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An archer shoots an arrow toward a 300 g target that is sliding in her direction at a speed of 2.30 m/son a smooth, slippery surface. The 22.5 g arrow is shot with a speed of 39.0 m/s and passes during the target, which is stopped by the impact. What is the speed of the arrow after passing during the target?
A car changes it speed from rest to 12 km/hr in 4sec .If the mass of the car is 2000 killograms what is the net force acting on the car
Calculate the energy needed to accelerate a spaceship with a mass m = 25 × 103 kg toa speed of 0.40c. Compare this number with the approximate annual energy usage ofEarth, 1021 J
A bat at rest sends out ultrasonic sound waves at 53.5kHz and receives them returned from an object moving directly away from it, What is the received sound frequency
A certain animal species is equally likely to have blue eyes or brown eyes. What is the entropy of this sample
Human blood contains plasma, platelets, and blood cells. To separate the plasma from other components, centrifugation is used. Effective centrifugation requires subjecting blood to an acceleration of 2000g or more.
A 14.0 bucket is lowered vertically by a rope in which there is 193 of tension at a given instant. What is the acceleration of the bucket? Is it up or down
A river has a steady speed of 0.490 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point, If the student can swim at a speed of 1.10 m/s in still water, how long does the trip take
Assume that electron-hole pairs are injected into n-type GaAs (Eg = 1.42 eV, mc = O.O7m0, mv= 0.5m0,) at a rate R = 1O^23 per cm3 per second. The thermal equilibrium concentration of electrons is n0 = 10^16 cm^3. If the recombination coefficient r..
An iron tower in is 340 meters tall on a cold day (=-8l4 degrees Celsius). What is the hight of the tower on a hot day whe the tempeture is 32.4 degrees Celsius
A thin rectangular plate of uniform areal density ? = 2.84 kg/m2 has length of 35.0 cm and width of 21.0 cm. Calculate the mass of plate
You drop a stone into a deep well and hear it hit the bottom 3.10 s later. This is the time it takes for the stone to fall to the bottom of the well, How deep is the well
a proton accelerates from rest in a uniform electric field of 638 nc. at some later time its speed is 1.28 x 106 ms.a
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