Gaps in the asteroid belt (often called Kirkwood gaps) are caused by
A) tidal forces from the Sun.
B) tidal forces from Jupiter.
C) the competing gravitational tugs of Mars and Jupiter.
D) orbital resonances with Jupiter.
D
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The magnetic field in a region of space is parallel to the surface of a long flat table. Imagine that this page is lying flat on the table. When current is present in the coil, which is lying on the table, the coil tends to rotate so that the left side moves up and the right side moves down. The magnetic field is
A. directed parallel to the page and downwards. B. directed parallel to the page and upwards. C. directed parallel to the page and to the right. D. directed parallel to the page and to the left. E. in a direction that cannot be determined in this experiment
LC Circuits: What size capacitor must be placed in series with a 40-mH coil so the circuit will oscillate with a frequency of 1000 Hz?
A. 0.63 ?F B. 0.50 ?F C. 0.22 ?F D. 0.17 ?F
A light-year is
A) about 10 trillion kilometers. B) the time it takes light to reach the nearest star. C) the time it takes light to travel around the Sun. D) about 300,000 kilometers per second.
An electron moves with a speed of 8.0 × 106 m/s along the +x-axis
It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. (1 eV = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg) Calculate the magnitude of (a) the magnetic force on the electron. (b) the acceleration of the electron. What will be an ideal response?