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3 years ago

We see the Sun before it comes above the horizon. Explain.

Physics

1 answer:

siniylev [52]3 years ago

3 0

Answer:

Atmospheric refraction causes the Sun to be seen while it is still below the horizon. Light from the lower edge of the Sun's disk is refracted more than light from the upper edge. This reduces the apparent height of the Sun when it appears just above the horizon.

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3. If you roll a ball up a hill, it undergoes positive acceleration. True or false

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What is true about the force between charges?

shusha [124]

Answer:

The statements A and D are true

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Explanation:

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3 years ago

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Which type of motor is shown below?

Viefleur [7K]

Answer:

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3 years ago

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A 1500 kg car is moving on a flat, horizontal flat road. If the radius of the curve is 35 m and

Troyanec [42]

The net force on the car is the friction that keeps it on the road, which points toward the center of the circle of the curve. Then by Newton's second law, we have

• net vertical force:

∑ F = N - W = 0

• net horizontal force:

∑ F = Fs = m a

where

N = magnitude of normal force

W = car's weight

Fs = mag. of static friction

m = car's mass

a = v ²/R = mag. of the centripetal acceleration

v = car's speed

R = radius of curve

Now,

• compute the car's weight:

W = m g = (1500 kg) (9.8 m/s²) = 14,700 N

• solve for the mag. of the normal force:

N = 14,700 N

• solve for the mag. of the friction force, using the given friction coefficient:

Fs = 0.5 N = 7350 N

• solve for the (maximum) acceleration:

7350 N = (1500 kg) a → a = 4.9 m/s²

• solve for the (maximum) speed:

4.9 m/s² = v ²/ (35 m) → v ≈ 13 m/s

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3 years ago

We see the Sun before it comes above the horizon. Explain.​

We see the Sun before it comes above the horizon. Explain.