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An elevator has mass 670 kg, not including passengers. The elevator is designed to ascend, at constant speed, a vertical distance of 20.0 m (five floors) in 17.0 s and it is driven by a motor that can provide up to 37 hp to the elevator. What is the maximum number of passengers that can ride in the elevator? Assume that an average passenger has a mass of 68.0 kg.
A steel rod (? = 7860 kg/m3) has a length of 2.19 m. It is bolted at both ends between immobile supports. Initially there is no tension in the rod, because the rod just fits between the supports. Find the tension that develops when the rod loses 3..
A typical human eye is nearly spherical and usually about 2.5 cm in diameter. Find the approximate size of each image (coin and friend) on her retina
An 850g- iron block is heated to 370C and placed in an insulated container (of negligible heat capacity) containing 41.0g of water at 23.0C a).What is the equilibrium temperature of this system? The average specific heat of iron over this temperat..
As a engineer, you are designing a heat pump that is capable of delivering heat at the rate of 22 kW to a house. The house is located where, in January, the average temperature is 10°C.
What would the average wind speed (in m/s) for this month be at a height of 80 m if this site experiences a wind shear condition which matches a logarithmic law with a surface roughness of 0.1 m? f. Based on the roughness noted in e) above, how wo..
A thin, flat washer is a disk with an outer diameter of 14 cm and a hole in the center with a diameter of 3 cm. What is the electric field on the axis of the washer
Some GRIN material is made in the form of a doughnut. The inside diameter (the diameter of the hole in the doughnut) is 34 cm, What should be the highest, and the lowest refractive index of the material
2 moles of an ideal gas is allowed to expand from 0.002 m^3 to 0.02 m^3 while the pressure is held at 325000 pascals. Determine the net heat flow in or out of the system
A 0.70-kg mass attached to a vertical spring of force constant 140N/m oscillates with a maximum speed of 0.40m/s, Find the maximum magnitude of the acceleration
A parallel plate capacitor has plates 2.00 cm by 3.00 the plates are saparated by a 1.00 m thickness of teflon. find the capacitance of this device
Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. determine the resistivity of the leaf tissue
A 1.50 ? 103-kg car starts from rest and accelerates uniformly to 15.2 m/s in 11.3 s. Find the average power developed by the engine
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