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What is the weight of a man with a mass of 75 kg in Newtons?
What is the weight of a man with a mass of 75 kg in Newtons?
735 N
What is the mass of Teacher John in slugs and in lbm if he weighs 180 pounds?
What is the mass of Teacher John in slugs and in lbm if he weighs 180 pounds?
slugs: 5.4; lbm: 180
What is the mass of a woman on a planet with gravity of 4 m/s² if her mass on Earth is 54 kg?
What is the mass of a woman on a planet with gravity of 4 m/s² if her mass on Earth is 54 kg?
54 kg
What would be the weight on the moon of an object that weighs 52 pounds on Earth?
What would be the weight on the moon of an object that weighs 52 pounds on Earth?
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What volume will 150 g of mercury occupy if its density is 13.6 g/cm³?
What volume will 150 g of mercury occupy if its density is 13.6 g/cm³?
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What is the weight density of a board measuring 2" x 6" x 5' that weighs 15 lbs and 4 oz?
What is the weight density of a board measuring 2" x 6" x 5' that weighs 15 lbs and 4 oz?
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What is the density of a system consisting of 2 kg of water and 120 liters of steam in a 50-liter vessel?
What is the density of a system consisting of 2 kg of water and 120 liters of steam in a 50-liter vessel?
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What is the density of lubricating oil with a specific gravity of 0.92?
What is the density of lubricating oil with a specific gravity of 0.92?
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What is the specific gravity of a plastic cylinder that is 100 mm long and has a mass of 1 kg?
What is the specific gravity of a plastic cylinder that is 100 mm long and has a mass of 1 kg?
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What is a woman's systolic blood pressure of 160 mm Hg in lb/in²?
What is a woman's systolic blood pressure of 160 mm Hg in lb/in²?
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What is the absolute pressure of a fluid in kPa if the gauge indicates 12 kPa and the outside pressure is 110 kPa?
What is the absolute pressure of a fluid in kPa if the gauge indicates 12 kPa and the outside pressure is 110 kPa?
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What is the absolute pressure inside a condenser if the vacuum gauge reads 65 kPa and the barometer indicates 1.013 bar?
What is the absolute pressure inside a condenser if the vacuum gauge reads 65 kPa and the barometer indicates 1.013 bar?
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What is the water pressure at the bottom of the sea at a depth of 3600 m with a specific gravity of 1.03?
What is the water pressure at the bottom of the sea at a depth of 3600 m with a specific gravity of 1.03?
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What is a worker's body temperature of 40°C in °F?
What is a worker's body temperature of 40°C in °F?
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What is the absolute temperature in Rankine if the air temperature is 85°F?
What is the absolute temperature in Rankine if the air temperature is 85°F?
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What is the temperature change in Kelvin if a room air conditioner causes a temperature change of −5.2°C?
What is the temperature change in Kelvin if a room air conditioner causes a temperature change of −5.2°C?
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What is the temperature change in °F for water entering an electric heater at 30°C and leaving at 38°C?
What is the temperature change in °F for water entering an electric heater at 30°C and leaving at 38°C?
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What is the velocity of water through the nozzle of a garden hose if the inner radius is 1.0 cm and water flows at 2.0 m/s?
What is the velocity of water through the nozzle of a garden hose if the inner radius is 1.0 cm and water flows at 2.0 m/s?
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What is the volume flow rate of air leaving a duct if 1 cubic meter per second of air enters with a density of 1.2 kg/m³?
What is the volume flow rate of air leaving a duct if 1 cubic meter per second of air enters with a density of 1.2 kg/m³?
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What is the density of a casting of an alloy weighing 74 g with a thickness of 0.125 inch and a diameter of 1.75 in?
What is the density of a casting of an alloy weighing 74 g with a thickness of 0.125 inch and a diameter of 1.75 in?
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What is the allowable depth a submarine can descend to withstand a pressure of 1.2 × 10^7 Pa?
What is the allowable depth a submarine can descend to withstand a pressure of 1.2 × 10^7 Pa?
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What is the absolute pressure in the condenser in bars when the condenser vacuum gauge reads 706 mm Hg at a barometric pressure of 755 mm Hg?
What is the absolute pressure in the condenser in bars when the condenser vacuum gauge reads 706 mm Hg at a barometric pressure of 755 mm Hg?
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What is the conversion of a pressure of 25 mm water to mm Hg?
What is the conversion of a pressure of 25 mm water to mm Hg?
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What is the gauge pressure of air in an automobile tire, converted from 0.21 lb/ft² to torr?
