Friction: Jason takes off across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible). The skis produce a forward thrust of 200 N and have a coefficient of kinetic friction with water of 0.10. Unfortunately, the skis run out of fuel after only 41 s. How far from his starting point has Jason traveled when he finally coasts to a stop?
A. 3900 m
B. 2900 m
C. 2000 m
D. 1400 m
Answer: A
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Potential of Point-Charges: Four point charges of magnitude 6.00 ?C and are at the corners of a square 2.00 m on each side. Two of the charges are positive, and two are negative. What is the electric potential at the center of this square, relative to infinity, due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 76.4 kV B. 0 V C. 153 kV D. 61.0 kV E. 306 kV
A particle is moving at constant velocity. Its position at t = 1.0 s is 3.0 m and its position at t = 4.0 s is 15.0 m. What is the slope of the position-time graph for this particle?
a. 0, since this is a constant velocity situation. b. 4.0 m/s c. 4.0 m/s2 d. 9.0 m/s e. 12 m/s2
The ideal shape for the primary mirror of a telescope is
a. concave circular. b. convex circular. c. concave parabolic. d. convex parabolic. e. plane.
How would a compass needle align itself in the magnetic field shown in this figure?
a. It would align itself along the magnetic field lines circling the wire, with the north pole of the compass pointing clockwise. b. It would align itself along the magnetic field lines circling the wire, with the north pole of the compass pointing counterclockwise. c. The compass needle aligns perpendicular to the magnetic field with its north pole pointing directly at the wire. d. The compass needle aligns perpendicular to the magnetic field with its north pole pointing directly away from the wire. e. The direction the compass tends to point is up out of the page, but it cannot rotate that way, and it therefore does not respond to the magnetic field.