Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds.What is the work done by the force?
a. 150 J
b. 50 J
c. 75 J
d. undetermined—not enough information given
e. none of the above
d
RATIONALE: If one were told the object's initial velocity then one could calculate the work done by using the equations for constant acceleration to find the distance traveled.
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At a given location in space, the potential is known to be greater when one moves in any direction. To be more specific, no matter which direction one goes, a small step in that direction results in an increase in the potential by the same amount. This means that the Electric field at this location is
A. Can take on any value at all. B. Zero C. Negative D. Positive
Carbon-14 Dating: An archaeologist finds the 14C in a sample of 2.10 g of material to be decaying at 107 Bq. A modern 1.00-g sample of the same material decays at 151 Bq,and assume this rate has also held in the past. The half-life of 14C is 5730 years. How old is the sample?
A. 8980 years B. 6230 years C. 17,000 years D. 8530 years
For absorption spectra to exist
A) the light source must be a gas. B) partially absorbent material must exist between the light source and the spectroscope slit. C) the spectroscope must be equipped with an absorption cell. D) all of the above E) none of the above
A parallel-plate capacitor has plates of area 0.40 m2 and plate separation of 0.20 mm. The capacitor is connected across a 9.0-V potential source. (?0 = 8.85 × 10-12 C2/N • m2)
(a) What is the magnitude of the electric field between the plates? (b) What is the capacitance of the capacitor? (c) What is the magnitude of the charge on each plate of the capacitor?