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A spring with spring constant 72 N/m has one end attached to a peg on a horizontal surface, and another attached to a puck with mass of 0.34 kg that can slide on the surface. The relaxed length of the spring is 0.12 m. It is desired to put the mass into motion so that it rotates with constant speed at a radius of 0.28 m. (a) How fast does the puck need to move to make this possible. Ignore friction for this part of the problem. (b) Some 30 s later, the puck is observed to be going in a smaller circle of radius 0.22 m. Apparently it was not a perfect approximation to neglect friction after all! Find the work done by friction during the 30 s. Assume that we can still approximation the motion as circular in the final situation, even though friction is gradually slowing it down.
A small object slides along the frictionless loop-the-loop with adiameter of 3m. What minimum speed must it have at the top of the loop?
What, in the context of plate tectonics, is a plate? What and where are the lithosphere and the asthenosphere? Give a brief explanation of the concept of isostasy. Describe the three general types of plate boundaries.
Explain the physical reason for this observed behavior
q1. a proton orbits a long charged wire making 1.50 times 10 6 revolutions per second. the radius of the orbit is 1.60
In a museum exhibit, three equal weights are hung with identical wires. Each wire can support a tension of no more than 72.0N without breaking. Under these conditions, what is the tension in the middle wire
An LR circuit contains an ideal 60-V battery, a 51-H inductor having no resistance, a 21- resistor, and a switch S, all in series. what is the current in the circuit
What is the magnitude of the electric field between the plates?
A lens for a 35 millimeter camera has a focal length given by f =61 millimeter. Compute the magnification of the image on the film
During an earthquake, the top of a building oscillates with an amplitude of 32cm at 1.3Hz. What is the maximum acceleration of the top of the building
How various g's of acceleration does the astronaut experience when the device is rotating at top speed? Each 9.80 m/s^2 of acceleration is 1 g.
The water in the plumbing in a house is at a gauge pressure of 160000 Pa. what force does this cause on the top of the tank inside a water heater if the area of the top is .4 m^2?
A 10.2 kg weather rocket generates a thrust of 200N. The rocket, pointing upwards, is clamped to the top of a vertical spring, whose spring constant is 500N/m and is anchored to the ground
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