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You are standing at rest with respect to the earth holding a lance which you measure as 10 meters long and a knight traveling on horseback at .7c is holding a lance which he measures as 10 meters long. The knight charges with his lance held out toward you so you hold your lance out toward him. Which lance hits the other person first?
Assume a typical hummingbird has a lifespan of 4.0 years and an average heart rate of 1300 beats per minute. (a) Calculate the number of times a hummingbird's heart beats in its life, and express it in scientific notation.
A solenoid is wound with a single layer of copper wire of radius 0.370 cm. The solenoid is 4.50 cm in diameter and 1.60 cm long. What is the inductance of the solenoid per unit length
A 5.0 ice cube at -20 is in a rigid, sealed container from which all the air has been evacuated. How much heat is required to change this ice cube into steam
Under ambient conditions (T=300K ), the intrinsic electron concentration of silicon (Si) is ni=1.45*10^10cm^-3. Calculate the band gap energy of the semiconductor
Two people, A and B, with masses of 50-kg and 60-kg, correspondingly, stand on a frictionless surface 10m apart. B pulls on a connecting rope, giving A an acceleration of 0.92m/s2 towards B. a) what is B's acceleration toward A.
A father (m = 90 kg) and son (m = 45 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3 m/s after they have separated. How fast is the father moving.
Andy and Brad are lifting a 100 kg box to their apartment window using massless ropes. The ropes are tied to the same point on the box, Find the tensions in each rope.
Suppose you have an electric hot water heater for your house which is an aluminum cylinder which has a 0.46 m radius and is 2 m high. How much energy is lost through the walls of the hot water heater
imagine 1.0 stock tank barrel oil and 1000 scf gas that have been produced were somehow put back to reservoir at certain condition of pressure, what is the oil formation and solution gas oil ratio
A loudspeaker produces a musical sound by means of the oscillation of a diaphragm whose amplitude is limited to 2.0 μm. At what frequency (in Hz) is the magnitude a of the diaphragm's acceleration equal to g?
At an absolute pressure of 101.3 kPa and ten mperature of 20 degC the dynamic viscosity of a certain diatomic gas is 2*10^-5 Pa.sec, calculate its approximate relative molecular mass
A man weighing 650 and a woman weighing 440 have same momentum. What is the ratio of the man's kinetic energy to that of the woman.
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