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3 years ago

A human hair is approximately 57 um in di-

Physics

1 answer:

Pie3 years ago

8 0

Answer: The diameter of 57 um is equal to 5.7*10^-5 in meter.

Explanation: 1 micrometer is equal to 1*10^-6 meters.

We use this conversion to get the answer, we that 57 and we multiply it by 1*10^-6

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What is agrculture and it means

Zina [86]

<h2>Answer:</h2>

<u><em>Agriculture is the science, the practice of cultivating the soil, art, producing crops, raising livestock, and in varying degrees the preparation and marketing of the resulting products cleared the land to use for agriculture.</em></u>

<h2>Explanation: </h2>

<em>This is what I found during my research and I hope this helps. Correct me if I am incorrect! Have a good one. </em>

5 0

3 years ago

If velocity is positive, which woul

shusha [124]

Answer:

C. An inital volocity that is faster than the final volocity

Explanation:

5 0

3 years ago

In this problem, you will analyze a system composed of two blocks, 1 and 2, of respective masses m1 and m2. To simplify the anal

Dafna1 [17]

Answer:

a) p = m1 v1 + m2 v2 , b) dp / dt = m1 a1 + m2 a2 , c) It is equivalent to force

dp / dt = 0

Explanation:

In this problem we have two blocks and the system is formed by the two bodies.

Part A. Initially they ask us to find the moment of the whole system

p = m1 v1 + m2 v2

Part B.

Find the derivative

dp / dt = m1 dv1dt + m2 dv2 / dt

dp / dt = m1 a1 + m2 a2

Part C.

Let's analyze the dimensions

m a = [kg] [m / s2] = [N]

It is equivalent to force

Part d

Acceleration is due to a net force applied

Part e

The acceleration of block 1 is due to the force exerted by block 2 during the moment change

Part f

Force of block 1 on block 2

True f12 = m1a1 f21 = m2a2

Part g

By the law of action and reaction are equal magnitude F12 = f21

Part H

dp / dt = 0

Isolated system F12 = F21 and the masses are constant. The total moment is only redistributed

7 0

3 years ago

The temperature of a heat engine is 500 K. Some of the heat generated by the engine flows to the surroundings, which are

Naddik [55]

Answer:

The efficiency of the engine is 75% under given conditions.

<u>Explanation: </u>

<em>Efficiency is defined as the ratio of work done by the engine to the total heat supplied to a heat engine</em>. We know work done by the heat engine be difference between total heat supplied $\left(Q_{h}\right)$ by total heat utilized $\left(Q_{c}\right)$ . We can derive formula for efficiency by considering the above factors, $\text { efficiency }=\frac{\text { work done }}{\text { heat suplied }}=\frac{Q_{h}-Q_{c}}{Q_{h}}=1-\frac{Q_{c}}{Q_{h}}=1-\frac{T_{1}}{T_{2}} \therefore \text { efficiency }=1-\frac{T_{1}}{T_{2}}$

Now consider a heat engine is at a temperature of 500K and the heat produced by the engine released to the surroundings at a temperature of 125K. The efficiency is calculated by using the above formula, $\text { efficiency }=1-\frac{T_{1}}{T_{2}}=1-\frac{125}{500}=1-0.25=0.75$

∴ Efficiency of the engine is 75%

8 0

3 years ago

Convection occurs when thermal energy is transferred by the movement of

madam [21]

Answer:

Convection is the transfer of thermal energy from one place to another by the movement of gas or liquid particles. How does this happen? As a gas or liquid is heated, the substance expands. This is because the particles in liquids and gases gain kinetic energy when they are heated and start to move faster.

6 0

3 years ago