The space time diagram in figure R2.12 shows the world lines of various objects. Which object has the largest speed at time t = 4 s?
A. A
B. B
C. C
D. D
E. E
B. B
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What makes us think that Mars must once have had an atmosphere that was warmer and had higher surface pressure?
A) We think it for purely theoretical reasons, based on calculations showing that the Sun has brightened with time. B) The atmosphere is too cold and thin for abundant liquid water today, yet we see evidence of large areas of flowing water in the past. C) The presence of inactive volcanoes on Mars tells us that there must once have been a lot of outgassing, and hence a thicker atmosphere. D) The fact that parts of Mars have a lot of craters tells us that Mars must once have been much warmer.
A series RLC circuit has a 100-? resistor, 4.00-mH inductor and a 0.100-?F capacitor connected across a 120-V rms ac source at the resonant frequency. What is the power dissipated by the circuit?
A) 100 W B) 120 W C) 144 W D) 160 W E) 45.8 W
The flow rate of blood through the average human aorta, of radius 0.95 cm, is about 90 cm3/s. What is the speed of the blood flow through the aorta?
a. 14 cm/s b. 32 cm/s c. 37 cm/s d. 32 cm/s
100 grams of liquid nitrogen at 77 K is stirred into a beaker containing 200 grams of 5°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? (The heat of evaporation of nitrogen is 6.09 cal/gram and the heat of fusion of water is 80 cal/gram.)