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

Physics & Space Science

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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

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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

Physics & Space Science