Project a cannonball from atop Newton's hypothetical mountain at 8 km/s and it orbits Earth. Project it at 9 km/s and the shape of the orbit is
A) a somewhat larger circle.
B) a wide parabola.
C) an ellipse.
Answer: C
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Magnetic Field of a Long Wire: Three very long, straight, parallel wires each carry currents of 4.0 A, directed out of the page as shown in the figure. These wires pass through the vertices of a right isosceles triangle as shown. Assume that all the quantities shown in the figure are accurate to two significant figures. What is the magnitude of the magnetic field at point P at the midpoint of the hypotenuse of the triangle? (?0 = 4? × 10-7 T ? m/A)
A. 4.4 µT B. 18 µT C. 57 µT D. 130 µT E. 1.8 µT
How many nodes does a standing wave in a string have at the frequency of the sixth harmonic?
a. 12 c. 3 b. 6 d. The answer is not given.
Mass on a Spring: A 4.8-kg block attached to an ideal spring executes simple harmonic motion on a frictionless horizontal surface. At time t = 0.00 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2. The force constant (spring constant) of the spring is closest to
A. 15 N/m. B. 14 N/m. C. 13 N/m. D. 12 N/m. E. 11 N/m.
Which of the following best describes the lunar maria?
A) densely cratered regions on the Moon B) mountainous regions on the Moon C) frozen oceans of liquid water on the Moon D) relatively smooth, flat plains on the Moon