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Q1. The loaded cab of an elevator has a mass of 3.0 x 103 kg and moves 221 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?
Q2. A small grinding wheel has a moment of inertia of 4.0×10-5 kg m^2. What net torque must be applied to the wheel for its angular acceleration to be 160 rad s^2?
Q3. Which is most possible to hurt-being stepped on by a 300-lb man wearing loafers or being stepped on through a 100-lb woman wearing high heels?
A disk with a rotational inertia of 5.6 kg?m2 and a radius of 0.53 m rotates on a frictionless fixed axis perpendicular to the disk, The angular acceleration of the disk in rad/s2 is:
What gauge pressure must a pump produce to pump water from the bottom of the Grand Canyon (elevation 730 ) to Indian Gardens (elevation 1370 )
The width of the ribbon normal to a radius vector originationg at the star's center is much greater than the thickness of the ribbon in the radial direction.
The human eye can detect light intensities as small as about 8 10-23 W/m2. How does this force compare to the weight of an electron
The current in a 100 watt lightbulb is 0.700A . The filament inside the bulb is 0.120mm in diameter. What is the electron current in the filament
Unpolarized light travels throughout 2 linear polarizers. What (minimum) angle should the second polarizer be relative to the first polarizer (the difference between q1 and q2) so that the final intensity of light is 1/3 original value.
A 54-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.7 m/s, determine her altitude as she crosses the bar
An automobile travels on a straight road for 44 km at 49 km/h. What is the average velocity (in km/h) of the car during this 88 km trip? (Assume that it moves in the positive x direction.)
You have a wire of length L = 1.9 m for making a square coil of a dc motor. The current in the coil is I = 1.6 A, Find the maximum torque exerted on the coil
An X-ray photon with a wavelength of 0.260nm scatters from a free electron at rest. Find the initial momentum of the photon
a hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. estimate the length of the lake
A 54.00-cm guitar string under a tension of 55.000 N has a mass per unit length of 0.10000 g/cm. What is the highest resonant frequency
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