A proton moving eastward with a velocity of 5.0 × 103 m/s enters a magnetic field of 0.20 T pointing northward. What is the magnitude and direction of the force that acts on the proton?
A) 0 N
B) 1.6 × 10-16 N upwards
C) 1.6 × 10-16 N downwards
D) 1.1 × 10-16 N eastwards
E) 4.4 × 10-16 N westwards
B
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The ? ring eccentricity seems to be caused by the eccentric orbits of Ophelia and Cordelia around Jupiter
a. True b. False Indicate whether the statement is true or false
Electromagnetic waves are generally
A. standing waves. B. longitudinal waves. C. transverse waves. D. a 50/50 combination of transverse and longitudinal waves.
The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years
Suppose you have samples of both isotopes, and that they initially contain equal numbers of atoms of these isotopes. How will the activities (number of decays per second) of the samples compare? A) The activities will be equal. B) The activity of the cobalt-60 sample will be greater. C) The activity of the strontium-90 sample will be greater. D) The activities cannot be compared without more information.
In which one of the following flows must compressibility be considered?
(A) Flow around a commercial jet at takeoff (B) A category 5 hurricane (C) A Corvette at full-throttle on the Salt Lake Flats (D) Flow around the wing of a commercial aircraft in its approach to an airport