A uniform 120-lb beam is supported in a horizontal position by a pin and cable as shown in the figure. What is the magnitude of the force by the pin on the beam?
A. 94 lb
B. 88 lb
C. 63 lb
D. 75 lb
E. 150 lb
Answer: D
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Assume a gram of a substance marketed as "Pure Energy" is annihilated by a gram of a second substance "Anti-Pure Energy." How long would the energy released power a city which uses 109 watts of power?
a. 40 hrs b. 25 hrs c. 50 hrs d. 65 hrs e. 50000 hrs
The term stimulated emission would be used in explaining the operation of
a. an electron microscope. b. an X-ray tube. c. a microwave oven. d. a laser.
If a turntable's rotational speed is doubled, then the linear speed of a pet hamster sitting on the edge of the record will
A) double. B) halve. C) remain the same.