A proton moving at 5.0 × 104 m/s horizontally enters a region where a magnetic field of 0.12 T is present, directed vertically downward. What magnitude force acts on the proton due to this field?
(e = 1.60 × 10-19 C)
What will be an ideal response?
9.6 × 10-16 N
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Consider two cylinders of gas identical in all respects except that one contains O2 and the other He. Both hold the same volume of gas at STP and are closed by a movable piston at one end
Both gases are now compressed adiabatically to one-third their original volume. Which gas will show the greater pressure increase? A) the O2 B) the He C) neither; both will show the same increase D) impossible to tell from the information given
In astronomy, an interferometer can be used to
A) decrease the effects of light pollution in getting darker sky backgrounds. B) yield better seeing conditions with optical telescopes. C) increase the sensitivity of infrared telescopes to longer wavelengths. D) speed up the processing of CCD images. E) improve the angular resolution of radio telescopes.
A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
a. +2.0 J b. +20 J c. ?2.0 J d. ?20 J e. +40 J
How do we know that pulsars must be very small in size (radius)?
A) We have measured their radii directly in high-resolution telescope images. B) Their small sizes are inferred from careful study of their spectra. C) Some spin so rapidly that if they were larger in size, their surfaces would be moving faster than the speed of light. D) Only very small objects can beam radiation into space. E) This is only a theory that has not yet been confirmed by observations.