Which is the correct definition of a chemical reaction? A. Substances are mixed together. B. Substances interact to form new substances. C. Things change color. D. Substances melt.

A person walks along a road 2 miles and rests. Then taking another road, he travels 3 miles; and switching to a dirt path, he walks 2 miles before arriving at his destination. The distance the person has traveled is 7 miles. True False

A 1.55 kg1.55 kg falcon catches a 0.435 kg0.435 kg dove from behind in midair. What is their velocity after impact if the falcon's velocity is initially 26.5 m/s26.5 m/s and the dove's velocity is 4.95 m/s4.95 m/s in the same direction?

A substance has a density of 13.5 g/cm3. What is the volume of a 50 g block of this substance?

A 2 kg blob of putty moving at 3m/s slams into a 2 kg blob of putty at rest calculate the speed of the two stuck together blobs of putty immediately after colliding

What is the value of work done on an object when a 0.1x102-newton force moves it 30 meters and the angle between the force and the displacement is 25°?

They are generally thought to be blank naturally occurring emotions that are present from birth

If an aircraft is loaded 90 pounds over maximum certificated gross weight and fuel (gasoline) is drained to bring the aircraft weight within limits, how much fuel should be drained?

3. Shortwave radio is broadcast between 3.50 and 29.7 MHz, To what range of wavelengths does this correspond? Why do you suppose this part of the spectrum is called shortwave radio?

How does a star's temperature change as the star ages from a main sequence star to a red giant and from a red giant to a white dwarf?

What factors in the atmosphere seem to have the greatest effect in the amount of radiation received from the sun?