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You and a friend have been given the task of designing a display for the Physics building that will demonstrate the strength of the electric force. Your friend comes up with an idea that sounds neat theoretically, but you're not sure if it is practical. She suggests you use an electric force to hold a marble in place on a sloped plywood ramp. She would get the electric force by attaching a uniformly charged semicircular wire near the bottom of the ramp, laying the wire flat on the ramp with each of its ends pointing straight up the ramp. She claims that if the charges on the marble and ring and the slope of the ramp are chosen properly, the marble would be balanced midway between the ends of the wire. To test this idea, you decide to calculate the necessary amount of charge on the marble for a reasonable ramp angle of 15 degrees and a semicircle of radius 10 cm with a charge of 800 micro-coulombs. The marble would roll in a slot cut lengthwise into the center of the ramp. The mass of the lightest marble you can find is 25 grams.
A driver travels 10 km east, 20 km north and 50 km in a direction 30 degrees south of west. What is the drivers average velocity if the trip takes 90 minutes
Electric bees. As they fly through the air, honeybees can pick up a small amount of electric charge, Find the magnitude of the electric force on the bee in the electric field just above Earth's surface, 130N/C directed vertically downward
Light moving from glass to air changes wavelength from 448.5 nm to 653.7 nm. find the frequency of the light in air
find the minimum size of the snowshoes needed.
Two cars of mass 2000 kg and 1000 kg, respectively, collide inelastically. Find the initial speed and direction of the lighter car
Just by the impact, the clay has speed v0 = 9 m/s, and the disk is rotating clockwise with angular speed w0 = 0.4 rad/s. Just following the impact, what is an angular speed of the combined system of wheel plus clay.
mars has a mass of about 6.4x10^23 kg, and its moon Phobos has a mass of about 9.6x10^15 kg. how far apart are mars and Phobos
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. find the tension in the tightrope
A freezer is used to freeze 2.0 L of water completely into ice. The water and the freezer remain at a constant temperature of T = 0 C, Determine the change in the entropy of the freezer
A hockey stick is swung with the average angular acceleration of 1.5 rad/s2. What is the angular velocity of the stick as it strikes the ball at the end of 0.8 second swing.
A block of mass 5kg is attached to a spring of 3000N/m and compressed a distance of 0.3m. What are the period, frequency, and angular frequency
What are the x and y components of the shell. What is the acceleration of the two blocks, in meters per second squared.
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