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3 years ago

I need help!!! I will give YOU brainliest if you answer something I like!\

Physics

1 answer:

Alexxx [7]3 years ago

3 0

Answer:

The law of conservation of energy says that the total energy of a closed system will remain constant (so its conserved over time). This law is also where you get energy can't be created or destroyed, only converted. One example is a bowling ball hitting pins. Since the bowling ball has kinetic energy (it's moving), hitting the pins will transfer the ball's energy over to the pins. This makes the bowling pins fall over.

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3 years ago

Please help do not guess

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3 years ago

An 8.0newton block is accelerating down a frictionless ramo inclined at 15 degrees to the horizontal. What is the magnitude of t

vichka [17]

Given that:

Force (F) = 8 N,

inclination of ramp (θ) =15°

determine magnitude of net force (Fnet) = ?

Fx =8 cosθ

= 8 × cos 15

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Fy = F sinθ

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Net force (Fnet) = sq.root [ (Fx)² + (Fy)²]

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3 0

4 years ago

an ice skater, standing at rest, uses her hands to push off against a wall. she exerts an average force on the wall of 120 N and

natulia [17]

Answer:

The skater's speed after she stops pushing on the wall is 1.745 m/s.

Explanation:

Given that,

The average force exerted on the wall by an ice skater, F = 120 N

Time, t = 0.8 seconds

Mass of the skater, m = 55 kg

It is mentioned that the initial sped of the skater is 0 as it was at rest. The change in momentum of skater is :

$\Delta p=m(v-u)\\\\\Delta p=mv$

The change in momentum is equal to the impulse delivered. So,

$J=\Delta p=F\times t\\\\mv=F\times t\\\\v=\dfrac{Ft}{m}\\\\v=\dfrac{120\times 0.8}{55}\\\\v=1.745\ m/s$

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3 years ago

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Andreas93 [3]

Answer:

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Explanation:

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