When Jim and Rob ride bicycles, Jim can only accelerate at three quarters the acceleration of Rob. Both start from rest at the bottom of a long straight road with constant upward slope. If Rob takes 5.0 minutes to reach the top, how much earlier should Jim start to reach the top at the same time as Rob?
a. 25 s
b. 40 s
c. 46 s
d. 55 s
e. 75 s
C
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A 200 ft. high by 60 ft. wide building is on fire, and one of its walls is at 1500ºF. Air at 100ºF and 40% relative humidity is near the building as shown in the figure. Estimate the net heat transfer to the air from this burning wall if the wall’s emissivity is 0.85.
You are somewhere in the solar system. It's much colder than Earth, and you are airborne in the planet's atmosphere, with blue skies around you. And while you can tell that your planet is rotating fairly rapidly, it is remaining daylight at all times, indicating a very large axis tilt (much larger than Earth's). Where are you?
A) Saturn B) Uranus C) Mars D) Jupiter
All terrestrial planets have moons
Indicate whether the statement is true or false
Starburst galaxies produce most of their light in the wavelength range of
A) X-rays. B) the ultraviolet. C) the visible. D) the infrared. E) all wavelengths.