Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it, assuming that air has no effect on the ruler?
A) At least 3.0 cm
B) At least 4.9 cm
C) At least 6.8 cm
D) At least 9.8 cm
B
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Where in the Sun do fusion reactions happen?
A) everywhere inside the Sun B) core and radiation zone C) only the core
Each Voyager spacecraft carries a "postcard" designed to be understandable to any aliens that might someday encounter it. On the "postcard," scientists pinpointed the location of Earth by triangulating it between pulsars
Why did the scientists choose pulsars rather than some other type of star? A) Pulsars are very bright and therefore easy to find. B) Several pulsars are located within a dozen light-years of our solar system, making them useful for finding our solar system. C) We're pretty sure that aliens will have only radio telescopes and not optical telescopes, so they'll have a better chance of seeing pulsars than ordinary stars. D) Pulsars are easy to identify by their almost perfectly steady periods of pulsation.
A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
a. ?0.64 kJ b. ?0.40 kJ c. ?0.52 kJ d. ?0.28 kJ e. ?0.76 kJ
The current shown flowing through each coil must be 
A. increasing. B. decreasing. C. remaining constant. D. One needs more information to say how it is varying.