Motion & Mechanics

A:

Breaking the sound barrier requires exceeding the speed of sound, which is approximately 761 miles per hour at seal level when the air temperature is 59 degrees Fahrenheit. As the temperature decreases, the speed of sound also decreases.

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  • What speed breaks the sound barrier?

    Q: What speed breaks the sound barrier?

    A: Breaking the sound barrier requires exceeding the speed of sound, which is approximately 761 miles per hour at seal level when the air temperature is 59 degrees Fahrenheit. As the temperature decreases, the speed of sound also decreases.
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  • What does momentum mean?

    Q: What does momentum mean?

    A: In physics, "momentum" is a property that describes an object's motion. Linear momentum, the momentum of an object moving in a straight line, is the mass of the object multiplied by its velocity.
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  • What is the law of the pendulum?

    Q: What is the law of the pendulum?

    A: The law of the pendulum, discovered by Galileo Galilei, states that swinging objects follow the same path and have a period between swings that remains constant. Galileo attracted immediate attention for the discovery, which was later used in clock regulation.
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  • Why does cork float on water?

    Q: Why does cork float on water?

    A: Corks float on water because it contains a lot of air making it less dense than water. Solids and liquids with less density float on denser liquids.
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  • What is an example of kinetic energy?

    Q: What is an example of kinetic energy?

    A: Because any moving thing or object has kinetic energy, there are many examples of this energy type, including a ball dropping into water, a car in motion and a moving arrow. However, there are different types or forms of kinetic energy.
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  • What are complex machines?

    Q: What are complex machines?

    A: A complex machine is a combination of two or more simple machines. A simple machine is one of the six basic devices that make work easier by changing the degree or direction of a force.
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  • What are types of potential energy?

    Q: What are types of potential energy?

    A: Potential energy is the stored energy of an object that has the potential to change to a different form of energy to do work. The types of potential energy are gravitational, elastic, chemical, electric and nuclear.
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  • What are radio waves used for?

    Q: What are radio waves used for?

    A: Radio waves are used to receive and transmit signals between two objects. These waves help to transfer signals from broadcasting stations to televisions and radios, and they are also used to transmit signals for cellular phones.
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  • When is friction unwanted?

    Q: When is friction unwanted?

    A: Friction is unwanted in any situation in which free and continuous motion of mechanical parts is necessary. Some examples include the moving parts inside of an engine, door hinges and water slides.
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  • What is a Venturi meter?

    Q: What is a Venturi meter?

    A: A Venturi meter is a flow measurement device, commonly utilized in the water supply industry. A Venturi meter specifically uses a converging section of pipe to increase flow velocity. A corresponding reduction in pressure permits a determination of the flow rate.
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  • What is the meaning of "swept volume"?

    Q: What is the meaning of "swept volume"?

    A: "Swept volume" is defined as the volume of fluid through which a piston or plunger moves when it makes a stroke in an engine, according to Oxford Dictionaries. The swept volume times the number of cylinders in an engine is known as the displacement, usually measured in liters. Calculating the swept volume is done by multiplying pi times the radius squared times the height of the chamber.
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  • How do you calculate net force?

    Q: How do you calculate net force?

    A: To calculate the net force, or unbalanced force, of a Newtonian object, find the sum of all forces presently acting upon it. These include gravity, friction and other forces depending on the scenario. You need only a few figures and computations to calculate an object's net force, which is required for acceleration and is expressed in Newtons.
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  • What is simple harmonic motion?

    Q: What is simple harmonic motion?

    A: In physics, simple harmonic motion refers to repetitive oscillation back and forth through a central or equilibrium position. A pendulum is a good example of a physical system that exhibits simple harmonic motion. The time taken to complete one full oscillation is called a time period.
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  • What is weightlessness?

    Q: What is weightlessness?

    A: Weightlessness, or microgravity, occurs when an object is in free fall, explains the U.S. National Aeronautic and Space Association. Gravity pulls the object in free fall at a faster rate due to the equivalence of the force of gravity to acceleration.
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  • What is gravitational energy?

    Q: What is gravitational energy?

    A: Gravitational energy is the movement of an object or mass that is caused by the pull of gravity. This is caused on Earth by the strong attraction of all other masses to be drawn back to Earth's center. An example of gravitational energy is water from a river tumbling over a cliff to form a waterfall.
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  • How does a water turbine work?

    Q: How does a water turbine work?

    A: Water turbines convert the motion of moving water into rotating mechanical energy by catching the water with large blades. They are important to the structure and function of hydropower plants. There are different models of water turbines, but all perform the same basic function of converting the energy of the moving water into the revolutions of a shaft.
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  • How do I define "polarity of water?"

    Q: How do I define "polarity of water?"

    A: The polarity of water is the net result of the overall negative charge of the oxygen atom and the overall positive charges of the two hydrogen atoms. The outcome is a difference in charge, or polarity, from one end of the molecule to the other.
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  • Why do ships float on water?

    Q: Why do ships float on water?

    A: Ships float because they displace enough water for the buoyancy force to be greater than the force of gravity acting on the ship. The displaced water attempts to return to its original position, now occupied by the ship, which pushes the ship up. This effect is known as buoyancy force. The strength of the force of gravity pulling down on the ship is affected by its weight. Whichever of these forces is stronger determines if the ship floats or sinks.
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  • What is the law of acceleration?

    Q: What is the law of acceleration?

    A: The law of acceleration is formally referred to as Newton's Second Law of Motion and defines the rate of acceleration as a product of the force exerted on the object and the mass of the object. The rate of acceleration increases as the net force increases. The inverse is true for mass, with the acceleration decreasing as the mass increases.
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  • How does sound travel?

    Q: How does sound travel?

    A: Sound travels in waves from a transmitter to a receiver through a medium. The wave is produced by the vibration of particles in mediums such as gases, liquids and solids. Because sound requires a medium of interconnected and interactive particles, it cannot travel in a vacuum such as space.
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  • How does mass affect speed?

    Q: How does mass affect speed?

    A: Mass does not affect speed directly, but it does affect how fast an object can change its speed by accelerating or decelerating. Objects with larger masses require more time for acceleration or deceleration compared to lighter objects.
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