Questions from College Physics

Q: If you leave the refrigerator door open and the refrigerator runs continuously

If you leave the refrigerator door open and the refrigerator runs continuously, does the kitchen get colder or warmer? Explain.

Q: A block is released from rest and slides down an incline.

A block is released from rest and slides down an incline. The coefficient of sliding friction is 0.38, and the angle of inclination is 60.0°. (a) Use energy considerations to find how fast the block...

Q: Table 12.2 lists 120 dB as the intensity level at

Table 12.2 lists 120 dB as the intensity level at the threshold of pain for humans. (a) Show that the corresponding pressure amplitude is 29 Pa. (b) What is this pressure amplitude as a fraction of...

Q: The graph shows the force exerted on an object versus the position

The graph shows the force exerted on an object versus the position of that object along the x-axis. The force has no components other than along the x-axis. What is the work done by the force on the o...

Q: The Milky Way galaxy rotates about its center with a period of

The Milky Way galaxy rotates about its center with a period of about 200 million yr. The Sun is 2 × 1020 m from the center of the galaxy. (a) What is the Sun’s radial acceleration? (b) What is the ne...

Q: When snorkeling, you wear goggles in order to see clearly.

When snorkeling, you wear goggles in order to see clearly. Why is your vision blurry without the goggles? A nearsighted person notices that he is able to see more clearly when he is underwater (withou...

Q: Most heat pumps incorporate an auxiliary electric heater. For relatively mild

Most heat pumps incorporate an auxiliary electric heater. For relatively mild outdoor temperatures, the electric heater is not used. However, if the outdoor temperature gets very low, the auxiliary he...

Q: A block of mass 2.00 kg slides eastward along a

A block of mass 2.00 kg slides eastward along a frictionless surface with a speed of 2.70 m/s. A chunk of clay with a mass of 1.50 kg slides southward on the same surface with a speed of 3.20 m/s. The...

Q: A proton is initially at rest and moves through three different regions

A proton is initially at rest and moves through three different regions as shown in the figure. In region 1, the proton accelerates across a potential difference of 3330 V. In region 2, there is a mag...

Q: In everyday experience, visible light seems to travel in straight lines

In everyday experience, visible light seems to travel in straight lines whereas radio waves do not. Explain.