Metric System: Express the sum 1.00 kg + 1531 g + 2.54 × 104 mg in kilograms with the correct number of significant figures.
A. 2.56 kg
B. 27.9 kg
C. 2.53 kg
D. 2.79 kg
Answer: A
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When an electric current exists within a conducting wire, which of the following statements describes the condition of any accompanying electric field?
a. must be zero b. must be parallel to current flow c. must be anti-parallel (opposite direction) to current flow d. must be perpendicular to current flow
Describe an order-of-magnitude estimate
What will be an ideal response?
A displacement vector D is given as 40.0 m long at an angle of 60.0 degrees EAST of NORTH. The 
component and the 
component of the vector are
A. 
= +34.6 m, 
= +20.0 m.
B. = +20.0 m, = -34.6 m.
C. = +20.0 m, = +34.6 m.
D. = -34.6 m,
= +20.0 m.
E. = +34.6 m,
= -20.0 m.
A car is rounding the top, or crest, of a hill while moving at a steady 50 km/hr. What can you say about this car's acceleration, and why?
A) The car is not accelerated, because neither its direction of motion nor its speed are changing. B) The car is accelerated, because its speed is changing. C) The car is not accelerated, because its speed is not changing. D) The car is not accelerated, because its direction of motion is not changing. E) The car is accelerated, because its direction of motion is changing.