Physics High School

## Answers

**Answer 1**

Entropy and the second Law of Thermodynamics

Dissolving salt into water lowers the temperature which the water freezes, or at which the ice melts

Hope I helped! (:

**Answer 2**

Answer:

ok im not 100% sure but i think it would be A or C

Explanation:

i am so sorry if im wrong :(

## Related Questions

A movable piston having a mass of 8.00 kg and a cross-sectional area of 5.00 cm2 traps 0.430 moles of an ideal gas in a vertical cylinder. If the piston slides without friction in the cylinder, how much work is done on the gas when its temperature is increased from 17°C to 297°C?

### Answers

We can assume the process to be adiabatic such that we can make use of the formula:

W = R (T2 - T1) / (γ - 1)

W = 8.314 (297 - 17) / (1.4 - 1)

W = 700 J/mole

multiplying the number of moles

W = 700 (0.43)

W = 301 J

The work done is 301 J.

A 100 g aluminum calorimeter contains 250 g of water. The two substances are in thermal equilibrium at 10°C. Two metallic blocks are placed in the water. One is a 50 g piece of copper at 66°C. The other sample has a mass of 71 g and is originally at a temperature of 100°C. The entire system stabilizes at a final temperature of 20°C. Determine the specific heat of the unknown second sample.

### Answers

It would be nice if someone can help me

what velocity must a 1340kg car have in order to have the same momentum as a 2680kg truck traveling at a velocity of 15 m/s to the west

### Answers

IR = Q

Q = m . v

Qtruck = 2680 . 15

Qt = 40.200 kg . m/s

Then,

Qcar = Qt

m . V = 40 . 200

1340 . V = 40.200

V = 40 . 200 / 1340

V = 30 m / s

A car is moving with a uniform speed of 15.0 m/s along a straight path. What is the distance covered by the car in 12.0 minutes?

### Answers

Answer:

Distance, d = 10800 meters

Explanation:

Given that,

Speed of the car v = 15 m/s

Time taken, t = 12 minutes = 720 s

We need to find the distance covered by the car during this time. It is given by the product of speed and time. It is given by :

d = v × t

d = 10800 m

So, the distance covered by the car is 10800 meters. Hence, this is the required solution.

1.08 x 10 ^1 km Hope i helped

Explain how the complete cycle of how refrigerator works

### Answers

The compressor constricts the refrigerant vapour, raising its pressure, and pushes it into the coils on the outside of the refrigerator.

When the hot gas in the coils meets the cooler air temperature of the kitchen, it becomes a liquid.

Now in liquid form at high pressure, the refrigerant cools down as it flows into the coils inside the freezer and the fridge.

The refrigerant absorbs the heat inside the fridge, cooling down the air.

Last, the refrigerant evaporates to a gas, then flows back to the compressor, where the cycle starts all over.

Hope this helped! :)

You know that an object has momentum if a. it has a force acting on it.

b. it has mass and a force is acting on it.

c. it has mass and its position is changing.

d. it is stationary and has a force acting on it.

### Answers

Momentum = mass * velocity

So C

Option C is the correct answer because if position changes, velocity will also change.

Hope this helps!

Which of the following types of waves carries the most energy? a. radio

b. infrared

c. ultraviolet

d. microwave

### Answers

C.) ultraviolet

Ultraviolet because it is the most harmful of them all. Just like the x-rays, amirite?

Out of all options, "Ultraviolet waves" carry most energy

In short, Your Answer would be Option C

Hope this helps!

What does the term perihelion mean?

### Answers

The point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.

The answer to the question: "the number of times the sun will rise in two years " will be measured in _____. a. tens

b. hundreds

c. ones

d. thousands

### Answers

I think the answer is Ten. Hope i helped

just asking do you do K-12

Of the seven chambers in the masque of the red death, which room is the least popular, and why? a. the white room; because it is too plain.

b. the orange room; because it is too bright.

c. the violet room; because it is too cold.

d. the black room; because it is too frightening

### Answers

The correct answer is D.

Ignoring friction, the total amount of potential energy plus kinetic energy of a swinging pendulum bob will be _____. a. zero

b. small

c. large

d. constant

### Answers

If we neglect air drag force(air resistance) on simple swinging pendulum, total energy of the system remains conserved. In other words, potential energy + kinetic energy remains constant.

Hope this helps!

Maria feels overwhelmed by everything she needs to do for school by next week. How can she best manage this stress? by abandoning her studies to do other things

by talking to family, friends, and teachers for support

by focusing on just one task and forgetting the rest

by waiting until the last minute to get things done

### Answers

Answer: Option (b) is the correct answer.

Explanation:

Stress is a situation in which our mind or body feel the pressure from our surroundings, ideas or thoughts. Stress causes distress in the body and mind of an individual.

For example, Ria has not done her homework and she is worried what punishment might her teacher give her when she get to know this.

When can get relive from stress by talking about our thoughts or worries with an individual. The other person might help us solve our problems or he might suggest us in a better way.

Therefore, we can conclude that Maria best manage this stress by talking to family, friends, and teachers for support.

By Talking To Family , Friends , And Teachers For Support

What kind of electromagnetic radiation has the shortest wavelength?

### Answers

Gamma-rays have the shortest wavelength

What is the source of energy for the process of evaporation?

### Answers

Thewater cycleis driven primarily by the energy fromthe sun. Thissolarenergy drives the cycle by evaporatingwaterfrom the oceans, lakes, rivers, and even the soil. Otherwatermoves from plants to the atmosphere through the process of transpiration.

What is the net force acting on an object?

### Answers

A net force is the sum of all forces acting on an object. A net force is capable of accelerating a mass. For instance, if the wheels of a car push it forward with5 Newtonsand drag is3 Newtons, the net force is2 Newtons, forward.

What is the hypothesis of continental drift?

### Answers

Alfred Wegener proposed that the continents had once been joined and over time drifted apart

Rabbit ear size tends to decrease as latitude increases. this is an example of _____.

### Answers

I would assume gravity?

If you toss a stick into the air, it appears to wobble all over the place. specifically, about what place does it wobble?

### Answers

I would assume the end?

If the moment of inertia of the diver in a straight position is 14 kg⋅m2 and in a tucked position is 4.0 kg⋅m2 , by what factor is her angular velocity when tucked greater than when straight?

### Answers

I'm not really that familiar with this type of problem but I encountered this question before.

Is = moment ofinertia in straight position

It = moment ofinertia in tucked position.

Wt It = WsIs

Wt = Is/It ;

Ws = 14 kg m² / 4 kg m² = 14/4 = 3.5

Her angular velocity when tucked is 3.5 greater than when straight.

How to find total resistance in a parallel circuit?

### Answers

We can use the formula,

1/R = 1/r1 + 1/r2 + 1/r3 + ....

Hope this helps!