Kepler's second law implies that
a. a planet should move at its greatest speed when it is closest to the sun.
b. the most massive planets will have the greatest speed in their orbits.
c. the speed of a planet in its orbit depends on the size of the epicycle.
d. the mass of the planet determines how far the planet is from the sun.
e. the deferent and the epicycle have to be attached to the sun and not Earth.
A
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A free electron and a free proton are released in identical electric fields. (i) How do the magnitudes of the electric force exerted on the two particles compare?
1.It is millions of times greater for the electron. 2.It is thousands of times greater for the electron. 3.They are equal. 4.It is thousands of times smaller for the electron. 5.It is millions of times smaller for the electron.
The density of a 57-kg (126-lb) person who can float in salt water but not in fresh water is about
1) 505 kg/m3 (32 lb/ft3) 2) 1010 kg/m3 (63 lb/ft3) 3) 2020 kg/m3 (126 lb/ft3) 4) 4040 kg/m3 (252 lb/ft3) and has a volume of about 5) 1 ft3. 6) 2 ft3. 7) 3 ft3. 8) 4 ft3. 9) need more information
A gray opaque surface has an emissivity of 0.8 at 400ºF. Determine the radiosity if it is irradiated at 1000 Btu/hr?ft^2.
What will be an ideal response?
A(n) ____ is a commonly accepted set of scientific ideas and assumptions
a. theory b. paradigm c. hypothesis d. natural law e. model