A2.0-kg cart and an 8.0-kg cart are connected by a relaxed, horizontal spring of spring constant 300 n/m. you pull the 8.0-kg cart with some constant horizontal force. the separation between the carts increases for a short time interval, then remains constant as you continue to pull and the spring is stretched by 0.100 m. part awhat pulling force did you exert? assume that the direction of your pull is the positive direction. express your answer to two significant figures and include the appropriate units. part bif you instead pull the 2.0-kg cart, what force must you exert to get the same stretch in the spring? assume that the direction of your pull is the positive direction. express your answer to two significant figures and include the appropriate units.

In a wind tunnel the speed changes as the cross sectional area of the tunnel changes. if the speed in a 6' x 6' square test section is 100 mph, what was the speed upstream of the test section where the tunnel measured 20' x 20'? use conservation of mass and assume incompressible flow. conservation of mass requires that as the flow moves through a path or a duct the product of the density, velocity and cross sectional area must remain constant; i.e., that ova-constant. a model is being tested in a wind tunnel at a speed of 100 mph if the flow in the test section is at sea level standard conditions, what is the pressure at the model's stagnation point? (a) the tunnel speed is being measured by a pitot-static tube connected to a u- tube manometer. what is the reading on that manometer in inches of water? (b) at one point on the model a pressure of 2058 psf is measured. what is the local airspeed at that point?

How many hydrogen (h) atoms are in one molecule of sulfuric acid, h2so4? (1 points) 1 2 4 7

What is a carrier wave and how does it affect what you hear on the radio