When Nellie Newton hangs at rest in the middle of a clothesline, tensions will be the same in each side of the rope when
A) the lengths of each rope are the same.
B) the angles for both sides of the rope are equal.
C) she is in equilibrium.
Answer: B
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The horsepower required to rotate the shaft of Problem 2, if SAE-30 oil at 40°C fills the gap, is nearest:
(A) 0.203 hp (B) 0.191 hp (C) 0.174 hp (D) 0.123 hp
The flash from a camera is an example of a continuous wave
Indicate whether the statement is true or false
The mass of a hot-air balloon and its cargo (not including the air inside) is 250 kg. The air outside is at a temperature of 10°C and a pressure of 1 atm = 105 N/m2 . The volume of the balloon is 400 m3 . Which temperature below of the air in the balloon will allow the balloon to just lift off? (Air density at 10°C is 1.25 kg/m3.)
a. 37°C c. 99°C b. 293°C d. 200°C
Identify a true statement about the cosmic microwave background
A) It is blackbody radiation with an apparent temperature of 2.725 ± 0.002 K. B) It is radiation present in the ultraviolet spectrum. C) It is gamma radiation with an apparent temperature of 5.755 ± 0.005K. D) It is radiation that was present before the big bang.