Which of the following units is not an energy unit?
A. Calorie
B. Horsepower
C. Kilocalorie
D. Joule
E. Kilowatt-hour
Answer: B
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Causing an object to start moving on a frictional surface requires
A. less force than is needed to keep it moving on the surface. B. the same force as is needed to keep it moving on the surface. C. more force than is needed to keep it moving on the surface. D. a force equal to the weight of the object. E. a force opposite to the normal force.
A 25-g traffic light hangs midway on a cable between two poles 40 meters apart. If the sag in the cable is 0.40 meters, what is the tension in each side of the cable?
a. 12,200 N c. 4900 N b. 9800 N d. 6100 N
A small oven with a surface area of 0.28 m2 is located in a room in which the walls and the air are at a temperature of 27°C. The exterior surface of the oven is at 150°C and the net heat transfer by radiation between the oven’s surface and the surroundings is 586 W. If the average convective heat transfer coefficient between the oven and the surrounding air is 11 W/(m2 K), calculate: (a) the net heat transfer between the oven and the surroundings in W, (b) the thermal resistance at the surface for radiation and convection, respectively, in K/W, and (c) the combined heat transfer coefficient in W/(m2 K).
GIVEN
FIND
ASSUMPTIONS
- Steady state prevails
SKETCH
Radiation Doses: A 70-kg researcher absorbs 4.5 × 108 neutrons in a work day, each of energy 1.2 MeV. The relative biological effectiveness (RBE) for these neutrons is 10. What is the equivalent dosage of the radiation exposure for this researcher, in millirem?
A. 1.2 mrem B. 0.39 mrem C. 0.77 mrem D. 3.7 mrem E. 12 mrem