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You push with a horizontal force of 56.0 against a 25.0 box, pressing it against a rough wall to hold it in place. The coefficients of kinetic and static friction between this box and the wall are
An aluminum bar 3.74m long has a rectangular cross section 1.09cm by 5.24cm . What is its resistance? What is the length of a copper wire 1.45mm in diameter having the same resistance?
Using what you know about electricity, hypothesize about how series resistors would affect current flow. What would you expect the effective resistance of two equal resistors in series to be, compar
We know potential difference (1200V), magnitude of the magnetic field (58 mT), nucleus is travelling perpendicular to the magnetic field and that the nucleus travels in a circular path with radius o
A) Find the force his arms must exert on him during the accelerating part of the chin-up.
A lawn mower has a flat, rod-shaped steel blade that rotates about its center. The mass of the blade is 0.508 kg and its length is 0.594 m. What is the rotational energy of the blade at its operatin
A constant horizontal pull of 8.50 N drags a box along a horizontal floor through a distance of 17.4M. (a) How much does the pull do or the box? (b) Suppose that the same pull is exerted at an angle
You push your physics book 1.50 M alone a horizontal tabletop with a horizontal push of 240 N while the opposing force of friction is 0.600 N. How much work does each of the following forces do on t
A 110-g ball collides elastically with a 350-g ball that is at rest. If the 110-g ball was traveling in the positive x-direction at 4.25 m/s before the collision, what are the velocities of the two
Assuming this is happening in a vacuum and that the ground has no net charge, what is the difference between the number of protons and the number of electrons in the second particle.
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?