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A river of width L moves uniformly with speed v.A canoe is to be paddled at a constant speed c with respect to the river. Calculate the time needed to paddle directly across the river and back to the original side, then finally aim the canoe upstream and paddle back to the start. Ignoring turn-around times, what is the round trip time?
q1. a .3kg baseball travelling at 48 ms approaches a waiting batter. when the ball is hit its back sailing away at 80
The period of oscillation of an object in a frictionless tunnel running through the Earth is 84.3 min. What is the time of oscillation of an object in a similar tunnel on the Moon.
A narrow beam of light containing red (660 nm) and blue (470 nm) wavelengths travels from air through a 1.60 cm thick flat piece of crown glass and back to air again. The beam strikes the glass at a 35.0° incident angle.
A mass of 500kg, with a velocity of 25m/s, hits a stationary mass of 200kg. The masses stick together after the collision. What is the velocity of the masses after the collision
A missile of mass 1.20 102 kg is fired from a plane of mass 4.85 103 kg initially moving at a speed of 3.35 102 m/s. what is the final velocity of the plane?
One mole of a ideal gas initially at temp To=0C undergoes an expansion at a constant pressure of 1atm to four times it original volume
The block is spun at 60 rpm, then the temperature of the rod is slowly increased. When the wax melts, the block slides out to the end of the rod. Determine the final angular velocity? Give your answer in rpm.
An electric field of 9.45 105 V/m is desired between two parallel plates, each of area 37.0 cm2 and divided by 2.45 mm of air. What charge must be on each plate.
As a spacecraft approaches a planet, the rocket engines on it are fired (turned on) to slow it down so it will go into orbit around the planet. how long (in minutes) must the engines be fired
A particle has a charge of +1.7 ?C and moves from point A to point B, a distance of 0.12 m. The particle experiences a constant electric force, and its motion is along the line of action of the force. The difference between the particle's electric..
Two trains on separate tracks move toward one another. Train 1 has a speed of 130km/hr and train 2 has a speed of 90km/hr. What is the frequency heard by the engineer on train
A machine in the factory needs 38 V to operate. The power in the factory is different from that, what is the voltage of the electrical power system in the factory
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