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Two long, straight wires are perpendicular to the plane of the paper. Each wire carries a current of magnitude I. The currents are directed out of the paper toward you. What expression gives the mag
A clockwise current Icoil=2.0 A flows in the coil. A long straight wire carrying a current Iwire=31 A toward the left is located 0.05 m from the edge of the coil. The magnetic field at the corner of
Two forces on the object are F = 3.2N at 80 below the +x-axis and F = 3.2N at 40 above the -x-axis. Is there a third force on the object? Find the magnitude of the third force in Newtons and the dir
A positive 1.8 -uC charge moves at a speed of 3.1 x 10^6 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force that acts on the charge.
A proton traveling due north enters a region that contains both a magnetic field and an electric field. The electric lines point due west. It is observed that the proton continues to travel in a str
You design a simple friction-brake to stop the cylinder by pressing the brake against the outer rim with a normal force. The coefficient of kinetic friction between the brake and rim is 0.344.
Why is walking on soft sand so tiring? What is the basic physics behind walking on sand, compared with walking on concrete? Why is the rocker bottom shoe similar to walking on sand?
A solenoid that is 85.2 cm long has a radius of 1.67 cm and a winding of 1110 turns; it carries a current of 4.46 A. Calculate the magnitude of the magnetic field inside the solenoid.
Find (a) the x-component, (b) the y-component, and (c) the z-component of the force on the segment of the conductor that lies between x = x1 and x = x2. Express your answer in terms of the variables
A rod 42 cm long moves in a plane perpendicular to a magnetic field of 500 G. The velocity of the rod is perpendicular to its length. Find the speed of the rod if the potential difference between th
The mass of the drum is 150kg, and its radius is 0.76m.What is the magnitude of the torque the engine applies to the drum? Ignore the mass of the cable.
The electrical force on a pair of charges is 60 N. If those same charges are moved such that the new force between them is 15 N, what is the new distance between the charges?
An electric field is generated by a charge imbalance and the field is expressed by Coulomb's Law. What is the value (and UNITS) of the proportionality constant in Coulomb's Law?
Suddenly, the cheetah stops, turns, and then runs at 45 km/h eastward, as measured by a suddenly nervous crew member who stands alongside the cheetah's path. The change in the animal's velocity tak
The edges of a cube consist of equal resistors of resistance R, which are joined at the corners. Let a battery be connected to two opposite corners of a face of the cube. What is the effective resis
(a) Find the diameter of the image of Jupiter produced by the objective lens. (b) Find the angular size of Jupiter as viewed through the eyepieces. (c) How far should I place a marble (1-cm diameter
Snow is falling vertically at a constant speed of 6.5 m/s. At what angle from the vertical do the snowflakes appear to be falling as viewed by the driver of a car traveling on a straight, level road
At a certain instant, a 25-kg object is sliding eastward at a speed of 8.0 m/s, propelled by an eastward force of 125 N. The coefficient of kinetic friction between the object and the horizontal sur
A block of wood floats in fresh water with 0.596 of its volume V submerged and in oil with 0.855 V submerged. Find the density of (a) the wood and (b) the oil.
The mass of a tennis ball is 57.0 g, and the ball is typically in contact with the tennis racquet for 30.0 ms , with the ball starting from rest. Make a free-body diagram of the tennis ball during t
A 74.4-g arrow is fired horizontally from rest. The bowstring exerts an average force of 73.1 N on the arrow over a distance of 0.818 m. With what speed does the arrow leave the bow?
A beam of laser light with wavelength 612 nm is directed through a slab of glass having index of refraction 1.5. (a) For what minimum incident angle would a ray of light undergo total internal reflect
Determine the speed and centripetal acceleration of person situated at a latitude 30 degrees north of the equator. When solving this problem why don't you use the radius(r) to determine the speed an
They are labeled consecutively and a 10V battery is connected to nodes 1 and 3 (in other words, there are 2 resistors between the battery on one side of the hexagon, and 4 on the other side of the h
A spelunker is surveying a cave. She follows a passage that takes her a distance 173 straight west, then a distance 200 in a direction 45.0 east of south, then a distance 288 at 30.0 east of north.