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## Author: Bruce Simons # a 1200-kg car moving on a horizontal surface has speed v=85

Posted By Bruce Simons

a 1200-kg car moving on a horizontal surface has speed v=85 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2 m. What is the spring stiffness constant of the spring? # A thin, circular disk of radius 30.0 cm is oriented in the y

Posted By Bruce Simons

A thin, circular disk of radius 30.0 cm is oriented in the yz-plane with its center at the origin. The disk carries a total charge of +3.00 μC distributed uniformly over its surface. Calculate the magnitude of the electric field due to the disk at # The flash unit in a camera uses a special circuit to “step u

Posted By Bruce Simons

The flash unit in a camera uses a special circuit to “step up” the 3.0 V from the batteries to 360 V , which charges a capacitor. The capacitor is then discharged through a flashlamp. The discharge takes 12 μs , and the average power # When using a double slit with light of wavelength 550 nm, it

Posted By Bruce Simons

When using a double slit with light of wavelength 550 nm, it is observed that the 4-th order maximum of the interference pattern occurs at the positions of the first minimum in the diffraction pattern. If the width of the slits is 0.39 mm, what # A homemade capacitor is made from a sandwich of a piece of p

Posted By Bruce Simons

A homemade capacitor is made from a sandwich of a piece of paper (7.0 in. by 13 in., 0.0033 in. thick) between two equal area sheets of aluminum foil. # Three equal negative point charges are placed at three of th

Posted By Bruce Simons

Three equal negative point charges are placed at three of the corners of a square of side d. What is the magnitude of the net electric field at the center of the square? (k=1/4πϵ0=8.99×109N⋅m2/C2 ) # three point charges lie along the x axis as shown in the fig

Posted By Bruce Simons

three point charges lie along the x axis as shown in the figure (no figure was given). the positive charge q1=15 mc is at x=2 m, the positive charge q2 =6 mc is at the origin, and the resultant force acting on q3 is 0. # When driven by a 124 Hz vibrator, a string has transverse wa

Posted By Bruce Simons

When driven by a 124 Hz vibrator, a string has transverse waves of 26 cm wavelength travelling along it. # A box is on the ramp of a parked moving-truck that forms an

Posted By Bruce Simons

A box is on the ramp of a parked moving-truck that forms an angle = 33 degrees with the horizontal. You are currently pushing horizontally (relative to Earth) on the box with a force Fyb=479 N to keep it from sliding down. The mass of # An AC power source has an rms voltage of 2.30 ✕ 10 2 V and

Posted By Bruce Simons

An AC power source has an rms voltage of 2.30 ✕ 10 2 V and operates at a frequency of 50 Hz. If a series RLC circuit is made from the power source, a 0.820 μF capacitor, a 11.0 H inductor and a 1.70 ✕