You have an evacuated, iron spherical shell and want to know how thick the shell wall is. however, you cannot cut open the iron shell to measure the thickness of the wall. the ball just floats once completely submerged in water, and you measure the outer diameter to be 58.7 cm. if the density of iron is 7.87 g/cm3, what is the thickness of the wall?

What happens to atoms and chemical bonds during a reaction?

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

What is the most useful equation for electric power?