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A block of wood, with density 780 kg/m3 has a cubic shape with sides .0330 m long. A rope of negligible mass is used to tie a piece of lead to the bottom of the wood. The lead pulls the wood into the water until it is just completely covered with water. What is the mass of the lead?
What principle is being used and how did you derive the formula?
The Balmer series in atomic hydrogen is the series of wavelengths emitted by the electron when it makes a transition from an energy level with n > 2 to the n = 2 level, Find the four largest wavelengths in the Lyman series
Imagine that you send out a light flash at t=6.0 s as registered by your clock, At what time did your brother actually make this silly face and How far is your brother away from you
Explain how much work does the gravitational force do on the block as the block travels from point P to (a) point Q and (b) the top of the loop?
A horizontal block-spring system with the block on a frictionless surface has total mechanical energy E = 49.2 J and a maximum displacement from equilibrium of 0.280 m.
An emf is induced in a conducting loop of wire 1.11m long as its shape is changed from square to circular.Find the average magnitude of induced emf if the change in shape occurs in 4.03s and the local 0.135-T magnetic field is perpendicular to the ..
A person is standing at the edge of the water and looking out at the ocean (see figure). The height of the person's eyes above the water is h = 1.8 m, and the radius of the Earth is R = 6.38 x 106 m. (a) How far is it to the horizon? In other word..
Three charges (q1 = 7.6 ?C, q2 = -4.7 ?C, and q3 = 1.1?C) are located at the vertices of an equilateral triangle with side d = 6.1 cm. q1 is on the bottom left, q2 is on the bottom right, and q3 is at the top.
A person wearing a seat belt can withstand an acceleration of -3.0 x 10^2 m/s^2. Explain how thick should barriers be to safely stop a car that hits a barrier at 110 km/h?
A disk of radius R = 9 cm is pulled along a friction less surface with a force of F = 15 N by a string wrapped around the edge. At the instant when d = 28 cm of string has unwound off the disk, what is torque exerted about the center of the disk.
A professor's office door is 0.95 wide, 2.2 high, 4 thick; has a mass of 22 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of door frame. When the door is open and at rest, the door closer exerts a torque of 5..
Sit on a rotating chair. Slowly twist your body in one direction and after that rapidly twist it in the other. What is going to happen? Is angular momentum conserved and if not why.
What is the magnitude of the maximum torque. What is the utmost load for this crane at an angle of 15° with the horizontal.
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