Choose the situation that is an example of heat transfer by radiation. a. an ice cube melts while you hold it in your hand. b. hot soup rises to the top of the bowl, while cooler soup sinks to the bottom. c. coastal temperature are cooler than temperatures in inland areas. d. the sun's energy is transferred through the vacuum of space to earth.

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.