A crate of grapes lifted 10 meters gains 200 J of potential energy. If the same crate is instead lifted 20 meters, its gain in potential energy is
A) half as much.
B) the same.
C) twice as much.
D) four times as much.
E) more than four times as much.
Answer: C
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Which of the following statements describes a true observation that represents strong physical evidence that magnetic poles are not the same as electric charges? Select all answers that are both physically true and represent relevant evidence. (To select multiple answers using the back of the book, point to answers with multiple fingers.)
A. We describe magnetic poles as being north and south but charges as being positive or negative. B. A magnet does not exert force on a motionless charged particle, but another charged particle will. C. A magnet exerts force in a different direction on a motionless charged particle than a charged particle does. D. Magnetic fields are measured in teslas, but electric fields are measured in N/C. E. No one has seen an isolated magnetic pole. F. What do you mean? At the deepest level, electric charges and magnetic poles really are the same thing!
For what slit separation will no 1st order double-slit-fringe appear for 550. nm light?
What will be an ideal response?
How do we know what Earth's temperature was many years before thermometers existed?
A) From computer calculations that start from the conditions (the atmosphere and sea level, primarily) of earlier times and then calculate the resulting temperature. B) From laboratory experiments that reconstruct the conditions (the atmosphere and sea level, primarily) of earlier times and then measure the resulting temperature. C) From such indirect methods as tree rings (the thickness and density of a ring is dependent on the temperature at the time of growth) and annual layers of ice in ice cores. D) From historical information about the climate recorded by Vikings and other travelers during the ice ages. E) From computer calculations that work backward from the present time to calculate the temperature at earlier times.
The least massive stars, including our sun, eventually end their lives as
A) neutron stars. B) red giants. C) black holes. D) white dwarfs. E) quasars.