Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. The work you do is
a. 0 c. 100 J
b. 4 J d. none of the above
C
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A 10-V-emf battery is connected in series with the following: a 2-µF capacitor, a 2.0-? resistor, an ammeter, and a switch, initially open; a voltmeter is connected in parallel across the capacitor. At the instant the switch is closed, what are the current and capacitor voltage readings, respectively?
a.
zero A, 10 V
b.
zero A, zero V
c.
5 A, zero V
d.
5 A, 10 V
The Moon's redness during a lunar eclipse is due to
A) light of lower frequencies reflected from the Moon. B) excess infrared radiation. C) an optical illusion. D) refracted light from Earth's sunrises and sunsets. E) none of the above
For the stem of the total hip replacement we discussed in Section 14.3.3, assume that the hip replacement is to go into a lightweight, frail person, and therefore the weight of the stem is critical. Use the data in Table 14.14 to determine the material with the highest relative merit for this application.
What will be an ideal response?
An object's _____ is the force that Earth's gravity exerts on the object
A) mass B) density C) weight D) volume