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Question: A UFO lowers a 278kg stairway of length 5.29 m from under its belly until it is fully extended at an angle of 54 degree. The stairway is free to pivot on hinge and it is supported at its far end by vertical cable.
Question 1: What is the tension in the cable?
Please explain each step and equations used for above question.
A heavy sled is being pulled by two people as shown in the figure. The coefficient of static friction between the sled and the ground is ?s = 0.571, and the kinetic friction coefficient is ?k = 0.467. what is the sled\'s acceleration
A person lies flat on the sidewalk with her ear to the ground. A limb falls and two distinct sounds are heard, one from the air and the other from the concrete. How far away did the impact occur
A 1.00 m 3 container of air absorbs 5857 J of heat at a constant pressure of 1.00 atm. Air has a density of 1.20 kg/m 3, a constant-pressure specific heat of 10*10 J/(kg·°C), and a thermal coefficient of expansion of 3.67 X10-3 (°C)-1. Find the wor..
Atomic Hydrogen in the ground state absorbs a photon, raising the electron to the n=3 excited state. Determine the number of classical revolutions the electron makes during the 0.1 ns time interval
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 32.9 dB. what is the intensity delivered to the eardrum
The magnetic field inside an air filled solenoid 36cm long and 2cm in diameter is 0.8T. Approximately how much energy is stored in this field
A heavy crate is attached to the wall by a light rope. Another rope hangs off the opposite edge of the box. If you slowly increase the force on the free rope by pulling on it in a horizontal direction, which rope will break? Ignore friction and th..
The roof of the student dining hall at your college would be supported by high cross-braced wooden beams attached in the shape of an upside-down L. Each vertical beam is 10.0 ft high and 2.0 ft wide.
A plane flies 450 km east from city A to city B in 45.0 min and then 900 km south from city B to city C in 1.50 h. (Assume points east and points north.) what is the plane's average velocity for the total trip
During the pitching motion, a baseball pitcher exerts an average og 60 N against the0.15kg baseball while moving it through a horizontal displacement of 2.0 m before he releases it
A closed system consists of 4 objects. Initially, object A has 137 J of energy, object B has 158 J of energy, object C has 127 J of energy, How much energy does object D have
An asteroid is moving along a straight line. A force acts alongthe displacement of the asteroid and slows it down. The asteroidhas a mass of 5.0×104 kg, and theforce causes its speed to change from 7800 to 4500m/s.
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