An auditorium has dimensions 10 m × 10 m × 60 m. How many moles of air fill this volume at one atmosphere and 0°C?
A. 2.7 × 102
B. 2.7 × 104
C. 2.7 × 103
D. 2.7 × 105
E. 2.7 × 106
Answer: D
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Energy Conservation With Conservative Forces: Swimmers at a water park have a choice of two frictionless water slides, as shown in the figure. Although both slides drop over the same height h, slide 1 is straight while slide 2 is curved, dropping quickly at first and then leveling out. How does the speed v1 of a swimmer reaching the bottom of slide 1 compare with v2, the speed of a swimmer reaching the end of slide 2?
A. v1 > v2 B. v1 < v2 C. v1 = v2 D. The heavier swimmer will have a greater speed than the lighter swimmer, no matter which slide he uses. E. No simple relationship exists between v1 and v2.
Of the following gases, which is the most important contributor to the Earth's greenhouse effect?
a. water vapor b. ozone c. CFCs d. methane
Centaurus A, with two large radio lobes, is an active galaxy
Indicate whether the statement is true or false
A juggler throws two balls up to the same height so that they pass each other halfway up when A is rising and B is descending. Ignore air resistance and buoyant forces. Which statement is true of the two balls at that point?
a. There is an residual upward force from the hand on each ball. b. There is a greater residual force from the hand on A than there is on B. c. Only gravity acts on B but there is an additional residual force from the hand on A. d. There is an additional downwards force besides gravity on each ball. e. The only force acting on each ball is the gravitational force.