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A propeller is modeled as five identical uniform rods extending radially from its axis. The length and mass of each rod are 0.793 m and 2.97 kg, respectively. When the propellor rotates at 517 rpm (revolutions per minute), what is its rotational kinetic energy?
_____Joules
A box slides across a frictionless floor with an initial speed v = 2.2 m/s. What is the shortest length of rough floor which will stop the box
Determine the dimentions (in cm) of a rectangular aluminum block (also 40 cm long) that would have the same resistance between the farthest opposing sides as the silver block (part a)
A hand-cranked AC generator is used to cause 0.65 A of current (rms), What is the minimum average rate at which work must be done on the generator
You & your friend peter are putting new shingles on a roof pitched at 25 degrees. You are sitting on the very top of the roof when peter, who is at the edge of the roof directly below you, 5.1m away, asks you for the box of nails. Rather than carr..
A heat engine absorbs 21000 J from a hot reservoir at 257 degrees C and expels 15000 J to a cold reservoir at 37 degrees C in each cycle. Find the theoretical efficiency and the actual efficiency
An ideal transformer's primary has 2000 turns and secondary has 50 turns. The primary is connected to a source of 120 V, Find the current in the secondary
a box sits on a horizontal wooden board. the coefficient of static friction between the box and the board is 0.25. you grab one end of the board and lift it up, keeping the other end of the board on the ground. what is the angle between the board ..
Consider the driven, damped harmonic oscillaror discussed in Section 13-8. Calculate the power dissipated by the damping force
A -6.0 diopter lens is held 10.0 cm from an ant that is 1.0mm high. What is the height of the image
A computer CD-ROM drive that operates on 120 V is rated at 50W when it is operating. What is the drive's resistance
A professor shipwrecked on Hooligan's Island decides to build a telescope from his eyeglasses and some coconut shells. Which lens should he use as the objective
A farsighted person has a near point of 50-cm from her eyes. She wants glasses that would let her see objects at a distance of only 25.00 cm from her eyes. Determine out the focal length of the glasses needed if the glasses are 2 cm and 3 cm from ..
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