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A step-up transformer has 24 turns on the primary coil and 780 turns on the secondary coil. what input current and voltage are needed
An electric motor rotating a workshop grinding wheel at a rate of 9.80x10^1 rev/min is switched off. how long does it take for the grinding wheel to stop
Consider laser eye surgery, in which laser light with a wavelength of 426 nm at a power output of 1.6 W is used to reattach a detached retina. how many photons are emitted by the laser
An air-filled toroidal solenoid has a mean radius of 15.1cm and a cross-sectional area of 4.95cm2, find the least number of turns that the winding must have
A cyclotron (see figure below) designed to accelerate protons has an outer radius of 0.333 m. Find the speed at which protons exit the cyclotron
Older freezers developed a coating of ice inside that had to be melted periodically; an electric heater could speed this defrosting process. What is the resistance of the wire
A 20 liter tank of helium is at a pressure of 172kPa at a temperature of 0 C. What is the speed of the helium atoms in the tank at this new volume
In an experiment 70 gram of ice at 0 degrees Celsius is dropped into 300 gram of water at 50 degrees Celsius. what is the final temperature of thermal equilibirium
A person with a black belt in karate has a fist that has a mass of 0.70 kg. What is the magnitude of the average net force
A high speed photograph of club hitting a golf ball is shown in the figure below. find the average force exerted on the ball by the club
A 218.7 kg satellite is in a circular orbit of 26,273 miles (42,300,000 m) in radius. What is the velocity (speed) of the satellite
An aircraft weighing 849 N is accelerated at 7 m/s/s for 13 seconds, at which time the aircraft launches. How much work was done on the aircraft
a car moving at 10.0 m/s encounters a bump that has a circular cross-section with radius of 30.0m, What is normal force exerted by the seat of the car
A double slit experiment is performed with sodium(yellow) light of wavelength 589.3nm and the interference pattern is observed on a screen 100 cm away. determine the separation between slits
While pacing in the hallway at a constant velocity, you drop a tennis ball so that it falls towards the floor. calculate the height above the floor from which the tennis ball is released
A 54.5-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.646 and 0.321, respectively. What horizontal pushing force is required to just start
During a cardiac cycle, the heart squeezes about 65g of blood on each contraction into the arterial circulation. what is the maximum force acting on the center of mass of the blood
A 4.5kg squid takes in 1.75kg of water while at rest, and then expels the water at a speed of 3.5m/s, calculate the work done by the squid's muscles during this process
A 62.35-kg person runs and jumps off a 2.46 m cliff at a velocity of 4.75 m/s into water. What is the total work (net work) of the jumper when he hits the surface of the water
A runner performs a standing hamstring curl in 1.5 seconds with the mass of the cuff weight and the lower leg 5 kg, How much mechanical work does the runner preform
Only two forces act on an object (mass=4.61 kg), as in the drawing. Find the direction (relative to the x axis) of the acceleration of the object
A swimmer, capable of swimming at a speed of 1.07 m/s in still water (i.e., the swimmer can swim with a speed of 1.07 m/s relative to the water), How long does it take the swimmer to cross the river
An unlikely weapon was once proposed which had all of the people in China to jump up and down simultaneously. Calculate what the speed of the Earth and the people would be after the collision
In a famous scene of a movie, Indiana Jones is dragged behind a nazi truck by his whip. Jones' mass is 90 kg, Find the Tension on the whip
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. Find the acceleration of the box