A 25-gram paper cup falls from rest off the edge
of a tabletop 0.90 meter above the floor. If the
cup has 0.20 joule of kinetic energy when it hits
the floor, what is the total amount of energy
converted into internal (thermal) energy during
the cup’s fall?
(1) 0.02 J (3) 2.2 J
(2) 0.22 J (4) 220 J

Question

09-06-2015
Physics

Answered

A 25-gram paper cup falls from rest off the edge
of a tabletop 0.90 meter above the floor. If the
cup has 0.20 joule of kinetic energy when it hits
the floor, what is the total amount of energy
converted into internal (thermal) energy during
the cup’s fall?
(1) 0.02 J (3) 2.2 J
(2) 0.22 J (4) 220 J

Answer :

Other Questions

Why was the period between 460 and 429 BCE known as the "Golden Age" of Athens? A Athens had conquered all of its neighbors and was now very rich B Coins and we

Factor by completing the square x2-2x-168

What did John Calvin and Martin Luther have in common? They are founders of the Lutheran church. They broke with the Catholic Church. They printed the first Bib

Which quote from the Declaration of Independence shows that the colonists were influenced by John Locke's idea of a social contract? "That to secure these right

Which attorney general under President Wilson led a witch-hunt to round up communists in the 1920s? A. Mitchell Palmer B. Nicola Sacco C. William Howard Taft D.

Which term describes a person on the far right of the political spectrum? A. liberal B. moderate C. radical D. reactionary

A triangular sail has a perimeter of 25 m. Side a is 2 m shorter than twice side b, and side c is 3 m longer than side b. Find the length of each side.

which statement is a true statement a. a trapezoid is a regular polygon b. not all rectangles are parallelograms c. not all parallelograms are rectangles d. a t

What is the answer to 2/3[(15-6)-8(8+1)]

which can adapt to changes? (a) alleles (b) populations (c) offspring (d) individuals

W0lf93 W0lf93 · Answer 1 · 2017-05-13T06:57:07-04:00

So a cup falls from the table top to the ground and acquires 0.20 J of kinetic energy in the moment it hits the ground and we want to know what is the total amount of energy converted into thermal energy. While it is on the table, the cup has potential energy and the kinetic energy is 0. The potential energy of the cup is Ep=m*g*h where m=mass of the cup, g= gravitational acceleration of 9.81m/s^2 and h=height of the table. So Ep=0.025*9.81*0.9=0.220725 J. That potential energy converts into kinetic energy and into thermal energy via friction that the air is causing. So Ep=Ek+Efriction. From here: Efriction=Ep-Ek=0.220725 J-0.20J=0.020725J So the correct answer is (1) 0.02J