If a mile of 24-gauge copper wire has a resistance of 0.14 kW and the resistivity of copper is 1.7 × 10^-8 W × m, what is the diameter of the wire? (1 mile = 1.6 km)
a. 0.40 mm
b. 0.50 mm
c. 0.63 mm
d. 0.80 mm
e. 0.25 mm
B
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A 1.65 nC charge experiences an acceleration of 
in an electric field. What is the magnitude of the electric field?
A. 
B. 
C. 14.9 N/C
D. 
E. there isn't enough information in the problem to solve this
Suppose a box contains about 5.0 × 10^21 hydrogen atoms at room temperature (21°C). Determine the thermal energy of these atoms
a. 10 J b. 20 J c. 30 J d. 5.0 J e. 1.0 J
How much heat is necessary to change 10 g of water at 30°C into steam at 100°C?
a. 0.07 kcal b. 0.7 kcal c. 6.1 kcal d. 0.67 kcal
A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s2 down the incline. Determine the magnitude of the force of friction acting on the block
a. 4.2 N b. 3.0 N c. 3.4 N d. 3.8 N e. 2.3 N