The following images show four planets in our solar system. Rank these planets from left to right based on the number of moons that orbit them, from highest to lowest. (Not to scale.)
What will be an ideal response?
Answer:
Highest number to Lowest number:
Jupiter
Mars
Earth
Mercury
Feedback: Jupiter has many moons as a consequence of its formation, in which moons formed in a disk of material surrounding it and its extended atmosphere at the time allowed it to capture numerous small bodies into orbit. Mars has two very small moons that it presumably captured at a time when it, too, had an extended atmosphere. Earth's single but surprisingly large moon is thought to have formed as a result of a giant impact. Mercury (and Venus) have no moons.
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A current of 4.0 A is maintained in a single circular loop having a circumference of 80 cm. An external magnetic field of 2.0 T is directed so that the angle between the field and the plane of the loop is 20°. Determine the magnitude of the torque exerted on the loop by the magnetic forces acting upon it.
A. 0.41 N ? m B. 0.14 N ? m C. 0.38 N ? m D. 0.27 N ? m E. 0.77 N ? m
Which of the following is a unit of energy?
a. kilowatt-hour b. newton c. joules per second d. newton-second e. none of these
Sim-Planet: Make the difference between the night and day temperatures larger
A) Increase the tilt of the planet's rotation axis. B) Increase the greenhouse gas content of the planet's atmosphere. C) Move the planet closer to the Sun. D) Make the planet rotate more slowly.
Doubling the potential difference across a length of copper wire causes what change to the drift speed of the charge carriers?
1.No change occurs since drift speed is constant for copper. 2.The drift speed halves. 3.The drift speed doubles. 4.The drift speed quadruples.