3. Give an example of an object that has: a. kinetic energy An ivplane as aamout

Question

3. Give an example of an object that has: a. kinetic energy An ivplane as aamout of Kindic energy in fleyht due to its lawae mass and fest loci ass cand b. mechanical potential energy movine due to its motion- 4. Calculate the amount of energy in a 5.5 kg mass that is moving at 12.4 m/s. 5. While exercising, a 35.0 kg child climbs up a set of stairs that is 5.0 meters tall total a. What is the weight of the child? How much potential energy does she have at the top of the stairs because of her distance off the ground level? b. Where did she get the energy to climb the stairs in order to have her potential energy at the top? (Energy cannot be created, only transferred) c.

Explanation / Answer

3 (a) Your answer is correct. However you can also give the simple example of a moving car. The moving car has kinetic energy due to its mass and velocity.

(b) Your answer is wrong. Potential energy is the energy due to position of the object.

A person at the top of a castle possesses potential energy because he is at a height h above the ground. A bear at the top of mountain posssesses potential energy due to its location.

(4) Energy of the mass, E = (1/2)*m*v^2

= (1/2)*5.5*12.4^2 = 422.84 Joule.

(5) (a) Weight of the child W = m*g = 35*9.81 = 343.35 N

(b) Potential energy gained by the child, PE = m*g*h = 35*9.81*5 = 1716.75 Joule

(c) The child possesses energy in his body in the form of calorie. This energy is converted into the potential energy.

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