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3 years ago

What are the eight states of matter?

2 answers:

7 0

The eight states of matter are

Solid.
Liquid.
Gas.
Plasma.
Bose-Einstein Condensate.
Excitonium.
Degenerate Matter.
Photonic Matter.

Nitella [24]3 years ago

6 0

I agree with the person above

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Tina served the ball directly to Brian with a high amount of force. Since the ball is moving so quickly, Brian does not have muc

snow_tiger [21]

The answer is Reaction time

4 0

3 years ago

Read 2 more answers

How fast must a 0.142-kg baseball move in order to have the same momentum as the bus?

Otrada [13]

Momentum is the product of mass and velocity of a body. In this case, the bus has a mass of 18200 kg and moving with a velocity of 10 m/s.
Therefore, the momentum of the bus will be, 18200×10 = 182,000 kgm/s.
Thus a ball of mass 0.142 kg will require to travel with a speed of;
= 182000/0.142
= 1.282 ×10∧6 m/s to have the same momentum with the bus.

6 0

4 years ago

A car covers 72 kilometers in the first hour of its journey. In the next hour, it covers 90 kilometers. What is the amount of wo

Nina [5.8K]

The work done is $2.8125 \times 10^{5} \mathrm{J}$

Work Done = Change in Kinetic Energy (ΔKE)

<u>Explanation</u>

In first 1 hour it travels 72 km

So, Velocity = $\frac{\text { distance }}{\text { time }}=\frac{72}{1} k m / h=72 \mathrm{km} / \mathrm{h}=\frac{72000}{3600} \mathrm{m} / \mathrm{s}=20 \mathrm{m} / \mathrm{s}$

or, Initial Velocity (u) = 20 m/s

Similarly for the next hour it covers 90 km

So, Velocity = $\frac{\text { distance }}{\text { time }}=\frac{90}{1} k m / h=90 \mathrm{km} / \mathrm{h}=\frac{90000}{3600} \mathrm{m} / \mathrm{s}=25 \mathrm{m} / \mathrm{s}$

or, Final Velocity (v) = 20 m/s

Work done = Change in Kinetic Energy (ΔKE)

Work done = ΔKE = $\frac{1}{2} m v^{2}-\frac{1}{2} m u^{2}$

ΔKE = $\frac{1}{2} m\left(v^{2}-u^{2}\right)=\frac{1}{2} \times\left(2.5 \times 10^{3}\right) \times\left(25^{2}-20^{2}\right)$

= $\frac{2500 \times(625-400)}{2}=\frac{2500 \times 225}{2}=\frac{562500}{2}$ = 281250 joule

= $2.8125 \times 10^{5} \mathrm{J}$

4 0

3 years ago

Legend has it that, many centuries ago,Archimedes jumped out of his bathtub and ran across town nakedscreaming "Eureka!" after h

docker41 [41]

Answer: 8652.36857143 x $10^{4}$ molecules

Explanation:

We need a lot of assumptions in this case.

1. We don't know the mass of water that was present in Archimedes' bath tub that day.

2. Since it recycles, we don't know the total mass of water present on earth.

Assuming the total mass of water on earth is 1.4 × $10^{18}$ tonnes;

converting tonnes to kgs -->> 1.4 × $10^{21}$ kg

Since only 2.5% of this is fresh, (the rest is saline and ocean-based)

-->> 2.5% of 1.4 × $10^{21}$ kg = 0.035 × $10^{21}$ kg

An average bath tub holds about 80 gallons of water.

80 gallons to kgs = 302.8329 kg

Using Avogadro's number,

we have about 6 × $10^{23}$ molecules in 18g of water;

1kg of water would contain about 3.3 × $10^{25}$ molecules.

An average water can holds about 355mL of fluid.

Therefore the number of molecules in the can is $10^{25}$ .

The number of bathtub molecules present in the can is;

302.8329 x $10^{25}$ / 0.035 x $10^{21}$

= 8652.36857143 x $10^{4}$ molecules

3 0

3 years ago

What happens when a ray of light hits a mirror? Detailed answer please :)

Morgarella [4.7K]

When light called the incident ray hits a mirror at any angle, it reaches 0˚ called the Normal line. The light bounces back at the same angle it entered but on the opposite side of the Normal.
<span>The light rays hitting concave mirror reflects back and converge at a point in front of it called the Focal Point. And beyond that point when the when rays comes to our eyes than due to convergence the objects looks bigger in size than its actual size. Due to this concave mirrors are used in back-view mirror in vehicles.</span>

5 0

4 years ago