FreeNotes
Kinetic energy is the energy possessed by an object due to its motion. The formula for kinetic energy is: KE=1/2mv2 Where: m is the mass of the object, v is its velocity. Graphical Analysis: Consider an object of mass mmm initially at rest. If a constant force F is applied to the object, the velocity increases. … Read more
Work in physics is defined as the product of the force applied to an object and the distance over which the force is applied, in the direction of the force. Mathematically, it can be expressed as: W=F⋅d⋅cos(θ) Where: W is work, F is the force applied, d is the displacement, θ is the angle between the force … Read more
A perpetual engine with an efficiency equal to 1 would theoretically be 100% efficient, meaning it converts all input energy into useful work with no waste energy. However, such a machine cannot exist due to the second law of thermodynamics, which states that some energy will always be lost as waste heat in any energy … Read more
Increasing the power of a machine typically leads to higher energy consumption. Power is defined as the rate at which energy is used, so if the power output of a machine is increased, it means that more energy is being consumed per unit of time. This can occur by increasing the work done by the … Read more
While it is possible that we could shift towards relying entirely on renewable energy sources in the future, this transition will depend on overcoming significant challenges. Renewable energy technologies, such as solar and wind, have become more efficient and cost-effective, but their intermittency (depending on weather and time of day) poses challenges for consistent energy … Read more
Using renewable energy sources such as wind, solar, and hydroelectric power significantly reduces environmental impact compared to non-renewable sources like coal, oil, and natural gas. Renewable energy sources are cleaner because they do not emit harmful pollutants such as carbon dioxide, sulfur dioxide, and nitrogen oxides, which contribute to air pollution, global warming, and acid … Read more
An LED light bulb with an efficiency of 80% does not violate the principle of energy conservation. The law of conservation of energy states that energy cannot be created or destroyed, only transformed. In the case of an LED light bulb, 80% of the electrical energy is converted into useful light, while the remaining 20% … Read more
When a bullet is fired from a gun, its kinetic energy is initially high due to its velocity. Upon striking the sand wall, the bullet penetrates and eventually stops. The kinetic energy of the bullet is converted into several forms of energy. Primarily, it is transformed into heat energy, which is absorbed by the bullet, … Read more
Kinetic energy is proportional to the square of the velocity of an object. The formula for kinetic energy is given by Ek=1/2mv2, where m is the mass and v is the velocity. If the velocity of the car is doubled, the kinetic energy will increase by a factor of four. This is because (2v)2=4v2, so … Read more
Centripetal force does no work on an orbiting satellite. This is because work is only done when a force has a component in the direction of the displacement of the object. In the case of a satellite in orbit, the centripetal force acts perpendicular to the satellite’s direction of motion (which is tangential to its … Read more