An automobile air bag
a. increases the contact time in stopping a person.
b. reduces the impact force in a collision.
c. increases the surface area of the impact force.
d. does all of the above.
d
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The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see a continuous spectrum?
a. 1
b. 2
c. 3
d. 2 and 3
e. none of them
The largest of the red stars are the ____________________ stars
Fill in the blank(s) with correct word
When atmospheric pressure increases, what happens to the absolute pressure at the bottom of a pool?
A) It does not change. B) It increases by a lesser amount. C) It increases by the same amount. D) It increases by a greater amount. E) It depends on the depth of the pool.
If a pendulum makes 12 complete swings in 8.0 s, what are its (a) frequency and (b) period?
What will be an ideal response?