PHYSICS HIGH SCHOOL

The freezing point of water is the same as its a. melting point. b. boiling point. c. sublimation point. d. evaporation point.

Answers

Answer 1

Answer:

Answer: melting point.

Explanation:

Freezing point is the temperature at which liquid phase changes to solid phase. Freezing point of water is $0^0C$ .

$H_2O(l)\rightarrow H_2O(s)$

Melting point is the temperature at which solid phase changes to liquid phase. Melting point of water is $0^0C$ .

$H_2O(s)\rightarrow H_2O(l)$

Melting and freezing are reversible processes which takes place at $0^0C$ for water.

Boiling point is the temperature at which vapor pressure of the liquid becomes equal to atmospheric pressure.

Sublimation point is the temperature at which gaseous phase changes to solid phase.

Thus the freezing point of water is the same as its melting point.

Answer 2

Answer:

The freezing point of water is the same as its melting point. (option a)

The freezing point of a substance refers to the temperature at which it changes from a liquid state to a solid state. In the case of water, this is when it turns from liquid water into ice. It's crucial to note that the freezing point of a substance is the same as its melting point, which is the temperature at which the solid changes back into a liquid. So, the answer is option a. The freezing point of water is the same as its melting point.

Hence the correct option is (a).

To know more about freezing point here

brainly.com/question/31357864

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How much kinetic energy does a 7.2-kg dog need to make a vertical jump of 1.2 m? the acceleration due to gravity is 9.8m / s^2

Answers

$E_k=mgh\n\nm=7.2\ kg\n\ng=9.8\ m/s^2\n\nh=1.2\ m\n\nE_k=7.2\cdot9.8\cdot1.2=84.672\ \left[(kgm^2)/(s^2)\right]=84.672\ [J]$

Assuming that no energy is wasted,
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1.2*7.2*9.8=
84.672
(The answer might be wrong I did it in my head)

An 89 kg person climbs up a uniform 13 kg ladder. The ladder is 5.9 m long; its lower end rests on a rough horizontal floor (static friction coefficient 0.26) while its upper end rests against a frictionless vertical wall. The angle between the ladder and the horizontal is 52◦. Let d denote the climbing person's distance from the bottom of the ladder (see the above diagram). When the person climbs too far (d > dmax), the ladder slips and falls down (kaboom!). Calculate the maximal distance dmax the person will reach before the ladder slips. The acceleration of gravity is 9.8 m/s2.

Answers

Answer:

The maximum distance the person will reach before he slip is 1.82m.

Not even close to the middle of the ladder.

Explanation:

Check attachment for solution

I dont get why its c i dont under the graph for the vertical component in option c

Answers

The vertical component grows at an increasing rate because
gravity is ACCELERATING the object vertically. So its speed
keeps growing. Speed is the slope of the displacement graph.

A steel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. What is the force of gravity acting on the block (the weight) in water?

Answers

$d=(m)/(V)\n \n 0.08 = (m)/(7,840)\rightarrow m=0.08 * 7,840=627.2 \ kg$

$\vec{F_g}=m.\vec{g}=627.2 *9.8=6,146.56 \ N$

Density = 7840 kg per m³
Volume = 0.08 m³
Mass = 0.08 of 7840 kg = 627.2 kg

Now I'm going to give you the correct answer to your question, and then,
after that, I'm also going to give you the answer you expect.

The correct answer is: (Ryan2 the Expert in Answer #1 is correct) . . . . .

The force of gravity on a mass doesn't depend on what it's sunk in, surrounded by,
hanging from, or resting on. As long as it's on or near the Earth's surface, the force
of gravity acting on it is the same, no matter what else is around.

Force of gravity (weight) = (mass) x (gravity) = 627.2 kg x 9.8 m/s² = 6146.56 newtons
=============================================

The apparent weight is less, because when it's immersed in a fluid, there's
a buoyant force acting on it, which cancels part of the force of gravity.

The buoyant force = weight of the displaced water.

Assume the density of water is 1 kg per liter = 1,000 kg per m³.

Then the weight of 0.08 m³ of water is (80 kg x 9.8 m/s²) = 784 newtons.

This is the upward buoyant force on the steel when it's in water,
and it makes the steel seem 784 newtons lighter in water. So the
apparent weight of the steel in water is

6146.56 minus 784 = 5362.56 newtons.

That's why you can pick up your big brother in the swimming pool.
The force of gravity on him doesn't change, but the buoyant force
in the water balances part of the force of gravity, and makes him
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If he could blow himself up like a balloon, and displace enough water
to weigh just as much as he really does, then the buoyant force would
cancel his weight completely, and he would totally float !

That's how steel ships float in water. They're shaped in a shape that can
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Answers

Explanation:

Alfred Wegener was a meteorologist and geologist. He was inspired by a map of continents to start the journey of explaining Earth's geological history. He gave the theory of continental drift which says that the continents of Earth have moved relative to each other over time. He used following evidences to support his theory:

1. The facing side of South America's and Africa's shoreline interlocks perfectly. Which implies they must have been joined together in history.

2. Fossil of same type of reptiles found on different continents separated by huge oceans.

3. Matching the rock pieces on either side of the Atlantic oceans.

Answer: The correct answer is: coastline fits between different continents, similar rocks and fossils on different continents

Explanation: I took the test

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Answers

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