1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
yanalaym [24]
3 years ago
9

What is power?

Physics
2 answers:
Scrat [10]3 years ago
7 0

This question asks you what power is.

Your answer would be B) Power is the rate at which work is done

Power is not the amount of work that is being placed, but is a rate that could be measured.

For example, when you use more power, you would get things done more quickly. When you use less power, you get things done less quickly.

A visual example of the rate of power is charging an electric car. The more power you use to charge the car, the more quicker the car gets charged.

People mistakenly get mixed up with answer choice A, due to the fact that they see the word "rate", but the rest of the statement is false.

Therefore, answer choice B) Power is the rate at which work is done would be the correct answer.

e-lub [12.9K]3 years ago
4 0

Answer:

B) Power is the rate at which work is done

You might be interested in
A pen contains a spring with a spring constant of 257 N/m. When the tip of the pen is in its retracted position, the spring is c
Mandarinka [93]

Explanation:

Below is an attachment containing the solution.

3 0
3 years ago
A car battery with a 12 V emf and an internal resistance of 0.11 Ω is being charged with a current of 56 A. What are (a) the pot
denpristay [2]

Answer:

Part a)

V = 18.16 V

Part b)

P_r = 345 Watt

Part c)

P = 672 Watt

Part d)

V = 5.84 V

Part e)

P_r = 345 Watt

Explanation:

Part a)

When battery is in charging mode

then the potential difference at the terminal of the cell is more than its EMF and it is given as

\Delta V = E + i r

here we have

E = 12 V

i = 56 A

r = 0.11

now we have

\Delta V = 12 + (0.11)(56) = 18.16 V

Part b)

Rate of energy dissipation inside the battery is the energy across internal resistance

so it is given as

P_r = i^2 r

P_r = 56^2 (0.11)

P_r = 345 W

Part c)

Rate of energy conversion into EMF is given as

P_{emf} = i E

P_{emf} = (56)(12)

P_{emf} = 672 Watt

Now battery is giving current to other circuit so now it is discharging

now we have

Part d)

V = E - i r

V = 12 - (56)(0.11)

V = 12 - 6.16 = 5.84 V

Part e)

now the rate of energy dissipation is given as

P_r = i^2 r

P_r = 56^2 (0.11)

P_r = 345 W

7 0
3 years ago
An incompressible fluid (water) is flowing through a pipe of diameter 20 cm with
sergey [27]

Answer:

115 kPa

Explanation:

Use Bernoulli equation:

P₁ + ½ ρ v₁² + ρgh₁ = P₂ + ½ ρ v₂² + ρgh₂

Assuming no elevation change, h₁ = h₂.

P₁ + ½ ρ v₁² = P₂ + ½ ρ v₂²

Plugging in values:

(582,000 Pa) + ½ (1000 kg/m³) (1.28 m/s)² = P + ½ (1000 kg/m³) (30.6 m/s)²

P = 115,000 Pa

P = 115 kPa

3 0
3 years ago
What is the molar mass of a gas if 1.30g of the gas has a volume of 245mL at STP? ...?
padilas [110]
First, we assume this as an ideal gas so we use the equation PV=nRT. Then, we use the conditions at STP that would be 1 atm and 273.15 K. We calculate as follows:

PV= nRT
PV= mRT/MM

1 atm (.245 L) =1.30(0.08206)(273.15) / MM
MM = 118.94 g/mol <--- ANSWER
5 0
2 years ago
A particular star cluster contains stars all with the same apparent magnitude of +4. Near the cluster (and at the same distance
777dan777 [17]

Answer:

3,000 stars.

Explanation:

Subtract the magnitude of the single star from the magnitude of the star cluster.

(+4) - (+1) = +3

Then multiply your answer by 1000

= 3,000 is a stars.

5 0
3 years ago
Other questions:
  • Why does the uv from the sun hurt our eyes. Plz help
    11·1 answer
  • calculate the force between two objects that have masses of 20 kg and 100 kg separated by a distance of 2.6 m
    15·1 answer
  • Light with a wavelength of 395 nm illuminates a metal cathode. The maximum kinetic energy of the emitted electrons is 0.76 eV .
    5·1 answer
  • What is the force felt by the electrons and the nuclei in the rod when the external field described in the problem introduction
    11·1 answer
  • Fill in the correct answers. A big wheel with twice the circumference of a small wheel will rotate with ____ the force and ___ t
    7·2 answers
  • Which terms describe the purpose of antennas on devices that use radio waves
    11·1 answer
  • Need physics help! (there’s a picture)
    11·1 answer
  • What is the equivalent resistance in this circuit?<br>What is the current in this circuit?
    10·2 answers
  • SEND HELP
    14·1 answer
  • If the roller coaster car in the above problem were moving with twice the speed(20m/s), then what would be its new kinetic energ
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!