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A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 845 Newton.
(a) As the elevator moves up, the scale reading increases to 946 Newton. Estimate what the acceleration of the elevator.
(b) As the elevator approaches the 74th floor, the scale reading drops to 782 Newton. Estimate what is the acceleration of the elevator?
A glass sphere has radius R = 6.4 cm and index ofrefraction 1.7. A paperweight is constructed by slicing through thesphere along a plane that is 2.0 cm from the center of the sphere,leaving height h = 4.4 cm.
a box that weighs 10lbs is pushed along a surface by a variable force f0.1t0.5 lbs. what is the velocity in fts of the
What force must be applied to push a carton weighing 310 N up a 16° incline, if the coefficient of kinetic friction is 0.41
A 4.00-microF capacitor that is initially uncharged is connected in series with a 7.90-k ohm resistor and an emf source with E = 120 V and negligible internal resistance. what is the voltage drop across the resistor
A 0.12- kg ball is moving at 6 m/s when it is hit by a bat, causing it to reverse direction and have a speed of 14 m/s. what is the change in the magnitude of the momentum of theball?
at a certain location the earths magnetic field has a magnitude of 5.9 x 10-5 t and points in a direction that is 72
a cube is located with one corner at the origin of an x y z coordinate system. one of the cubes faces lies in the x y
You're 6.0 m from one wall of a house. You want to toss a ball to your friend who is 6.0 m from the opposite wall. What minimum speed will allow the ball to clear the roof
a student using a resonance tube determines the three resonances occus at distances of l1 0.172m l20.529m l30.884m
Sound is considered an electromagnetic wave. The electric field in an electromagnetic wave is parallel to the magnetic field. An accelerating reference frame is considered as an inertial reference frame. In the photoelectric effect, light acts like a..
Two converging lenses are separated by 24.20 cm. The focal length of each lens is 12.40 cm. Determine the final image distance relative to the lens on the right
A golfer hits a tee shot off of a cliff that is 18.2 m high. If it lands in the fairway a horizontal distance of 270 m from the tee and is in the air for 5.3 seconds, What was the initial velocity of the golf ball
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