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A car traveling 90 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.81 m. What was the average acceleration of the driver during the collision?
A bullet of mass 0.025kg moves at 100m/s initially. It hits a 2kg block of soft pine and emerges from the block at 30m/s. How fast is the block of wood moving after the bullet emerged?
you have a great summer job in a research laboratory with a group investigating the possibility of producing power from
At a point where an irrigation canal having a rectangular cross section is 18.3m wide and 3.70m deep, the water flows at 2.25cm/s. How deep is the canal at this point
A 53.26 g sample of a substance is initially at 29.9 °C. After absorbing 2429 J of heat, what is the specific heat of the substance
In one such test, 150 turns of wire were wrapped around a 7.0-m-diameter cylindrical shark tank. find the magnetic field strength in the center of the tank
a light with wavelength 411nm is shined on 15cm of water with 850nm of oil on top of it. the oil has an index of
A point charge +2.40 is held stationary at the origin. A second point charge -4.30 moves from the point = 0.175 , = 0 , How Much work is done by the electric force on q2
To balance a very light rod when a down force is applied at a point 0.77m to the left of a supporting fulcrum (pivot point), What is the magnitude of the downward force
A 265.0 kg block of ice at 0o C is placed in a large lake. The temperature of the lake is just slightly higher than 0o C, and the ice melts. What is the entropy change of the lake
When jumping straight down, you can be seriously injured if you land stiff-legged. In a stiff-legged landing he comes to a halt in 2.5 ms. Find the average net force that acts on him during this time
There are four coils of wire being used as electromagnets. They all have the equal size and are made up of the same material but have a different number of loops.
A flat, round iron ring 7.00cm in diameter has a current running through it that produces a magnetic field of 77.2?T at its center. find the maximum torque the external field can exert on the ring
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