A reasonable estimate for the mass of an ordinary passenger car is
A) 100 kg
B) 1000 kg
C) 5000 kg
D) 10,000 kg
B
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A 15.0-kg child is sitting on a playground teeter-totter, 1.50 m from the pivot. What force, applied 0.300 m on the other side of the pivot, is needed to make the child lift off the ground?
A) 75.0 N B) 736 N C) 22.5 N D) 44.1 N E) 66.2 N
The graph below indicates the temperature of Saturn's atmosphere as a function of distance from the upper cloud layer. Water will condense to form droplets at a temperature of approximately 270 K in the atmosphere of Saturn. At what distance from the upper cloud layer will clouds of water vapor form?
a.
-250 km
b.
-150 km
c.
0 km
d.
150 km
e.
250 km
What happens to energy in the convection zone of the Sun?
A) Energy slowly leaks outward through the diffusion of photons that repeatedly bounce off ions and electrons. B) Energy is produced in the convection zone by nuclear fusion. C) Energy is transported outward by the rising of hot plasma and the sinking of cooler plasma. D) Energy is consumed in the convection zone by the creation of electrons and positrons. E) Energy is conserved so while the gas moves up and down, there is no net transport of energy.
The vernal equinox marks the beginning of spring in the northern hemisphere
Indicate whether the statement is true or false