Which chemical reaction absorbs energy?

photosynthesis

explosion

current produced by a battery

combustion of fuels

activated hand warmers

A stone dropped from the root of a high buliding. A second stone is dropped 1.30 s later How far apart are the stones when the second one has reached a speed of 14.0 m/s

A pair of speakers on two sides of a stage are playing identical pure tones. When you stand in the center, equally distant from the two speakers, you hear the sound loud and clear.

Why do the stars appear to rotate around Polaris?

The voltage entering a transformer's primary winding is 120 volts. The primary winding is wrapped around the iron core 10 times. The secondary coil is wrapped around the core 4 times. What is the voltage leaving the transformer?

Each inner energy level of an atom has a maximum number of it can hold

Which best blocks X-ray particles and can therefore be observed more closely through the use of this technology?

A light ray travels inside a horizontal plate of glass, striking its upper surface at an angle of incidence of 50°. This ray is totally internally reflected at the glass-air boundary. A liquid is then poured on top of the glass.

A stationary object has no forces acting on it. True False

April swims 50 m north and then turns and swims 20 m back to the south. What is her velocity if it takes her 60 seconds?

What happens to the mass of an object when it is cooled?