An object moves in a circle of radius R at constant speed with a period T. If you want to change only the period in order to cut the object's acceleration in half, the new period should be
A) T/4.
B) T/2.
C) T/ .
D) T .
E) 4T.
Answer: D
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Four identical point charges (+6.0 nC) are placed at the corners of a rectangle which measures 6.0 m × 8.0 m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?
a. 58 V b. 63 V c. 43 V d. 84 V e. 11 V
How fast must a nonrelativistic electron move so its de Broglie wavelength is the same as the wavelength of a 3.4-eV photon? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
A) 1700 m/s B) 1600 m/s C) 2000 m/s D) 1900 m/s E) 1400 m/s
Even though Titan has liquid methane on its surface, some internal heat, and plenty of carbon-containing compounds, it is not a suitable place for life because
A) Titan orbits within Saturn's radiation belt so its surface is completely sterilized by high-energy particles B) there is too much volcanic activity on the surface C) it has no ozone layer to protect the surface from harmful UV rays from the Sun D) it is far too cold, and methane is not a very good biological solvent
As air rises, it cools and clouds can form. The rate of cooling determines the elevation of cloud formation and cloud thickness. From first to last, the rates of cooling are
A) dry adiabatic lapse rate—cloud base; moist adiabatic lapse rate—cloud thickness; environmental lapse rate—upper limit of cloud. B) moist adiabatic lapse rate—cloud base; dry adiabatic lapse rate—cloud thickness; environmental lapse rate—upper limit of cloud. C) environmental lapse rate—cloud base; moist adiabatic lapse rate—cloud thickness; dry adiabatic lapse rate—upper limit of cloud.