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with the vertical. The work by the tension
13. A 50 kg child sits on a swing, which hangs on
ropes 5 m long. The child and swing are
released from rest at an angle of 60° to the
vertical. What is the combined tension in the
two ropes when the child is at the lowest
point? (g = 9.8 m/s2)
a. 100 N
b. 245 N
c. 490 N
d. 980 N Page 2 of 15 ©Prep101
14. A hockey puck stuck by a hockey stick is
given an initial speed of 10 m/s. If the
coefficient of friction between the ice and the
puck is 0.1, how far will the puck slide?
a. 39 m
b. 45 m
c. 51 m
d. 57 m
15. A Colour Doppler flow meter is used to
measure the speed of blood flow in an artery.
The speed of sound in blood is 1570.0 m s-1.
The transmitted frequency is f1 and the
frequency received at the detector is f2, where
f1 = 1.0005 f2. What is the measured average
blood flow speed?
a. 0.392 m/s away
b. 0.392 m/s toward
c. 0.432 m/s away
d. 0.432 m/s toward
16. In an ink-jet printer, an ink droplet of mass m
is given a negative charge q by a computercontrolled charging unit. It then enters at
speed v (see figure below) the region half-way
between two deflecting parallel plates of
length L separated by distance d. Throughout
this region a uniform downward electric field
exists. Neglecting the gravitational force on
the droplet, what is the maximum charge that
can be given to that droplet so that it does not
hit a plate? a.
d. mv 2 E
mv 2 d
E (vL )
dL 17. A particle (mass 6.7⋅10-27 kg, charge 3.2⋅1019
C) moves along the positive x axis at a
constant speed of 4.8⋅105 m/s. It enters a
region of uniform electric field parallel to its
motion and comes to rest after moving 2.0 m
into the field. What is the magnitude of the
electric field in kV/m?
18. A 0.1 kg steel ball is dropped straight down
onto a hard horizontal floor and bounces
straight up. Its speed just before and just after
impact with the floor is 10 m/s. Determine the
magnitude of the impulse delivere...
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- Spring '11