Alpha particles, each having a charge of +2e and a mass of 6.64 ×10-27 kg, are accelerated in a uniform 0.80-T magnetic field to a final orbit radius of 0.30 m
The field is perpendicular to the velocity of the particles. How long does it take an alpha particle to make one complete circle in the final orbit? (e = 1.60 × 10-19 C)
A) 0.33 ?s B) 0.40 ?s C) 0.15 ?s D) 0.49 ?s E) 0.25 ?s
C
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A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together
(a) What is the speed of the wreckage just after the collision? (b) In what direction does the wreckage move just after the collision?
Adisa pulls a 35.0-N crate up a 4.00-m-long inclined plane at a constant velocity. If the plane is inclined at an angle of 39.0° to the horizontal and there is a constant force of friction of 13.0 N between the crate and the surface, what is the net change in potential energy of the crate?
a. 88 J b. ?88 J c. 109 J d. ?109 J e. None of these
Doubling the number of loops of wire in a coil produces what kind of change on the induced emf, assuming all other factors remain constant?
A) The induced emf is 4 times as much. B) There is no change in the induced emf. C) The induced emf is twice as much. D) The induced emf is times as much. E) The induced emf is 3 times as much.
During a period of high solar activity, most sunspots lie near the Sun's ________
Fill in the blank(s) with correct word