Young jeffrey is bored, and decides to throw some things out of the window for fun. but since he is also very curious, he decides to do so in a controlled way, jeffrey takes a rock, his tennis ball, and one of his father's golf balls and sets them on the sill of an open window. then he uses a flat board to carefully push them all out of the window at the same time. the 2nd story window is 12.0 feet above the ground, and all three objects hit the ground just 0.500 feet away from the base of the house at the same time, 0.863 seconds after they're dropped. the rock hits with a thud and stays put, but the other two objects bounce. after another 0.647 seconds, the tennis ball reaches a maximum height of 6.75 feet, while the golf ball is 9.45 feet off the ground and still rising. both have travelled an additional 0.375 feet horizontally calculate the magnitude of the average velocity of each object during these 1.51 seconds. which object has the largest instantaneous velocity at the end of this time period?

Two horizontal plates with infinite length and width are separated by a distance h in the z direction. the bottom plate is moving at a velocity u. the incompressible fluid trapped between the plates is moving in the positive x-direction with the bottom plate. align gravity with positive z. assume that the flow is fully-developed and laminar. if the systems operates at steady state and the pressure gradient in x-direction can be ignored, do the following: 1. sketch your system 2. identify the coordinate system to be used. 3. show your coordinates and origin point on the sketch. list all your assumptions. 5. apply the continuity equation to your system. nts of navier stokes equations of choice to your system 7. solve the resulting differential equation to obtain the velocity profile within the system make sure to list your boundary conditions. check units of velocity 8. describe the velocity profile you obtain using engineering terminology. sketch that on the same sketch you provided in (1). 9. obtain the equation that describes the volumetric flow rate in the system. check the units.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Aforce of 100 newtons is used to move an object a distance of 15 meters with a power of 50 watts. find the work dine and the time it takes to do the work