A particle of charge q travels with velocity v in the same direction as the magnetic field, B. What is the force exerted on the charge?
1. qvB, in the direction of the magnetic field
2. qvB, in the direction opposite that of the magnetic field
3. qvB, in a direction perpendicular to the magnetic field and the velocity
4. zero
4
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Impulse: Calculate the impulse due to a force of 4.5 N that lasts for 1.4 s.
A. 6.3 kg? m/s B. 5.0 kg? m/s C. 5.7 kg? m/s D. 6.9 kg? m/s
We can learn a lot about the properties of a star by studying its spectrum. All of the following statements are true except one. Which one?
A) The peak of the star's thermal emission tells us its temperature: Hotter stars peak at shorter (bluer) wavelengths. B) The total amount of light in the spectrum tells us the star's radius. C) We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals. D) We can look at Doppler shifts of spectral lines to determine the star's speed toward or away from us.
True or False: While discharging, the terminal voltage of a battery can never be greater than the emf of the battery
1.False 2.True
Why are glacial striations so important?
What will be an ideal response?