If a current of 2.4 A is flowing in a wire of diameter 2.0 mm, what is the average current density?
A)
7.6 × 105 A/m2
B)
5.2 × 10-6 A/m2
C)
1.9 × 105 A/m2
D)
3.6 × 105 A/m2
E)
21 × 10-6 A/m2
A
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A 0.30-kg mass attached to the end of a string swings in a vertical circle (R = 1.6 m), as shown. At an instant when ? = 50°, the tension in the string is 8.0 N. What is the magnitude of the resultant force on the mass at this instant?
a.
5.6 N
b.
6.0 N
c.
6.5 N
d.
5.1 N
e.
2.2 N
In the first second of the universe, the universe cooled and inflated. A result is a separation of one unified force into four distinct forces
a. True b. False Indicate whether the statement is true or false
A piece of glass that appears red
A) absorbs or reflects all colors except red. B) transmits red. C) both of these D) neither of these
The reason that small planets tend to lose interior heat faster than larger planets is essentially the same as the reason that ________
A) Earth contains more metal than the Moon B) a large baked potato takes longer to cool than a small baked potato C) thunderstorms tend to form on hot summer days D) gas bubbles form and rise upward in boiling water