A police siren sounds different as it comes close to you than when it moves away from you. what term explains how this happens?

a. diffraction

b. the doppler effect

c. rarefaction

d. shockwaves

Which of the following groups of atoms are most likely to have similar properties? nickel (28), calcium (20), bromine (35) aluminum (13), germanium (32), antimony (51) oxygen (8), selenium (34), tellurium (52)

Which of the following sets of driver's actions are multi-task performances necessary for the safe vehicle operation? a. Signaling; Changing Gears; Checking mirrorsb. Signaling; Brakes; Checking mirrorsc. Signaling; Changing Gears; Door opening

Two stones are launched from the top of a tall building. One stone is thrown in a direction 25.0cm above the horizontal with a speed of 18.0 m/s; the other is thrown in a direction 25.0cm below the horizontal with the same speed.

Why higher voltage means thinner cables and why it is then cheaper?

Two large crates, with masses 640kg and 490kg, are connected by a stiff, massless spring (K=8.1kN/m) and propelled along an essentially frictionless, level factory floor by a force applied horizontally to the more massive crate.

Which type of reaction will for a chemical bonded combination

What kind of change is salt dissolving in water

Which of these is the most effective way for manny to cool down after kickboxing? start static stretches to increase his flexibility walk around to lower his heart rate sit and catch his breath to avoid light-headedness run one to three miles to

One of the driving forces of plate motion is: A. volcanic eruptions along coastlines B. meteor impacts in the ocean basins C. convection currents in the mantle D. hot liquid magma in the inner core

Which element is required for the combustion of fossil fuels? nitrogen hydrogen oxygen carbon