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Cumulative Exam — Cumulative exam Answers

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Which fields would most likely make use of spectroscopy techniques? Select 4 options. food productionmedical researchscientific researchspace researchweather forecasting

A
food production
B
medical research
C
scientific research
D
space research
E
weather forecasting
3
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A student wants to determine the impulse delivered to the lab cart when it runs into the wall. The student measures the mass of the cart and the velocity of the cart before it hits the wall.

A
the velocity of the cart after it hits the wall
B
the force exerted on the cart by the wall
C
the time the cart is in contact with the wall
D
the acceleration of the cart before it hits the wall
4

The power rating of a clock is 10 W, and the cost of electrical energy is $0.15 per kilowatt-hour.

A
$0.04
B
$0.25
C
$1.68
D
$11.20
5

A positive rod is touched to a neutral sphere.

Question illustration
A
It is showing the direction that protons move in, making the sphere negative.
B
It is showing the direction that protons move in, making the sphere positive.
C
It is showing the direction that electrons move in, making the sphere positive.
D
It is showing the direction that electrons move in, making the sphere negative.
6

Which statement is part of Dalton's atomic theory?

A
Matter is composed of small particles called atoms.
B
Atoms can be divided into their subatomic particles.
C
Atoms are able to be seen with proper spectroscopy equipment.
D
Chemical reactions can change atoms from one type to another.
7

Which changes in an electric motor will make the motor stronger? Select 3 options.using a stronger permanent magnetusing a weaker permanent magnetincreasing current in the electromagnetdecreasing current in the electromagnetincreasing the distance between the magnetsdecreasing the distance between the magnets

A
using a stronger permanent magnet
B
using a weaker permanent magnet
C
increasing current in the electromagnet
D
decreasing current in the electromagnet
E
increasing the distance between the magnets
F
decreasing the distance between the magnets
8

Force F acts between two charges, q1 and q2, separated by a distance d.

A
F
Option A
B
F
Option B
C
F
D
2F
9

A spring has a spring constant of 48 N/m. The end of the spring hangs 8 m above the ground.

A
96 N
B
288 N
C
384 N
D
480 N
10

Which factors affect the strength of a magnetic field around a current-carrying wire? Check all that apply.the type of metal of the wirethe amount of the currentthe direction of the currentthe temperature of the wirethe distance from the wire

A
the type of metal of the wire
B
the amount of the current
C
the direction of the current
D
the temperature of the wire
E
the distance from the wire
11

What are the conditions needed for an ideal pendulum? Check all that apply.

A
Gravitational force acts to pull the pendulum’s mass down.
B
The mass of the rod of the pendulum is evenly distributed along the rod.
C
The pivot on which the pendulum swings is frictionless.
D
The pendulum swings through its equilibrium position as a result of inertia.
E
Tension acts downward on the pendulum’s mass.
12

Two identical waves are traveling toward each other in the same medium. One has a positive amplitude, meaning that its peaks only go upward, and the other wave has a negative amplitude, with peaks going downward.

A
constructive interference
B
destructive interference
C
a reflecting wave
D
wave refraction
13

Which diagram best illustrates the magnetic field of a bar magnet?

A
A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
Option A
B
A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
Option B
C
A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
Option C
D
A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
Option D
14

When a baseball player catches a baseball, the glove "gives" or moves backward. How does this movement affect the change in momentum of the baseball?

A
The change in momentum increases because the impact time increases.
B
The change in momentum decreases because the force decreases.
C
The change in momentum stays the same because the ball still comes to a stop.
D
The change in momentum depends on the initial speed of the ball and the time to stop.
15

A current of 1.8 A delivers 2.5 C of charge.How much time was required?

A
0.70 s
B
0.72 s
C
1.4 s
D
4.5 s
16

What is the best description of a wave?

A
a pulse that carries energy
B
a disturbance that moves matter
C
a medium disturbed by a vibration
D
matter that is moved from one place to another
17

In a lab experiment, a student is trying to apply the conservation of momentum. Two identical balls, each with a mass of 1.0 kg, roll toward each other and collide. The velocity is measured before and after each collision. The collected data is shown below.Which trial shows the conservation of momentum in a closed system?

Question illustration
A
Trial 1
B
Trial 2
C
Trial 3
D
Trial 4
18

A wire is joined to points X and Y in the circuit diagram shown.How does the circuit change when the wire is added?

Question illustration
A
A closed circuit occurs and makes all bulbs turn off.
B
An open circuit occurs and makes all bulbs turn off.
C
A short circuit occurs and makes bulbs 3 and 4 turn off but keeps bulbs 1 and 2 lit.
D
A short circuit occurs and makes bulbs 1 and 2 turn off but keeps bulbs 3 and 4 lit.
19

The diagram shows the electric field lines around two charges.

Question illustration
A
They are negative, and they repel.
B
The left is negative and the right is positive, so they attract.
C
The left is positive and the right is negative, so they attract.
D
They are positive, and they repel.
20

What is the main difference between a permanent magnet and a temporary magnet?

A
A permanent magnet is made of a ferromagnetic material, while a temporary magnet is not.
B
A temporary magnet attracts only metal objects, while permanent magnets attract both metal objects and other magnets.
C
The domains in a temporary magnet easily lose alignment, but the domains in a permanent magnet keep their alignment.
D
There are domains in a permanent magnet, but not in a temporary magnet.
21

The diagram shows the electric field around two charged objects.

Question illustration
A
Y is negative, and Z is positive.
B
Y is negative, and Z is negative.
C
Y and Z are like charges, but their identities cannot be determined.
D
Y and Z are opposite charges, but their identities cannot be determined.

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