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Question: A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 480 m. How fast can she swim in still water?
Two teams of nine members each engage in a tug of war. what is the tension in the section of rope between the teams
A gas bottle contains a mixture of Helium and Oxygen molecules O2 is diatomic. Calculate vrms for the Helium molecules
A rocket, which is in deep space and initially at rest relative to an inertial reference frame, has a mass of 84.1 x 105 kg, of which 6.63 x 105 kg is fuel. What is the rocket's thrust
A 5.00 gram bullet has a velocity of 300 m/s. It strikes a block of wood and penetrates to a distance of 2.00 cm. The average force of the block of wood on the bullet is
In a mass-spring system, the mass of the object is 80g and the spring constant is 200N/m. What is the period of oscillataions for this system
A solenoid is used as a rotor of an electrical motor. It is 10 cm long and 2 cm in diameter. The wire wrapped around it makes 1000 turns and has a resistance of 100 Ohms. find the electrical power delivered by the battery
A 1.00 kg sphere of radius 10.0 cm is rolling down a ramp with ramp angle 30 degrees. What is the acceleration of the center of mass of the sphere
Sodium ions (Na+) move at 0.858 m/s through a bloodstream in the arm of a person standing near a large magnet. what would be the magnetic force on the arm
In extremely cold weather conditions where the inside thermostat is set to 27 C and the outside temperature is -20C, How much energy might you lose in one week
A golf ball strikes a hard, smooth floor at an angle of 37.5 ° and, as the drawing shows, rebounds at the same angle. What is the magnitude of the impulse applied to the golf ball by the floor
Two charged particles are located on the x axis. The first is a charge +Q at x = -a. The second is an unknown charge located at x = +3a, What are the two possible values of the unknown charge
The crankshaft in a race car goes from rest to 3600rpm in 3.2s. How many revolutions does it make while reaching 3600rpm
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