Two identical spheres each carry a charge of ?82.0 µC. The spheres are separated by a distance of 2.00 m. What is the electric force between the spheres? (ke = 8.99 × 10^9 N·m2/C2)
a. 0.184 N (repulsive)
b. 15.1 N (repulsive)
c. 30.2 N (attractive)
d. 1.47 N (attractive)
e. 37.8 N (attractive)
b
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Do the constellations visible in the sky at a particular time of night (say 9 pm) follow a seasonal pattern?
a. No, the same constellations are visible at 9 pm on any clear night of the year. b. No. As the year progresses, the constellations visible at 9 pm are the same but their shapes change. c. Yes, at 9 pm during a clearwinter night ALL of the constellations you can see are different from the ones that appear at the same time during a summer night. d. Yes, at 9 pm during a summer night most of the constellations you can see are different from those you can see on a winter night. However, there are some constellations that are visible all year long.
What is the largest satellite (moon) in the Solar System?
A. Saturn's moon, Titan B. Neptune's moon, Triton C. Jupiter's moon, Ganymede D. Earth's moon
What is the usual symbol used to represent an amount of charge?
a. C b. q c. e d. none of the above
Sputnik I was launched into orbit around Earth in 1957. It had a perigee (the closest approach to Earth, measured from Earth's center) of 6.81 × 106 m and an apogee (the furthest point from Earth's center) of 7.53 × 106 m
What was its speed when it was at its perigee? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 7.18 × 103 m/s B) 7.84 × 103 m/s C) 8.23 × 103 m/s D) 11.0 × 103 m/s E) 13.4 × 103 m/s