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On a cold winter's day, heat leaks slowly out of a house at a rate of 20.0kW. If the inside temperature is 22C and the outside temperature is -14.5C, find the rate of entropy increase.
A helium-neon laser (wavelength = 630 nm) is used in a single-slit experiment with a screen 7.5 m away from the slit. what is the width of the central bright fringe on the screen
The atomic bomb that was dropped on Nagasaki in 1945 killed 140,000 people, How much mass was converted to energy when this took place
A forces of 16.88 N is applied tangentially to a wheel of radius 0.340 m and gives rise to an angular acceleration of 1.20 rad/s^2
Two people carry a heavy electric motor by placing it on a light board 1.55 m long. One person lifts at one end with a force of 390 N, What is the weight of the motor
Two forces, F1 vector and F2 vector, act at a point. F1 vector has a magnitude of 8.40N and is directed at an angle of 65.0 degrees above the negative x axis in the second quadrant. What is the magnitude of the resultant force
On an old-fashioned rotating piano stool, a woman sits holding a pair of dumbbells at a distance of 0.595m from the axis of rotation of the stool. She is given an angular velocity of 3.05rad/s , after which she pulls the dumbbells in until they ar..
A small block of mass m slides along a frictionless loop-the-loop track. If it starts from rest at point P. What is the resultant force at point Q
Neutron stars consist only of neutrons and have unbelievably high densities. Calculate the density of such a star
suppose a sample of 1 mole of a diatomic ideal gas at 1 atm and 20 degrees C is ADIABATICALLY expanded to 5 times its original volume. how much work did the gas do on the environment
An aluminum ball does not fit through a brass ring at 20oC. The diameter of the ball is 2.001 cm, At what temperature does the ball just fit through the ring
A dump truck designed to carry grain is shown. The dump bed is actuated by a hydraulic cylinder AB. If the combined weight of the dump bed plus its load is 800 lb, and the bed is at the position shown, determine the forces acting on the bed at B and ..
A thick-walled hollow cylinder (inner radius=47 cm, outer radius=66 cm) rolls down a 7° incline. If it starts with a speed of 1.9-m/s, what is its speed after it has travelled 16 m? (m/s).
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