PHYSICS HIGH SCHOOL

Which of the following happens in a heat pump?a. the compressor increases the pressure and temperature pf the refrigerant

b. the compressor blows cold refrigerant into the room

c none of the above

Answers

Answer 1
Answer: option c. none of the above

The heat pump is like an air conditioning unit. There is an air compressor inside it,the function is to convert power (using electric, diesel, gasoline) into potential energy stored in pressurized air (compressed air).By any means and methods, the prs

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A bullet leaves a gun with a horizontal velocity of 100 m/s. Calculate the distance it would travel in 1.3 seconds. a 1247 m b 0.013 m c 130 m d 76.92 m

What is the pendulum length whose period is 2.0s ?

Answers

Formula\ for\ period:\n\ T=2 \pi \sqrt{(L)/(g)}\n\ g-gravity=9,8 (m)/(s^2) ,\ L-pendulum \ length \n\n (T)/(2 \pi ) = \sqrt{ (L)/(g) }|square\n\n (T^2)/(2 \pi ) = (L)/(g) \n\n\ (T^2)/(2 \pi )*g=L\n\n L= (2^2)/(2*3,14 )*9,8= (39,2)/(6,28) =6,24mT=2 \pi \sqrt{(L)/(g)} \n (T)/(2 \pi ) = \sqrt{ (L)/(g) }|square\n (T^2)/(2 \pi ) = (L)/(g) \n (T^2)/(2 \pi )*g=L\n L= (2^2)/(2*3,14 )*9,8= (39,2)/(6,28) =6,24m

Select all the features that can be created by acidic water

Answers

Since you did not enumerate the features to choose from, I'll just give you a brief information about acidic water.

>Acidic water has a pH below 7 or less than 7.0.
> Acidic water can dissolve a limestone rock.
> The land features which are formed in limestone by reaction with acid water are the stalactites and the stalagmites.

A 5.0 g lead bullet is fired into a fence post. The initial speed of the bullet is 210 m/s, and when it comes to rest, half its kinetic energy goes into heating the bullet. How much does the bullet's temperature increase?

Answers

Given the data from the question, the bullet's temperature increases by 85.5 °C

How to determine the kinetic energy

  • Mass (m) = 5 g = 5 / 1000 = 0.005 g
  • Velocity (v) = 210 m/s
  • Kinetic energy (KE) =?

KE = ½mv²

KE = ½ × 0.005 × 210²

KE = 110.25 J

How to determine the increase in temperature

  • Kinetic energy (KE) = 110.25 J
  • Heat (Q) = ½KE = ½ × 110.25 = 55.125 J
  • Mass (M) = 5 g
  • Specific heat capacity of lead (C) = 0.129 J/gºC
  • Change in temperature (ΔT) =?

Q = MCΔT

Divide both side by MC

ΔT = Q / MC

ΔT = 55.125 / (5 × 0.129)

ΔT = 85.5 °C

Thus, the temperature increase is 85.5 °C

Learn more about heat transfer:

brainly.com/question/6363778
5g = 0.005 kg
So KE=1/2 0.005 kg * 210m/s^2 = 110 J.
Now the specific heat capacity of lead is 126 J/kgK, so the temperature change= 55 J / 0.005 * 126 J/kgK=87.3015873 K. Which, if normal thermal conditions, the bullet would have a temperature of around 360,451587 Kelvin or, simplified, 107.3 degrees celsius.

Energy waves traveling at the speed of light are called _____.conduction particles
convection waves
radiation
atomic energy

Answers

RADIATION

There are three types of heat transfer or heat propagation; conduction, convection and radiation. Heat transfer is the process by which heat projects externally however, depending on the temperature and pressure. Also called the movement of heat from a low temperatured state which increases as heat progresses.
Conduction is the heat transfer by contact, immediate contact.
Convection is the transfer of heat through air and water.
Radiation is the transfer of heat regardless of the presence of atoms or particles.

Radiation is the answer.

Why does water have a high surface tension?Hydrogen bonding keeps water molecules close together.
Water is a liquid at room temperature.
Water molecules contain 18 electrons.
The lengths of the bonds in water molecules can change.

Answers

Hydrogen bonding keeps water molecules close together.

Answer:

HYDROGEN BONEDNDED

Explanation:

What is the advantage of combining carbon from coal with steel?

Answers

The role of Carbon in steel is to increase hardness and tensile strength as well as response to heat treatment (hardenability). Increased amounts of carbon also reduces weldability. It is usually present to up to 2% carbon.
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