12. The symbol for wavelength True or False (write T or F in front of each problem #)
13. The phenomena that occurs when two waves passing through the same
medium meet up with one another is called refraction.
14. The main factor which effects the speed of a sound wave is the amplitude
of the sound wave.
15. When the particles of a medium are vibrating at right angles to the
direction of energy transported, then the wave is a longitudinal wave.
NI
16.A single disturbance that moves from point to point through a medium is
called a period

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.