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The burning of gasoline in a car releasesabout 3.0 * 10^4 kcal/gal. If a car averages 38km/gal when driving90 km/h, which requires 20hp, what is the efficiency of the engine under those conditions?
A cart is propelled over an xy plane with acceleration components ax = 6.1 m/s2 and ay = -1.7 m/s2. what is the velocity of the cart when it reaches its greatest y coordinate
A 8.80-kg block of ice, released from rest at the top of a 1.33m--long frictionless ramp, slides downhill, reaching a speed of 2.61m/s at the bottom. What would be the speed of the ice at the bottom
A ray of light traveling through air encounters a 1.7cm -thick sheet of glass at a 42? angle of incidence. Assume n = 1.5. How far does the light ray travel inside the glass
A cart of mass 2m has a velocity of vo before itstrikes another cart of mass 3m at rest. What is the new velocity if the two carts couple and move together
guess the force between a proton and an electron at the Bohr radius of 0.5Å (1 Å=10-10 m). The magnitude of the charge of an electron, as well as a proton, is 1.6·10-19 C.
A 5.70-kg ball is dropped from a height of 12.0m above one end of a uniform bar that pivots at its center. The bar has mass 6.00kg and is 4.80m in length. At the other end of the bar sits another 5.10-kg ball, unattached to the bar. The dropped ball ..
A 400kg piano slides 4.0 m down a 30 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. Find out the force exerted by the man.
If 100 physics students each give off 100 W as they sit in the classroom taking an exam, estimate the temperature increase of the room during the hour-long test
The front 1.20 m of a 1600 kg car is designed as a "crumple zone " that collapses to absorb the shock of a collision. what is the magnitude of the average force on the car
An electron is suspended at a distance of 1.36 cm above a uniform line of charge. What is the linear charge density of the line of charge
What is the magnitude and direction of the net force on the box?
The angle of refraction of a ray of light traveling through a piece of fused glass quartz is 29°. Find the angle of incidence
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