A metal wire has a resistance of 14.00 ? at a temperature of 25.0°C. If the same wire has a resistance of 14.55 ? at 90.0°C, what is the resistance when its temperature is ?32.0°C?
a. 2.21 ?
b. 13.5 ?
c. 5.13 ?
d. 39.2 ?
e. 13.0 ?
b
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Center of Mass: Three balls are moving along a straight line having the instantaneous positions shown in the figure. At that instant, find the location and velocity of the center of mass (or center of gravity) of this system.
What will be an ideal response?
An isolated black hole in empty intergalactic space would be difficult to detect because
a. there would be no stars behind it whose light it could bend or lens gravitationally b. it could not emit light from inside its event horizon c. no companion stars would be affected by its gravitational field d. no matter would be falling into it to create an x-ray emitting accretion disk e. All of the above
Medium A blocks more of a certain wavelength of radiation than medium B. Medium A has a higher
A) albedo. B) transparency. C) clarity. D) opacity. E) seeing.
An 8000-kg aluminum flagpole 100 m long is heated by the Sun from a temperature of 10°C to 20°C. Find the work done (in J) by the aluminum if the linear expansion coefficient is 24 × 10^?6 (°C)?1 . (The density of aluminum is 2.7 × 10^3 kg/m3 and 1 atm = 1.0 × 10^5 N/m2.)
a. 287 b. 425 c. 213 d. 710 e. 626