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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 prepare a 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 2.70 m/s2 or travel faster than 15.3 m/s, what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor?
A lens with a refrective index of 1.5 is coated with a material of refractive index of 1.2 in order to minimize the reflection. what is the thinnest possible coating
A mass spectrometer is a device which consists of a velocity selector, with crossed electric and magnetic fields E = 950 V/m, B = 0.93 T. Calculate the radius for a singly ionized charged particle with a mass m = 2.18 × 10-26 kg
A river flows due east at 1.51 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.8 m/s due north relative to the water. (a) What is the velocity of the boat as viewed by an observer on the ..
In November 2004, the United States tested a scramjet that flew at 10.0times the speed of sound for 11.0s , as measured by engineers on earth. How long did the flight last as measured inside the jet
Kim has a metal casting company which makes commemorative coins. what is the diameter in centimeters of each coin
However, as the drawing shows, a plane mirror reflects light from the bird into your camera. If x = 4.2 m and y = 3.9 m in the drawing, for what distance must you set focus of the camera lens in order to snap a sharp picture of the bird's image.
An electron ( charge = -1.6 e^-19 C ) is moving at 3.0 e + 5 m/s in the positive X direction. A magnetic field of 0.8 T is in the positive Z direction. Find the magnetic force on the electron
A device used in radiation therapy for cancer contains 0.29 g of cobalt-60 (59.933 819 u). Determine the activity (in Bq) of the radioactive material
An RC series circuit has R = 1.35 kOhm, L = 225 mH, and C = 2.50 microFarads and is connected across a 200 V (rms), find the impedance of the RC combination
In a playground, there is a small merry-go-round of radius1.20 m and mass 120 kg. Calculate the rotational inertia of themerry-go-round about its axis of rotation
a spacecraft moves past a student with a relative velocity of .90 c. how much time has elapsed according to the student's watch
a body that has a mass of 1 kg and is moving 2 m/sec has an inelastic collision with a body that has a mass of 100 kg and is moving 0 m/sec. what is the their final velocity
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