A home appliance is rated at 250. watts ic connected to 120. V
(a) What current does it draw?
(b) What is its resistance?
(c) How many kw-h does it use in one 24-hour day?
(a) 2.08 A
(b) 57.6 ?
(c) 6.00 kw-h
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You lift a book with your hand in such a way that it moves up at constant speed. While it is moving, what is the total work done on the book?
a) mg × ?r b) FHAND × ?r c) (FHAND + mg) × ?r d) zero e) none of the above
Saturn is less dense than water
Indicate whether the statement is true or false
The boundary shown is that of a uniform magnetic field directed in the positive z direction. An electron enters the magnetic field with a velocity pointing along the x axis and exits 0.63 ?s later at point A. What is the magnitude of the magnetic field?
a.
18 ?T
b.
14 ?T
c.
28 ?T
d.
34 ?T
e.
227 ?T
If the average wind speed for 24 hours is 15 mph at one site, but 10 mph for 12 hours and then 20 mph for 12 hours at another site, how much output can be expected from the same turbine situated at the first site compared to the second site?
a. three-quarters b. half c. one quarter d. one eighth e. same, since the average wind speeds are the same