Questions from College Physics

Q: Figure 29.7 is an energy level diagram for 208Tl.

Figure 29.7 is an energy level diagram for 208Tl. What are the energies of the photons emitted for the six transitions shown?

Q: A flat square of side s0 at temperature T0 expands by Δs

A flat square of side s0 at temperature T0 expands by Δs in both length and width when the temperature increases by ΔT. The original area is and the final area is (s0 + Î...

Q: The solar energy arriving at the top of Earth's atmosphere from the

The solar energy arriving at the top of Earth's atmosphere from the Sun has intensity 1.4 kW/m2. (a) How much mass does the Sun lose per day? (b) What percent of the Sun's mass is this?

Q: Estimate the magnetic field required at the LHC to make 7.

Estimate the magnetic field required at the LHC to make 7.0 TeV protons travel in a circle of circumference 27 km. Start by deriving an expression, using Newton's second law, for the field magnitude B...

Q: Two objects with masses m1 and m2 approach each other head-

Two objects with masses m1 and m2 approach each other head-on with equal and opposite momenta so that the total momentum is zero. Show that, if the collision is elastic, the final speed of each object...

Q: A rotating flywheel slows down with constant angular acceleration due to friction

A rotating flywheel slows down with constant angular acceleration due to friction in its bearings. At t = 0, its angular velocity is 420 rad/s. At t = 60 s, its angular velocity is 340 rad/s. (a) Wha...

Q: Suppose you have a filling in one of your teeth, and

Suppose you have a filling in one of your teeth, and, while eating some ice cream, you suddenly realize that the filling came out. One of the reasons the filling may have become detached from your too...

Q: Light travels through tanks filled with various substances. The indices of

Light travels through tanks filled with various substances. The indices of refraction of the substances n and the lengths of the tanks are given. Rank them in order of the time it takes light to trave...

Q: A patient’s heart pumps 5.0 L of blood per minute

A patient’s heart pumps 5.0 L of blood per minute into the aorta, which has a diameter of 1.8 cm. The average force exerted by the heart on the blood is 16 N. What is the average mechanical power outp...

Q: A string 2.0 m long is held fixed at both

A string 2.0 m long is held fixed at both ends. If a sharp blow is applied to the string at its center, it takes 0.050 s for the pulses to travel to the ends of the string and return to the middle. Wh...