Questions from Modern Physics

Q: Rhea, one of Saturn’s moons, has a radius of 764

Rhea, one of Saturn’s moons, has a radius of 764 km and an acceleration due to gravity of 0.265 m/s2 at its surface. Calculate its mass and average density.

Q: Calculate the earth’s gravity force on a 75-kg astronaut who

Calculate the earth’s gravity force on a 75-kg astronaut who is repairing the Hubble Space Telescope 600 km above the earth’s surface, and then compare this value with his weight at the earth’s surfac...

Q: Jupiter’s moon Io has active volcanoes (in fact, it is

Jupiter’s moon Io has active volcanoes (in fact, it is the most volcanically active body in the solar system) that eject material as high as 500 km (or even higher) above the surface. Io has a mass of...

Q: Use the results of Example 13.5 (Section 13.

Use the results of Example 13.5 (Section 13.3) to calculate the escape speed for a spacecraft (a) from the surface of Mars and (b) from the surface of Jupiter. Use the data in Appendix F. (c) Why is t...

Q: Ten days after it was launched toward Mars in December 1998,

Ten days after it was launched toward Mars in December 1998, the Mars Climate Orbiter spacecraft (mass 629 kg) was 2.87 × 106 km from the earth and traveling at 1.20 × 104 km/h relative to the earth....

Q: A glider is attached to a fixed ideal spring and oscillates on

A glider is attached to a fixed ideal spring and oscillates on a horizontal, friction-free air track. A coin rests atop the glider and oscillates with it. At what points in the motion is the friction...

Q: A planet orbiting a distant star has radius 3.24 ×

A planet orbiting a distant star has radius 3.24 × 106 m. The escape speed for an object launched from this planet’s surface is 7.65 × 103 m/s. What is the acceleration due to gravity at the surface o...

Q: In the Cavendish balance apparatus shown in Fig. 13.4

In the Cavendish balance apparatus shown in Fig. 13.4, suppose that m1 = 1.10 kg, m2 = 25.0 kg, and the rod connecting the m1 pairs is 30.0 cm long. If, in each pair, m1 and m2 are 12.0 cm apart cente...

Q: An earth satellite moves in a circular orbit with an orbital speed

An earth satellite moves in a circular orbit with an orbital speed of 6200 m/s. Find (a) the time of one revolution of the satellite; (b) the radial acceleration of the satellite in its orbit.

Q: For a satellite to be in a circular orbit 890 km above

For a satellite to be in a circular orbit 890 km above the surface of the earth, (a) what orbital speed must it be given, and (b) what is the period of the orbit (in hours)?