Questions from College Physics

Q: If the electric force on the drop is found to be 9

If the electric force on the drop is found to be 9.6 × 10−16 N and the potential difference between the plates is 480 V, what is the magnitude of the charge on the drop in terms of the elementary char...

Q: Find the orbital radius of a geostationary satellite without using the speed

Find the orbital radius of a geostationary satellite without using the speed found in Example 5.9. Start by writing an equation that relates the period, radius, and speed of the orbiting satellite. Th...

Q: A circuit has a resistor and an unknown component in series with

A circuit has a resistor and an unknown component in series with a 12 V (rms) sinusoidal ac source. The current in the circuit decreases by 25% when the frequency increases from 150 Hz to 250 Hz. What...

Q: Two blocks are connected by a light string passing over an ideal

Two blocks are connected by a light string passing over an ideal pulley. The block with mass m1 = 20.0 kg slides on a frictionless horizontal surface, while the block with mass m2 = 1.0 kg hangs verti...

Q: A graph is plotted of the vertical velocity component vy of an

A graph is plotted of the vertical velocity component vy of an elevator versus time. The y-axis points up. (a) How high is the elevator above the starting point (t = 0) after 20 s have elapsed? (b)...

Q: Refer to Problems 11–14. Find the final speed of

Refer to Problems 11–14. Find the final speed of the sliding crate if the incline is frictionless.

Q: A ball weighing 20.0 N is tied to a string

A ball weighing 20.0 N is tied to a string fixed to the ceiling. The string makes a 30.0° angle with the ceiling. Initially, the ball is held in place by a force / that is perpendicular...

Q: To increase the amount of light collected by the objective lens of

To increase the amount of light collected by the objective lens of a microscope, a technique known as oil immersion microscopy is used. To replace the air between the objective lens and the thin slip...

Q: A scientist working late at night in her low-temperature physics

A scientist working late at night in her low-temperature physics laboratory decides to have a cup of hot tea, but discovers the lab hot plate is broken. Not to be deterred, she puts about 8 oz of wate...

Q: A radar pulse has an average wavelength of 1.0 cm

A radar pulse has an average wavelength of 1.0 cm and lasts for 0.10 μs. (a) What is the average energy of the photons? (b) Approximately what is the least possible uncertainty in the energy of the...