Questions from College Physics

Q: Where would you place a third small object with the same charge

Where would you place a third small object with the same charge so that the electric field is zero at the corner of the square labeled A?

Q: (a) Why is the coolant fluid in an automobile kept

(a) Why is the coolant fluid in an automobile kept under high pressure? (b) Why do radiator caps have safety valves, allowing you to reduce the pressure before removing the cap? [Hint: See Fig. 14.7a...

Q: (a) Calculate the capacitance per unit length of an axon

(a) Calculate the capacitance per unit length of an axon of radius 5.0 µm (see Fig. 17.14). The membrane acts as an insulator between the conducting fluids inside and outside the neuron. The membrane...

Q: Why do lakes and rivers freeze first at their surfaces?

Why do lakes and rivers freeze first at their surfaces?

Q: An electron beam in an oscilloscope is deflected by the electric field

An electron beam in an oscilloscope is deflected by the electric field produced by oppositely charged metal plates. If the electric field between the plates is 2.00 × 105 N/C directed downward, what i...

Q: Grant jumps 1.3 m straight up into the air to

Grant jumps 1.3 m straight up into the air to slam-dunk a basketball into the net. With what speed did he leave the floor?

Q: Two parallel long straight wires are suspended by strings of length L

Two parallel long straight wires are suspended by strings of length L = 1.2 m. Each wire has mass per unit length 0.050 kg/m. When one wire carries 25.0 A of current and the other carries 100.0 A, the...

Q: An x-ray photon of initial frequency 3.0 ×

An x-ray photon of initial frequency 3.0 × 1019 Hz collides with a free electron at rest; the scattered photon moves off at 90°. What is the frequency of the scattered photon?

Q: The diameter of a certain artery has decreased by 25% due

The diameter of a certain artery has decreased by 25% due to arteriosclerosis. (a) If the same amount of blood flows through it per unit time as when it was unobstructed, by what percentage has the b...

Q: A neutron (mass 939.565 MeV/c2) disintegrates

A neutron (mass 939.565 MeV/c2) disintegrates into a proton (mass 938.272 MeV/c2), an electron (mass 0.5110 MeV/c2), and an antineutrino (mass negligibly small). What is the sum of the kinetic energie...