PHYSICS HIGH SCHOOL

50 J of work was performed in 20 seconds. how much power was used to do this task?

Answers

Answer 1
Answer:
             Power = (amount of work done) / (time to do the work).

                         =                    (50 J)          /        (20 sec)

                         =      2.5 joule/sec  =  2.5 watts .
Answer 2
Answer:

The Correct answer to this question for Penn Foster Students is: 2.5 W

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How to find initial velocity

Answers

Answer:

Velocity= Distance divided by time divided by degree or direction.

Explanation:

Speed=DIstance divided by time
1.Initial Velocity Formula Questions:
2.Answer: The initial velocity can be found using the formula:
3.vi = vf - at.
4.Answer: The initial velocity can be found using the formula:
5.vi = vf - at.

As the wavelength of electromagnetic radiation increases _______.

Answers

The wider the waves are spread out, the longer it takes for each cycle to pass a given point. It's this—how FREQUENTLY waves pass a point—that determines the value of 'frequency'. If they are going by less frequently past that point, then the 'frequency' is less: it decreases.

Answer:

'frequency' is less: it decreases.

Explanation:

In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the A. cathode.
B. grid.
C. anode.
D. deflecting plate.

Answers

In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the grid. The correct option among all the options given in the question is option "B".When current issupplied to the heater, it causes the cathode to emit electrons. The electronspass through opening of the grid before reaching the anode. By controlling thenumber of electrons passing through the grid, the number of electrons reachingthe anode can also be controlled. 

Answer: B. GRID

Explanation: I JUST TOOK THE PF EXAM AND GOT IT CORRECT!!!!

Which statement best describes the superposition principle?A. If two in-phase waves arrive simultaneously at a point, their amplitudes add up.
B. If two out-of-phase waves arrive simultaneously at a point, their amplitudes add up.
C. If two in-phase waves arrive at a point one after another, their amplitudes add up.
D. If two out-of-phase waves arrive at a point one after the other, their amplitudes adds up

Answers

C. If two in-phase waves arrive at a point one after another, their amplitudes add up. 

Final answer:

The superposition principle states that when two in-phase waves arrive simultaneously at a point, their amplitudes add up.

Explanation:

The correct statement that describes the superposition principle is option A: If two in-phase waves arrive simultaneously at a point, their amplitudes add up. In-phase waves have the same frequency, wavelength, and direction. When two in-phase waves meet, the amplitude of the resultant wave is the sum of the individual amplitudes.

Learn more about superposition principle here:

brainly.com/question/30780170

#SPJ12

Why is a raindrop a particularly damaging element to soil

Answers

Answer:

Raindrops are considered damaging to the soil in the following ways:

  1. If it is too wet or too dry, nutrients in the soil can run off and not make it to the plants' roots, leading to poor growth and overall health.
  2. over-watering or too much rain can also lead to bacteria, fungus, and mold growth in the soil
  3. If the average rainfall is much lower or higher than the ideal, it can lead to significant problems, from drowned crops to lower yields.
  4. The soil can also start to collect bacteria, mold, and fungus, which can then be absorbed by the plant. While this isn’t as common in crops as it is in indoor plants, poor drainage and irrigation systems can lead to these types of growths taking control over your crops.
  5. raindrops when it is excessive can lead to erosion and leaching of the soil
  6. soil loss is mostly affected by increasing runoff discharge of rainwater                                      

Cheers!
Rain drop causes Erosion

You have a 90 W electrical appliance that is on 24 hours per day. At $0.51 per kWh, how much are you paying daily for electricity to operate this appliance?Show your calculations here:

Answers


90 watts = 0.09 KW

Energy = (power) x (time) =
                  (0.09) x (24) KWh

Cost = (energy) x (unit price) =
           (0.09 x 24) x ($0.51) = $1.10 per day (rounded)

(Those are very expensive kWh's.)
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