is breathing pure O2 through a face mask

A patient with emphysema is breathing pure O2 through a face mask. The cylinder of O2 contains 0.0170 m3 of O2 gas at a pressure of 15.2 MPa. (a) What volume would the oxygen occupy at atmospheric pr...

Q: The A string on a guitar has length 64.0 cm

The A string on a guitar has length 64.0 cm and fundamental frequency 110.0 Hz. The string's tension is 133 N. It is vibrating in its fundamental standing wave mode with a maximum displacement from eq...

Q: Incandescent lightbulbs are filled with an inert gas to lengthen the filament

Incandescent lightbulbs are filled with an inert gas to lengthen the filament life. With the current off (at T = 20.0°C), the gas inside a lightbulb has a pressure of 115 kPa. When the bulb is burning...

Q: A ball of mass 0.10 kg moving with speed 2

A ball of mass 0.10 kg moving with speed 2.0 m/s hits a wall and bounces back with speed 1.0 m/s in the opposite direction. What is the change in the ball’s kinetic energy?

Q: What is the pressure on a fish 10 m under the ocean

What is the pressure on a fish 10 m under the ocean surface?

Q: A piano “string” is steel wire with radius 0.

A piano “string” is steel wire with radius 0.50 mm and length 1.2 m. It is under 800 N of tension. (a) What is the speed of transverse waves on the string? (b) What is the fundamental frequency for...

Q: The coefficient of static friction between a block and a horizontal floor

The coefficient of static friction between a block and a horizontal floor is 0.35, while the coefficient of kinetic friction is 0.22. The mass of the block is 4.6 kg, and it is initially at rest. (a)...