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vivado [14]
4 years ago
14

When Jackson throws a tennis ball in a straight path, what two forces cause the ball to eventually stop moving?

Physics
2 answers:
Aleksandr-060686 [28]4 years ago
5 0

After Jackson lets go of the ball, there are two forces on it
that influence what it's going to do.  They are gravity and
air resistance.

Air resistance is just plain friction.  As long as the ball continues
to move through air, it loses kinetic energy to the air and gradually
slows down.

While the ball is in the air, there are no other forces on it that cause
it to stop moving. 

If you absolutely must have another one, it doesn't occur until the
ball hits the ground.  But that isn't even another force.  It's just more
friction, from scraping against concrete and grass.

Gravity pulls the ball down to the ground.  But gravity doesn't make
the ball stop moving.  In fact, gravity tries to make it move faster and
faster, and gravity would succeed if it weren't for all the friction that
the ball encounters.

Anon25 [30]4 years ago
3 0

Well, the force that originally caused it to start moving was inertia, but the  forces that cause it to stop are friction and gravity. Gravity pulls the object towards the center of the Earth, causing it to slow and eventually stop, and friction is the resistance between the ball and the ground (or whatever).

Hope this helps!

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Answer:

611.064 kJ

Explanation:

Given :

m = 200 mL = 200 g

Specific heat of ice = 2.06 J/g°C

Q = mcΔt

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Q1 = 200 * 2.06 * 22 = 9064 J

Q2 = Melt 0 °C solid ice into 0 °C liquid water:

Q2 = m · ΔHf ; ΔHf = heat of fusion of water = 334j/g

Q2 = 200 * 334 = 66800 J

Q3 : Heat to convert from 0°C to 100°C

Q3 = mcΔt ; c = 4.19 J/g°C ; Δt = (100 - 0) = 100

Q3 = 200 * 4.19 * 100 = 83800 J

Q4: heat required to boil water to steam

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Q4 = 200 * 2257 = 451400 J

Total Q = Q1 + Q2 + Q3 + Q4

Q = 9064 + 66800 + 83800 + 451400

Q = 611,064 Joules

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Answer:

d. Its magnitude and its direction both remained the same.

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Mathematically, momentum is given by the formula;

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The law of conservation of momentum states that the total linear momentum of any closed system would always remain constant with respect to time.

This ultimately implies that, the law of conservation of momentum states that if objects exert forces only on each other, their total momentum is conserved.

In this scenario, a rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. Thus, the statement which correctly describes the momentum of the rubber ball is that its magnitude and its direction both remained the same because its velocity didn't change while returning to the thrower.

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