What is the gauge pressure of air in an automobile tire, converted from 0.21 lb/ft² to torr?
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What is a furnace temperature of 4500 °R expressed in °C?
What is a furnace temperature of 4500 °R expressed in °C?
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What is the temperature in Kelvin when the temperature reaches 41°C?
What is the temperature in Kelvin when the temperature reaches 41°C?
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What is the temperature of a patient reading 41°C in Fahrenheit?
What is the temperature of a patient reading 41°C in Fahrenheit?
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What is the temperature difference of 54.0 °F expressed in Kelvin?
What is the temperature difference of 54.0 °F expressed in Kelvin?
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What is the velocity of water leaving a smaller pipe connected to a larger pipe with given areas?
What is the velocity of water leaving a smaller pipe connected to a larger pipe with given areas?
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How fast is water traveling as it leaves a garden hose that fills a 25-L wastebasket in 120 s with a radius of 1.00 cm?
How fast is water traveling as it leaves a garden hose that fills a 25-L wastebasket in 120 s with a radius of 1.00 cm?
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What is the average speed of blood traveling in arteries given the aorta velocity and dimensions?
What is the average speed of blood traveling in arteries given the aorta velocity and dimensions?
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Study Notes
Weight and Mass
- Weight is the force exerted on an object due to gravity. It is measured in Newtons (N).
- Mass is the amount of matter in an object. It is measured in kilograms (kg).
-
Weight = Mass x Acceleration due to gravity (g)
- On Earth, g ≈ 9.8 m/s2
Density
- Density is the mass per unit volume of a substance.
- Density = Mass / Volume
-
Specific gravity is the ratio of the density of a substance to the density of water at 4°C.
- Specific gravity = Density of substance / Density of water
- Density of water ≈ 1 g/cm3 or 1 kg/m3
Pressure
- Pressure is the force per unit area.
- Pressure = Force / Area
- Gauge pressure is the difference between the absolute pressure and the atmospheric pressure.
- Absolute pressure is the total pressure at a point, including the atmospheric pressure.
- Vacuum pressure is the pressure below atmospheric pressure.
Temperature
- Celsius (°C) and Fahrenheit (°F) are commonly used scales for measuring temperature.
- Kelvin (K) is the absolute temperature scale.
- 0 K = -273.15 °C
- °F = (9/5)°C + 32
- °C = (5/9)(°F - 32)
Fluid Mechanics
- Flow rate is the volume of fluid flowing per unit time.
- Flow rate = Volume / Time
- Velocity is the speed of fluid flow.
- Velocity = Distance / Time
-
Continuity equation: For an incompressible fluid, the mass flow rate at any point in a pipe is constant.
- Mass flow rate = Density x Area x Velocity
Energy
- Energy is the capacity to do work.
- Potential energy is the energy stored due to an object's position.
- Kinetic energy is the energy stored due to an object's motion.
- Work = Force x Distance
Examples
-
Example 1: Weight of a man
- Mass of man = 75 kg
- Weight = 75 kg x 9.8 m/s2 = 735 N
-
Example 2: Volume of mercury
- Mass of mercury = 150 g
- Density of mercury = 13.6 g/cm3
- Volume = Mass / Density = 150 g / 13.6 g/cm3 = 11.03 cm3
-
Example 3: Flow rate of air
- Flow rate of air entering duct = 1 m3/s
- Density of entering air = 1.2 kg/m3
- Density of leaving air = 1.18 kg/m3
- Applying continuity equation:
- Mass flow rate entering = Mass flow rate leaving
- Densityentering x Areaentering x Velocityentering = Densityleaving x Arealeaving x Velocityleaving
- Velocityleaving = (Densityentering x Areaentering x Velocityentering) / (Densityleaving x Arealeaving)
- Velocityleaving = (1.2 kg/m3 x 0.2 m x 0.15 m x 1 m3/s) / (1.18 kg/m3 x 0.175 m x 0.125 m)
- Velocityleaving = 1.36 m/s
- Flow rate of leaving air = Arealeaving x Velocityleaving = 0.175 m x 0.125 m x 1.36 m/s = 0.03 m3/s
-
Example 4: Potential energy of suitcase
- Mass of suitcase = 30 kg
- Height = 35 m
- Potential energy = Mass x Acceleration due to gravity x Height = 30 kg x 9.8 m/s2 x 35 m = 10.3 kJ
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Description
This quiz covers fundamental concepts related to weight, mass, density, pressure, and temperature in physics. Understand the relationships between these physical quantities and their implications in real-world scenarios. Perfect for students seeking to reinforce their knowledge in introductory physics.
