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Cart A, with a mass of 2 kg, travels on a horizontal air-track at 3 m/s and hits cart B, which has a mass of 4 kg and is initially at rest. You are not told if the collision is elastic or inelastic. After the collision, what is the speed of the center of mass of the two-cart system?
A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 46 dB by an observer 10 km away. What is the average power generated by the horn
A non-uniform bar 5 meters has a center of gravity 1 meters from the heavy end. If it is placed on the edge of a block 1 meters from the light end and a weight of 1497N is placed at the light end of the bar, it will be balanced. What is the weight..
On one of the shelves in your physics lab is displayed an antique telescope. A sign underneath the instrument says that the telescope has a magnification of 20, what is the focal length fe of the eyepiece
A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, the boat sinks an additional 3.50 cm into the river. What is the weight of the truck
An electric utility company supplies a customer's house from the main power lines (115V) with two copper wires, Calculate the power lost in the copper wires
A 50.0-g sample of a conducting material is all that is available. The resistivity of the material is measured to be 11× 10 -8 ?m, What must be the diameter of the wire
An unspecified force causes a 0.2-kg object to accelerate at 0.4 m/s2. find the acceleration (in m/s2) of the heavier object
A car uniformly decelerates at a rate of -5.00 m/s^2. How far does the car travel after 1.5 seconds if it initially was moving at a speed of 25 m/s
Earth's radius is 6.38 × 106 m, and it completes one revolution every day. What is the tangential speed of a person standing on the equator
Two skaters, a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. Determine the acceleration (magnitude and direction) of the man
The velocity vs. time curve of an object is an increasing straight line. What is the acceleration of the object
The rear window of a car consists of thirteen thin wires (resistivity = 88.0 * 10^-8 ohms) embedded in the glass. Find the cross-sectional area of each wire
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