He atmosphere is heated both by the sun and by the earth's surface. water radiates heat differently than land, so the air temperature over the ocean is usually different than the air temperature over land. the difference in air temperature over land compared to over water causes convection currents in the atmosphere. how would a person at the beach experience these convection currents?
a. they would feel that the sand is hot.
b. they would feel that the water is cold.
c. they would feel the heat of the sun.
d. they would feel wind as the air moves.

Ogle–2013–blg–0723 is an exoplanet that is similar to earth in size and proximity to its star. this exoplanet has mass m=4.18×1024kg and radius r=5.66×106m. an astronaut whose weight on earth is w=735n lands on the planet. a. calculate m, the mass of the astronaut. b. calculate gp? , the acceleration due to gravity on the surface of ogle–2013–blg–0723. c. calculate wp? , the weight of the astronaut on the surface of ogle–2013–blg–0723. d. calculate v, the minimum velocity required to put an object into orbit above ogle–2013–blg–0723. e. calculate t, the time required to complete an orbit around ogle–2013–blg–0723.

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?

What are some important factors to consider when choosing a warm-up before your workout?