A student is standing 8 m from a roaring truck engine that is measured at 20 dB. The student moves 4 m closer to

the engine. What is the measured sound intensity at the new distance?

dB

Which team will win? Team 1 includes people with : 10N, 7N, 7N, 5N, 5N Or Team 2 includes people with: 4N 4N, 4N, 8N, 5N, 12N

Matt is driving down 7th street. He drives 150 meters in 18 seconds. Assuming he does not speed up or slow down, what is his speed?

True or false air contains 78 percent hydrogen, 21 percent oxygen, and 0.03 percent carbon dioxide

An element's atomic number is 58. How many protons would an atom of this element have?

What effect does heating a solid to a high temperature have on its crystal lattice?

An example of a stable system

What causes chemical weathering? a. damage caused by animals and plants c. natural acids b. ice wedging d. physical factors

1. Strzała o masie 20 g tuż po wystrzale ma prędkość 50 m/s. Oblicz pracę wykonaną przez zawodniczkę. Ile wynosi energia potencjalna sprężystości napiętej cięciwy? 2. Na trampolinę o współczynniku sprężystości k=2 kN/m stanął zawodnik o masie 80 kg.

Two small plastic spheres between them has magnitude 0.22 N. What is the charge on each sphere is one the other? Explain whether it can be determined from the information give, whether the charges are positive or negative.

If it has enough kinetic energy, a moleculeat the surface of the Earth can escape the Earth's gravitation. The acceleration of gravity is 9.8 m/s2, and the Boltzmanns' constant is 1.38066*10-23 J/K.