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In a bizarre experiment devised by a physics teacher and an industrial arts teacher at a local high school, a cast-iron engine block of mass m_e with coolant of mass is heated to 100 oC (T_e ) in a water bath. The engine block is then quickly submerged in an insulated container holding a mass m_c of 1000kg of water, at a temperature t_w of 15 oC, to find the mass of the coolant in the engine. The final temperature T_f of the water, engine, and coolant is found to be 18 oC after heat from the engine is transferred to the water. The engine coolant used is pure ethylene glycol C2H6O2, which has a specific heat of C_c. (Usually you would use a mix of ethylene glycol and water as coolant.) The mass of the engine block used is 275kg and the specific heat of cast iron c_e is 4.50X10^2. The specific heat of water c_w is 4187 . Assume that this is a closed, isolated system. For this experiment, the students were asked to find the mass of the coolant. If pure ethylene glycol is used as the coolant, what is the mass of coolant m_c used in the experiment? Find the mass of ethylene glycol m_c in kilograms to three significant digits.
The measured conductivity of Cu at Room Temperature is 5.88 x 107/ohm.m and the Fermi energy for Cu is 7.03 eV, Find the mean free path( mfp) of electrons in copper
A point charge causes an electric flux of -670 N·m2/C to pass through a spherical Gaussian surface of 18.0 cm radius centered on the charge. What is the value of the point charge
In a Compton collision, if the wavelength of the photon is 1.00 pm and its deflected angle is 60.0°
A 0.14 meter string clamped at both ends under a tension of 16 N has a fundamental frequency of 135 Hz. What is the mass density of the string
A small metallic bob is suspended from the ceiling by a thread of negligible mass. The ball is after that set in motion in a horizontal circle so that thread describes a cone. Compute the magnitude of the angular momentum of the bob about a vertic..
At a recent rock concert, a dB meter registered 114 dB when placed 1.30 m in front of a loudspeaker on the stage, What was the power output of the speaker
The horizontal surface is frictionless and the system is free from rest. Using energy concepts, determine the speed of m3 after it moves down a distance of 6.0 m.
An electron is released from rest in a uniform electric field and accelerates to the north at a rate of 199m/s2. What is the magnitude of the electric field?
A 6 m board of mass 5 kg is hinged at one end, with a 60 kg block nesting on the board 202 cm from the hinge. Find the force exerted by the hinge at this angle
An energy of 28.0 eV is required to ionize a molecule of the gas inside a Geiger tube, What maximum number of ion pairs can it create
A person who weighs 680 N is riding a 98-N mountain bike. Suppose the entire weight of the rider and bike is supported equally by the two tires. If the gauge pressure in each tire is 6.45 105 Pa, what is the area of contact between each tire and the ..
At launch the space shuttle has an overall upward acceleration of about 5m/s^2, how far inot the air will it travel, assumin that it travels straight up, what is the velocity of the shuttle after 5 seconds
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