A device that makes use of a bimetallic strip is
a. a thermometer.
b. a thermostat.
c. a choke control in an old automobile.
d. all of the above.
e. none of the above.
d
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Escape Speed: Planet W-70 has a radius of 2.48 × 107 m and an escape velocity of 23,300 m/s. What is the mass of W-70? (G = 6.67 × 10-11 N ? m2/kg2)
A. 1.01 × 1026 kg B. 2.02 × 1026 kg C. 3.03 × 1026 kg D. 4.04 × 1026 kg E. 5.05 × 1026 kg
Radioactive Decay: The atom 40K decays radioactively to the gas 40Ar. An ancient rock is found to contain enough 40Ar gas to indicate that 77.0% of the 40K in the rock has decayed to 40Ar since the rock solidified. (Any previous argon would have boiled out of liquid rock.) How long ago did the rock solidify? The half-life of 40K is 1.25 billion years.
A. 2.65 billion years B. 0.471 billion years C. 1.80 billion years D. 0.324 billion years
A large 75-kg lighting fixture can be hung from wires of identical size and shape made of aluminum, brass, or copper. The values of Young's modulus for these metals are 0.70 × 1011 Pa (aluminum), 0.91 × 1011 (brass), and 1.1 × 1011 (copper)
Which wire would stretch the least distance? A) brass B) copper C) aluminum D) They will all stretch the same distance.
An astronaut traveling with a speed v = 0.90c holds a meterstick in his hand. If he measures its length, he will obtain a value of
a. 1.0 m b. 2.3 m c. 0.19 m d. 0.43 m e. 0.81 m