Which statement is true about seismic waves?
A. They travel at the same speed through all types of matter.
B. They need a medium to travel through.
C. They can travel through a vacuum
D. They travel at the speed of light.

By what primary heat transfer mechanism does the sun warm the earth?

Abasketball star covers 2.65 m horizontally in a jump to dunk the ball. his motion through space can be modeled precisely as that of a particle at his center of mass. his center of mass is at elevation 1.02 m when he leaves the floor. it reaches a maximum height of 1.90 m above the floor and is at elevation 0.910 m when he touches down again. (a) determine his time of flight (his "hang time"). (b) determine his horizontal velocity at the instant of takeoff. (c) determine his vertical velocity at the instant of takeoff. (d) determine his takeoff angle. (e) for comparison, determine the hang time of a whitetail deer making a jump with center-of-mass elevations yi = 1.20 m, ymax = 2.45 m, and yf = 0.750 m.

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?