Melanie watched the path a baseball followed after a pitcher threw it. she noticed that the ball traveled horizontally away from the pitcher as well as downward toward the ground. what force caused the ball to accelerate in the downward direction when it was thrown applied force

electrical force

gravitational force

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.