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While hauling a log in the back of a flatbed truck, you are pulled over by the state police. Although the log can\'t roll sideways, the police claim that the log could have slid out the back of the truck when accelerating from rest. You claim that the truck couldn\'t possibly accelerate at the level needed to achieve such an effect. Regardless, the police write a ticket anyway and now your day in court is approaching.
The log has a mass of m = 844 kg; the truck has a mass of M = 9750 kg. According to the truck manufacturer, the truck can accelerate from 0 to 55 mph in 26.0 seconds, but this does not account for the additional mass of the log. Calculate the minimum coefficient of static friction ?s needed to keep the log in the back of the truck.
In a common but dangerous prank, a chair is pulled away as a person is moving downward to sit on it, causing the victim to land hard on the floor.
The loaded cab of an elevator has a mass of 3000kg and moves 216-m up the shaft in 23s at constant speed. At what average rate does the force from the cable do work on cab.
A car moving at 37 m/s approaches a stationary whistle that emits 270 Hz sound. The speed of sound is 347 m/s. What is the frequency of sound heard by the driver of the car.
Find the first and second derivative with respect to x of f(x) = (exp(x/a)-exp(-x/a))/2, where exp(x)=e^x is the exponential function.
A cart of mass M = 1.6 kg can roll without friction on the level track. A light string draped over a light, frictionless pulley connects the cart to a hanger with mass m = 0.7 kg.
A physics lab demonstrates the principles of simple harmonic motion (SHM) by using a spring affixed to a horizontal support, calculate the spring constant
A projectile is launched straight up at 59 m/s from a height of 73 m, at the edge of a sheer cliff. The projectile falls, just missing the cliff and hitting the ground below.
Three deer, A, B, and C, are grazing in a field. Deer B is located 64.4 m from deer A at an angle of 53.8 ° north of west. Deer C is located 76.2 ° north of east relative to deer A. The distance between deer B and C is 96.8 m. What is the distance be..
Points A and B have electric potentials of 243 V and 129 V, respectively. When an electron released from rest at point A arrives at point C its kinetic energy is KA. When the electron is released from rest at point B, however, its kinetic energy when..
A rock is thrown vertically up at 6.7 m/s. (a) What is it's height when its velocity is 1.35 m/s? (b) Has the rock made it to the highest point in the path?
How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on? Explain how many revolutions would the wheel have made during this time?
An oil film with n = 1.45 floats on water. It is illuminated by white light from the sun at noon. If the film is 280 nm thick, find the wavelength and color of visible light that is most strongly reflected upward to an observer positioned above th..
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