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igomit [66]
3 years ago
12

Please help!!

Physics
1 answer:
Elina [12.6K]3 years ago
8 0

Answer:

C. 4.0 J

Explanation:

Work is equal to the change in kinetic energy or kinetic energy final - kinetic energy initial. 1/2 mv^2 is the equation for kinetic energy. SInce the mass is the same, you don't have to include it when solving. 1/2 times 1^2 = 1/2. 1/2 times 3^2 = 4.5. 4.5 - 0.5 = 4 J

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On a smooth horizontal floor, an object slides into a spring which is attached to another mass that is initially stationary. Whe
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Answer:

E) momentum and mechanical energy

Explanation:

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The kinetic energy and momentum of the system after collision and the kinetic energy and momentum of the two masses before collision will be constant.

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3 years ago
Which of the following is NOT a property of long-period comets that suggests that they originate from the Oort cloud?
Lesechka [4]

Answer:

b. They orbit around the Sun in a counterclockwise direction, when viewed from above the ecliptic plane.

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7 0
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A 5.00 kg crate is on a 21.0 degree hill. Using X-Y axes tilted down the plane, what is the y-component of the normal force?
Rama09 [41]

Answer:

The y-component of the normal force is 45.74 N.

Explanation:

Given that,

Mass of the crate, m = 5 kg

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We need to find the y component of the normal force. We know that the y component of the normal force is given by :

F_y=F\ \cos\theta\\\\F_y=mg\ \cos\theta\\\\F_y=5\times 9.8\ \cos(21)\\\\F_y=45.74\ N

So, the y-component of the normal force is 45.74 N. Hence, this is the required solution.

7 0
3 years ago
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