A spaceship is traveling to the Moon. At what point is there no more gravitational force exerted on it by Earth?
A) when it gets above the atmosphere
B) when it is half-way there
C) when it is closer to the Moon than it is to Earth
D) There is no point where there is no more gravitational force exerted on the spaceship by Earth
D
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A tungsten filament is heated to 2700 K. At what wavelength is the maximum amount of radiation emitted? What fraction of the total energy is in the visible range (0.4 to 0.75 ?m)? Assume that the filament radiates as a gray body.
GIVEN
• Heated tungsten filament
• Filament temperature (Tf) = 2700 K
FIND
(a) Wavelength at which the maximum radiation is emitted (?max)
(b) Percentage of radiation in the visible ranger (0.4 to 0.75 ?m)
ASSUMPTIONS
• The filament radiates as a gray body
SKETCH
Imagine that in the distant future you (on earth) are watching a transmission from Pluto, which at the time is 5.0 light-hours from earth. You notice that a clock on the wall behind the person speaking in the video reads 12:10 p.m. You note that your watch reads exactly the same time. Is the station clock synchronized with your watch?
A. Yes, it is. B. No, it isn’t. C. The problem doesn’t give enough information to tell.
Uniform Circular Motion: The Moon is 3.84 × 108 m from Earth and takes 27.3 days to complete each orbit. What are the magnitude and direction of the acceleration of the Moon, assuming a circular orbit?
What will be an ideal response?
A cheetah can run at approximately 100 km/h and a gazelle at 80.0 km/h. If both animals are running at full speed, with the gazelle 50.0 m ahead, how long before the cheetah catches its prey?
a. 9.0 s b. 14 s c. 18 s d. 4.5 s e. 21 s