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3 years ago

What observations tell you that a car is accelerating

Physics

1 answer:

professor190 [17]3 years ago

8 0

When the car moves and makes a sound that is louder that when the car is just sitting there

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What is a quantum field?

liubo4ka [24]

It is the mathematical and conceptual framework for contemporary Elementary practical physicas. if that make sense to you.

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3 years ago

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Calculate the power of a train that uses 2MJ of chemical energy in 4<br> seconds.

nadya68 [22]

Answer:

500 kW

Explanation:

Given that,

Energy of the train, E = 2 MJ = 2×10⁶ J

Time, t = 4 seconds

We need to find the power of the train. We know that,

Power = energy/time

So,

$P=\dfrac{2\times 10^6}{4}\\\\P=500000\ W\\\\or\\\\P=500\ kW$

So, the power of the train is equal to 500 kW.

6 0

2 years ago

If you start rolling down this hill, your potential energy will be converted to kinetic energy. At the bottom of the hill ypu KE

Serjik [45]

Answer:

$v=\sqrt{(2x/m)}\ \ m/s$

Explanation:

Potential Energy= Kinetic Energy

Let $x$ be the value of Kinetic Energy.

We know that

$PE=KE=x\\x=\frac{1}{2}mv^2\\$

Make $v$ the subject of the formula to get speed at the bottom of the hill.

$v^2=2x/m\\v=\sqrt{2x/m}$

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3 years ago

How does the amount, or magnitude, of charge on an object affect its attraction or repulsion of another object?

melomori [17]

The stronger the magnitude the higher<span> the attraction and or repulsion </span><span />

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3 years ago

Clouds can weigh thousands of pounds due to their liquid water content. Often this content is measured in grams per cubic meter

-Dominant- [34]

Answer:

a) 0.2399 mi³

b) 440.8 × 10³ Pounds

Explanation:

Given:

Volume of cumulus cloud, V = 1 km³

Liquid water content = 0.2 g/m³

Now,

a) 1 km = $\frac{\textup{1 miles}}{\textup{1.6093}}$

thus,

1 km³ = $(\frac{\textup{1 miles}}{\textup{1.6093}})^3$

1 km³ = 0.2399 mi³

Hence, volume of cloud in cubic miles is 0.2399 mi³

Liquid water content = 0.2 g/m³

Now,

1 Km = 1000 m

thus,

1 km³ = 1000³ m³

Therefore,

Liquid water content in 1 Km³ of cloud = 0.2 g/m³ × 1000³ m³

= 200 × 10⁶ gram

= 200 × 10³ Kg

also,

1 kilogram = 2.204 pounds

Therefore,

200 × 10³ Kg = 200 × 10³ × 2.204 pounds = 440.8 × 10³ Pounds

8 0

3 years ago