Your weight is 120 lb. Suppose you are standing on a scale in an elevator moving up with a constant speed of 4 m/s. What would be the reading on the scale?
A. 30 lb.
B. 0
C. 120 lb.
D. 480 lb.
E. 70 lb.
Answer: C
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How would an increase in friction between the glider and the air track affect the calculated value of g?
A light-emitting diode has a power output of 0.3 W. If 590 nm is the average wavelength of the source, about how many photons are emitted per second? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 1021 b. 1025 c. 1018 d. 1029
If all the components of a vector are equal to 1, then that vector is a unit vector
A) True B) False
Graphical Addition: Refer to the figure, which shows four vectors 
,
, 
, and 
.
(a) Vector 
as
expressed in terms of vectors 
and 
is given byA) 
+ 
.B) 
- 
.C) 
- 
.(b) Vector 
as expressed in terms of vectors 
and 
is given byA) 
+ 
.B) 
- 
.C) 
- 
.
Fill in the blank(s) with the appropriate word(s).