Power - AP Physics C: Mechanics
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Calculate the power if 400 J of energy is used in 4 seconds.
Calculate the power if 400 J of energy is used in 4 seconds.
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100 W. $P = E/t = 400/4 = 100$ W.
100 W. $P = E/t = 400/4 = 100$ W.
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State the expression for power in terms of energy conversion.
State the expression for power in terms of energy conversion.
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Power = $\frac{\Delta E}{\Delta t}$. Change in energy per time interval.
Power = $\frac{\Delta E}{\Delta t}$. Change in energy per time interval.
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How much power is used when lifting a 50 kg mass at 2 m/s?
How much power is used when lifting a 50 kg mass at 2 m/s?
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Approximately 980 W. $P = mgv = 50 \times 9.8 \times 2 = 980$ W.
Approximately 980 W. $P = mgv = 50 \times 9.8 \times 2 = 980$ W.
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What is the unit of power equivalent to one joule per second?
What is the unit of power equivalent to one joule per second?
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Watt. Definition of the watt unit.
Watt. Definition of the watt unit.
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If a device consumes 1000 J in 2 s, what is its power rating?
If a device consumes 1000 J in 2 s, what is its power rating?
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500 W. $P = E/t = 1000/2 = 500$ W.
500 W. $P = E/t = 1000/2 = 500$ W.
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Identify the relationship between power, energy, and time.
Identify the relationship between power, energy, and time.
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Power = $\frac{E}{t}$. Fundamental power relationship.
Power = $\frac{E}{t}$. Fundamental power relationship.
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How much power is generated by a force of 25 N at 4 m/s?
How much power is generated by a force of 25 N at 4 m/s?
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100 W. $P = F \cdot v = 25 \times 4 = 100$ W.
100 W. $P = F \cdot v = 25 \times 4 = 100$ W.
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What is the power output if 500 J of work is done in 5 s?
What is the power output if 500 J of work is done in 5 s?
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100 W. $P = W/t = 500/5 = 100$ W.
100 W. $P = W/t = 500/5 = 100$ W.
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Convert 5 kilowatts to watts.
Convert 5 kilowatts to watts.
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5000 W. Kilo means thousand.
5000 W. Kilo means thousand.
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What is the definition of instantaneous power?
What is the definition of instantaneous power?
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Power at a specific moment in time. Power measured at one instant.
Power at a specific moment in time. Power measured at one instant.
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Calculate the power if a force of 10 N moves an object at 10 m/s.
Calculate the power if a force of 10 N moves an object at 10 m/s.
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100 W. $P = F \cdot v = 10 \times 10 = 100$ W.
100 W. $P = F \cdot v = 10 \times 10 = 100$ W.
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What is the average power output of a machine doing 1200 J in 12 s?
What is the average power output of a machine doing 1200 J in 12 s?
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100 W. $P = W/t = 1200/12 = 100$ W.
100 W. $P = W/t = 1200/12 = 100$ W.
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What is the unit of power in the International System of Units (SI)?
What is the unit of power in the International System of Units (SI)?
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Watt (W). One watt equals one joule per second.
Watt (W). One watt equals one joule per second.
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State the formula for power in terms of force and velocity.
State the formula for power in terms of force and velocity.
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Power = $F \cdot v$. Force times velocity when parallel.
Power = $F \cdot v$. Force times velocity when parallel.
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How is mechanical power defined?
How is mechanical power defined?
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Rate at which work is done. Energy transfer per unit time.
Rate at which work is done. Energy transfer per unit time.
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What is the power output of a motor doing 200 J of work in 5 seconds?
What is the power output of a motor doing 200 J of work in 5 seconds?
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40 W. $P = W/t = 200/5 = 40$ W.
40 W. $P = W/t = 200/5 = 40$ W.
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Convert 1 horsepower to watts.
Convert 1 horsepower to watts.
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1 horsepower = 746 watts. Standard conversion in physics.
1 horsepower = 746 watts. Standard conversion in physics.
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Identify the formula for instantaneous power.
Identify the formula for instantaneous power.
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Power = $\frac{dW}{dt}$. Derivative of work with respect to time.
Power = $\frac{dW}{dt}$. Derivative of work with respect to time.
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Find the power if a 10 N force moves an object at 3 m/s.
Find the power if a 10 N force moves an object at 3 m/s.
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30 W. $P = F \cdot v = 10 \times 3 = 30$ W.
30 W. $P = F \cdot v = 10 \times 3 = 30$ W.
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What is the unit of power in the International System of Units (SI)?
What is the unit of power in the International System of Units (SI)?
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Watt (W). One watt equals one joule per second.
Watt (W). One watt equals one joule per second.
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How is mechanical power defined?
How is mechanical power defined?
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Rate at which work is done. Energy transfer per unit time.
Rate at which work is done. Energy transfer per unit time.
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Determine the power if 300 J is used in 3 seconds.
Determine the power if 300 J is used in 3 seconds.
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100 W. $P = E/t = 300/3 = 100$ W.
100 W. $P = E/t = 300/3 = 100$ W.
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What is meant by average power?
What is meant by average power?
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Total work done divided by total time. Power over extended time period.
Total work done divided by total time. Power over extended time period.
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How is power related to energy?
How is power related to energy?
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Power = $\frac{E}{t}$. Energy per unit time.
Power = $\frac{E}{t}$. Energy per unit time.
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Identify the relationship between power, energy, and time.
Identify the relationship between power, energy, and time.
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Power = $\frac{E}{t}$. Fundamental power relationship.
Power = $\frac{E}{t}$. Fundamental power relationship.
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What is the power developed by a turbine producing 400 J in 4 s?
What is the power developed by a turbine producing 400 J in 4 s?
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100 W. $P = E/t = 400/4 = 100$ W.
100 W. $P = E/t = 400/4 = 100$ W.
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Determine the power if a 20 N force moves an object at 5 m/s.
Determine the power if a 20 N force moves an object at 5 m/s.
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100 W. $P = F \cdot v = 20 \times 5 = 100$ W.
100 W. $P = F \cdot v = 20 \times 5 = 100$ W.
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State the formula for power in rotational dynamics.
State the formula for power in rotational dynamics.
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Power = $\tau \cdot \omega$. Rotational power formula.
Power = $\tau \cdot \omega$. Rotational power formula.
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What is the power developed by a turbine producing 400 J in 4 s?
What is the power developed by a turbine producing 400 J in 4 s?
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100 W. $P = E/t = 400/4 = 100$ W.
100 W. $P = E/t = 400/4 = 100$ W.
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Determine the power if 300 J is used in 3 seconds.
Determine the power if 300 J is used in 3 seconds.
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100 W. $P = E/t = 300/3 = 100$ W.
100 W. $P = E/t = 300/3 = 100$ W.
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