A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale. Assume there is no frictional force between the bottom of the scale and the hill. The static friction force the scale exerts on the person is
a. 0 N.
b. 201 N.
c. 211 N.
d. 553 N.
e. 580 N.
a
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How should we expect the Milky Way's interstellar medium to be different in 50 billion years than it is today?
A) The total amount of gas will be about the same, but the percentage of elements heavier than hydrogen and helium will have risen from the current 2% to more than 50%. B) The total amount of gas will be much greater, since many stars will undergo supernovae between now and then. C) The total amount of gas will be much less than it is today. D) Thanks to the recycling of the star-gas-star cycle, the interstellar medium should look about the same in 50 billion years as it does today.
Two equal charges, each Q, are separated by some distance. What third charge would need to be placed half way between the two charges so that the net force on each charge would be zero?
a. ?Q b. ?Q/2 c. ?Q/4 d. ?Q/8
What kind of variable stars are pre-Main Sequence stars undergoing gravitational contraction and exhibiting erratic changes in their luminosities?
A) R Coronae Borealis B) RR Lyrae C) Cepheid D) T Tauri E) Herbig-Haro
In relativity, two people share the same reference frame only if what is true?
A) They are not moving relative to one another. B) They are both located in the same place. C) They are both located in the same place and are stationary. D) They agree on the laws of nature.