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An elevator has mass 680kg , not including passengers. The elevator is designed to ascend, at constant speed, a vertical distance of 20.0m (five floors) in 16.8s , and it is driven by a motor that can provide up to 41 hp to the elevator. What is the maximum number of passengers that can ride in the elevator? Assume that an average passenger has mass 65.0 kg.
Two blocks are connected by a light string that passes over two frictionless pulleys
A piece of insulated wire is shaped into a figure 8, as shown in Figure P31.18. The radius of the upper circle is 5.00 cm and that of the lower circle is 9.00 cm. What is the magnitude of the induced current in the wire
Starting from rest, a 12-cm-diameter compact disk takes 3.3s to reach its operating angular velocity of 2500rpm. How much torque is applied to the disk
An MP3 player operates with a voltage of 3.7 V, and is using 0.21 W of power. Find the current being supplied by the player's battery
At T = 0ºC and p = 1000mb, 1g of dry air receives during an isochoric process anamount of heat, what is the amount of heat absorbed
A plane flies parallel to the ground at a speed of 1.15 times the speed of sound. What is the altitude of the plane
On a banked race track, the smallest circular path on which cars can move has a radius of 106 m, compute the largest speed at which cars can move on this track without relying on friction
A 4kg parcel of dry air initially at p=950mb and T=295K compresses isobarically to one third of its original volume, Calculate the final temperature and the work done
A man weighing 720 N lies on a bed of nails. Calculate the pressure exerted on the skin by an acupuncture needle of radius 0.100 mm applied with a force of 5.20 N
A man stands on the roof of a building of height 13.6m and throws a rock with a velocity of magnitude 31.8m/s at an angle of 31.6 degrees above the horizontal. compute the maximum height above the roof reached by the rock
Water has a density of 1000 kg/m^3. One atmosphere is 1.013 X 10^5 N/m^2. Find the pressure in the upper pipe
What is the angle of total internal reflection (critical angle) for a glass-to-water interface
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