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A 650kg elevator starts from rest. It moves upward for 3.0s by constant acceleration until it reaches its cruising speed of 1.75m/s. a) what is the average power of elevator motor through this time interval?
Find the electric energy density between the plates of a 225- parallel-plate capacitor. The potential difference between the plates is 360
An object 4.0 cm high is placed 12 cm in front of a diverginglens that has a focal length of – 8.0 cm. Describe by calculation the location, nature (real or virtual andupright or inverted), and size of the image for this location.
What voltage V_AC should an electron be accelerated during if the maximum energy photon it produces is to promote a hydrogen atom from the n=1 to the n=4 energy level?
A motion cart is nudged from the top of a 53° frictionless inclined plane that has one end propped up at a vertical height of 0.08 m. What is the final velocity of the cart
The pressure and volume of this gas are kept constant, while the number of molecules is doubled. Illustrate what is the final translational rms speed of the molecules?
a 3.77-kg ball of clay is thrown downward from a height of 3.47 m with a speed of 4.81 ms onto a spring with k 1690
Your job is to lift 30kg crates avertical distance of 0.90m from the ground onto the bed of a truck. How many crates for an average power output of 100W
Suppose you wish to fabricate a uniform wire from 1.30 g of copper. The wire is to have a resistance of R = 0.420 ?and all the copper is to be used. What must be the length of this wire
Unpolarized light with an intensity of 910 W / m2 is incident on a polarizer with an unknown axis. What is the angle between the axes of the polarizers
A concave mirror forms a real image twice as large as the object. The object is then moved such that the new real image produced is three times the size of the object. If the image was moved 62.5 cm from its initial position, how far was the objec..
In a certain binary-star system, each star has the same mass which is 9.6 times of that of the Sun, and they revolve about their center of mass. What is their period of revolution in years
Light travels a distance of 0.945m in 4.50ns in a given substance. What is the index of refraction of this substance
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