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A woman stands on a scale in a moving elevator. Her mass is 53.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9860 N. What does the scale read during the acceleration?
N
After flying for 15 min in a wind blowing 42 km/h at an angle of 32° south of east, What is the speed of the airplane relative to the air
A 1500 {rm kg} wrecking ball hangs from a 20 {rm m} long cable. The ball is pulled back until the cable makes the angle of 17.0^circ with vertical.
A person with perfect pitch sits on a bus bench listening to the 450 Hz horn of an approaching car. If the person detects the frequency of 470 Hz, how fast is the car moving.
In one cycle, a heat engine does 310 J of work and releases 620 J of heat to a lower-temperature reservoir. What is the efficiency of the engine
Two adjacent natural frequencies of an organ pipe are found to be 450 Hz and 495 Hz. What is the length of the pipe
A photon has the same momentum as an electron moving with a speed of 1.83×105 m/s. What is the wavelength of the photon
A vehicle attempting to aerbrake into orbit around Mars needs to achieve an equivalent deltaV(retro) of 2 km/s. what is the average drag force (in g's) we must attain
An RL series circuit has R = 72.0? and L = 2.20mH . The series combination is connected across a 155V (rms), 58Hz power supply. Find the impedance of the RL combination
Suppose a 64.0 kg boy and a 48 kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.00 m/s2, find out the magnitude of the acceleration of the boy toward the girl.
An electron is placed in a uniform electric field of strength 210 N/C. If the electron is at rest at the origin of a coordinate system at t = 0 and the electric field is in the positive x-direction
You are 1.7m m tall and stand 3.5m m from a plane mirror that extends vertically upward from the floor. What is the minimum height the mirror must have for you to be able to see the top of the table in the mirror
An aluminum ring needs to be placed over a cylinder steel bar. At 10.00 degrees C, Find the temperature of the ring at which it fits over the bar
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