A huge interstellar cloud collapsed into a rotating disk with a central bulge. What did this object become?
A. The disk was the solar nebula and the bulge became the Sun.
B. A large belt containing asteroids in a gap between the orbits of Mars and Jupiter.
C. The disk was the Solar nebula and the bulge became Jupiter.
D. They formed the outer planets which eventually met up with the Sun.
Answer: A
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The charge on the proton is the same as
A) the charge on the neutron. B) the charge on the neutron, but of the opposite sign. C) the charge on the atom. D) the charge on the electron. E) the charge on the electron, but of the opposite sign.
When a microwave filter consisting of vertical parallel metal rods is in the absorbing position, oscillating currents are set up in the rods. At any one instant, the current in each rod has the same magnitude and direction. At that instant
a. the rods will try to move apart horizontally. b. the rods will try to move together horizontally. c. the rods will try to shift vertically upwards. d. the rods will try to shift vertically downwards. e. the rods will not be affected because the source of current is not a battery.
As a space shuttle is launched into orbit, the direction of its acceleration
a. always points upward b. always points downward c. varies between pointing upward and pointing downward d. stays constant
If the molecules in a tank of hydrogen have the same rms speed as the molecules in a tank of oxygen, we may be sure that:
A. the pressures are the same B. the hydrogen is at the higher temperature C. the hydrogen is at the greater pressure D. the temperatures are the same E. the oxygen is at the higher temperature