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Two coupled boxcars are rolling along at 3.5 m/s when they collide with and couple to a third, stationary boxcar. A) What is the final speed of the three coupled boxcars? B) What fraction of the cars' initial kinetic energy is transformed into thermal energy?
A cube of ice is taken from the freezer at -5.7%u2218Cand placed in a 95g aluminum calorimeter filled with 305g of water at room temperature of 20.0 %u2218C, What was the mass of the ice cube
A flight attendant pulls her 64 N flight bag a distance of 370 m along a level airport floor at a constant velocity. The force she exerts is 45 N at an angle of 51° above the horizontal.
A step-down transformer is used for recharging the batteries of portable devices. The turns ratio N2/N1 for a particular transformer used in a CD player is 4:57. find the power delivered to the CD player
A copper pipe with an outer radius of 0.015 m runs from an outdoor wall faucet into the interior of a house. Find the inner radius of the pipe
Titanium dioxide (TiO2), with an index of refraction of 2.50, is one compound that is often used as a lens coating. Find the smallest thickness of TiO2 that will meet these requirements
In proton-beam therapy, a high-energy beam of protonsis fired at a tumor. The protons come to rest in the tumor,depositing their kinetic energy and breaking apart thetumor’s DNA, thus killing its cells. For one patient, it isdesired that 0.10 J of pr..
Frank and Mary are twins, and Mary wants to travel to our nearest star system, Alpha Centauri (4.30 lightyears away). How old will Frank be when she returns
a point dipole P is imbedded at the center of asphere of linear dielectric material (with radius R and dielectricer ). find the electric potential inside and outside the sphere
Three separately located capacitors (capacities: C1, C2, C3) with the electric charges: Q1, Q2, Q3 initially are not connected by conductors
Any change of the energy of a system occurs because of
Brian is trying to pull Julie on a sled across a flat snowy field. Brian puls on a rope attached to the sled. how much force must Brian exert on the rope to start moving the sled
A 13 turn circular loop of wire has a diameter of 0.66m. The plane of the circular loop creates an angle of 63 to the Earth's magnetic field. In 0.15s the coil is flipped at a location where the magnitude of the Earth's magnetic field is 34 μT.
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