Questions from College Physics

Q: A certain electric device has the current-voltage (I-

A certain electric device has the current-voltage (I-V) graph shown with Problem 30. What is the power dissipated at points 1 and 2?

Q: Find the electric potential energy for the following array of charges:

Find the electric potential energy for the following array of charges: charge q1 = +4.0 µC is located at (x, y) = (0.0, 0.0) m; charge q2 = +3.0 µC is located at (4.0, 3.0) m; and charge q3 = −1.0 µC...

Q: If the pressure amplitude of a sound wave is doubled, what

If the pressure amplitude of a sound wave is doubled, what happens to the displacement amplitude, the intensity, and the intensity level?

Q: In a CRT, electrons moving at 1.8 × 107

In a CRT, electrons moving at 1.8 × 107 m/s pass between the poles of an electromagnet where the magnetic field is 2.0 mT directed upward. (a) What is the radius of their circular path w...

Q: A positron (q = +e) moves at 5.

A positron (q = +e) moves at 5.0 × 107 m/s in a magnetic field of magnitude 0.47 T. The magnetic force on the positron has magnitude 2.3 × 10−12 N. (a) What is the component of the positron's velocit...

Q: An electromagnetic flowmeter is used to measure blood flow rates during surgery

An electromagnetic flowmeter is used to measure blood flow rates during surgery. Blood containing ions (primarily Na+) flows through an artery with a diameter of 0.50 cm. The artery is in a magnetic f...

Q: When two particles travel through a region of uniform magnetic field pointing

When two particles travel through a region of uniform magnetic field pointing out of the plane of the paper, they follow the trajectories shown. What are the signs of the charges of each particle?

Q: What is the electric force on the chloride ion in the lower

What is the electric force on the chloride ion in the lower right- hand corner in the diagram? Since the ions are in water, the “effective charge” on the chloride i...

Q: Six protons move (at speed v) in magnetic fields (

Six protons move (at speed v) in magnetic fields (magnitude B) along circular paths. Rank them in order of the radius of their paths, greatest to smallest. (a) v = 6 × 106 m/s, B = 0.3 T (b) v = 3 × 1...

Q: A beam of α particles (helium nuclei) is used to

A beam of α particles (helium nuclei) is used to treat a tumor located 10.0 cm inside a patient. To penetrate to the tumor, the α particles must be accelerated to a speed of 0.458c, where c is the spe...