A hydraulic lift is designed with an output cylinder that has 36 X the area of the input cylinder. If a force F is applied to the input cylinder, the output cylinder can supply a force equal to _______.
A. 1/6 F
B. 1/36 F
C. 6 F
D. 36 F
D. 36 F
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A 2500 kg car accelerates up to a velocity of 30.0 m/s in 8.00 seconds. The work done by the engine to accelerate the car is
A. 
B. 
C. 
D. 
E. 
Many specialized applications (ranging from advanced gas-turbine blades to medical devices and implants) require metal components that are coated with protective material layer. In a manufacturing plant for such coatings, infrared lamp is used for curing the coating on metal plates. The lamp provides uniform irradiation of which a flux of 1600 W/m2 is absorbed by the metal plate surface, which has an emissivity of 0.5 for the radiation at the temperature of the coating. Air is used to cool the plate, which is kept in an enclosed environment, and it enters the enclosure at 200C and leaves from the coating process at 300C. (a) If the convective heat transfer coefficient between the coated plate surface and cooling air is 15 W/ (m2 K), estimate the temperature of coating on plate surface.
(b) If the engineer who invented believes that the cure temperature (or surface temperature) of 500C provides a coating with better durability, estimate the infrared lamp irradiation necessary to attain the required average cure temperature for the process.
GIVEN
FIND
- Temperature of coating on plate surface
- Infrared lamp irradiation necessary to attain required cure temperature.
ASSUMPTIONS
- Steady state conditions prevail
- Other heat loss to surrounding is negligible
When the distance between two charges is halved, the electric force between the charges
A) quadruples. B) doubles. C) is half. D) is reduced by one-quarter. E) none of the above
A carbon-14 nucleus decays to a nitrogen-14 nucleus by beta-minus decay. How much energy (in MeV) is released if carbon-14 has a mass of 14.003242 u and nitrogen-14 has a mass of 14.003074 u? (1 u = 931.5 MeV/c2)
A) 0.0156 MeV B) 0.156 MeV C) 1.56 MeV D) 15.6 MeV