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You are designing an elevator for a hospital. The force exerted on a passenger by the floor of the elevator is not to exceed 1.51 times the passenger's weight. The elevator accelerates upward with constant acceleration for a distance of 2.9 m and then starts to slow down.
What is the maximum speed of the elevator?
An ore sample weighs 17.5N in air. When the sample is suspended by a light cord and totally immersed in water, the tension in the cord is 11.2N. Find the total volume of the sample
Suppose you are at the earth's equator and observe a satellite passing directly overhead and moving from west to east in the sky. How far above the earth's surface is the satellite's orbit
A solid, uniform disk of radius 0.250 m and mass 62.3 kg rolls down a ramp of length 4.70 m that makes an angle of 18° with the horizontal. Find the angular speed of the disk at the bottom of the ramp
Most of the blackholes observed by astronomers have masses equal to few solar masses (the result of the death of a high mass star) or have masses equal to several million solar masses. Calculate the Schwarzschild radius of a blackhole
Calculate the resistance of a piece of nichrome wire 2.00 m long. the cross-sectional area of the 20 gauge wire is 0.5176 mm2
If the period of a 10-m long pendulum is 18 s on an asteroid, then what is the acceleration due to gravity on the asteroid
The index of refraction for red light in water is 1.331 and that for blue light is 1.340. what are the underwater angles of refraction for the blue and red components of the light
Typical field strengths are a few femoteslas (1fT=10^-15T). An adult brain is about 140mm wide, A reasonable magnetic field is 4.35fT at the sensor. According to this model, what is the current in the brain?
A 640-g hollow ball 21cm in diameter is suspended by a wire and is undergoing torsional oscillations at a frequency of 0.78 Hz
An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is = 1.42 × 109 W/m2. find the magnetic field in the electromagnetic wave emitted by the lase
A 58.6g mass connected to a spring with a force constant of 31.2 N/m oscillates on a horizontal, frictionless surface with an amplitude of 3.70 cm. Calculate the total energy of the system
Suppose a 34.9-kg child sits 1.08 m to the left of center on the see saw with L = 4.30 mA second child sits at the end on the opposite side, Find the mass of the second child
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