Farsightedness can usually be corrected with
A) convex lenses.
B) concave lenses.
C) convex mirrors.
D) cylindrical lenses.
E) concave mirrors.
A
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You hold a 5-newton rock motionless in your hand. Regarding the forces on this rock,
A) the net force on the rock is zero. B) the downward force of gravity is balanced by the upward force of air resistance. C) there are no forces of any kind acting on the rock, because it is not moving. D) the net force on the rock is 5 newtons, directed downward. E) the net force on the rock is 5 newtons, directed upward.
The 3 K background radiation represents
A) the formation of the first galaxies. B) the outer edge of the universe. C) the Big Bang itself. D) the time of decoupling. E) formation of the first quasar.
A giant star in another galaxy exploded 67 million years ago, forming a supernova. The event is observed by an astronomer on Earth
Estimate the speed at which the supernova (and its galaxy) recedes from Earth if the Hubble constant is 22 km/s per million light-years. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s) A) 4700 km/s B) 2700 km/s C) 1500 km/s D) 1200 km/s E) 670 km/s
The discovery of seafloor spreading led to acceptance of the theory of ______________
Fill in the blank(s) with correct word