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lukranit [14]
2 years ago
12

How will the amount of power change if less work is done in more time?

Physics
1 answer:
yKpoI14uk [10]2 years ago
7 0

The amount of power change if less work is done in more time"then the amount of power will decrease".

<u>Option: B</u>

<u>Explanation:</u>

The rate of performing any work or activity by transferring amount of energy per unit time is understood as power. The unit of power is watt

Power = \frac{Work}{Time}  

Here this equation showcase that power is directly proportional to the work but dependent upon time as time is inversely proportional to the power i.e as time increases power decreases and vice versa.

This can be understood from an instance, on moving a load up a flight of stairs, the similar amount of work is done, no matter how heavy but  when the work is done in a shorter period of time more power is required.

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How much energy does a pair of 800w hair straighteners transfer every second?
babymother [125]
Power is a measure of the rate of energy or work done on a system. It has units of energy per time. In SI, Joules per second and is equal to the units of Watts. So, for an 800 Watts hair straightener, the energy transfer per second would be 800 Joules.
3 0
3 years ago
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A stream of warm water is produced in a steady-flow mixing process by combining 1.0 kg/s of cool water at 25 °C with 0.8 kg/s of
Tamiku [17]

Explanation:

The given data is as follows.

      m_{1} = 0.8 kg/s = 800 g,      C_{1} = 4.18 J/g^{o}C

     m_{2} = 1 kg = 1000 g,   T_{1} = (75 - T),

     T_{2} = T - 25

Now, according to the law of conservation of energy,

         m_{1}C_{1}T_{1} = m_{2}C_{2}T_{2} + mL

     800 \times 4.18 \times (75 - T) = 1000 \times 4.18 \times (T - 25) + 30000

      250.8 - 3.34T = 4.18T - 104.5 + 30

          T = \frac{325.3}{7.52}

              = 43.23^{o}C

Thus, we can conclude that temperature of the warm water stream is 43.23^{o}C.

4 0
2 years ago
When the current through an electromagnet ceases, what generally happens to the magnetic field?
kati45 [8]
When the current flow ceases, the magnetic flow also decreases
3 0
2 years ago
Question 8 (1 point)
sineoko [7]

Answer:

A

Explanation:

6 0
2 years ago
Light traveling through air encounter a second medium which slows the light to 2.7 x 10^8. What is the index of the medium?
kozerog [31]

Answer:

1.11

Explanation:

The index of the medium can be calculated using below formula

V= c/ n ............eqn(1)

Where V= velocity of the light is reduced to while traveling through the second medium= 2.7 x 10^8 m/s

n= index of the medium

c= speed of light= 3 x 10^8 m/s

Substitute for the values in eqn(1)

2.7 x 10^8 = (3 x 10^8 m/s)/ n

Making " n" subject of the formula, we have

n= (3 x 10^8 )/(2.7 x 10^8)

n= 1.11

Hence, the index of the medium is 1.11

5 0
3 years ago
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