A CD makes one complete revolution every tenth of a second. Which has the largest linear (tangential) velocity?
A. point 1
B. point 2
C. point 3
D. point 4
D. point 4
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The pressure at a depth of 1.25 m in a tank of liquid is measured to be 125.5 kPa. The tank is open to the outside air - which is at a pressure of 102.0 kPa. What is the density of the fluid?
A. 1920 
B. 10200
C. 18800
D. 2400
A 0.140-kg baseball is dropped and reaches a speed of 1.20 m/s just before it hits the ground and bounces. It rebounds with an upward velocity of 1.00 m/s. What is the change of the ball's momentum during the bounce?
A) 0.0280 kg ? m/s upwards B) 0.0280 kg ? m/s downwards C) 0.308 kg ? m/s upwards D) 0.308 kg ? m/s downwards E) 0.000 kg ? m/s
Determine the molar analysis of standard air (79% N2, 20% O2, and 1% argon, by volume) with 100 ppm of radon gas at 101 kPa, 20ºC.
What will be an ideal response?
The greenhouse effect occurs on Earth because carbon dioxide is
a. transparent to visible light and opaque to infrared radiation. b. opaque to visible light and transparent to infrared radiation. c. totally opaque to both visible light and infrared radiation. d. totally opaque to both visible light and infrared radiation.