Exam 7: Circular Motion and Gravitation

The record playing on the turntable of your stereo is rotating clockwise (as seen from above in Figure 7-5) Figure 7-5 The direction of the acceleration of point P (at the left) is

An astronaut goes out for a "space-walk" at a distance above the Earth equal to the radius of the Earth. Her acceleration will be

Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (no friction needed to stay on the run) for the smaller radius curve is V. Therefore, the safe speed on the larger radius curve is

A planet revolves clockwise around a star, with constant speed Figure 7-3 Which graph shows the direction of the planet's acceleration at point P: graph a, graph b, graph c, or graph d?

Consider a small satellite moving in a circular orbit (radius r) about a spherical planet (mass M). The period does not depend upon

Satellite A has twice the mass of satellite T, and rotates in the same orbit. Which of the following is true?

A jet plane flying 600. m/s experiences an acceleration of 4.0 g when pulling out of the dive. What is the radius of curvature of the loop in which the plane is flying?

The speed for a "low" circular orbit about the Earth is about

How does the escape speed from Mars compare with that of the Earth? [ M_Earth=9.31* M_Mars; R_Earth=1.88 *R_Mars]

James moves in a circular path (radius 15.0 m) with a speed of 60.0 m/s. His ANGULAR VELOCITY is

State Kepler's first law.

For a spherical planet to act like a "point mass", so that externally F = GmM/r², it

A future use of space stations may be to provide hospitals for severely burned persons. It is very painful for a badly burned person on Earth to lie in bed. In a space station, the effect of gravity can be reduced or eliminated. With what period of rotation would a doughnut-shaped hospital of 200. m radius have to rotate, if persons on the outer perimeter are to experience 1/10 the gravity effect of Earth?

Your starship, the TOP-QUARK, is in a counter-clockwise "parking orbit" around the planet VULCAN, as shown in Figure 7-6. Figure 7-6 In order to achieve escape velocity, the direction your retro-rockets should be facing is

A moon is in orbit around its mother planet. Which of the following statements is always true about its kinetic energy (K), and its gravitational potential energy (U)?

A car traveling 20 m/s rounds an 80 m radius horizontal curve with the tires on the verge of slipping. How fast can this car round a second curve of radius 320 m? (Assume the same coefficient of friction between the car's tires and each road surface.)

Europa, a moon of Jupiter, has an orbital diameter of 1.34 × 10⁹ m, and a period of 3.55 days. What is the mass of Jupiter?

A triangle has angles of 1.10 radians and 0.25 radians. What is the third angle, expressed in radians and in degrees?

How was Newton able to calculate the period of revolution of the Moon using his gravitation theory, even though he didn't know the value of G or the masses of the Earth and Moon?

Consider the planet Mars: [Earth mass = 6.0 × 10²⁴ kg = 9.3 × Mars mass; Earth radius = 6380.km = 1.89 × Mars radius] What is the acceleration of gravity on Mars?