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Information is transmitted along a cable in the form of short electric pulses at 100,000 pulses/second. (a) What is the longest duration of the pulses such that they do not overlap? (b) What is the
A .80 meter radius wheel comes off truck that is going 15 m/s. it rolls down the road slowing to a stop after rolling 400 m assume constant deceleration and find: total revolutions, initial angular
Find angular acceleration and time needed for a spinning ball that has initial angular velocity of 5.5 rad/s to accelerate uniformly to a final angular velocity of 20.5 rad/s in 100 revolutions.
The speed of a transverse wave on a string is 420 m/s, and the wavelength is 0.12 m. The amplitude of the wave is 2 mm. How much time is required for a particle of the string to move through a total
An electron moves in a circular path perpendicular to a magnetic field of magnitude 0.295 T. If the kinetic energy of the electron is 4.00 x 10-19 J, find the speed of the electron and the radi
Children sled down a 44 m -long hill inclined at 25 degrees. At the bottom, the slope levels out. If the coefficient of friction is 0.12, how far do the children slide on the level ground?
A proton moves at a speed of 1,605 m/s in a direction perpendicular to a magnetic field with a magnitude of 0.58 T. If the proton is replaced with an electron, how will the magnitude of the force ch
A 310 g- paperback book rests on a 1200 g -textbook. A force is applied to the textbook, and the two books accelerate together from rest to 96 cm/s in 0.42 s . The textbook is then brought to a stop
A piano tuner stretches a steel piano wire with a tension of 765N . The steel wire has a length of 0.500m and a mass of 3.75g. What is the number n of the highest harmonic that could be heard by a p
A bicycle has wheels with a diameter of 0.680 m. It accelerates uniformly and the rate of rotation of its wheels increases from 181 rpm to 280 rpm in a time of 18.5 s. Find the linear acceleration o
Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 8.60 cm-3 and their speed is about 480 km/s. (a) Find the current density of these protons. (b) If Earth'
The magnitude J(r) of the current density in a certain cylindrical wire is given as a function of radial distance from the center of the wire's cross section as J(r) = Br, where r is in meters, J is
A proton moves at a speed of 1,560 m/s in a direction perpendicular to a magnetic field with a magnitude of 0.97 T. If the proton is replaced with an electron, how will the magnitude of the force ch
For a stunt plane flying at a speed of 420km/h , what is the minimum radius of downward curve a pilot can achieve without experiencing a red out at the top of the arc?
A wire carrying 12 A makes a 26 angle with a uniform magnetic field. The magnetic force per unit length of wire is 0.28 N/m . What is the magnetic field strength?
Suppose you wanted to push this crate up the ramp. The crate's weight is 100 N, and the maximum frictional force the ramp can exert on it is 20 N.
A charge q1 = 5 nC is placed at x = 0 and another charge q2 = -2 nC is placed at x = 2 .0 cm. Where should a third positive charge be placed on the x axis so that the net force on it is zero?
A ball is launched directly upward from ground level with an initial speed of 18 m/s. (Air resistance is negligible.) (a) How long is the ball in the air? (b) What is the greatest height reached by th
Two point charges of 50 nC are each placed at the two vertices of an equilateral triangle of side 2.0 m. Find the magnitude of the net electric field at the third vertex of the triangle.?
A blue car with mass mc = 484 kg is moving east with a speed of vc = 18 m/s and collides with a purple truck with mass mt = 1297 kg that is moving south with a speed of vt = 10 m/s . The two collid
However, the left shoe oscillating on spring L has twice the amplitude as the right shoe does on spring R. If spring L has constant k = 174 N/m, how much is the spring constant for spring R?
Extension cords are often made from 1.0 mm diameter copper wire. (a) What is the resistance per unit length of this wire? (b) an electric saw that draws 7.0 A of current is operated at the end of an
What diameter must a copper wire have if its resistance is to be the same as that of an equal length of aluminum wire with diameter 3.49 ?
A car whose wheels are of radius r feet is driven at a speed v. A pebble is thrown from one of the wheels. For very large v, what angle fives the maximum launch height?
A dish of hot food has an emissivity of 0.39 and emits 15 W of thermal radiation. If you wrap it in aluminum foil, which has an emissivity of 0.07, how much power will it radiate?