What can contribute to a planet losing its atmosphere?
A) thermal escape
B) large impacts
C) solar wind stripping
D) all of these
D
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Four electrons move from point A to point B in a uniform electric field as shown below. Rank the electrons in diagrams I through IV by the changes in potential from most positive to most negative when traveling from A to B.
A. I = II = III = IV. B. II = III > I > IV. C. III > I = IV > II. D. II > I = IV > III. E. I > II = III > IV.
A 340-g air track cart traveling at 1.25 m/s collides elastically with a 300-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the 300-g cart after the collision?
A) 2.80 m/s B) 0.0693 m/s C) 0.899 m/s D) 1.41 m/s E) 0.475 m/s
By how many decibels does the intensity level of a sound decrease when you triple your distance from a source of sound?
A) 12 dB B) 6.0 dB C) 4.8 dB D) 3.0 dB E) 9.5 dB
A coaxial cable consists of an inner cylindrical conductor of radius R1 = 0.040 m on the axis of an outer hollow cylindrical conductor of inner radius R2 = 0.080 m and outer radius R3 = 0.090 m
The inner conductor carries current I1 = 4.40 A in one direction, and the outer conductor carries current I2 = 7.70 A in the opposite direction. What is the magnitude of the magnetic field at the following distances from the central axis of the cable? (?0 = 4? × 10-7 T ? m/A) (a) At r = 0.060 m (in the gap midway between the two conductors) (b) At r = 0.150 m (outside the cable)