An astronaut tosses a ball out in space where gravitational forces may be neglected. What will happen to the ball?
a. It will stop as soon as the force the astronaut gave it is used up.
b. It will stop when the energy the astronaut gave it runs out.
c. It will stop after a short time because there is no gravity to keep it moving.
d. It will move in a circle like a boomerang.
e. It will be slowed down very gradually by collisions with molecules in space.
E
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In thermal management or cooling of microchip modules for high-powered computer systems, very high heat fluxes have to be accommodated in the design of the cooling method. For many such cases, immersion cooling via pool boiling in a dielectric fluid is often employed [94]. In a pool boiling experiment to evaluate the cooling behavior from a simulated chip module, water is boiled at atmospheric pressure over a submerged emery-polished copper-plate heater. If the surface excess temperature is measured to be 14.5 K, what is the heat flux dissipated by boiling from the copper plate?
GIVEN
? Water at atmospheric pressure boiling on emery-polished copper-plate heater
? Surface excess temperature (?Tx)= 14.5 K
FIND
(a) Heat flux dissipated by boiling from copper plate.
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, the properties of water at 100°C are
Magnetic fields enhance the collapse of a gas cloud in star formation with bipolar flows
Indicate whether the statement is true or false
In a collision the total ____________ is the same before and after
Fill in the blank(s) with correct word
How many significant figures are there in the number 46.20?
a) 4 b) 3 c) 2 d) 5