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An elevator has mass 740 kg, notincluding passengers. The elevator is designed to ascend, atconstant speed, a vertical distance of 20.0 m (five floors)in 15.0 s and it is driven by amotor that can provide up to 40 hp to the elevator. What is the maximum number of passengers that can ride in the elevator? Assume that an averagepassenger has a mass of 62.0 kg.
A 5.17-g bullet is moving horizontally with a velocity of +340 m/s, where the sign + indicates that it is moving to the right, What is the velocity of the second block after the bullet imbeds itself
You find an unlabeled box of fine needles, and want to determine how thick they are. What is the diameter of the needle
A 2.3 106-kg spaceship moves away from Earth with a speed of 0.37c. find the magnitude of the ship's classical momentum
A commuter train blows its horn as it passes a passenger platformat a constant speed of 30.0 m/s. The trainhorn sounds at a frequency of 330 Hz whenthe train is at rest. What wavelength does the observer find in each case?
A rectagular boat is overloaded so that the water level (in fresh wateer) is just one centimeter (1.0cm) below the top of the boat, what is combined mass of all the people and the boat combined
Calculate the force required to move an object.
A tuning fork vibrates at concert A, fA = 440. Hz. The A string of a violin is sounded together with this tuning fork, Find the period of the string's vibration
You are called as an expert witness in the trial of a traffic violation. The facts are these: A driver slammed on his brakes and came to a stop with constant acceleration, How fast was he going when he hit his brakes
An electron moves to the right with a speed of 0.91c relative to the laboratory frame. Find the speed of the proton relative to the laboratory frame
A softball, of mass m = 0.183 kg, is pitched at a speed v0 = 26.9 m/s. Due to air resistance, by the time it reaches home plate it has slowed by 11.9%. Calculate the average force of air resistance
What is the total energy of a 15-kg mass attached to a spring oscillating horizontally with an amplitude of 20 cm and an angular frequency of 32 rad/s
A piano wire with mass 2.65g and length 79.0cm is stretched with a tension of 34.0N. Calculate the average power carried by the wave
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