Halfway though a cross-country meet, a runner's speed is 4m/s. In the last stretch, she increases her speed to 7m/s. What is her change in speed?

A student used a yardstick to model elastic rebound. The student bent the stick without breaking it and then let the stock go. What does the bent stick represent in the student's model? A. The Rock's original shape B. A siesmic wave C.

Friction between solids can be most accurately defined as the force that opposes the sliding motion of two surfaces that are touching each other. A. True B. False

Define acid and base in terms of pH in a paragraph

What is the density of a 700 kg object with a volume of 649 m3? (Density: D = D = m over v.)

Which model of communication was originally described as a one-way process consisting of the following five questions: who, says what, in what channel, to whom, and with what effect?

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.