Which of the following is a planet that is visible to the naked eye from Earth?
A) Saturn
B) Uranus
C) Neptune
D) Keplar 10b
A
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How can you determine the distance to a spacecraft from the time it takes its radio signal to reach Earth?
What will be an ideal response?
A mass m = 2.0 kg is attached to a spring having a force constant k = 290 N/m as in the figure. The mass is displaced from its equilibrium position and released. Its frequency of oscillation (in Hz) is approximately
?
?
a.
12.
b.
0.50.
c.
0.010.
d.
1.9.
e.
0.080.
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^-10 m. The electric potential created by the electron at the position of the proton is
a. -13.6 V. b. +13.6 V. c. -27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
________ optics greatly reduces the effect of atmospheric turbulence by deforming the shape of the mirror by computer control
Fill in the blank(s) with correct word