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A 25.8 g block of copper whose temperature is 406 K is placed in an insulating box with a 53.4 g block of lead whose temperature is 213 K.
(a) What is the equilibrium temperature of the two-block system, in kelvins?
(b) What is the change in the internal energy of the two-block system between the initial state and the equilibrium state?
(c) What is the change in the entropy of the two-block system? The heat capacities of copper and lead are 386 J/kg·K and 128 J/kg·K, respectively.
A heat engine runs in the cycle A to B to C and back to A. The pressure at C is 200 kPa. The volume at C is 20 liters.
One solenoid is centered inside another. The outer one has a length of 51.0 cm and contains 6800 coils, What is the mutual inductance of these solenoids
A 4.0 kg mass is hung from a string which is wrapped around a cylindrical pulley (a cylindrical shell), what is the mass of the pulley
A mass m1 = 1 kg rests on top of a mass m2 = 5 kg which is attached to a spring (k = 50 N/m), Determine the maximum amplitude of the motion such that the top mass does not slip
A manchine part has the shape of a uniform sphere of mass 225g and diametere 3.00cm. It is spinning about a frictionless axle through its center, how long will the part spin until it stops
A race car is moving with a velocity of 144 kilometers/hour. The driver applies the brakes, and the car comes to a halt in 12.0 seconds. What is the acceleration of the car after 12.0 seconds? A. -12 m/s^2 B. -3.3 m/s^2 C. 3.3 m/s^2 D. 10.3 m/s^2
What is the mass of nitrogen in an nitrogen tank at 20C if the tank has a volume of 0,20m^3 and nitrogen pressure in the tank is 4,0 x 10^6 N/m^2
A fighter pilot dives his plane toward the ground at400 m/s. He pulls out of the dive on a vertical circle. What is the minimum radius of the circle
A squirrel has x- and y-coordinates ( 1.4m , 3.3m ) at time t1=0 and coordinates ( 4.8m , -0.40m ) at time t2 = 2.7s, Find the magnitude of the average velocity
A bird sits on a high-voltage power line with its feet 4.6 cm apart. What is the potential difference between the bird's feet
The same activity is measured for two different isotope samples. One sample contains 0.0450 kg of (atomic mass = 230.033 937 u, t1/2 = 20.8 days). What is the mass of the second sample
You throw a ball with mass 0.40 kg against a brick wall. It hits the wall moving horizontally to the left at 30. m/s, find the average horizontal force the wall exerts on the ball during the impact
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