Equilibrium: When a car is weighed, it is driven slowly on a horizontal floor over a scale that records a reading as the front wheels go over the scale, and then records a second reading as the rear wheels go over the scale. The weight of the car is equal to
A. the weight under the front wheels.
B. the weight under the rear wheels.
C. the average of the two weights.
D. the sum of the two weights.
E. the difference of the two weights.
Answer: D
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A 0.16 pF parallel-plate capacitor is charged to 10 V. Then the battery is disconnected from the capacitor. When 1.00 × 10^7 positive charges of magnitude |e| are now placed on the positive plate of the capacitor, the voltage between the plates changes by
a. ?5.0 V. b. ?1.1 V. c. 0 V. d. +1.1 V. e. +5.0 V.
Scientific equations in a conceptual course are mainly
A) recipes for plugging in numerical data. B) guides to thinking about the relationships between concepts. C) for mathematical problem solving. D) unfortunately a confusing way of explaining ideas.
An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 35 cm beyond the first, this second lens having a focal length of 8.0 cm. How far past the second lens is the final image formed?
A) 40 cm B) 35 cm C) 100 cm D) 6.5 cm E) 25 cm
The loop’s front end has emerged from the field.
A. forward (in the +x direction). B. backward (in the -x direction). C. zero. D. some other direction (specify).