"Cosmological Redshift" refers to
A) the expansion of space itself.
B) the expansion of galaxies.
C) the expansion of red giants.
D) the tendency of light to expand when free of gravitational influences.
Answer: A
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A person would like to pull a car out of a ditch. This person ties one end of a chain to the car’s bumper and wraps the other end around a tree so that the chain is taut. The person then pulls on the chain perpendicular to its length, as shown in the picture. The magnitude of the force that the chain exerts on the car in this situation is
A. Much smaller than the force the person exerts on the chain. B. About equal to the force the person exerts on the chain. C. Much bigger than the force the person exerts on the chain.
Addition of a metal slab of thickness a between the plates of a parallel plate capacitor of plate separation d is equivalent to introducing a dielectric with dielectric constant ? between the plates. The value of ? is
A.
.B.
C.
D.
.E.
.The _____ are the genetic material in a cell
A) chloroplasts B) centrioles C) lysosomes D) chromosomes
A weight lifter can bench press How many milligrams (mg) is this?
A) 1.71 × 108 mg B) 1.71 × 109 mg C) 1.71 × 107 mg D) 1.71 × 106 mg