Albert Einstein's formula "E=mc2" means energy equals the mass of an object multiplied by the speed of light squared. His theory means that the mass of an object, no matter how small, can be transformed into a tremendous amount of energy.
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.
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.
A:Potential energy is defined as the energy possessed by a body due to its position or height above the surface of the Earth. Water stored in a dam has potential energy. This potential energy has the capacity to do work.
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.
A:Absolute location is a place's exact spot on a map, while relative location is an estimate of where a place is in relation to other landmarks. Absolute location is defined by latitude and longitude measurements. Relative location is used in conversational language and for giving rough directions.
A:Petrol engines harness the energy created by petrol in the core of a car engine to propel the vehicle. Petrol is a high-energy fuel that releases large amounts of energy when ignited in an internal combustion engine.
A:A compound machine is a machine composed of two or more simple machines. Common examples are bicycles, can openers and wheelbarrows. Simple machines change the magnitude or direction of a force without any motor.
A:Laminar and turbulent flows are the two major forms of fluid flow, with laminar flow being an orderly flow with all the fluid molecules moving parallel in the direction of flow, whereas in turbulent flow, different streams of fluid form eddies and unpredictable currents in a different direction than the overall direction of flow. Which type of flow arises in a fluid depends on its speed relative to its viscosity and the size and shape of the pipe or other channel carrying the fluid. Viscosity is the resistance to flow, and more inherently viscous fluids are more resistant to turbulence.
A:According to Teach Engineering, a pulley system helps to perform work by switching directions of force and simplifying the movement of large objects. Different types of pulley systems include fixed, movable and multiple.
A:A pulley makes work easier by redirecting and amplifying force. It helps reverse the direction of an individual’s lifting force. As a user pulls a rope down, the pulley lifts the weight up. When two ropes and wheels are used, a pulley reduces the effort needed to lift a weight by half.
A:One cubic foot of helium can lift 0.062 pound, so 161.3 cubic feet of helium is needed to lift 10 pounds. A balloon containing this amount of helium must be approximately 6.75 feet in diameter at sea level.
A:Streamlining reduces air resistance by providing a smooth surface over which air flows easily and uniformly. Without streamlining, eddies formed on the trailing edges of objects create turbulent, low-pressure areas and increase air resistance, also known as drag.
A:The two main branches of mechanics are statics and dynamics. Static mechanics is the study of forces which are required to keep a body in equilibrium. Dynamics is the study of motion itself, and the forces producing it.
A:Air is a fluid because the force needed to deform it depends on how fast it is deformed, not on how much it is deformed. This differs from a solid, where the force needed to deform it remains the same whether it is done quickly or slowly.
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.
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.
A:The amount of force a person can exert depends on many variables, including that person's mass, the acceleration being used to exert the force, and the friction, gravity and other forces involved. According to Live Science, researchers found that boxers' punches can generate up to 5,000 newtons of force.