Which is the correct expression for rotational kinetic energy?
a. Half of the rotational inertia times the square of the rotational speed.
b. The mass times the speed times the radius.
c. The mass times velocity.
d. Half of the mass times the square of the speed.
e. The force times the distance.
a
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If all the components of a vector are equal to 1, then that vector is a unit vector
A) True B) False
In a dream you're in a car traveling at 50 km/h and you bump into another car traveling toward you at 48 km/h. The speed of impact is
A) 48 km/h. B) 50 km/h. C) 98 km/h. D) 2400 km/h.
Dimensional Analysis: When dividing several quantities
A. the quantities can have any combination of units. B. the quantities must all have exactly the same units. C. the quantities must all be dimensionless.
List the terrestrial planets in decreasing order of their mass.
A. Venus, Earth, Mars, Mercury B. Mercury, Venus, Earth, Mars C. Mercury, Mars, Venus, Earth D. Earth, Venus, Mars, Mercury