Questions from College Physics

Q: Jamila has a set of reading glasses with focal length +0

Jamila has a set of reading glasses with focal length +0.50 m. (a) Are the lenses converging or diverging? (b) An object is placed 40.0 cm in front of one of the lenses. Where is the image formed?...

Q: A sound wave with a frequency of 400.0 Hz is

A sound wave with a frequency of 400.0 Hz is incident upon a set of stairs. The reflected waves from the vertical surfaces of adjacent steps interfere destructively. What is the minimum tread depth of...

Q: A 75.0 kg skier starts from rest and slides down

A 75.0 kg skier starts from rest and slides down a 32.0 m frictionless slope that is inclined at an angle of 15.0° with the horizontal. Ignore air resistance. Calculate the work done by gravity on the...

Q: Women often experience back pain when they are pregnant. Suppose a

Women often experience back pain when they are pregnant. Suppose a woman's mass before pregnancy is 68 kg and her center of mass when standing is located directly above the hips. By the thirty- fourth...

Q: Show that if two thin lenses are close together (s,

Show that if two thin lenses are close together (s, the distance between the lenses, is negligibly small), the two lenses can be replaced by a single equivalent lens with focal length feq. Find the va...

Q: A beam of electrons is accelerated across a potential of 15 kV

A beam of electrons is accelerated across a potential of 15 kV before passing through two slits. The electrons form an interference pattern on a screen 2.5 m in front of the slits. The first-order max...

Q: (a) In the diagram, what are the potentials at

(a) In the diagram, what are the potentials at points b and c? Let V = 0 at infinity. (b) What is the change in electric potential energy if a third charge q3 = +2.00 nC is moved from point b to poin...

Q: A police car’s radar gun emits microwaves with a frequency of f1

A police car’s radar gun emits microwaves with a frequency of f1 = 7.50 GHz. The beam reflects from a speeding car, which is moving toward the police car at 48.0 m/s with respect to the police car. Th...

Q: A camera uses a 200.0 mm focal length telephoto lens

A camera uses a 200.0 mm focal length telephoto lens to take pictures from a distance of infinity to as close as 2.0 m. What are the minimum and maximum distances from the lens to the sensor?

Q: A photoelectric effect experiment is performed with tungsten. The work function

A photoelectric effect experiment is performed with tungsten. The work function for tungsten is 4.5 eV. (a) If ultraviolet light of wavelength 0.20 µm is incident on the tungsten, calculate the stopp...