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A large tree trunk is floating in the sea. The density of the sea water is 1040 kg/m3, the density of the trunk is 720 kg/m3. What fraction of the trunk's volume is above the surface of the water?
What is the magnitude of the runner's total displacement . What is the phase difference between the two waves next they reach the observer.
A circular disk of mass 10.0 kg and radius 0.500 m rotates at 30.0 revolutions per second on a vertical axle, What is the final angular velocity of the combination of disks
Find out (a) capacitance and (b) maximum voltage that can be applied to a Teflon-filled parallel- plate capacitor having a plate area of 175 cm2 and an insulation thickness of 0.040 mm.
A 2.30 N force pushes it to the left, and a 0.800 N force pushes it to the right. (a) Taking right to be positive, what is the net force acting on it? (b) What is its acceleration?
q1. below are birds-eye views of six identical toy cars moving to the right at 2? various forces act on the cars with
You want to examine the hairy details of your favorite pet caterpillar, using a lens of focal length 8.9 cm that you just happen to have around. what angular magnification do you achieve
In a model AC generator, a 497 turn rectangular coil 7.0 cm by 26 cm rotates at 123 rev/min in a uniform magnetic field of 0.61 T. What is the maximum emf induced in the coil
A certain superconducting magnet in the form of a solenoid of length 0.30 m can produce a magnetic field of 13.0 T in its core when its coils carry a current of 105 A. The windings, made of a niobium-titanium alloy, must be cooled to 4.2 K. Find o..
A 168N sign is supported from its top surface by two ropes that each make a 22.5o angle with the horizontal. The sign is not moving. How much force is in each rope
An in compressible fluid is flowing through a pipe with a constriction. The wide section is 2.00 cm in diameter and is at the top of the pipe. What is the diameter of the narrow section for the pressure of the fluid in the narrow section to equal t..
An 81 kg boat that is 9 m in length is initially 7.8 m from the pier. A 20 kg child stands at the end of the boat closest to the pier. How far is the child from the pier when she reaches the far end of the boat
Estimate the heat flow when a double pane of glass is used with a 4.0 mm air gap between the panes? Each individual glass sheet is 4.0 mm thick
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