All stars ignite helium fusion as part of the aging process
a. True
b. False
Indicate whether the statement is true or false
False
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A pocket of air moving north in the Northern Hemisphere will be deflected ________ by the rotation of Earth.
A. to the south B. upward to a higher altitude C. to the west D. to the east E. downward toward the surface
Banked Curves: A highway curve of radius 100 m, banked at an angle of 45°, may be negotiated without friction at a speed of
A. 22 m/s. B. 31 m/s. C. 44 m/s. D. 67 m/s.
A uniform 2.00-kg circular disk of radius 20.0 cm is rotating clockwise about an axis through its center with an angular speed 30.0 revolutions per second
A second uniform 1.50-kg circular disk of radius 15.0 cm that is not rotating is dropped onto the first disk so that the axis of rotation of the first disk passes through the center of the second disk. What is the final angular speed of the two disks when they are rotating together? A) 16.9 revolutions per second B) 19.2 revolutions per second C) 21.1 revolutions per second D) 17.1 revolutions per second E) 12.7 revolutions per second
Circular Motion of Charges: An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 107 m/s. What is the radius of the circle? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A. 1.5 mm B. 0.22 mm C. 2.2 mm D. 0.39 mm E. 3.9 mm