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3 years ago

The equation for density is mass divivded by volume.an increase in denstiy can result from all of following expect??

Physics

1 answer:

sineoko [7]3 years ago

4 0

It would be option A (a decrease in mass with an increase in volume)

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Three kids are riding on a snow sled traveling horizontally without friction at 19.8 m/s. The masses of Kid A, B, and C are 42.8

Kamila [148]

Answer:

34.6 m/s

Explanation:

From conservation of momentum, the sum of initial and final momentum are equal. Momentum is a product of mass and velocity. Initial mass will be 42.8+31.5+25.9=100.2 kg

Final mass will be 31.5+25.9=57.4 kg

From formula of momentum

M1v1=m2v2

Making v2 the subject of the formula then

$V2=\frac {M1v1}{m2}$

Substitute 100.2 kg for M1, 19.8 m/s fkr v1 and 57.4 kg for m2 then

$V2=\frac {100.2 kg\times 19.8 m/s}{57.4 kg}=34.56376 m/s\approx 34.6 m/s$

4 0

4 years ago

What are the damages or effects of sewage dumps into natural water sources???

masha68 [24]

Answer:

Sewage dumps pollute our waterways causing death of marine life, water pollution, and disease.

Explanation:

Sewage dumps. bring disease or death to our ecosystems

5 0

3 years ago

Read 2 more answers

3. A 20 kg lawnmower is pushed by its handle, which makes a 40 degree angle with the horizontal. What

Mkey [24]

<u>13788 J is required to finish the work.</u>

Explanation:

Given that,

Mass of lawnmower is 20 kg

Force = 30 N

$\text { Angle }(\theta)=40^{\circ}$

Displacement ( distance moved )= 20m

The force of 30N is applied along the direction of motion and was applied for the whole 20 m.

The formula of work done for one pass is

$\text { Work done }=\text { force } \times \text { displacement } \times \cos \theta$

Substituting the given data into the formula,

$W=30 \times 20 \times \cos 40^{\circ}$

$\mathrm{W}=600 \times \cos 40^{\circ}$

$\mathrm{W}=600 \times 0.766$

W = 459.6 J

Work done for one pass = 459.6J

Now, work done for 30 passes is calculated by multiplying the work done for one pass into 30.

$\text { Then the work done for } 30 \text { passes is } 459.61 \times 30=13788 \mathrm{J}$

Work is done by the person pushing the mower to finish the work is <u>13788 J</u>.

5 0

3 years ago

A wave which needs a medium (solid, liquid, gas) in order to propagate itself.

Vadim26 [7]

The correct answer to the question is: Sound wave.

EXPLANATION:

Before going to answer this question, first we have to understand longitudinal wave.

A longitudinal wave is a mechanical wave in which the direction of propagation of wave is parallel to the direction of particle vibration.

This wave propagates through a medium in the form of compression and rarefaction.

Compression are the regions of high pressure zones where the particles of the medium are closely aggregated to each other.

Rarefaction is the region of low pressure where particles of the medium are not so close to each other as compared to compression.

The longitudinal wave can not propagate in space. It always needs a medium for it's propagation. The medium may be solid, liquid or gas .

For instance, sound wave is a longitudinal wave.

Hence, the correct answer of this question is sound wave which needs a medium for it's propagation.

5 0

3 years ago

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How does a balanced Chemical Equation Satisfy the Law of Conservation of Mass?

andriy [413]

<h3>During a chemical reaction,one ore more new substances forwed</h3>

8 0

3 years ago