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Karolina [17]
3 years ago
11

Metals are usually more dense than wood. Pick the statement below which accurately compares metals to wood. Metals have less mas

s per unit volume than wood.
Metals have more mass per unit volume than wood.
Metal and wood have the same mass per unit volume.
Physics
1 answer:
laila [671]3 years ago
4 0

Answer:

Metals have more mass per unit of volume than wood.

Explanation:

Density is defined as the amount of matter contained in a unit of volume. A material that is denser than another will therefore have more mass per unit of volume.

The density of a body can affect buoyancy, bodies with low enough densities can float in fluids. For example wood can float in water while metals can't.

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If you placed a cylinder with a 0.25 m radius in the middle of a record player that spins at 4.7 rad/s, what is its angular mome
podryga [215]

Answer:

0.29 kg m² / s

Explanation:

Angular momentum is the product of moment of inertia and angular velocity.

L = I ω

For a solid cylinder, I = ½ m r².

L = ½ m r² ω

L = ½ (2.0 kg) (0.25 m)² (4.7 rad/s)

L = 0.29 kg m² / s

7 0
3 years ago
The power generated by the engine was just 2.984 KW. How long would this engine have to run to produce 3.60 × 104 J of work?
tangare [24]

Answer:

Time = 12.06 seconds

Explanation:

Given the following data;

Power = 2.984 KW = 2984 Watts

Workdone = 3.60 × 10^4 J = 36000 J

To find the time;

Power = workdone/time

Time = workdone/power

Time = 36000/2984

Time = 12.06 seconds

Therefore, the engine would have to run for 12.06 seconds.

8 0
3 years ago
Intense physical activity that requires little oxygen but uses short bursts of energy is called Anaerobic exercise? True or fals
Ghella [55]
I believe that is true. Anaerobic means without (much) Oxygen. This usually builds up lactic acid in muscles.
8 0
3 years ago
You are outdoors when you hear the constant chirp of a still cricket. You start walking toward the cricket and at some point you
givi [52]

Answer:

4) True, the distance was reduced by a de factor 2

Explanation:

To analyze the statements, let's first see how the sound is produced

The cricket makes the sound rubbed its legs, the energy needed to produce it is constant, after the sound is produced it expands in all directions and this wave is subject to the law of energy conservation.

By expanding in all directions we can assume that the energy for the time that is the power of the sound is distributed over a sphere with different radii each time. The perceived intensity is defined as the power per unit area

       I = P / A

Where P is the power, A are the areas and I are the intensities heard by the person

Let's clear the power and match, for two different radii (distances)    

      P = I₁ A₁ = I₂ A₂

The area of ​​a sphere is

     A = 4π R₂

     I₂ = I₁ A₁ / A₂

     I₂ = I₁ 4π R₁² / 4π R₂²

     I₂ = I₁ R₁² / R₂²

Let's analyze this last equation for the situation presented if the intensity increases 4 times, substitute

    I₂ = 4 I₁

    4 I₁ = I₁ R₁² / R₂²

   R₂ = R₁ / 2

We see that to increase the intensity 4 times the distance was reduced twice

Now we can analyze the expressions given

2) False, the power is constant, the cricket always does the same job

3) False, the speed of the wave is constant in the air

4) True, the distance was reduced by a de factor 2

3 0
3 years ago
What is a solution a special type of mixture
NeTakaya

Answer:

In chemistry, a solution is a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.

Explanation:

Sorry if it's wrong!!!!!!

3 0
3 years ago
Read 2 more answers
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