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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.
an airtight box has a removable lid of area 1.34e-2 m2 and negligible weight. the box is taken up a mountain where the
A solid sphere rolls without slipping or sliding along a horizontal surface toward an incline. Calculate the kinetic energy of sphere as it rolls along the horizontal surface
A 6.250 keV x-ray photon strikes a carbon atom and is scattered with a Compton scattering with one of the carbon’s electrons. The energy of the scattered photon is measured to be 6.175 keV. What is the wavelength of the scattered photon? During what ..
A cable used to lift heavy materials like steel I-beams must be strong enough to resist breaking even under a load of 2.2 x 106 Newton. Evaluate what cross-sectional area should the cable have if it's to be made of steel
question a golf ball is hit and leaves the ground at 35 ms. if its speed is 23 ms at the peak of its path what is the
AnRL circuit has an emf source of 13V, a resistor, a 20 H inductor,and a switch. If the emf across the inductor is 80% of its maximum13V 3 s after the switch is closed, what is the value of the resistor
Object O1 is 15.2 cm to the left of a converging lens with a 11.8-cm focal length. What is the nature (i.e., real or virtual, upright or inverted) of the final image
A biology student utilizes a simple magnifier to examine the structural features of the wing of an insect. The wing is held 3.75 cm in front of the lens, and the image is formed 26.0 cm from the eye. What is the focal length of the lens?
In a single slit diffraction pattern the intensity of the maxima
Suppose that a NASCAR race car is moving tothe right with a constant velocity of +97 m/s. What is the averageacceleration of the car? Twelve seconds later,the car is halfway around the track and traveling in the oppositedirection with the same speed...
a 69 g ice cube can slide without friction up and down a 35 degree slope. the ice cube is pressed against a spring at
According to Coulomb's law, how much does the force among two charged points increase or decrease if the distance among them increases two times?
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