The proton-proton chain converts four hydrogen nuclei into one helium nucleus plus energy
Indicate whether the statement is true or false
TRUE
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Why are collisions between galaxies more likely than collisions of stars within galaxies?
A) Relative to their sizes, galaxies are much closer together than stars. B) Galaxies are much larger than stars. C) Galaxies travel through space much faster than stars. D) Galaxies have higher redshifts than stars.
A satellite is in a circular orbit about the Earth at an altitude at which air resistance is negligible. Which of the following statements is true?
a. There is only one force acting on the satellite. b. There are two forces acting on the satellite, and their resultant is zero. c. There are two forces acting on the satellite, and their resultant is not zero. d. There are three forces acting on the satellite. e. None of the preceding statements are correct.
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
A person with an initial mass of 70 kg climbs a stairway and thereby rises 6.0 m in elevation. By how much does his mass increase by virtue of his increased potential energy? (c = 3.0 × 108 m/s)
What will be an ideal response?