1. Intro to Physics Units

Which of the following best describes a seismograph?

Which of the following is the correct SI unit for the spring constant $k$ in Hooke's Law?

The shadow cast by a simple stick or obelisk allowed ancient people to:

Which of the following best describes the law of superposition as it applies to physics?

Show that the product RC has units of s.

As you pilot your space utility vehicle at a constant speed toward the moon, a race pilot flies past you in her spaceracer at a constant speed of $0.800c$ relative to you. At the instant the spaceracer passes you, both of you start timers at zero.

(a) At the instant when you measure that the spaceracer has traveled $1.20\times {10}^8$ m past you, what does the race pilot read on her timer?

(b) When the race pilot reads the value calculated in part (a) on her timer, what does she measure to be your distance from her?

(c) At the instant when the race pilot reads the value calculated in part (a) on her timer, what do you read on yours?

Which physical quantity does a $\text{light-year}$ measure?

Two cylindrical rods, A and C, are made of aluminum and have the same length but different diameters. If both rods are subjected to the same tensile force, which rod will experience the greater elongation?

Which of the following is the correct SI unit for acceleration?

Which of the following units is used to measure $Force$?

Consider an electron in the $N$ shell. What is the largest orbital angular momentum it could have? Express your answers in terms of $\(\hslash\)$ and in SI units.

A photon of green light has a wavelength of $520$ nm. Find the photon's frequency, magnitude of momentum, and energy. Express the energy in both joules and electron volts.

The photoelectric work function of potassium is $2.3$ eV. If light that has a wavelength of $190$ nm falls on potassium, find the stopping potential in volts.