Questions from College Physics

Q: What are the SI units of mass density and number density?

What are the SI units of mass density and number density? If two different gases have the same number density, do they have the same mass density?

Q: A parallel plate capacitor is constructed from two square conducting plates of

A parallel plate capacitor is constructed from two square conducting plates of length L = 0.10 m on a side. There is air between the plates, which are separated by a distance d = 89 µm. T...

Q: (a) Is the power detected at θ = 0 a

(a) Is the power detected at θ = 0 a maximum or a minimum? Explain, (b) For what values of d (in terms of λ) would the power be minimum at θ = 90°?

Q: An isotope of sodium, / , decays by β

An isotope of sodium, / , decays by β+ emission. Estimate the maximum possible kinetic energy of the positron by assuming that the kinetic energy of the daughter nucleus and the total energy of the...

Q: You are watching a television show about Navy pilots. The narrator

You are watching a television show about Navy pilots. The narrator says that when a Navy jet takes off, it accelerates because the engines are at full throttle and because there is a catapult that pro...

Q: A charge of +2.0 mC is located at x

A charge of +2.0 mC is located at x = 0, y = 0 and a charge of −4.0 mC is located at x = 0, y = 3.0 m. What is the electric potential due to these charges at a point with coordinates x = 4.0 m, y = 0?...

Q: A tetherball set has a ball with mass 0.411 kg

A tetherball set has a ball with mass 0.411 kg and a nylon string with diameter 2.50 mm, Young's modulus 4.00 GPa, and density 1150 kg/m3. The nylon string has a length of 2.200 m when the ball is at...

Q: The main magnet in an MRI machine is a superconducting solenoid 1

The main magnet in an MRI machine is a superconducting solenoid 1.8 m long and 70 cm in diameter. During normal operation, the current through the windings is 120 A and the magnetic field magnitude is...

Q: Why do roadside signs warn that bridges ice before roadways? Explain

Why do roadside signs warn that bridges ice before roadways? Explain.

Q: Multiple-Choice Questions 7–12 refer to a situation in

Multiple-Choice Questions 7–12 refer to a situation in which a golf ball is projected straight upward in the +y-direction. Ignore air resistance. The answer choices are found in the...