A ball is attached to a string and revolves in a horizontal circle with angular momentum. When the string breaks at point B on the circumference, the ball moves off tangentially along path B-Q
As it moves along B-Q, increasing its distance from the center of the circle, its angular momentum A) decreases.
B) is now zero.
C) remains constant.
D) increases.
C
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The heliocentric model was actually first proposed by
A) Aristotle. B) Archimedes. C) Aristarchus. D) Alexander the Great. E) Hipparchus.
A circular loop of wire of cross-sectional area 0.12 m2 consists of 200. turns, each carrying 0.50 A. It is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What torque acts on the loop?
What will be an ideal response?
Two electrons are separated by one cm. What is the ratio of the electric force to the gravitational force between them? (me = 9.11 × 10^-31 kg, ke = 8.99 × 10^9 N×m2/C2, G = 6.67 × 10^-11 N×m2/kg2, and e = 1.6 × 10^-19 C)
a. 1.3 × 10^20 c. 2.3 × 10^2 b. 4.2 × 10^42 d. 3.1 × 10^22
Compared with the buoyant force of the atmosphere on a 1-liter helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-liter solid iron block is
A) considerably less. B) considerably more. C) the same.