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One block rests upon a horizontal surface. A second identical block rests upon the first one. The coefficient of static friction between the blocks is the same as the coefficient of static friction between the lower block and the horizontal surface. A horizontal force is applied to the upper block, and its magnitude is slowly increased. When the force reaches 43.0 N, the upper block just begins to slide. The force is then removed from the upper block, and the blocks are returned to their original configuration. What is the magnitude of the horizontal force that should be applied to the lower block, so that it just begins to slide out from under the upper block?
Two compact sources of sound oscillate in phase with a frequency of 120 Hz where the speed of sound is 340 m/s. What is the amplitude of the resultant wave at that point
Water at 20-C flows down an 80-m-wide parking lot at a constant depth of 5 mm. The slope of the parking lot is 0.0002. Estimate the flow rate and the maximum shear stress. Is a laminar flow assumption reasonable?
A 3.0 m tall, 64 cm diameter concrete column supports a 205,000 kg load. By how much is the column compressed? Assume Young's modulus for concrete to be 3.0?
Two spheres are cut from a certain uniform rock. One has radius 4.70cm. The mass of the other is seven times greater. Find its radius.
A thin spherical shell has a radius of 2 m and a mass of 380 kg, and its center is located at the origin of a coordinate system. Another spherical shell with a radius of 1 m and mass 105 kg is inside the larger shell with its center at 0.6 m on the x..
A 4 kg wooden block is at rest on a tabletop. A 0.03 kg bullet enters the block going at 800 m/s. How much time was the bullet in the block
A coil is wrapped with 282 turns of wire on a square frame with sides 12.2 centimeter. compute the average value of the induced emf
two nanowires are separated by 1.2 nm as measured by stm. inside the wires the potential energy is zero but between the
You use an electron microscope in which the matter wave associated with the electron beam has a wavelength of 0.0349 nm. What is the kinetic energy of an electron in the beam
If the orientation of the spacecraft is to be changed by 30.0°, for what time interval must the gyroscope be operated.
What is the total charge of the plutonium nucleus? (The neutral plutonium atom has 94 electrons.), What is the magnitude of the force on an electron at a distance of 9.75 Angstrom from the plutonium nucleus
An astronaut arrives at a new planet, and gets out his simple device to decide the gravitational acceleration there. Prior to this arrival, he noted that the radius of the planet was 7040 km. If his 0.400-m-long pendulum has a period of 1.0 s, what i..
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