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nordsb [41]
3 years ago
8

Some kids are playing dodgeball, in which they throw squishy balls at each other while trying to avoid being hit themselves. Ass

uming that the collisions between the balls are inelastic, which of the following statements is true if two balls collide with each other? A. Neither the kinetic energy nor the momentum of the system is conserved. B. The momentum of the system is conserved, while kinetic energy is not conserved. C. The kinetic energy of the system is conserved, while momentum is not conserved. D. Both the kinetic energy and the momentum of the system are conserved.
Physics
1 answer:
Gnoma [55]3 years ago
4 0
I believe it is A. Just don't hold me down on that. :D
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In a crash test, a 1000 kg automobile moving at 10 m/s crashes into a brick wall. How much energy goes into demolishing and warm
marishachu [46]

Answer:

Explanation:

Given

mass of automobile m=1000\ kg

velocity of automobile v=10\ m/s

If the automobile crashes into the brick wall then it's kinetic energy is converted into thermal and demolishing energy to wall.

Car completely stops as it crashes into the wall so Energy converted into demolition and thermal energy

E=\frac{1}{2}mv^2

E=\frac{1}{2}\times 1000\times (10)^2

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8 0
3 years ago
A cork shoots out of a champagne bottle at an angle of 40.0 above the horizontal. If the cork travels a horizontal distance of 1
ruslelena [56]

Answer:

The initial speed of the cork was 1.57 m/s.

Explanation:

Hi there!

The equation of the horizontal position of the cork in function of time is the following:

x = x0 + v0 · t · cos θ

Where:

x = horizontal position at time t.

x0 = initial horizontal position.

v0 = initial speed of the cork.

t = time.

θ = launching angle.

If we place the origin of the frame of reference at the launching point, then x0 = 0.

We know that at t = 1.25 s, x = 1.50 m. We also know the launching angle so we can solve the equation of horizontal position for the initial speed, v0:

x = v0 · t · cos θ

x / t · cos θ = v0

v0 = 1.50 m / (1.25 s · cos (40.0°)

v0 = 1.57 m/s

The initial speed of the cork was 1.57 m/s.

4 0
3 years ago
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Answer:

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The second one if it’s on edge
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