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Once the box in the previous problem is moving, what force must be applied to keep it moving at a constant speed if the coefficient of kinetic friction between the box and the floor is 0.30?
If the bird's feet are 4.1 cm apart, calculate the potential difference across its body. (The resistivity of the wire is 1.7 10-8 m) . Your response differs significantly from the correct answer.
A cooling fan is turned off when it is running at 900rev/min . It turns 800 revolutions before it comes to a stop. What was the fan's angular acceleration, assumed constant? How long did it take the
The electric field between the plates of a paper-separated (K = 3.75) capacitor is 8.24×10^4 V/m. The plates are 1.80 mm apart, and the charge on each plate is 0.795uC. Determine the capacita
A charge is accelerated from rest through a potential difference and then enters a uniform magnetic field oriented perpendicular to its path. The field deflects the particle into a circular arc of r
The work done by an external force to move a -8.20uC charge from point a to point b is 1.80×10^-3J . If the charge was started from rest and had 4.85×10^-4 J of kinetic energy when it r
An electron with speed vo= 2.61×107m/s is traveling parallel to an electric field of magnitude E= 1.03 × 104 N/C . How far will the electron travel before it stops? How much time will elap
A battery produces 41.9V when 7.20A is drawn from it and 48.7V when 1.90A is drawn. What is the internal resistance of the battery? What is the emf of the battery?
The emission at wavelength 501.5 nm creates a first-order bright fringe 21.90 cm from the central maximum. What is the wavelength of the bright fringe that is 31.60cm from the central maximum?
The electric field of a spherical Van de Graaff generator with a radius of 10 cm has a magnitude of 2.5E5 N/C near its surface. The field points radially outward. What is the magnitude of the electr
How many excess electrons must the water droplet have in order for the electric field to suspend it against gravity? ("Excess" electrons are those beyond the number needed for the droplet to be char
Consider an electron with an initial speed v0 = 29 Mm/s (1 Mm = 1 megameter = 1000 km = 1E6 m) that is traveling parallel to an electric field (v0||E) of magnitude E = 7.1 kN/C (1 kN = 1 kilonewton
The emission at wavelength 501.5 nm creates a first-order bright fringe 21.90cm from the central maximum. What is the wavelength of the bright fringe that is 31.60cm from the central maximum?
A uniformly charged thin rod is L meters long. The total charge on it is Q coulombs. It's placed along the positive Y axis, with one end at the origin. Find an expression for the electric field at t
If the resistance of each of the two conductors in the extension cord is 0.900?, what is the actual power delivered to the cleaner?
The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm (red) and 486 nm(blue). Light from a hydrogen lamp illuminates a diffraction grating with 500lines/mm
A student m = 97 kg runs at a velocity vi = 2.85 m/s before jumping on a skateboard. After jumping on the board the student has a velocity vf = 2.35 m/s. Part (a) Write an expression for the weight
A double-slit interference pattern is created by two narrow slits spaced 0.22mm apart. The distance between the first and the fifth minimum on a screen 62cm behind the slits is 5.9mm . What is the
A golf ball m = 0.135 kg strikes a vertical concrete wall elastically with a horizontal velocity of v = 17 m/s. Part (a) Write an expression for the magnitude of the impulse I experienced by the ball.
A 3.2cm wide diffraction grating has 1700 slits. It is illuminated by light of wavelength 520nm. What is the angle (in degrees) of the first diffraction order? What is the angle (in degrees) of the
Write an expression for the magnitude of the velocity of the student, vs, after throwing the book.
Write an expression for the magnitude of the system's initial momentum, Pi, in terms of m, v1i and v2i.
If the charge is moving at a speed of 3.7 × 104 m/s perpendicular to the magnetic field of the electromagnetic wave, find the maximum magnitudes of the (c) electric and (d) magnetic forces ex
The motion of the particle is expected to be a helix. Calculate the pitch and the radius of curvature of the particle's path.\ Show all steps in detail to get five star rating.
A particle with charge Q is located on the axis of a disk of radius R, at a distance' b' below the plane of the disk. What must R equal in terms of b if one-fourth of the electric flux from the char