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An aluminum cup contains 225 g of water and a 40 g copper stirrer, all at 27°C. A 470 g sample of silver at an initial temperature of 89°C is placed in the water. The stirrer is used to stir the mixture gently until it reaches its final equilibrium temperature of 32°C. Calculate the mass of the aluminum cup.
In g
A hot-air balloon is accelerating upward under the influence of two forces, its weight and the buoyant force. What is the acceleration of the rising balloon
The tension in a ligament in the human knee is approximately proportional to the extension of the ligament, What is the tension in this ligament when it is stretched by 0.67 cm
A spaceship moves past you at speed v. You calculate the ship to be 364 m long, whereas an astronaut on the ship measures a length of 420 m. Find v.
A block of weight W can slide on a horizontal surface. A force of W/n1 is applied to the right that causes the block to accelerate with acceleration equal to g/n2. g is the acceleration by reason of gravity. If the coefficient of kinetic friction is ..
Two pipes of the same length are both made to vibrate at their lowest resonant frequency. What is the length of the pipes?
A 8760-kg car is travelling at 27.8 m/s when the driver decides to exit the freeway by going up a ramp. What is the magnitude of the average drag force exerted on the car
An electron of mass 9.1E-31 kg is released from rest at a distance of 7.1 E-10 m from a fixed electron. Find the maximum velocity (in meters/second) of the moving electron after release
In a fast-pitch softball game the pitcher is impressive to watch, Determine the angle of the total acceleration relative to the radial direction
A positive charge of q = 3.5 µC is pulled on by two negative charges. One, -2.0 µC, is 0.050 m to the north and the other, -4.0 µC, is d = 0.029 m to the south. What total force is exerted on the positive charge .
A 5kg block is accelerated at 3 m/s^2 while fighting a frictional force of 25 N. What force needs to be applied to the block
A bird stands on a dc electric transmission line carrying 3200A. What is the potential difference between the bird's feet
What is the electric field at 9.4 cm from the central axis. What is the overall magnification of microscope.
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