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An escalator in a shopping center is designed to move 33 people, 78 kg each, at a constant speed of 1.1 m/s at 45 degree slope. Determine the minimum power input needed to drive this escalator. What would this answer be if the escalator velocity were to be doubled.
Find out the average magnitude of the induced emf if the change in shape occurs in 4.24 {rm s} and the local 0.120-{rm T} magnetic field is perpendicular to the plane of the loop.
A string with a length of 0.7 m is fixed at both ends. What is the longest possible wavelength for the traveling waves that can interfere to form a standing wave on this string
Calculate the period of a ball tied to a string of length 0.3 m making 6.9 revolutions every second. Answer in units of s, Calculate the speed of the ball
A magnetic field is oriented at an angle of 43 to the normal of a rectangular area 6.2 by 5.9. what is the strength of the magnetic field
A ferris wheel at a local carnival has a radius of 20.0 m and it completes one revolution in 9.60 seconds. What is the speed of a point on the edge of the wheel
How far does Tinki drive before passing David.
A 56.0 kg cheerleader uses an oil-filled hydraulic lift to hold four 120 kg football players at a height of 0.900m. what is the diameter of the football players' piston
lady ate a whole medium size pizza storing up 120 food Calories. This energy is used to heat up 2 liters of water from a certain initial temperature to a final temperature of 80 deg.C, what was the initial temperature of the water?
a boy on a roof throws one ball downward and an identical ball upward. the ball thrown downward hits the ground with 100 J of kinetic energy. what is the kinetic energy of the second just before it hits the ground
An elderly sailor is shipwrecked on a desert island but manages to save his eyeglasses. How far apart are the lenses when the telescope is adjusted for minimum eyestrain
In the quark model of fundamental particles, a proton is composed of three quarks: two "up" quarks, each having charge +2e/3, and one "down" quark, having charge -e/3. Suppose that the three quarks are equidistant from one another. Take the distance ..
An object's true weight is 123 N. When it is completely submerged in water, its apparent weight is 82 N. what is the density of the object
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