Download Course Review 2

1/14/13
Name: __________
Physics 20 Course Review
Page 2
Date: ___________
Unit B:
A demolition ball has a mass of 500 kg and hangs on a steel wire but is pulled over to the right
by a horizontal rope.
420
500 kg
Rope
If the wire is inclined at an angle of 420 to the vertical then the force in the rope required to keep
the ball in equilibrium is about:
A. 4.4 kN
B. 4.9 kN
C. 5.3 kN
D. 6.6 kN
Unit C:
In a circus act Bimbo, The Human Cannonball, is fired from the muzzle of a cannon that is
angled at 600 to the horizontal and sits 3.0 m from the floor.
If Bimbo has a mass of 65 kg and leaves the muzzle
of the cannon at a velocity of 20 m/s the mechanical energy
his body will possess at any time during the flight
will be about:
A. 5.1 kJ
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B. 11.6 kJ
C. 22.8 kJ
3m
600
D. 14.9 kJ
1/14/13
Unit A:
In the previous question the gun barrel is 3.2 m long. If Bimbo’s acceleration along the barrel is
constant during the firing, what acceleration does he experience in “g’s”? (One ‘g’ equals an
acceleration of 9.81 m/s2)
A. 5.7 g
B. 6.4 g
C. 7.3 g
D. 9.8 g
Unit D:
A musical instrument produces sound waves with a wavelength of 60 cm on a cold day when the
speed of sound is 310 m/s. On the next day it is very warm and the speed of sound has changed
to 360 m/s. The wavelength produced by the same note played on the same instrument will be
about:
A. 0.70 m
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B. 0.85 m
C. 1.1 m
D. 1.95 m