An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 ?T, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the pitch of the resulting helical path?
a. 13 mm
b. 32 mm
c. 24 mm
d. 18 mm
e. 3.8 mm
d
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A baseball pitcher loosens up his pitching arm. He tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 24 m/s in a time of 0.40 s, what torque is applied to the ball while being held by the pitcher's hand to produce the angular acceleration?
a. 1.1 N•m c. 2.9 N•m b. 11 N•m d. 1.4 N•m
The gas in an HII region is ________ hydrogen
Fill in the blank(s) with correct word
When a switch is closed to complete a DC series RL circuit,
A. the electric field in the wires increases to a maximum value. B. the magnetic field outside the wires increases to a maximum value. C. the rate of change of the electric and magnetic fields is greatest at the instant when the switch is closed. D. all of the above are true. E. only (a) and (c) above are true.
The lengthening of the wavelength of a photon as it escapes from a gravitational field is known as__________
A) gravitational blueshift B) gravitational redshift C) photonic adaptation D) photon occultation