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Some sunglasses have half-silvered mirrors on them (on the front). Why can the wearer see through them, but no one else can see her yes behind the glasses?
An object, of mass m = 3 kg, is released from a height h = 5 m of the top of a rough 45 incline, Determine the maximum height on the left incline that the object will reach before sliding back again to the right
A wheel 2.25 m in diameter lies in a vertical plane and rotates about its central axis with a constant angular acceleration of 3.50 rad/s2, find the angular position of the point P
An electric motor rotating a workshop grinding wheel at 1.06 102 rev/min is switched off. How long does it take the grinding wheel to stop
The loaded cab of an elevator has a mass of 3.0 x10^3 kg and moves 171 m up the shaft in 23s at constant speed. At what average rate does the force from the cable do work on the cab.
A 2.1*10^3-kg car starts from rest atthe top of a5.0-m-long driveway that is sloped at 20 degrees with thehorizontal. find the speed of the car at the bottom of the drive way
compare the electric force holding the electron in orbit (r=0.53*10^-10m) around the proton nucleus of the hydrogen atom, What is the ratio of these two forces
What is the launch speed of a projectile that rises vertically above the Earth to an altitude equal to five times the Earth's radius before coming to rest momentarily
A 612 kg elevator starts from rest and moves upward for 4.00 s with constant acceleration until it reaches its cruising speed, 1.84 m/s. What is the average power of the elevator motor during this period
The rope makes an angle of 70.0 degrees with respect to the vertical as shown. Illustrate what is the tangential speed of the ball?
Positive pressure is used in blood transfusions. Suppose a container of blood is placed 1m above a vein where the venous pressure is 0.3 kPa
A person of mass 73kg stands at the center of a rotating merry-go-round platform of radius 3.5m and moment of inertia 950kg kg m^2. Calculate the rotational kinetic energy of the system of platform plus person after the person's walk
question1a curve of radius 160 m is banked at an angle of 11deg. an 808-kg car negotiates the curve at 88 kmh without
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