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d. The coefficient of static friction is
greater than 0.25 while the
coefficient of kinetic friction is less
than 0.25. ©Prep101
6. A woman stands on a bathroom scale in an
elevator which is not moving. The scale reads
500 N. The elevator then moves downward at
a constant velocity of 5 m/s. What does the
scale read while the elevator descends with
a. 100 N
b. 250 N
c. 450 N
d. 500 N 10. John and Jane are 10 m apart on an icy,
frictionless lake. Jane’s mass is 40 kg
excluding the 1 kg ball she holds. John’s mass
is 59 kg. Jane throws the ball to John with a
horizontal velocity of 10 m/s. How far apart
are Jane and John 10 s later?
a. 12 m
b. 13 m
c. 14 m
d. 15 m 7. A car enters a horizontal, curved roadbed of
radius 50 m. The coefficient of static friction
between the tires and the roadbed is 0.20.
What is the maximum speed with which the
car can safely negotiate the curve?
a. 4.5 m/s
b. 10 m/s
c. 20 m/s
d. 40 m/s 11. A car of mass 1500 kg is travelling around a
banked curve which is inclined at an angle of
15.0° above the horizontal. 8. A group of students need to cross a river in the
shortest time. The water in the river flows
downstream at a speed of 10m/s. The boat has
a maximum speed of 20m/s. In what direction
should be the students head the boat?
D irectly toward the opposite
63o away from downstream
9. Ying and Albert are carrying Faisal on a
horizontal stretcher. The stretcher is uniform,
is 2.0 m long, and weighs 100N. Faisal weighs
800N. Faisal’s centre of gravity is 75 cm from
Ying. Ying and Albert are at the ends of the
stretcher. The force that Albert is exerting to
support the stretcher with Faisal on it is:
a. 250 N
b. 300 N
c. 350 N
d. 450 N The car's path is circular with a radius of
curvature of 100 m. Assuming that the road
surface is frictionless, What is the speed of the
car such that it remains on the banked curve?
a. 16.2 m/s
b. 18.2 m/s
c. 20.5 m/s
d. 14.5 m/s
12. A simple pendulum consisting of a mass m
and string, swings upward, making an angle...
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This note was uploaded on 03/23/2011 for the course CHEM 100 taught by Professor Vallis during the Spring '11 term at Dalhousie.
- Spring '11