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practice final Flashcards

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1
Q
  1. An object moves at a constant speed of 6 m/s. This means that the object:
A

Moves 6 meters every second

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2
Q
  1. The graph (v vs. t straight line on 4m/s) represents the relationship between velocity and time for an object moving in a straight line. What is the traveled distance of the object at 9 s?
A

36 m

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3
Q
  1. A motorbike travels east and begins to slow down before a traffic light. Which of the following is the correct direction of the motorbike’s acceleration?
A

straight left

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4
Q
  1. A car and a delivery truck both start from rest and accelerate at the same rate. However, the car accelerates for twice the amount of time as the truck. What is the traveled distance of the car compared to the truck?
A

four times as much

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5
Q
  1. The position and the elapsed time of a motorbike are presented by the diagram. The motorbike starts from rest and accelerates at a constant rate. What is the acceleration of the motorbike?
A

4 m/s^2

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6
Q

when a cat sleeps on a table, the net force on it is

A

zero

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7
Q

the acceleration of an object is inversely proportional to

A

its mass

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8
Q

the earth pulls down on a railroad wagon with a force of 200 kN. which of the following is the “reaction force”?

A

. The wagon pulls up the Earth with 200 kN

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9
Q
  1. An elevator of mass M is pulled upwards by a cable; the elevator has a positive, but decreasing, velocity. What is the tension in the cable (neglecting the mass of the cable)?
A

between zero and Mg

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10
Q
  1. In the figure to the right, two boxes of masses m and 4m are in contact with each other on a frictionless surface. What is the acceleration of the more massive box?
A

F/(5m)

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11
Q

In the figure to the right, two boxes of masses m and 4m are in contact with each other on a frictionless surface. What is the force causing the acceleration of the more massive box?

A

4F/5

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12
Q

a small sphere is swung in a vertical circle. which of the following combinations represents the direction of the velocity and acceleration at the point where the sphere is located?

A

velocity straight up, acceleration straight left (inward to the center of the circle, tension)

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13
Q
  1. A boy stands at the edge of a rotating table. Which of the following forces prevents him from sliding of the table?
A

the static friction

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14
Q
  1. An object rotates with a period of 10 s. How many revolutions will it make in 25 s?
A

2.5

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15
Q

An object rotates with a frequency of 300Hz. How many revolutions will it make in 15s?

A

4500

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16
Q

A pilot performs a vertical maneuver around a circle with a radius R. When the airplane is at the lowest point of the circle, the pilot’s weight is 4mg. What is the velocity at the lowest point?

A

square root of 3𝑅𝑔

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17
Q
  1. Two objects with equal masses of 1 kg each are separated by a distance of 1 m. The gravitational force between the objects is:
A

Equal to G

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18
Q
  1. Two objects are attracted to each other by a gravitational force F. If each mass is tripled and the distance between the objects is cut in half, what is the new gravitational force between the objects in terms of F?
A

36 F

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19
Q
  1. A spacecraft starts on Earth is moving to Mars. Which of the following is correct about the gravitational force on the spacecraft due to Earth’ attraction?
A

The spacecraft is never beyond the Earth’s gravitational attraction

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20
Q

A block of mass m is moved over a distance d. An applied force F is directed perpendicularly to the block’s displacement. How much work is done on the block by the force F?

A

zero

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21
Q
  1. A block of mass m is moved over a distance d. An applied force F is opposite to the block’s displacement. How much work is done on the block by the force F?
A

-Fd

22
Q

The force as a function of displacement of a moving object is presented by the graph (constant force at 5). How much work is done when the object moves from 0 m to 8 m?

A

40 J

23
Q

An applied force F accelerates an object from rest to a velocity v. How much work is done by the applied force F?

A

1/2 mv^2

24
Q
  1. A heavy block is suspended from a vertical spring. The elastic potential energy is stored in the spring is 0.8 J. What is the elongation of the spring if the spring constant is 100 N/m?
A

13 cm

25
Q
  1. A truck drives slams on the brakes of a moving truck with a constant velocity v, as a result of his action the truck stops after traveling a distance d. If the driver had been traveling with twice the velocity, what would be the stopping distance compared to the distance in the first trial?
A

. Four times greater

26
Q
  1. A 500 kg sailboat moves with a momentum of 150,000 kg·m/s? What is the velocity of the boat?
A

300 m/s

27
Q

A cannon fires a cannonball and recoils backward. Which of the following statements is true about the cannon recoil?

