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A boy stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.69 of the boy's regular weight. Compute the acceleration of the elevator, and determine the direction of acceleration.
a string of linear density 1.60gm is stretched between clamps 48.0cm apart. the string does not stretch appreciably as
A projectile is fired with an initial speed of 69.0m/s at an angle of 42.8 degrees above the horizontal on a long flat firing range
A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is usedin medical laboratories, for instance, to cause the more dense redblood cells to settle through the less dense bloo..
A hydraulic jack has an input piston of area 0.050 m^2 and an out put piston of area 0.70m^2. How much force on the input piston is required to a lift a car weighing 1.2 * 10^3 N
A pinhole camera takes a picture of a building 200 m tall. If the height of the image on the back of the camera is 5 cm tall, how far is the camera from the building
A 41-kg box is thrown at a speed of 220 m/s & is brought to a halt in a collision that lasts for a time of 6.5 m/s. Find the magnitude of the average net force that acts on the box during the collision.
A proton and an electron are moving due east in a constant electric field that also points due east. The electric field has a magnitudeof 1.0 x104 N/C. Determine the magnitude of theacceleration of the proton and the electron.
An ideal gas at 24.6°C and a pressure 1.60 105 Pa is in a container having a volume of 1.00 L. Determine the number of moles of gas in the container
a parallel plate capacitor has an air dielectric. the capacitor is charged with surface charge density s0 and then the
the car drives straight off the edge of a cliff that is 57 m high. the investigator at the scene of the accident notes
A block with mass m1 = 8.8 kg is on an incline with an angle ? = 39.0° with respect to the horizontal. What is the minimum spring constant of the spring to keep the block from sliding
In exercise physiology studies, it is sometimes important to determine the location of a person's center of mass. How far from the woman's feet is her center of mass
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