A track star in the broad jump goes into the jump at 12 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth?
0.84 s
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Suppose the ends of a 20-m long steel beam are rigidly clamped at 0°C to prevent expansion. The rail has a cross-sectional area of 15 cm2 . What force does the beam exert when it is heated to 40°C? (asteel = 1.1 × 10^-5/C°, Ysteel = 2.0 × 10^11 N/m2)
a. 2.6 × 10^5 N c. 1.3 × 10^5 N b. 5.6 × 10^4 N d. 6.5 × 10^2 N
When sound travels faster higher above the ground than below, bending of sound tends to be
A) upward. B) downward. C) to the left. D) to the right. E) none of the above
Suppose it is full Moon. What phase of Earth would someone on the Moon see at this time?
A) Full Earth B) New Earth C) First quarter Earth D) Earth does not go through phases as seen from the Moon.
Regions of Earth where the Sun is more directly overhead will experience ________.
A. colder weather B. warmer weather C. more eclipses D. longer nights E. None of these choices is correct.