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A mining cart is pulled up a hill at 20 km/h and then pulled back down the hill at 33 km/h through its original level. (The time required for the cart's reversal at the top of its climb is negligible.) What is the average speed of the cart for its round trip, from its original level back to its original level?
A jet with mass m = 1.3 × 105 kg jet accelerates down the runway for takeoff at 2.4 m/s2, What is the net vertical force on the airplane as it levels off
The storage of radioactive waste is a massive problem in the nuclear industry. how much waste will spill over the top if the lid becomes loose
Two concentric spheres of radii a and b> a have equal and oppposite charge Q when the potential diffrence between them is V. What is the capacitance of the spheres
Suppose a beam of 5.0 eV protons strikes a potential energy barrier of height 5.5 eV and thickness 0.59 nm, How long would you have to wait-on average-for one proton to be transmitted
A person walks first at a constant speed of 4.80 m/s along a straight line from point to point and then back along the line from to at a constant speed of 2.75 m/s. What is her average velocity over the entire trip
it's nighttime, and you've dropped your goggles into a swimming pool that is 3.2 m deep. How far are the goggles from the edge of the pool
a boy hears an eco of his own voice from a distant hill after 1s. The speed of the sound is 340m/s. What is the distance of the hill from the boy
A 43.0-kg child swings in a swing supported by two chains, each 2.92 m long. The tension in each chain at the lowest point is 346 N. Find the child's speed at the lowest point
A 6.50?Fcapacitor that is initially uncharged is connected in series with a 4500resistor and a 505 V emf source with negligible internal resistance. A long time after the circuit is completed (after many time constants), what are the values of the ..
If frame rate increases what happens to the PRF
A man driving a car toward a large vertical wall sounds his horn. The car is traveling at 92 km/h. What is the frequency of the car horn
A 932 kg rocket is motionless in space. To start moving, its main engine is fired for 7 s, during which time it ejects exhaust gases at 1205 m/s. What is the approximate mass of ejected gas
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