A rock is thrown vertically into the air. At the top of its path the net force on it is
A) less than mg.
B) mg.
C) more than mg.
Answer: B
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A marble has a diameter of 2 cm. At what distance would the marble have an angular diameter of 1 arc second?
a. 4.1 cm b. 4.1 miles c. 4.1 m d. 4.1 ft e. 4.1 km
Refracting Telescope: Mary builds a simple refracting telescope using two lenses of focal length 80 cm and 5.0 cm. The respective diameters are 60 mm and 10 mm. How many degrees wide does the moon appear through the telescope if it appears only 1/2 degree wide with the "naked eye"?
Fill in the blank(s) with the appropriate word(s).
Wind blowing over the top of a hill
A) increases atmospheric pressure there. B) decreases atmospheric pressure there. C) does not affect atmospheric pressure there.
A charged particle (mass = m, charge = q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed v?
a. qvB toward the east b. Zero c. qvB toward the west d. qvB upward e. qvB toward the south