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You are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the Empire State Building. Before the state legislature votes on funding for the project, they would like you to report on the benefits of upgrading the elevators. One of the numbers that they have requested is the time it will take the elevator to go from the ground floor to the 102nd floor observatory. They are unlikely to approve the project unless the new elevators make the trip much faster than the old elevators. If state law mandates that elevators cannot accelerate at greater than 3.30 m/s2 or travel faster than 19.8 m/s, what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor?
question a 25.0-omega bulb is connected across the terminals of a 12.0-v battery having 3.50 omega of internal
A and B, are located at the similar distance from the observation screens. Light with the similar wavelength λ is used for each. The separation between adjacent principal maxima for grating A is 2.7cm, and for grating B it is 3.2 cm.
A tennis player standing 10.7 m from the net hits the ball at 2.50° above the horizontal. how fast was the ball moving when it left the racquet
A beam of light is incident on a glass plate ( = 1.62) in air and the reflected ray is completely polarized. What is the angle of refraction for the beam
A bullet of mass 4.3 g is fired horizontally into a 8.60 kg wooden block at rest on horizontal surface. The coefficient of kinetic friction between block and surface is 0.13.
A 75-kg water skier is being pulled by a horizontal force of520 N an has an acceleration of 2.4 m/s2. what force is needed to pull the skier at a constant velocity
A noisy grinding machine in a factory produces a sound intensity of 1.40 multiply.gif 10-3 W/m2. Calculate the decibel level of this machine
q1. two thin wedding bands each with mass m and radius r are welded together so that each ring passes through the
A 100 g (mass) bouncy ball has a downward velocity of 10 m/s right before hitting the ground. How long was the ball in contact with the ground to the nearest second
A camera has a lens with a focal length of 25.6 cm. how far from the film should the lens be placed
A car starts from rest at a stop sign. It accelerates at 2.0 m/s2 for 5.7 seconds, coasts for 2.3 s , and then slows down at a rate of 1.5m/s2 for the next stop sign. How far apart are the stop signs?
A flexible circular loop of 10 turns lies in the plane of the paper. The radius of the loop is 0.150 m. The magnetic field is 0.250 T directed into the paper. The area of the loop is reduced to zero in 0.125 s. Determine the magnitude of the avera..
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