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When an electric heater is turned on, the Nichrome heating element is at 0° C and draws a current of 17 A, with a potential difference of 120 V between the ends of the element. The element heats up to 785° C, with the potential difference constant. Find the final current. (The temperature coefficient of resistivity of Nichrome is 4.0 10-4 (°C)-1.)
A student has a stretched string on density u and length L under a tesnion F. A standing wave of frequency f = 4/4 squareroot, Calculate the length of the string
A 920 kg sports car collides into the rear end of a 2300 kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.6 m before stopping. The police officer, knowing that the coefficient of kinetic frict..
A sinusoidal wave is traveling on a string with speed 5.0 cm/s. The displacement of the particles of the string at x = 30 cm is found to vary with time according to the equation y = (5.0 cm) sin[12.0 - (2.0 s-1)t]. what is the frequency of the wav..
An electron is at the origin. (a) Calculate the electric potential VA at point A, x = 0.310 cm. V (b) Calculate the electric potential VB at point B, x = 0.770 cm. V What is the potential difference VB - VA
A 2700 ml- flask is initially open to air at 19 degrees C and 1 atm pressure. It's then closed and immersed in boiling water. How many moles escape when the air is released
An 8.0cm diameter, well-insulated vertical cylinder containing nitrogen gas is sealed at the top by a 5.8kg frictionless piston, What is the gas pressure inside the cylinder
A stone has a mass of 4.00 x10-3 kg and is wedged into the tread of an automobile tire, as the drawing shows. The coefficient of static friction between the stone and each side of the tread channel is 0.76.
he 5.0- block is pulled to the right with a force as shown in the figure . The coefficient of static friction between all surfaces is 0.55 and the kinetic coefficient is 0.3, illustrate what is the minimum value of needed to move the two blocks?
Find an angular velocity of the tire at the marker. Find also the linear speed of the point of contact of the tire with the pavement at the marker.
A space station, in the form of a wheel 100m in diameter, rotates to supply an "artificial gravity" of 3.7m/s2 for persons who walk around on inner wall of the outer rim. Find out the rate of rotation of the wheel (in revolutions per minute) that ..
Two metal balls are hung from strings. The first ball, 0.14 kg, is pulled to the side and released so that it strikes the second ball with a speed of 1.98 m/s. What is the mass of the second ball
A copper beaker of mass 0.20 kg contains 0.10 kg of water at 20.0 celsius. What is the heat gain of the copper
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