PHYSICS HIGH SCHOOL

400J of heat is produced in 4 sec in 4ohm resistor.calculate yhe PD across the resistor.

Answers

Answer 1
Answer: Actually, after the information you gave, I expected you to ask for the voltage
across the resistor, so I'm not quite sure what you mean by 'PD'.  It could be the
"Potential Difference" or the "Power Dissipation" across the resistor.
Here are both answers:

Power Dissipation:
Power = Energy/time =  400 joules / 4 seconds = 100 joules/second = 100 watts.

Potential Difference (voltage):
Power dissipated by a resistor = (voltage)² / Resistance

100 watts = (voltage)² / 4 ohms

Multiply each side by 4 ohms:

400 watts-ohms = (voltage)²

Voltage = square root of 400 watts-ohms = 20 volts

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When electrons are moving we call it _______

Answers

It *can* be called "Dynamic Electricity".

Hope that helps a little bit XD.

You pull your sled through the snow a distance of 500 meters with a horizontal force of 200 newtons. How much work did you do?

Answers

The force applied to pull an object is 200 N and the distance it sleds through the snow is 500 meters, so the amount of work done over here is 1,00,000 Nm.

What is Work?

When an external force moves an object over a distance, at least a fraction of that force must be exerted in the displacement's direction. This is known as work in physics. By multiplying the length of the path by the component of the force acting along the path, work can be calculated if the force is constant. The work W is equal to the force f times the distance d, or W = f.d, to mathematically describe this idea.

According to the question, the given values are :

Distance, d = 500 meters

Force, f = 200 Newton

So the formula for work done= force× displacement

W = 200 × 500

W = 1,00,000 Nm

Hence, the work done over here is 1,00,000 Nm.

To get more information about Work :

brainly.com/question/28727910

#SPJ2

the answer will be u need to divide 500 by 200 so a force of 150 ig

What is the mechanical advantage of a wedge that is 2 inches at its widest part and has a sloped side with a length of 10 inches?a. 0.2b. 5c. 8d. 20

Answers

Answer:

B) 5

Explanation:

Mechanical advantage = D/W

= 10/2

= 5.

It has no unit because the inches in the length and width will cancel out.

If a device uses 280 watts of power a day, about how many kilowatt-hours will it use in 30 days?

Answers

Given: 280 watts power a day
            
Unknown: KwH=?in 30 days
Solution: 280 watt-hours per day/1000x30 days
               .28 x 30=n
Answer:8.4 kwh

dont answer 8.4, its wrong

Plato

What equation can be used to calculate the time of impact when you have the impulse and force applied to an object

Answers

Impulse = (force) x (length of time the force acts).

Divide each side by 'force' :

Length of time of the impact = (Impulse) / (force) .

Answer:

Answer is below

Explanation:

I = F △t

A man pushes on a box at an angle of 30.0° with a force of 20.0 N and the box moves across the floor. Which of the following component of the force do you use to calculate work?

Answers

Not sure what the given options are, but the answer is the horizontal component. This is given by Force x cos(angle), or Fcos(θ), where θ is the angle. In this case that would be 20cos(30) = 17.32N
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