3 years ago

Can an object in motion ever change directions?

1 answer:

4 0

Answer:

Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity.

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The set of frequencies of the electromagnetic waves emitted by the atoms of an element is called

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Answer:

The set of frequencies of the electromagnetic Waves emitted by the atoms of an element is called emission spectrum.

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2 years ago

What is the magnitude of the force that lifts a 3-kilogram object straight upwards?

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Any force of 29.4 Newtons or greater can do it.

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3 years ago

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A car travels a distance of 400 m in 5 seconds. Calculate its average velocity.

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Answer:

80 m/s

Explanation:

x = 400 m

t = 5 s

x = vt,

400 = v(5),

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2 years ago

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Tenses of<br>write=<br>read=<br><br>

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present

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2 years ago

Katelyn (55 kg) is practicing a drop jump in the biomechanics lab. She steps off a plyometrics box, lands on the force plate, an

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Answer:

J = 357.5 kg*m/s

Explanation:

The impulse exerted on Katelyn when she was on the force plate, is equal to the change in her momentum, according to Newton's 2nd Law.
Assuming as the positive direction the upward direction (coincident with the positive y-axis) we can express the initial momentum as follows:

$p_{o} = m*v_{o} = 55 kg * (-3.0 m/s) (1)$

By the same token, the final momentum is as follows:

$p_{f} = m*v_{f} = 55 kg * (3.5 m/s) (2)$

As we have already said, the impulse J is just equal to the change in momentum, i.e., the difference between (2) and (1):

$J = p_{f} - p_{o} = m* (v_{f} -v_{o}) = 55 kg* (3.5m/s- (-3.0m/s)) = 357.5 kg*m/s (3)$

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2 years ago