The evidence favors a universe whose overall geometry is flat. That evidence comes from observations of
A) the earliest galaxies in the universe.
B) the force of gravity acting on laboratory objects.
C) the center of our galaxy.
D) the cosmic background radiation.
E) distant quasars.
D
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All the following statements are true. Which one explains why convection can occur in the troposphere but not in the stratosphere?
A) Atmospheric pressure is much greater in the troposphere than in the stratosphere. B) The stratosphere contains significant amounts of ozone but the troposphere does not. C) Temperature declines with altitude in the troposphere but increases with altitude in the stratosphere. D) Clouds tend to form in the troposphere but not the stratosphere.
A capacitor of unknown capacitance C is charged to 100 V and then connected across an initially uncharged 60-mF capacitor. If the final potential difference across the 60-mF capacitor is 40 V, determine C
a. 49 mF b. 32 mF c. 40 mF d. 90 mF e. 16 mF
You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. When you increase the plate separation, what happens to the value of ?V?
1.It increases. 2.It decreases. 3.It stays the same.
A ball is thrown from the edge of a 20.0 m high cliff with a speed of 20.0 m/s at an angle of 30.0° below horizontal. What is the speed of the ball when it hits the ground below the cliff?
A) 37.6 m/s B) 28.1 m/s C) 31.4 m/s D) 43.2 m/s E) 29.8 m/s