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Emissions from alpha decay require the least amount of shielding. Which best describes why the emissions from alpha decay are so easily blocked compared to the emissions of other types of radioactive decay?

A
Alpha decay releases particles that have less mass and charge than the particles released during gamma decay.
B
Alpha decay releases visible light, which has less energy than the light released during gamma decay.
C
Alpha decay releases particles that have less mass and charge than the particles released during beta decay.
D
Alpha decay releases particles that have more mass and charge than the particles released during beta decay.
42
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A car moving south speeds up from 10 meters per second to 40 meters per second in 15 seconds. What is the car’s acceleration?

A
2 the fraction with numerator m and denominator s squared
B
15 the fraction with numerator m and denominator s squared
C
30 the fraction with numerator m and denominator s squared
D
50 the fraction with numerator m and denominator s squared
43

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. What other measurement is necessary to calculate the impulse delivered to the lab cart?

A
the force exerted on the cart by the wall
B
the time the cart is in contact with the wall
C
the acceleration of the cart before it hits the wall
D
the velocity of the cart after it hits the wall
44

Which graph shows the relationship between temperature, X, and kinetic energy, Y?

A
Image with description A graph with the x axis labeled X and the y axis labeled Y. There is a diagonal line from the origin.
B
Image with description An illustration of a triangle with the base labeled X with the height labeled Y.
C
Image with description A graph with the x axis labeled X and the y axis labeled Y. There is a vertical line.
D
Image with description A graph with the x axis labeled X and the y axis labeled Y. There is a horizontal line.
45

Which is the best example of kinetic energy?

A
Image with description A picture of a field of flowers in the sunlight.
B
Image with description A picture of a dog running.
C
Image with description A picture of an owl sitting on a branch.
D
Image with description A picture of some rocks sitting on grass.
46

The gravitational force between two objects is 1600 N. What will be the gravitational force between the objects if the distance between them doubles?

A
400 N
B
3200 N
C
6400 N
D
800 N
47

Once started, why can nuclear fission continue to occur on its own?

A
A neutron begins the reaction, and more neutrons are formed in it.
B
The neutron formed by the reaction can cause more nuclei to combine.
C
The thermal energy released can cause the products to join.
D
The thermal energy released can cause the products to split.
48

What is the horizontal acceleration of a ball that is launched horizontally with a velocity of 5 point 6 m/s ?

A
0 m/s squared
B
negative 9 point 8 m/s squared
C
9 point 8 m/s squared
D
5 point 6 m/s squared
49

On an ice skating rink, a girl of mass 50 kilograms stands stationary, face to face with a boy of mass 80 kilograms The children push off of one another, and the boy moves away with a velocity of 3 meters meters per second What is the final velocity of the girl?

A
4.8 meters meters per second
B
1.9 meters meters per second
C
4.8 meters meters per second
D
1.9 meters meters per second
50

Which diagram represents the forces acting on the block?

A
Image with description A free body diagram with three forces: a force vector north labeled F Subscript N Baseline, a force vector southeast labeled F Subscript f Baseline, and a force vector south labeled F Subscript g Baseline, which is equal in magnitude but opposite in direction the north vector.
B
Image with description A free body diagram with three forces: a force vector northeast labeled F Subscript N Baseline, a force vector southeast labeled F Subscript f Baseline, and a force vector southwest labeled F Subscript g Baseline that is equal in magnitude but opposite in direction to the vector pointing northeast.
C
Image with description A free body diagram with three forces: a force vector northeast labeled F Subscript N Baseline, a force vector northwest labeled F Subscript f Baseline, and a force vector south labeled F Subscript g Baseline.
D
Image with description A free body diagram with three forces: a force vector northeast labeled F Subscript N Baseline, a force vector southeast labeled F Subscript f Baseline, and a force vector south labeled F Subscript g Baseline.

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