Questions from College Physics

Q: Young’s modulus for diamond is about 20 times as large as that

Young’s modulus for diamond is about 20 times as large as that of glass. Does that tell you which is stronger? If not, what does it tell you?

Q: It is commonly said that wood floats because it is “lighter

It is commonly said that wood floats because it is “lighter than water” or that a stone sinks because it is “heavier than water.” Are these accurate statements? If not, correct them.

Q: The following hypothetical reaction shows a neutron (n) decaying into

The following hypothetical reaction shows a neutron (n) decaying into a proton (p+), an electron (e−), and an uncharged particle called an antineutrino/ : At first there is no charg...

Q: A thin aluminum target is illuminated with photons of wavelength λ.

A thin aluminum target is illuminated with photons of wavelength λ. A detector is placed at 90.0° to the direction of the incident photons. The scattered photons detected are found to have half the en...

Q: A negatively charged particle with charge −q is far away from

A negatively charged particle with charge −q is far away from a positive charge +Q that is fixed in place. As −q moves closer to +Q, (a) does the electric field do positive or negative work? (b) Does...

Q: A positive charge +2 µC and a negative charge −5

A positive charge +2 µC and a negative charge −5 µC lie on a line. In which region or regions (A, B, C) is there a point on the line a finite distance away...

Q: Draw a diagram of the human eye, labeling the cornea,

Draw a diagram of the human eye, labeling the cornea, the lens, the iris, the retina, and the aqueous and vitreous fluids.

Q: Bacteria swim using a corkscrew-like helical flagellum that rotates.

Bacteria swim using a corkscrew-like helical flagellum that rotates. For a bacterium with a flagellum that has a pitch of 1.0 μm that rotates at 110 rev/s, how fast could it swim if there were no “sli...

Q: A negatively charged rod is brought near a grounded conductor. After

A negatively charged rod is brought near a grounded conductor. After the ground connection is broken, the rod is removed. Is the charge on the conductor positive, negative, or zero? Explain.

Q: A 200 W infrared laser emits photons with a wavelength of 2

A 200 W infrared laser emits photons with a wavelength of 2.0 × 10−6 m, and a 200 W ultraviolet light emits photons with a wavelength of 7.0 × 10−8 m. (a) Which has greater energy, a single infrared...