How much force is needed to prevent a body of mass 10 kg from falling

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

Ablock of steel has a density of 0.29lbs per cubic inch. if the block has dimensions of 1 inch by 1 inch by 3 inches, what is its weight? a. 0.29lbs b. 0.58lbs c. 0.87lbs d. 1lbs

What are igneous intrusions and extrusions