A teacher stands well back from an outside doorway 0.88 m wide, and blows a whistle of frequency 780 Hz. Ignoring reflections, estimate at what angle (s) it is not possible to hear the whistle clearly on the playground outside the doorway.

Why do solar eclipses move from west to east?

If steel is more dense that lake water, why can a boat float

Which sub-atomic particle is positively charged and found in the nucleus?

What is true about all uranium atoms? they each have the same number of nuclear particles. they each have the same number of neutral particles. they each have the same number of neutrons. they each have the same number of protons.?

Which area receives about the same amount of precipitation as the Arctic and Antarctic tundra? A. The Great Plains of the America Midwest B. The African savanna C. The Amazon rain forest D. The Gobi Desert

Why is it important to balance a chemical equation? A. It is not important to balance a chemical equal B. To make sure you have the correct products C. To make sure you have the correct reactants D. To obey the law of conservation of mass

The presence of icicles hanging off the eaves of a wood-framed structure is most likely due to: heavy snow followed by a thaw. improper insulation in wall cavities. use of a poor-quality roof sheathing material. lack of proper roof ventilation.

Both gravitational potential energy and kinetic energy depend on

How much work is done when a 105 g tomato is lifted 19.2 m?

Suppose a body has a mass of 60 kilograms and a velocity of 2 meters per second upward. What is the linear momentum?