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1. A hollow cone (like a party hat) has vertex angle 2?, slant height L, and surface charge density ?. It spins around its symmetry axis with angular frequency ?. What is the magnetic field at the tip?
2. At the north magnetic pole the earth's magnetic field is vertical and has a strength of 0.62 gauss/ the earth's field at the surface and further out is approximately that of a central dipole. a) what is the magnitude of the dipole moment in joules/tesla? b) imagine that the source of the field is a current ring on the equator of the earths metallic core. which has a raidus of 3000 km (half of earths radius). how large would the current have to be?
After falling from rest from a height of 35 m, a 0.58-kg ball rebounds upward, reaching the height of 26 m. If the contact between ball and ground lasted 2.5 ms, what average force was exerted on ball.
A spring with spring constant 19 hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. It is then pulled down 2.5 and released. The ball makes 33 oscillations in 15 seconds. What is its utmost speed.
A small rocket to gather weather data is launched straight up. few seconds into the flight, its velocity is 110 and it is accelerating at 17 . At this instant, the rocket's mass is 50 and it is losing mass at the rate of 0.45 as it burns fuel.
Electromagnets that produce large magentic fields use water cooling to prevent excessive heating of the magnet's coils. How many liters of water must circulate by the coils each second if the temperature of the coils is not to exceed 49°C
A penny of mass 3.1g rests on a small 20g block supported by a spinning disk. The coefficients of friction between the block and disk are 0.75 (static) and 0.64 (kinetic).
hree identical small Styrofoam balls (m = 1.81g) are suspended from a fixed point by three nonconducting threads, What is the common charge q carried by each ball
What is magnitude of the linear acceleration of the hoop . Elucidate using Newton's Second Law of Motion, why you can throw a golf ball further than a bowling ball, still though you throw both at the similar angle and with the same amount of force.
An LRC circuit is connected to a 12.0-kHz , 745-V (rms) source, L = 28.0mH , R = 8.80k? , and C = 6350pF, Determine the total impedance
A person wearing a seat belt can withstand an acceleration of -310m/s squared. How thick should barriers be to carefully stop a car that hits a barrier at 120km/h.
A certain thin, uniform rod has a mass of 2 kg and length 3 m. To what shorter length must you trim it (discarding the smaller part) so that the remaining length has half the original moment of inertia about its end.
A jet plane lands with a speed of 98 m/s and can accelerate at a maximum rate of 5.90 m/s2 as it comes to rest. (a) From the instant the plane touches the runway.
How many packs of shingles can the contractor lift before he begins to slide down the roof assuming the following Contractor weights and values for the coecient of static friction exists between the contractor and the roof.
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