Alejandro measured the speed of sound in different materials. He recorded his data in the table, as shown. Materials Speed (m/s)
rubber 60
air 343
lead 1,210

What can he conclude about the speed of sound in these materials?
A.
Sound travels faster in lead than in air or rubber.

B.
Sound travels slower in lead than in air or rubber.

C.
Sound travels faster in air than in lead or rubber.

D.
Sound travels slower in air than in lead or rubber.

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

When an object is heated it contracts. a. true b. false