In real machines, efficiency is always

Which statement is an example of the law of conservation of energy? A soccer ball eventually stops because its energy disappears. When a light bulb is turned on, electrical energy is converted to light and heat.

Complete : If the periodic time of an oscillating body is 0.1 sec ... So the number of complete oscillations in one minute is a - 10 b-600 c-120 d-60

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the melting of ice, and explain your predictions. How does temperature affect the spontaneity of this process?

How does current change under different polarity?

Find the average speed of a car that goes 80 miles in 3 hours.

16. A block is sitting on a ramp tilted from horizontal. The block is just about to slide. T he angle of the ramp relative to horizontal is 14 degrees. What is the coefficient of friction between the block and the ramp? a. 0.25 b. 0.97 c. 0.5 d. 0.

Assume that a friend hands you a heavy book to hold as he turns the combination lock on his locker. Which of you does more work?

A tube, open at only one end, is cut into two shorter (nonequal) lengths. The piece that is open at both ends has a fundamental frequency of 422 Hz, while the piece open only at one end has a fundamental frequency of 666 Hz.

Table tennis the path of a table-tennis ball after being hit and hitting the surface of the table can be modeled by the function h=-4.9t (t-0.42) where h is the height in meters above the table and t is the time in seconds.

A coat rack weighs 65.0 lbs when it is filled with winter coats and 40.0 lbs when it is empty. The base of the coat rack has an area of 452.4 in2.