Sonar is the detection of sound waves reflected off boundaries in water. a region of warm water in a cold lake can produce a reflection, as can the bottom of the lake. which would you expect to produce the stronger echo? explain.

What is a half-life the reactive half of a radioactive substance the amount of time it takes for all of a radioactive substance to decay the amount of time it takes for half of a radioactive substancec to decay half the time it takes for a

What makes plants the beginning of the food chain

Which is better for prying open a stuck cover from a can of paint - a screwdriver with a thick handle or one with a long handle? Which is better for turning stubborn screws? Explain

What is the differnce between kinetic and potential energy

When white light is incident on a prism, which one of the resulting color components will have the lowest index of refraction? A. Green B. Yellow C. Orange D. Blue

A spring tide can occur at what day and month?

A superhero flies 285 m from the top of a tall building at an angle of 35◦ below the horizontal. What is the horizontal component of the superhero's displacement?

How does a substance's temperatura chanté when the average kinetic energy of its particles increases? When it decreases?

Because the moon rotates once for each revolution around Earth, Choose one answer. a. you see some phases more than others. b. a different side of the moon faces Earth each day. c. you never see the far side of the moon.

Planet A takes 1 year to go around its star at an average of 1 A. U. distance. Planet B is 4 A. U. from the star. Calculate how long Planet B takes to orbit.