Using Newton's 2nd law, find and expression for vcritvcritv_crit, the speed of the block at the critical moment when the block leaves the surface of the globe. Assume that the height at which the block leaves the surface of the globe is hcrithcrith_crit.

Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? (a)gamma rays (b)visible light (c)infrared light (d)microwaves

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.