Energy Conservation With Conservative Forces: A 60-kg skier pushes off the top of a frictionless hill with an initial speed of 4.0 m/s. How fast will she be moving after dropping 10 m in elevation? Air resistance is negligible.
A. 0.20 km/s
B. 15 m/s
C. 10 m/s
D. 0.15 km/s
E. 49 m/s
Answer: B
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Kepler's first law of planetary motion implies that:
A) the planets move at constant speeds at all points in their orbits. B) all the planets move around Earth in elliptical orbits. C) uniform circular motion is adequate to describe the motion of all the planets. D) the planets move in elliptical orbits around the Sun.
Which event occurred at a redshift around 1100?
a. big bang b. inflation c. CMB d. first stars formed
Two long parallel wires separated by 4.0 mm each carry a current of 24 A. These two currents are in the same direction. What is the magnitude of the magnetic field at a point that is between the two wires and 1.0 mm from one of the two wires?
a. 4.8 mT b. 6.4 mT c. 3.2 mT d. 9.6 mT e. 5.3 mT
One number has three significant figures and another number has four significant figures. If these numbers are added, subtracted, multiplied, or divided, which operation can produce the greatest number of significant figures?
a. the addition b. the subtraction c. the multiplication d. the division e. All the operations result in the same number of significant figures.