A planet has two identical moons with identical mass. Moon 1 is in a circular orbit of radius r. Moon 2 is in a circular orbit of radius 2r. The magnitude of the gravitational force exerted by the planet on Moon 2 is
1.four times as large as the gravitational force exerted by the planet on Moon 1.
2.twice as large as the gravitational force exerted by the planet on Moon 1.
3.the same as the gravitational force exerted by the planet on Moon 1.
4.half as large as the gravitational force exerted by the planet on Moon 1.
5.one-fourth as large as the gravitational force exerted by the planet on Moon 1.
5
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At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?
A. 3.8 m/s B. 3.4 m/s C. 5.0 m/s D. 4.4 m/s E. 4.6 m/s
Only low mass stars experience the temporary instability of the helium flash; high mass stars go directly into heavier element formation
Indicate whether the statement is true or false
A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 30° above the horizontal. What is the angular acceleration of the rod at the instant it is released?
a. 4.7 rad/s2 b. 6.9 rad/s2 c. 6.4 rad/s2 d. 5.6 rad/s2 e. 4.2 rad/s2
Two solid spheres, both of radius 5 cm, carry identical total charges of 2 µC. Sphere A is a good conductor. Sphere B is an insulator, and its charge is distributed uniformly throughout its volume. How do the magnitudes of the electric fields they separately create at radius 4 cm compare?
1. EA > EB = 0 2. EA > EB > 0 3. EA = EB > 0 4. 0 < EA < EB 5. 0 = EA < EB