On average, how fast do the plates move on the Earth?
A) a few centimeters per year
B) a few millimeters per century
C) about 1 mile per hour
D) a few kilometers per year
A) a few centimeters per year
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A 600-kg car makes a 90° turn. Its speed before the turn is 21.0 m/s and after the turn it is 24.0 m/s. What is the magnitude of the change in the car's momentum?
A) 19.1 × 103 kg?m/s B) 10.2 × 103 kg?m/s C) 9.55 × 103 kg?m/s D) 12.0 × 103 kg?m/s E) 22.2 × 103 kg?m/s
Which of the following is the largest?
a. the diameter of Earth b. the diameter of the Moon c. the diameter of the Sun d. the diameter of Jupiter e. the distance from Earth to the Sun
________ occur(s) because photons we receive from the edge of the solar disk are emitted further from the base of the photosphere than the photons we receive from the center of the solar disk
a. The Zeeman Effect b. Sunspots c. Solar flares d. Solar prominences e. Limb darkening
Which statement regarding the force of a magnetic field on a current-carrying wire is true?
a. The magnetic force on the wire is independent of the direction of the current. b. The force on the wire is directed parallel to both the wire and the magnetic field. c. The force takes its largest value when the magnetic field is parallel to the wire. d. All of the above statements are false.