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Suppose you wish to make a solenoid whose self-inductance is 1.6 mH. The inductor is to have a cross-sectional area of 8.00 10-4 m2 and a length of 0.054 m. How many turns of wire are needed?
An 800 g ball moves in a vertical circle on a 1.07-m-long string. If the speed at the top is 5-m/s, after that the speed at the bottom would be 8.18 m/s.
The output from a one curie Co60 source is 1.25 R/hr at one meter. What is the radiation intensity at three meters from a 4 Curie source
A disk of mass M and radius R rotates around the z axis with angular velocity wI. What is the ratio of the initial to the final kinetic energies of the two-disk system
An asteroid is discovered heading straight toward Earth at 13km/s. An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 mins, after which the asteroid is moving at 28 degrees to its original path at a..
A student places an object on the 5.0 cm mark of the meter stick. He places a positive lens that he knows has a focal length of 15.0 cm at the 30.0 cm mark on the meter stick. From the data what is the focal length of the negative lens
What is the gravitational force of the moon on the earth and What is the gravitational force of the sun on the earth
A 52kg ballet dancer stands on her toes during a performance with four square inches (26cm2) in contact with the floor. What is the pressure exerted by floor over the area of contact in some cases.
A 120-V motor has mechanical power output of 3.00 hp. It is 88.0% efficient in converting power that it takes in by electrical transmission into mechanical power. Find the current in the motor
A fire hose 10 cm in diameter delivers water at the rate of 21kg/s . The hose terminates in a nozzle 2.6cm in diameter. What is the flow speed in the nozzle
A spring with spring constant 10N/m hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. What is its the mass of the ball
The electric field on the surface of a 12cm -diameter sphere is perpendicular to the sphere, What is the electric flux through the sphere
Use the value of the Sun's luminosity (3.90×10^26 watts, or 3.90×10^26 joules per second) to calculate what mass of hydrogen the Sun will convert into helium during its entire main-sequence lifetime of 1.2×10^10 years.
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