What two factors determine the power of a machine or person?

What two factors determine the power of a machine or person?

A machine’s ability to do work is measured by two factors. These are (1) mechanical advantage and (2) efficiency. Mechanical advantage. In machines that transmit only mechanical energy, the ratio of the force exerted by the machine to the force applied to the machine is known as mechanical advantage.

How could you improve the amount of power you generate going up stairs?

Your potential power is limited by the strength of the muscles you used to climb the stairs. So if you want to generate more power, you need to strengthen those key muscles. The quadriceps muscle group in the front of each thigh is the main workhorse when you climb a stairway.

Which two physical quantities must be used to calculate the power developed by a student running up a flight of steps?

Answer: Multiply your weight by 9.81 — which accounts for the force of gravity — and then multiply the result by the stairway’s height. Divide the answer by your climbing time in seconds to determine how many watts of power you generated.

How is it possible for you to run up the same flight of stairs quicker than your friend does and yet you might have generated the same power?

You could run up a flight of stairs rapidly or you could climb the same stairs very slowly. Either way, you do the same amount of work because you apply the same force (equal to your weight) through the same distance (the height of the stairs.) Power is work per time.

What determine the power of a machine?

As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time. Thus, a Watt is equivalent to a Joule/second. Thus, the power of a machine is the work/time ratio for that particular machine. A car engine is an example of a machine that is given a power rating.

How do you determine the mechanical work done on a system?

When the force is constant and along the same line as the motion, the work can be calculated by multiplying the force by the distance, W = Fd (letting both F and d have positive or negative signs, according to the coordinate system chosen).

What factors determine power physics?

If work is done faster, power is higher. If work is done slower, power is smaller. Since work is force times displacement (W=F*d), and velocity is displacement over time (v=d/t), power equals force times velocity: P = F*v. More power is seen when the system is both strong in force and fast in velocity.

How does the power running up the stairs compared with walking up the stairs?

When you run up the stairs you are working much faster. While running up the stairs you have a higher power than when you walk up the stairs. You can see that the power was much higher while running the stairs than while walking. The standard unit for measuring power is the Watt.

What is the equation used for calculating power from force and velocity?

In the straightforward cases where a constant force moves an object at constant velocity, the power is just P = Fv.

How do you think power force energy and work are related in the analysis of energy and electricity?

Work is done when a force produces motion. And for doing work energy is required. This energy we get from the food which we eat and if work is done by machine, then energy is supplied by fuels or by electricity.

Which of the following describes the relationship between work and power when running or walking up a flight of stairs?

More energy is needed to do work faster (i.e. more power). Walking up the stairs is the same amount of WORK as running up the stairs. The rate at which work is done determines the amount of power that is generated while doing the work.

What two components make up mechanical power?

In physical sciences, mechanical energy is the sum of potential energy and kinetic energy.

How do you calculate the power you developed from your work?

Work (in joules) = your weight (in newtons) X the height of the stairs (in meters.) Now the power you developed is the work you did divided by the time it took, or: Power (in watts) = work (in joules) divided by the time (in seconds.) If we call the time it took for you to climb the stairs in seconds, T,…

How do you calculate the power of walking up stairs?

Determine the stairway’s height in meters — multiply the stairway’s height in inches by 0.025 to convert it to meters. You must also know your weight in kilograms — 1 pound equals 0.45 kilogram. Time yourself walking up the stairs and then plug the numbers into the equation, which states that power equals work divided by time.

What are some examples of physics lab activities?

A common physics lab involves quickly climbing a flight of stairs and using mass, height and time information to determine a student’s personal power. Despite the diagonal motion along the staircase, it is often assumed that the horizontal motion is constant and all the force from the steps is used to elevate the student upward at a constant speed.

How do you calculate the power required to elevate 20 passengers?

A good strategy would involve determining the work required to elevate one average passenger. Then multiply this value by 20 to determine the total work for elevating 20 passengers. Finally, the power can be determined by dividing this total work value by the time required to do the work.