What is 56 + ( 32.00)/(1.2465 + 3.45 ) written with the correct number of significant figures?
A) 62.8
B) 62.812
C) 62.81
D) 63
E) 62.8123846
D
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The astronaut's experiment with the hammer and the feather illustrate that:
a. hammers and feathers have the same mass on the Moon. b. hammers and feathers have the same weight on the Moon. c. objects of different size, shape, and mass fall at the same rate in a vacuum. d. the absence of air on the Moon results in different rules of physics. e. there is no gravity on the Moon.
Dielectrics: A parallel-plate capacitor consists of a set of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference across the plates. A slab of a dielectric material is inserted in the region between the plates and completely fills it. What changes would you observe as the dielectric is inserted? (There could be more than one correct choice.)
A. Only the charge on the plates of the capacitor would change. B. Only the capacitance would change. C. Both the charge on the plates of the capacitor and its capacitance would change. D. The potential difference across the plates would increase. E. Nothing would change.
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 20.0 radians per seconds, then the period of the rotational motion is
A. 0.314 s. B. 0.441 s. C. 0.582 s. D. 0.698 s. E. 0.750 s.
Plants use energy from the sun to produce nutrients. Plants are therefore:
a. consumers b. reproducers c. producers d. decomposers e. developers