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
B
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a. 1.25 m/s c. 2.16 m/s b. 1.50 m/s d. 3.57 m/s
Three 2.50-?C charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the force on any one of the charges is
?
?
A. 1.88 × 10?2. B. 3.25 × 10?2. C. 3.73 × 10?2. D. 6.50 × 10?2. E. 7.50 × 10?2.
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A) 36.9° N of E B) 42.0° N of E C) 45.0° N of E D) 53.1° N of E E) 48.0° N of E