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An elevator has a mass of 1000 kilogram and carries a maximum load of 800 kilogram. A constant frictional force of 4000 Newton retards its motion upward. Find what must be the minimum power delivered by the motor to lift the elevator (fully loaded) at a constant speed of 3 m/s.
What is the minimum area (in square meters) of the top surface an ice slab 0.416 m thick floating on fresh water that will hold up a 1270 kg automobile? Take densities of ice and fresh water to be 917 kg/m3 and 998 kg/m3, respectively.
A conducting spherical shell of inner radius of a and outer radius b carries a net charge Q. find the surface charge density on the outer surface of the shell
Four identical metallic objects carry the following charges: +5.0 µC, +5.0 µC, -8.2 µC, and -4.0 µC. What is the final charge on each object
Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 27.0° above the horizontal. What is the magnitude of the net torque exerted on the branch by the children
Sound is considered an electromagnetic wave. The electric field in an electromagnetic wave is parallel to the magnetic field. An accelerating reference frame is considered as an inertial reference frame. In the photoelectric effect, light acts like a..
City A is 150. miles from City B. City C is 300. miles from City B. A pilot flew a plane directly from City A to City B. While making the trip, the plane’s compass indicated a heading of 130.° and its air speed indicator indicated a speed of 60.0 ..
A near-sighted person might correct his vision by wearing diverging lenses with focal length f = -60cm. use ray tracing to determine the height of the image
An airplane with a speed of 92.2 m/s is climbing upward at an angle of 37.7 ° with respect to the horizontal. determine the angle of the velocity vector of the package
A 3.7 kg bucket of water is raised from a well by a rope. find the force exerted by the rope on the bucket of water
a 117-cm-long 3.00g string oscillates in its n 3 mode with a frequency of 180hz and a maximum amplitude of 5.00mm.
A screw with 25 threads per centimeter is driven 1.49 cm into its fixture in 12.4 s with a cordless electric screwdriver. What is the average angular speed of the screwdriver
A position vector in the first quadrant has an x component of 8 m and a magnitude of 10 m. What is the value of its y component?
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