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A 610 kg elevator starts from rest and moves upward for 3.50 swith constant acceleration until it reaches its cruising speed,1.63 m/s.
(a) What is the average power of the elevator motorduring this period?
(b) What is the average power during an upwardcruise with constant speed?
A slide projector needs to create a 86 cm high image of a 2.0 cm tall slide, What focal length does the lens need and How far should you place the lens from the slide
Electrons are injected into a chamber with a B field of 10T at a velocity of 10^7 m/s, the electrons will go into cyclotron orbit. What is the direction of the orbit
Two billiard balls are initially traveling toward each other at speeds of 1.05 m/s for ball 1 and 3.40 m/s for ball 2. Find their final velocities
A crate travels 30 m due to a constant force of 350 N. The friction can be neglected for the first 15 m. What is the final speed of the crate if it weighs 110 kg
Consider an equilateral triangle 12cm on a side. If a charge of 6*10^-5 C is placed at each vertex, find the force on the top charge.
A 10.0kg box having an initial speed of 3.0m/s slides along a rough table and comes to rest. Estimate the total change in entorpy of the universe. Assume all objects are at room temperature (293K)
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..
If a 4.0 kg mass goes 15 m/s in a circular path whose radius of curvature is 75 m, what is the force of tension in the string of the pendulum
Light precedes through three polarizing sheets. Unpolarized light enters the 1st sheet and the resultant vertically polarized beam continues through the 2nd and 3rd. What percent of the original intensity emerges from filter #1
an electron and a proton are fixed at a separation distance of 847 nm. find the electric potentialat their midpoint
A series ac circuit is shown. The inductor has a reactance of 80 Omega and an inductance of 200 mH. A 90- Omega resistor and a capacitor whose reactance is 130 Omega , are also in circuit. The rms current in the circuit is 1.3A. What is the phase ..
An oil drop (density = 0.80 grams/cm3) has a diameter of 2.30 ?m. (This is about the size of a bacterium.) (A) Find the mass of the drop, What is the value of the electric field
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