A

It happens because the momentum of the system is conserved

28
Q

An 80 kg diver jumps off a moving boat. The boat has a mass of 400 kg and moves at a constant velocity of 2 m/s. What is the velocity of the boat after the jump if the diver jumps with a velocity of 3 m/s in opposite direction to the initial velocity of the boat?

A

3 m/s

29
Q

A piece of clay moving with an initial momentum Pi collides with a vertical wall and sticks to it. Which of the following is correct about the vector of impulse that the clay experiences during the collision?

A

straight right

30
Q
  1. There are two round tables in the physics classroom: one with the radius of 50 cm the other with a radius of 150 cm. What is the relationship between the two forces applied on the tabletops by the atmospheric pressure?
A

F1/F2 = 1/9

31
Q

What is the difference between the pressure on the bottom of a pool and the pressure on the water surface?

A

ρgh

32
Q
  1. Physics students use a spring scale to measure the weight of a piece of lead. The experiment was performed two times one in air the other in water. If the volume of lead is 50 cm3, what is the difference between two readings on the scale? (Density of lead: 11.3 g/cm3, density of water: 1 g/cm3)
A

0.5 N

33
Q
  1. Three blocks of equal volume are completely submerged into water. The blocks made of different materials: aluminum, iron and lead. Which of the following is the correct statement about the buoyant force on each block? (Ρaluminum = 2700 kg/m3, ρiron = 7800 kg/m3, ρlead = 11300 kg/m3)
A

Faluminum = Firon = Flead

34
Q
  1. A wire of length L and cross-sectional area A has a resistivity ρ. Which of the following formulas can be used to calculate the resistance of the wire?
A

R = ρL/A

35
Q

The electric current as a function of voltage of a wire is presented by the graph to the right. What is the resistance of the wire? V=IR. given V is 5 and I is 3.

A

1.6 ohms

36
Q
  1. The electric current as a function of voltage of a wire is presented by the graph. What is the power dissipated in the resistor when the applied voltage is 5 V? P=IV where V is 5 and I is 3.
A

15 W

37
Q

A magnet bar is divided in two pieces. Which of the following statements is true?

A

The two magnets are created

38
Q
  1. A mass M suspended from a string L undergoes SHM (simple harmonic motion). Which of the following is true about the period of oscillations?
A

The period increases with increasing length

39
Q
  1. The length of a simple pendulum oscillating with a period T is quadrupled, what is the new period of oscillations in terms of T?
A

2 T

40
Q

(diagram of mass undergoing simple harmonic motion from -A to +A) 65. When the mass reaches point x = +A its instantaneous velocity is?

A

Zero

41
Q

(diagram of mass undergoing simple harmonic motion from -A to +A) 66. When the mass reaches point x = 0 its instantaneous velocity is?

A

Maximum and can be positive or negative

42
Q

(diagram of mass undergoing simple harmonic motion from -A to +A) 67. When the mass reaches point x = +A its instantaneous acceleration is?

A

Maximum and negative

43
Q

(diagram of mass undergoing simple harmonic motion from -A to +A) 68. When the mass reaches point x = 0 its instantaneous acceleration is?

A

Zero

44
Q

The frequency of a wave is doubled when the wavelength remains the same. What happens to the speed of the wave?

A

it doubles

45
Q
  1. Two sound sources S1 and S2 produce waves with frequencies 1000 Hz and 500 Hz. When we compare the speed of wave 1 to the speed of wave 2 the result is:
A

the same

46
Q
  1. A sound wave resonates in a tube with two open ends. What are the wavelengths of the three lowest resonating frequencies generated in the tube?
A

2L, L, 2L/3

47
Q
  1. The lowest frequency in an open tube is 250 Hz. What are the three following frequencies will resonate in the tube?
A

500Hz, 750Hz, 1000Hz

48
Q
  1. A sound wave resonates in a tube with one open end. What are the wavelengths of the three lowest resonating frequencies generated in the tube?
A

4L, 4L/3, 4L/5

49
Q

The lowest frequency in a closed tube is 200 Hz. What are the three following frequencies will resonate in the tube?

A

600Hz, 1000Hz, 1400Hz

50
Q

(target diagram with each level labeled A,B,C,and D) 79. A sound source S radiates a sound wave in all directions. The relationship between the distances is SA = AB = BC = CD. Which of the following points oscillates at the highest frequency?

A

all points have the same frequency

51
Q
  1. An object is placed in front of a converging lens at a distance between F and 2F. The image produced by the lens is:
A

Real, inverted and magnified

physics 110 (2 decks)

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