A 0.200-kg object is swung in a circular path and in a vertical plane on a 0.500-m length string. If the angular speed at the bottom is 8.00 rad/s, what is the tension in the string when the object is at the bottom of the circle?
a. 8.36 N
c. 16.7 N
b. 10.5 N
d. 6.40 N
A
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A bat, flying at 3.00 m/s toward a wall, emits a chirp at 50.0 kHz. If the wall reflects this sound pulse, what is the frequency of the echo received by the bat? (vsound = 340 m/s)
a. 51.5 kHz c. 40.8 kHz b. 51.2 kHz d. 50.9 kHz
The energy source at the center of our galaxy
a. is not visible at optical wavelengths. b. produces X-rays. c. must be less than 10 AU in diameter. d. all of the above e. none of the above.
Which of the six objects shown below has the largest rotational energy? (All have the same mass.)
A. 
B. 
C. 
D. 
E. 
F. 
A Styrofoam cooler has a surface area of 2,700 cm2 and a wall thickness of 3.0 cm. Styrofoam has a coefficient of thermal conductivity of 0.01 W/m C. A 2.0 kg block of ice is placed inside the cooler that has a temperature inside of 2.0
If the heat of fusion for ice is 333.7 kJ/kg and the temperature outside is 35.0
then how long will the ice last?
A. 74 hours B. 62 hours C. 55 hours D. 42 hours E. 24 hours