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What is the kinetic energy of a block if a 6.8 kilogram block is sliding down a horizontal frictionless surface at a constant speed of 6 meters per second?
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A shopping bag is hanging straight down from your hand as you walk across a horizontal floor at a constant velocity does this force do any work while you are riding up an escalator at constant velocit?
When walking across a horizontal floor at a constant velocity, the force does no work because the displacement is perpendicular to the force. Similarly, when riding up an escalator at a constant velocity, the force of the bag does no work if the displacement is vertical and the force is vertical as well, assuming no change in height.
What happens to the kinetic energy when you increase the speed but keep the mass constant?
When you increase the speed while keeping mass constant, the kinetic energy increases. Kinetic energy is directly proportional to the square of the velocity, so as speed increases, kinetic energy increases even more rapidly.
What is the net force acting if an object is moving along a surface with a constant acceleration?
The net force acting on the object is equal to the product of the object's mass and its acceleration. This net force is responsible for maintaining the object's constant acceleration as it moves along the surface.
What happens to kinetic energy and potential energy in a closed system?
In a closed system, the total energy (kinetic + potential) remains constant, following the principle of conservation of energy. As kinetic energy increases, potential energy decreases, and vice versa. This continuous exchange between kinetic and potential energy allows the system to maintain a constant total energy.
How does the kinetic theory explain the fact that the pressure of a gas in a sealed container remains constant indefinitely provided the volume and temperature are kept constant?
The kinetic theory explains this by stating that gas particles are in constant, random motion. Even though individual particles collide with the container walls and exert pressure, the overall pressure remains constant over time due to the balance between the number of collisions and the force of each collision. As long as the temperature and volume are constant, the average kinetic energy of the gas particles also remains constant, leading to a consistent pressure.
During the swing of a frictionless pendulum what energy forms remain constant?
In a frictionless pendulum, the total mechanical energy (the sum of potential and kinetic energy) remains constant. This means that as the pendulum swings back and forth, the energy is continuously exchanged between potential and kinetic energy, but the total amount of energy remains the same.
How does the coefficient of kinetic friction vary with the the area of contact between the block and he horizontal?
The coefficient of kinetic friction remains constant regardless of the area of contact between the block and the horizontal surface. It is a property of the materials in contact and does not depend on the surface area.
A wooden block is released from rest at the top of a frictionless inclined plan and slides down to the bottomWhat convertions of energy are taking place as the block goes down the inclined plane?
As the wooden block slides down the frictionless inclined plane, potential energy is converted to kinetic energy. At the bottom of the incline, some of the kinetic energy will be converted back into potential energy due to the change in height. Overall, the total mechanical energy of the block (sum of potential and kinetic energy) remains constant throughout the motion.
One kilogram of gas has a much larger volume than 1 kilogram of a solid use kinetic theory to explain why?
Gas particles are in constant random motion with high kinetic energy, leading to greater separation between particles compared to solid particles which have low kinetic energy and are tightly packed. This results in the gas taking up a larger volume for the same mass as the solid.
The work required to accelerate an object on a frictionless surface from a speed v to a speed 2v is?
The work required to accelerate an object from speed v to 2v on a frictionless surface is equal to the change in kinetic energy, which can be calculated as 3/2 times the initial kinetic energy. This increase in kinetic energy corresponds to the work done by the force causing the acceleration.
How can an object accelerate if kinetic friction is equal and opposite to horizontal force which would mean it has a net force of zero?
It wouldn't accelerate. It would move at a constant velocity due to its tendency to keep moving (inertia) and friction being canceled out by the horizontal force.
As a block slides across a horizontal surface with constant velocity describe the changes of the energy that would occur within the block.?
As the block slides with constant velocity, its kinetic energy remains constant. The work done by friction converts some of this energy into heat, resulting in a decrease in the block's internal energy. Overall, the total mechanical energy (sum of kinetic and potential energy) of the block does not change.
How is energy in potential and kinetic conserved?
For any object, the summation of its potential and kinetic energies is constant.
What is the work done by the weight if a body is moving at constant speed over a firctionless surface?
If a body is moving at constant speed over a frictionless surface, the work done by the weight of the body is zero. This is because the weight force acts in the downward direction, perpendicular to the direction of motion, so there is no displacement in the direction of the weight force for work to be done.
A shopping bag is hanging straight down from your hand as you walk across a horizontal floor at a constant velocity does this force do any work while you are riding up an escalator at constant velocit?
When walking across a horizontal floor at a constant velocity, the force does no work because the displacement is perpendicular to the force. Similarly, when riding up an escalator at a constant velocity, the force of the bag does no work if the displacement is vertical and the force is vertical as well, assuming no change in height.
What happens to the kinetic energy when you increase the speed but keep the mass constant?
When you increase the speed while keeping mass constant, the kinetic energy increases. Kinetic energy is directly proportional to the square of the velocity, so as speed increases, kinetic energy increases even more rapidly.
A horizontal force of 100 N pushes a box across a floor at a constant speed. what is the force of friction acting on the box?
The force of friction acting on the box is equal in magnitude but opposite in direction to the applied force, so it is also 100 N. The friction force balances the applied force to keep the box moving at a constant speed.
