Two loops of wire are arranged so that a changing current in one, the primary, will induce a current in the other, the secondary. The secondary loop has twice as many turns as the primary loop. The current in the primary at this moment is 3 A and increasing. The current in the secondary must be
a. 3 A.
b. 6 A.
c. zero.
d. There is insufficient information to work this problem.
d
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Free Fall: An object is dropped from a bridge. A second object is thrown downwards 1.0 s later. They both reach the water 20 m below at the same instant. What was the initial speed of the second object? Neglect air resistance.
A. 4.9 m/s B. 15 m/s C. 9.9 m/s D. 20 m/s E. 21 m/s
How is the mass hung on the spring related to the force that actually stretches the spring?
The maximum possible value for the coefficient of static friction is:
a. 0.50 c. a value up to but not quite 1.00 b. 1.00 d. greater than 1.00
Consider an asteroid that orbits the Sun once every 5 years. Does this object ever cross the Earth's orbital path?
1.Yes, it must cross twice every five earth years. 2.No, it can never cross Earth’s orbital path. 3.Yes, it must cross once every Earth year. 4.It is impossible to tell.