Amortar is like a small cannon that launches shells at steep

angles. a mortar crew is positioned near the top of a steep

hill. enemy forces are charging up the hill and it is

necessary for the crew to spring into action. angling the

mortar at an angle of 0 = 49.0° (as shown), the crew fires

the shell at a muzzle velocity of 182 ft/s.

how far d down the hill does the shell strike if the hill

subtends an angle 0 = 38.0° from the horizontal? ignore

air friction.

Planck decided to assume that atoms could only vibrate at certain frequencies that were whole numbers eg 2f, 3f and so on. others used to think that atoms vibrate continuously

Answer;

hot magma rises and pushes up toward the lithosphere, and as it cools it cycles back down toward the core to be heated again.

explanation; convection currents are the circular pathways taken by a fluid that enhances heat transfer by the process known as convection which occurs in fluids.convection currents transfer heat from one place to another by mass motion of a fluid. earth mantle is in a semi-liquid state and behaves like any other fluid, rising up from the bottom of the mantle after becoming hotter and less dense from heat of the earth's core, as the rock loses heat into the earth's crust it becomes cooler and more dense, then sinking back down to the core, then repeating the cycle.