Questions from College Physics

Q: A converging lens made from dense flint glass is placed into a

A converging lens made from dense flint glass is placed into a container of transparent glycerin. Describe what happens to the focal length.

Q: Show that the amplitudes of the graphs you made in Problem 89

Show that the amplitudes of the graphs you made in Problem 89 satisfy the equation A′ = 2A cos (ωt), where A′ is the amplitude of the wave you plotted and A is 5.0 cm, the amplitude of the waves that...

Q: An axon has the outer part of its membrane positively charged and

An axon has the outer part of its membrane positively charged and the inner part negatively charged. The membrane has a thickness of 4.4 nm and a dielectric constant κ = 5. If we model the axon as a p...

Q: A 6.2 cm by 2.2 cm parallel plate

A 6.2 cm by 2.2 cm parallel plate capacitor has the plates separated by a distance of 2.0 mm. (a) When 4.0 × 10−11 C of charge is placed on this capacitor, what is the electric field between the plat...

Q: A lens is placed at the end of a bundle of optical

A lens is placed at the end of a bundle of optical fibers in an endoscope. The purpose of the lens is to make the light rays parallel before they enter the fibers (in other words, to put the image at...

Q: It takes a flea 1.0 × 10−3 s

It takes a flea 1.0 × 10−3 s to reach a peak speed of 0.74 m/s. (a) If the mass of the flea is 0.45 × 10−6 kg, what is the average power required? (b) Insect muscle has a maximum output of 60 W/kg....

Q: If we know the potential at a single point, what (

If we know the potential at a single point, what (if anything) can we say about the magnitude of the electric field at that same point?

Q: A uniform string of length 10.0 m and weight 0

A uniform string of length 10.0 m and weight 0.25 N is attached to the ceiling. A weight of 1.00 kN hangs from its lower end. The lower end of the string is suddenly displaced horizontally. How long d...

Q: Another example of motional emf is a rod attached at one end

Another example of motional emf is a rod attached at one end and rotating in a plane perpendicular to a uniform magnetic field. We can analyze this motional emf using Faraday’s law....

Q: At what time is energy stored in the inductor 0.10

At what time is energy stored in the inductor 0.10 times its initial value?