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Scelta multipla
Which of the following activities uses the most amount of ?
A
A ball rolling at
B
A car traveling at
C
A bicycle moving at
D
A person walking at
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1
Understand the concept of kinetic energy, which is the energy an object possesses due to its motion. The formula for kinetic energy (KE) is given by: , where is the mass of the object and is its velocity.
Identify the objects involved in the problem: a ball, a car, a bicycle, and a person. Each has a different velocity and mass, which will affect their kinetic energy.
Convert the velocities from mph to a consistent unit, such as meters per second (m/s), to use in the kinetic energy formula. Use the conversion factor: 1 mph = 0.44704 m/s.
Estimate or find typical masses for each object: a ball (e.g., 0.5 kg), a car (e.g., 1500 kg), a bicycle (e.g., 15 kg), and a person (e.g., 70 kg). These values will be used in the kinetic energy calculations.
Calculate the kinetic energy for each object using the formula and compare the results to determine which activity uses the most kinetic energy.