Physics Principles and Problems 2009

Chapter 6: Motion in Two Dimensions

Standardized Test Practice

1
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The diagram shows the trajectory of a ball that is thrown horizontally from the top of a building. The ball's vertical and horizontal velocity vectors, along with the resultant vectors, are also indicated. If the ball takes 1.2 s to reach the ground, what is the ball's vertical velocity when it reaches the ground?
A)9.8 m/s down
B)12 m/s down
C)8.2 m/s down
D)1.2 m/s down
2
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The diagram shows the trajectory of a ball that is thrown horizontally from the top of a building. If the ball's initial horizontal velocity is 2 m/s, and it takes 2 s to reach the ground, approximately how far from the building is the ball when it hits the ground?
A)4 m
B)0.9 m
C)25 m
D)21 m
3
In soccer, a record was set for kicking a soccer ball at 43 m/s. If the soccer player kicked the ball from ground level at an angle of 30.0° from the horizontal, what height would the ball reach? Assume that air resistance is negligible.
A)13 m
B)24 m
C)71 m
D)94 m
4
In soccer, a speed record was set for kicking a soccer ball at 43 m/s. If the soccer player kicked the ball from ground level at an angle of 30.0° from the horizontal, what would be the flight time of the soccer ball? Assume that air resistance is negligible.
A)2.2 s
B)3.0 s
C)4.4 s
D)5.9 s
5
On a circular race track with a radius of 3.23 km, a certain road car set a speed record of 372 km/hr. What was the car's centripetal acceleration?
  Need a Hint?
A)42.8 m/s2 inward
B)32.8 m/s2 inward
C)32.9 m/s2 inward
D)3.31 m/s2 inward
6
On a circular race track with a radius of 3.23 km, a certain road car set a speed record of 372 km/hr. If the car had a mass of 250 kg, what was the net force acting on it?
  Need a Hint?
A)0.83 N inward
B)4.8 N inward
C)830 N inward
D)8100 N inward
7
Calculate the speed of a 0.75 kg object that spins at the end of a 1.5-m length of yarn with a tension of 12 N.
  Need a Hint?
A)2.4 m/s
B)4.9 m/s
C)7.4 m/s
D)16 m/s
8
In track and field sports, the hammer throw event involves spinning a 4.0 kg weight at the end of a 1.2 m wire and releasing it at a maximum speed. Calculate the tension on the wire when the weight reaches a speed of 25 m/s.
A)83 N
B)120 N
C)2100 N
D)8300 N
9
How many revolutions are made by a bicycle wheel with a diameter of 66 cm that travels 75 m down a street?
  Need a Hint?
A)36
B)72
C)155
D)0.36
10
An eraser is thrown vertically upward and caught as it falls at the same height as it was thrown. If upwards is the positive direction, then what are the signs of the position, velocity and acceleration during the descending part of the trajectory of the eraser?
A)position: +
velocity: +
acceleration: -
B)position: +
velocity: -
acceleration: -
C)position: -
velocity: -
acceleration: -
D)position: +
velocity: -
acceleration: +
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