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Questions and Answers
A 2 kg object at 80°C is dropped into 500 g of water at 20°C. If no heat is lost, what is the final temperature? (Specific heat of object = 0.5 J/g°C, specific heat of water = 4.18 J/g°C). Use: m1c1(Tf-T1) = m2c2(T2-Tf)
A 2 kg object at 80°C is dropped into 500 g of water at 20°C. If no heat is lost, what is the final temperature? (Specific heat of object = 0.5 J/g°C, specific heat of water = 4.18 J/g°C). Use: m1c1(Tf-T1) = m2c2(T2-Tf)
The final temperature can be found by solving the equation m1c1(Tf-T1) = m2c2(T2-Tf)
A resistor has a voltage of 240 V and a current of 5 A. What is its resistance?
A resistor has a voltage of 240 V and a current of 5 A. What is its resistance?
48 Ω
An electric circuit uses 3 A of current and a 10 Ω resistor. What is the voltage?
An electric circuit uses 3 A of current and a 10 Ω resistor. What is the voltage?
30 V
A device uses 1,500 W of power at 120 V. What is the current?
A device uses 1,500 W of power at 120 V. What is the current?
A 60 W bulb operates at 120 V. What is its resistance?
A 60 W bulb operates at 120 V. What is its resistance?
A circuit operates with 5 A of current and a resistance of 20 Ω. What is the power output?
A circuit operates with 5 A of current and a resistance of 20 Ω. What is the power output?
A 240 V appliance draws 10 A of current. How much energy does it use in 5 hours?
A 240 V appliance draws 10 A of current. How much energy does it use in 5 hours?
A light wave takes 10 minutes to travel from the Sun to Earth. How far is Earth from the Sun?
A light wave takes 10 minutes to travel from the Sun to Earth. How far is Earth from the Sun?
A wave has a frequency of 500 Hz and a speed of 340 m/s. What is its wavelength?
A wave has a frequency of 500 Hz and a speed of 340 m/s. What is its wavelength?
A metal block has a density of 8 g/cm³ and a volume of 50 cm³. What is its mass?
A metal block has a density of 8 g/cm³ and a volume of 50 cm³. What is its mass?
A person exerts a 250 N force on a 1.5 m² surface. What is the pressure exerted?
A person exerts a 250 N force on a 1.5 m² surface. What is the pressure exerted?
A car of mass 1,000 kg is moving at 20 m/s. What is its kinetic energy?
A car of mass 1,000 kg is moving at 20 m/s. What is its kinetic energy?
A machine does 3,000 J of work in 5 seconds. What is its power output?
A machine does 3,000 J of work in 5 seconds. What is its power output?
Flashcards
Heat Exchange Formula
Heat Exchange Formula
Heat lost by the hotter object equals heat gained by the cooler object until they reach thermal equilibrium.
Resistance Definition
Resistance Definition
Opposition to current flow, measured in ohms (Ω).
Voltage Formula
Voltage Formula
Voltage equals current multiplied by resistance (V = IR).
Current Formula
Current Formula
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Resistance Formula with Voltage and Power
Resistance Formula with Voltage and Power
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Power Formula with Current and Resistance
Power Formula with Current and Resistance
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Energy Definition
Energy Definition
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Energy Formula
Energy Formula
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Distance Formula
Distance Formula
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Wavelength Definition
Wavelength Definition
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Wavelength Formula
Wavelength Formula
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Density Definition
Density Definition
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Mass Formula using Density
Mass Formula using Density
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Pressure Definition
Pressure Definition
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Pressure Formula
Pressure Formula
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Kinetic Energy Definition
Kinetic Energy Definition
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Kinetic Energy Formula
Kinetic Energy Formula
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Power (Physics)
Power (Physics)
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Power Formula (Work and Time)
Power Formula (Work and Time)
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Specific Heat Definition
Specific Heat Definition
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Study Notes
- Specific heat of object = 0.5 J/g°C, specific heat of water = 4.18 J/g°C
- To find the final temperature when a 2 kg object at 80°C is dropped into 500 g of water at 20°C with no heat loss: m1c1(Tf-T1) = m2c2(T2-Tf)
- Resistance is calculated by Voltage / Current
- If a resistor has a voltage of 240 V and a current of 5 A, Resistance = 48 Ω
- Voltage is calculated by Current * Resistance
- If an electric circuit uses 3 A of current and a 10 Ω resistor, Voltage = 30 V
- Current is calculated by Power / Voltage
- If a device uses 1,500 W of power at 120 V, Current = 12.5 A
- Resistance can be calculated by Voltage² / Power
- If a 60 W bulb operates at 120 V, Resistance = 240 Ω
- Power is calculated by Current² * Resistance
- If a circuit operates with 5 A of current and a resistance of 20 Ω, Power = 500 W
- Energy is calculated by Power * Time
- If a 240 V appliance draws 10 A of current for 5 hours, Energy = 43.2 MJ
- Distance is calculated by Speed * Time
- If a light wave takes 10 minutes to travel from the Sun to Earth, Distance = 1.8 x 108 km
- Wavelength is calculated by Speed / Frequency
- If a wave has a frequency of 500 Hz and a speed of 340 m/s, Wavelength = 0.68 m
- Mass is calculated by Density * Volume
- If a metal block has a density of 8 g/cm³ and a volume of 50 cm³, Mass = 400 g
- Pressure is calculated by Force / Area
- If a person exerts a 250 N force on a 1.5 m² surface, Pressure = 166.7 Pa
- Kinetic Energy is calculated by (1/2) * Mass * Velocity²
- If a car of mass 1,000 kg is moving at 20 m/s, Kinetic Energy = 200,000 J
- Power is calculated by Work / Time
- If a machine does 3,000 J of work in 5 seconds, Power = 600 W
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Description
Explore essential physics formulas for heat transfer, electrical resistance, power, energy, and motion calculations. Learn to calculate final temperatures in calorimetry, resistance using Ohm's law, power in circuits, energy consumption, and distance based on speed and time. These principles are fundamental to understanding mechanics and thermodynamics.
