Peter knocks a book off the 0.9 m-high table and it falls to the floor. Karin picks it up and places it back on the table. What is the total change in the gravitational potential energy of the book?
A. *delta*Ug = 0 J
B. *delta*Ug = 2 |mg| (0.9 m)
C. *delta*Ug = -mv 2

The a992 steel rod bc has a diameter of 50 mm and is used as a strut to support the beam. determine the maximum intensity w of the uniform distributed load that can be applied to the beam without risk of causing the strut to buckle. take f.s. = 2 against bucklin

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

How does an observation about an object differ from an inference about that object