According to Kepler, the line from the Sun to any planet sweeps out equal areas of space
A) with each complete revolution.
B) only when the paths are ellipses.
C) in equal time intervals.
Answer: C
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A pole-vaulter clears 5.00 m. With what speed does he strike the mat in the landing area?
a. 2.70 m/s c. 10.8 m/s b. 9.90 m/s d. 21.6 m/s
When a positive charge q is placed in the field created by two other charges Q1 and Q2, each a distance r away from q, the acceleration of q is
a. in the direction of the charge Q1 or Q2 of smaller magnitude. b. in the direction of the charge Q1 or Q2 of greater magnitude. c. in the direction of the negative charge if Q1 and Q2 are of opposite sign. d. in the direction of the positive charge if Q1 and Q2 are of opposite sign. e. in a direction determined by the vector sum of the electric fields of Q1 and Q2.
A proton is accelerated from rest through 500 V. It enters a magnetic field of 0.30 T oriented perpendicular to its direction of motion. Determine the radius of the path it follows
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Terrence goes for a walk. He walks 2.0 km north, then turns and walks 4.0 km south of east. What is his displacement vector? Take east to be in the +-direction and north to be in the +-direction.
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