11. an upward arrow labeled Fsin(40°), and a downward arrow labeled Fsin(40°) an
ID: 1397607 • Letter: 1
Question
11.
an upward arrow labeled Fsin(40°), and a downward arrow labeled Fsin(40°)
an upward arrow labeled Fcos(40°), and an eastward arrow labeled Fsin40°)
two eastward arrows, one labeled Fsin(40°) and the other labeled Fcos(40°)
an upward arrow labeled Fsin(40°), and an eastward arrow labeled Fcos(40°)
12.
What is the range of an ultrasonic sound?
below 20 Hz
below 10 Hz
between 20 Hz and 20,000 Hz
above 20,000 Hz
13.
At height h above the surface of Earth, the gravitational acceleration is 4.9 m/s2 .What is h? Note: The radius of Earth is 6380 km.
5280 km
1220 km
2640 km
3110 km
14.
As shown in the diagram, three objects are moving along a straight line. Taking the positive direction to be to the right, what is the total momentum of this system?
-106 kg?m/s
0 kg?m/s
+14.0 kg?m/s
+106 kg?m/s
-14.0 kg?m/s
15.
Only conservative forces perform work on an object over a span of time. During this time, the total mechanical energy of the object ______.
decreases
increases to a certain maximum
remains constant
increases continuously
11.
A child is walking eastward along a flat sidewalk. She is pulling a wagon behind her with pulling force applied to the handle. The handle makes an angle of 40° with the horizontal. Rather than drawing a slanted arrow in the free-body diagram for the wagon, which two arrows could be substituted for ?
an upward arrow labeled Fsin(40°), and a downward arrow labeled Fsin(40°)
an upward arrow labeled Fcos(40°), and an eastward arrow labeled Fsin40°)
two eastward arrows, one labeled Fsin(40°) and the other labeled Fcos(40°)
an upward arrow labeled Fsin(40°), and an eastward arrow labeled Fcos(40°)
12.
What is the range of an ultrasonic sound?
below 20 Hz
below 10 Hz
between 20 Hz and 20,000 Hz
above 20,000 Hz
Explanation / Answer
11) an upward arrow labeled Fsin(40°), and an eastward arrow labeled Fcos(40°)
12) above 20,000 Hz
13) 2640 km
14) -14.0 kgm/s
15) remains constant
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