A skydiver of 75 kg mass has a terminal velocity of 60 m/s. At what speed is the resistive force on the skydiver half that when at terminal speed?
a. 15 m/s
b. 49 m/s
c. 30 m/s
d. 42 m/s
e. 36 m/s
D
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Glycerin, with a viscosity of 1.50 Ns/m2, is flowing with an average speed of 1.20 m/s through a tube that has a radius of 5.00 mm and is 25.0 cm long. What is the drop in pressure?
A) 144 kPa B) 45.8 kPa C) 72.0 kPa D) 76.3 kPa E) 129 kPa
If an object falls with constant acceleration, the velocity of the object must
A) be constant also. B) continually change by the same amount each second. C) continually change by varying amounts, depending on its speed. D) continually decrease. E) none of the above
Interferometry is easiest to use with telescopes that observe at very short wavelengths
a. True b. False Indicate whether the statement is true or false
A woman who weighs 500 N stands on an 8.0 m long board that weighs 100 N. The board is supported at each end. The support force at the right end is 2 times the support force at the left end. How far from the right end is the woman standing?
a. 4.0 m c. 2.7 m b. 2.4 m d. 1.6 m