To determine the location of the center of mass of a car, the car is driven over a scale on a horizontal floor
When the front wheels are over the scale, the weight recorded by the scale is 5800 N, and when the rear wheels are over the scale, the scale reads 6500 N. The distance between the front and rear wheels is measured to be 3.20 m. How far behind the front wheels is the center of mass located? A) 0.845 m
B) 1.50 m
C) 1.59 m
D) 1.69 m
E) 1.72 m
D
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Coulomb's Law: Four point charges Q of equal magnitude and sign are arranged on three of the corners of the square of side d as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the upper right hand corner of the square?
A. A B. B C. C D. D
Two identical freight cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple together, and roll away in the direction of
A) the slower car. B) the faster car. C) neither, for they stop.
Which of the following is not a piece of evidence supporting the idea that an impact caused the mass extinction that occurred 65 million years ago?
A) Fossilized dinosaur bones contain fragments of rock from the impact. B) Unusually large abundances of iridium and other rare metals are found in a layer of clay that dates to 65 million years ago. C) A large impact crater along the coast of Mexico dates to 65 million years ago. D) Grains of quartz formed under high pressure are found in a layer of clay that dates to 65 million years ago.
Today we rely largely on what technique to precisely measure distances in the solar system?
A) Transits of Venus across the Sun B) Radar echo timings C) Measurement of stellar parallaxes. D) Timings of the eclipses of its moons by Jupiter's shadow E) Precise measurements of length of the year with atomic clocks