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Choose the correct answer for each question.

- magnitude, only
- direction, only
- both magnitude and direction
- neither magnitude nor direction

**A car travels 90. meters due north in 15 seconds. Then the car turns around and travels 40. meters due south in 5.0 seconds. What is the magnitude of the average velocity of the car during this 20.-second interval?**- 2.5 m/s
- 5.0 m/s
- 6.5 m/s
- 7.0 m/s

**How far will a brick starting from rest fall freely in 3.0 seconds?**- 15 m
- 29 m
- 44 m
- 88 m

**If the sum of all the forces acting on a moving object is zero, the object will**- slow down and stop
- change the direction of its motion
- accelerate uniformly
- continue moving with constant velocity

- 1.0 N
- 2.0 N
- 5.0 N
- 50. N

- acceleration due to gravity
- universal gravitational constant
- momentum of objects
- weight of objects

**A 1,200-kilogram car traveling at 10. meters per second hits a tree and is brought to rest in 0.10 second. What is the magnitude of the average force acting on the car to bring it to rest?****A spring scale reads 20. newtons as it pulls a 5.0-kilogram mass across a table. What is the magnitude of the force exerted by the mass on the spring scale?**- 49 N
- 20. N
- 5.0 N
- 4.0 N

- toward the center of the circular curve
- away from the center of the circular curve
- tangent to the curve in the direction of motion
- tangent to the curve opposite the direction of motion

- decrease
- increase
- remain the same

**The amount of work done against friction to slide a box in a straight line across a uniform, horizontal floor depends most on the**- time taken to move the box
- distance the box is moved
- speed of the box
- direction of the box’s motion

- 1.4 m/s
- 2.0 m/s
- 3.0 m/s
- 3.6 m/s

**An object weighs 100. newtons on Earth’s surface. When it is moved to a point one Earth radius above Earth’s surface, it will weigh**- 25.0 N
- 50.0 N
- 100. N
- 400. N

**An object weighing 15 newtons is lifted from the ground to a height of 0.22 meter. The increase in the object’s gravitational potential energy is approximately**- 310 J
- 32 J
- 3.3 J
- 0.34 J

**As an object falls freely, the kinetic energy of the object**- decreases
- increases
- remains the same

- 24 W
- 32 W
- 48 W
- 96 W

**Which graph best represents the electrostatic force between an alpha particle with a charge of +2 elementary charges and a positively charged nucleus as a function of their distance of separation?****When a neutral metal sphere is charged by contact with a positively charged glass rod, the sphere**- loses electrons
- gains electrons
- loses protons
- gains protons

**If 10. coulombs of charge are transferred through an electric circuit in 5.0 seconds, then the current in the circuit is**- 0.50 A
- 2.0 A
- 15 A
- 50. A

- It is zero at point B.
- It is a maximum at point B.
- It is a maximum at point C.
- It is the same at points A, B, and C.

**A periodic wave transfers**- energy, only
- mass, only
- both energy and mass
- neither energy nor mass

**As the potential difference across a given resistor is increased, the power expended in moving charge through the resistor**- decreases
- increases
- remains the same

**An electric iron operating at 120 volts draws 10. amperes of current. How much heat energy is delivered by the iron in 30. seconds?****A motor is used to produce 4.0 waves each second in a string. What is the frequency of the waves?**- 0.25 Hz
- 15 Hz
- 25 Hz
- 4.0 Hz

- A and C
- A and D
- B and C
- C and D

**A surfacing whale in an aquarium produces water wave crests having an amplitude of 1.2 meters every 0.40 second. If the water wave travels at 4.5 meters per second, the wavelength of the wave is**- 1.8 m
- 2.4 m
- 3.0 m
- 11 m

- crown glass
- flint glass
- glycerol
- water

**A radar gun can determine the speed of a moving automobile by measuring the difference in frequency between emitted and reflected radar waves. This process illustrates**- resonance
- the Doppler effect
- diffraction
- refraction

- a node resulting from constructive interference
- a node resulting from destructive interference
- an antinode resulting from constructive interference
- an antinode resulting from destructive interference

**One watt is equivalent to one****Which pair of forces acting concurrently on an object will produce the resultant of greatest magnitude?**- decreases
- increases
- remains the same

**The mass of a high school football player is approximately****A constant force is used to keep a block sliding at constant velocity along a rough horizontal track. As the block slides, there could be an increase in its**- gravitational potential energy, only
- internal energy, only
- gravitational potential energy and kinetic energy
- internal energy and kinetic energy

**A photon of which electromagnetic radiation has the most energy?**- ultraviolet
- x ray
- infrared
- microwave

**The spring of a toy car is wound by pushing the car backward with an average force of 15 newtons through a distance of 0.50 meter. How much elastic potential energy is stored in the car’s spring during this process?**- 1.9 J
- 7.5 J
- 30. J
- 56 J

- 1.3 A
- 1.5 A
- 3.0 A
- 0.75 A

- ↑
- ↓
- →
- ←

**Which graph best represents the motion of a block accelerating uniformly down an inclined plane?**- smaller
- larger
- the same

- 1 A
- 2 A
- 3 A
- 4 A

**The diagram below represents a light ray traveling from air to Lucite to medium Y and back into air.**- 0.333
- 0.500
- 0.707
- 0.886

**The diagram below represents a light ray traveling from air to Lucite to medium Y and back into air.**- air, only
- Lucite, only
- medium Y, only
- air, Lucite, and medium Y