Plane mirrors produce images which Plane mirrors produce images which are always larger than the actual object. are always smaller than the actual object. are always the same size as the actual object. could be smaller or the same size as the actual object, depending on the placement of the object. could be larger or the same size as the actual object, depending on the placement of the object. Submit

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.