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A police officer investigating an accident determines from the damage done that a moving van hit a stationary van at 28 km/h.
If the moving van left skid marks 49 meters long, and if the coefficient of kinetic friction is 0.69, determine the initial speed of the moving van?
150ml of water at 20.0C is placed in the freezer compartment of a refrigerator with a coefficient of performance of 6.00. How much heat energy is exhausted into the room
a salesman can contact either one or two customers per day with probability 13 and 23 respectively. each contact will
An evacuated spherical diving bell containing a camera is in the ocean at a depth of 161 m. Find the magnitude of the total force on the port
A moving particle encounters an external electric field that decreases its kinetic energy from 9800 eV to 8350 eV as the particle moves from position A to position B. The electric potential at A is -43.0 V, and that at B is +23.0 V. Determine the ..
A proton travels through uniform magnetic and electric fields. The magnetic field is in the negative x direction and has a magnitude of 2.77 mT. what is the magnitude of the net force acting on the proton
A heat engine operating at maximum efficiency has an efficiency of 25%. The temperature of the cold reservoir is 300 K. What is the temperature of the hot reservoir
An ideal gas undergoes isothermal compression from an initial volume of 5.37 m3 to a final volume of 2.27 m3. There is 6.45 mol of the gas, How much work is done by the gas
On a hot summer day (30 degrees Celsius), a pesky little mosquito produced its warning sound near your ear. What is the frequency in Hertz of the sound wave
one block of mass m slides without friction on horizontal table. The block is attached to one end of a massless spring of equilibrium length L0 and spring constant k, Define the effective potential energy Veff. Sketch the U and Veff potential energ..
7400 J of input heat to perform a certain amount of work. Engine 2 has an efficiency of 0.33, How much input heat does the second engine require
A 56 kg student runs at 5.0 m/s, grabs a hanging rope, and swings out over a lake, What is the maximum tension in the rope?
a uniform electric field with magnitude of 6000 nc passes through a rectangle with sides of 3 cm and 6 cm. what is the
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