An electron has an initial velocity to the south but is observed to curve upward as the result of a magnetic field. This magnetic field must have a component
A) to the west.
B) to the east.
C) upward.
D) downward.
E) to the north.
A
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The cosmological principle states that any observer in any galaxy will see the same general features of the Universe
a. True b. False Indicate whether the statement is true or false
Angular Momentum: An ice skater has a moment of inertia of 5.0 kg ? m2 when her arms are outstretched, and at this time she is spinning at 3.0 rev/s. If she pulls in her arms and decreases her moment of inertia to 2.0 kg ? m2, how fast will she be spinning?
A. 2.0 rev/s B. 3.3 rev/s C. 7.5 rev/s D. 10 rev/s
Impacts were extremely common in the young solar system but no longer occur today
Indicate whether the statement is true or false
The main form of radiation that our bodies emit is
a. ultraviolet b. infrared c. x ray d. microwave e. blackbody