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ser-zykov [4K]
4 years ago
15

Suppose you observe that at night, the air just above the ground feels cooler than the air above it. then in the middle of a sun

ny day, you notice that the air close to the ground feels warmer. which process explains this?
Physics
1 answer:
yanalaym [24]4 years ago
6 0
The answer is convection
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As shown in the picture above, a sled of mass 67 kilograms is pulled
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Explanation:

F net of sled = Tension force by rope - Kinetic friction between ground.

F normal of sled = mg = (67kg)(9.81kg/m^2) = 657.27N.

Kinetic friction = 0.18 (I cannot see the value) * Normal force of sled = 0.18 * 657.27N = 118.31N

So F net of sled = 800N - 118.31N = 681.69N.

(I cannot see what the question is asking for, please check on your own!)

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3 years ago
Assume you are in the car and the car is moving at a certain speed to
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You are at rest with respect to the car.
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3 years ago
oscillating spring mass systems can be used to experimentally determine an unknown mass without using a mass balance. a student
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Answer:

Mass, m = 6.18 kg

Explanation:

Given the following data;

Frequency, F = 10 Hz

Spring constant, k = 250 N/m

We know that pie, π = 22/7

To find the mass, we would use the following formula;

F = 1/2π√(k/m)

Where;

F is the frequency of oscillation.

k is the spring constant.

m is the mass of the spring.

Substituting into the formula, we have;

10 = 1/2 * 22/7 * √250/m

10 = 22/14 * √250/m

Cross-multiplying, we have;

140 = 22 * √250/m

Dividing both sides by 22, we have;

140/22 = √250/m

6.36 = √250/m

Taking the square of both sides, we have;

6.36² = (√250/m)²

40.45 = 250/m

Cross-multiplying, we have;

40.45m = 250

Mass, m = 250/40.45

Mass, m = 6.18 kg

3 0
3 years ago
Compare and contrast microscopic and macroscopic energy transfer Give least three comparisons for each
Eduardwww [97]

Answer:

Differences

microscopic refers to substances visible to the naked eye

macroscopic are substances invisible to naked eye

Similarities

both refer to different scales that are useful to determining the size to different compounds.

Explanation:

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3 years ago
Two pans of water are on different burners of a stove. One pan of water is boiling vigorously, while the other is boiling gently
vichka [17]

Answer:

The correct answer is C.

Explanation:

3 0
3 years ago
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