Two baseballs are released at the same time. One is dropped from rest and the other is given an initial horizontal velocity. Which of the following is not true? Ignore atmospheric drag
a. Both baseballs hit the ground at the same time.
b. Both have the same vertical component of velocity as they reach impact.
c. The horizontal component of velocity increases at a greater rate than the vertical component of velocity for both while they are both in the air.
d. The horizontally-released ball has a greater speed than the other ball for the whole trip.
c
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Two point charges, one q and the other -q, form a dipole separated by a distance 2L. A third charge Q is placed midway between these two charges. If the only charge that is negative is -q, what is the force on Q?
Form when hot air near the surface rises quickly through a small pocket of cooler, low-pressure air above it
A. Waterspout |
B. Tropical Cyclones |
C. Tornado |
D. Lightning |
E. Great Red Spot |
F. Dust Devil |
Radioactive Decay: The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially contain equal numbers of atoms of these isotopes. How will the activities (number of decays per second) of the samples compare?
A. The activity of the cobalt-60 sample will be greater. B. The activities cannot be compared without more information. C. The activities will be equal. D. The activity of the strontium-90 sample will be greater.
The circuit below contains three resistors, A, B, and C, which all have equal resistances. The emf ? = 110V. Which resistor generates the most thermal energy after the switch is closed?
a.
A
b.
B
c.
C
d.
A and B
e.
All three generate equal amounts of thermal energy.