How can we deduce the units of energy from the definition of kineticenergy?
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How can we deduce the units of energy from the definition of kinetic
energy?
The kinetic energy is the energy required to move any mass m with velocity v. In other word work required to move any body.
In mathematically, it is half of product of mass and square of velocity. That is,
Using equation of motion,
Since body start from rest, so
So force required
So work done, to move object
So the kinetic energy is,
So unit,
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- A 51-kg box is being pushed a distance of 7.0 m across the floor by a force P→ whose magnitude is 185 N. The force P→ is parallel to the displacement of the box. The coefficient of kinetic friction is 0.21. Determine the work done on the box by each of the four forces that act on the box. Be sure to include the proper plus or minus sign for the work done by each force.In the figure, a 2.9 kg block is accelerated from rest by a compressed spring of spring constant 650 N/m. The block leaves the spring at the spring's relaxed length and then travels over a horizontal floor with a coefficient of kinetic friction k = 0.210. The frictional force stops the block in distance D = 7.5 m. What are (a) the increase in the thermal energy of the block-floor system, (b) the maximum kinetic energy of the block, and (c) the original compression distance of the spring? (a) Number (b) Number (c) Number XXX Units Units Units No friction DWhen plotting a particular kind of energy on a graph, when can we use the equation for the energy (for example, mv² for kinetic energy) to determine the shape of the energy graph? Never, because we have to take into account the other kinds of energy in the system to determine the shape Sometimes, if there are only two kinds of energy in the system Never, because the shape of an energy graph is not related the equation for that kind of energy Sometimes, if the horizontal axis on the graph is labeled with the indicator of the energy type Always, because the shape of a graph always depends on the equation, even if the variables in the equation do not appear on the graph Always, because we are allowed decide where to place y = 0
- A pendulum is a body that is suspended from a fixed point so that it can swing back and forth through an exchange of kinetic energy and gravitational potential energy. Using 1-2 sentences, explain what happens to the kinetic energy and gravitational potential energy of the pendulum at the highest point and at the lowest point of its swing.Once combined, the bullet+block system swing upward to a maximum height, h. In doing so, the kinetic energy of the system (just after colliding) is converted into gravitational potential energy. In terms of g, , , , and write these two energies below:Give a specific example of a system with the energy transformation shown. In the question, W is the work done on the system, and K, U, and Eth are the kinetic, potential, and thermal energies of the system, respectively. Any energy not mentioned in the transformation is assumed to remain constant; if work is not mentioned, it is assumed to be zero. U → ΔEth