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The initial velocity of a 4.0-kg box is 11 m/s, due west. Af…

The initial velocity of a 4.0-kg box is 11 m/s, due west. After the box slides 4 m horizontally, its speed is 1.5 m/s. Determine the magnitude and the direction of the non-conservative force acting on the box as it slides.

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Holly puts a box into the trunk of her car. Later, she drive…

Holly puts a box into the trunk of her car. Later, she drives around an unbanked curve that has a radius of 48 m. The speed of the car on the curve is 16 m/s, but the box remains stationary relative to the floor of the trunk. Determine the minimum coefficient of static friction for the box on the floor of the trunk.  

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Water is flowing through a pipeline at the speed of 5 m/s wh…

Water is flowing through a pipeline at the speed of 5 m/s when it encounters a vertical bend in the pipe raising it by 4.0 m. After the rise, the speed of flow reduces to 4 m/s. The cross-sectional area of the pipe does not change. What is the difference in pressure (PB – PA) in the portions of the pipe before and after the rise?  

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A rock weighs 30 N in air and 25 N when completely submerged…

A rock weighs 30 N in air and 25 N when completely submerged in a fluid with a density of 750 kg/m3.   Determine the density of the rock.

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In a well-insulated container, 4.0 kg of water and 3.0 kg of…

In a well-insulated container, 4.0 kg of water and 3.0 kg of ice are in thermal equilibrium at 0 °C. How much heat is required to bring the system to thermal equilibrium at 45 °C?

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What is the pressure difference between the street level and…

What is the pressure difference between the street level and the roof of a 400 m high tower?  (Assume the density of air is 1.29 kg/m3 )

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Water enters a pipe of diameter 5 cm with a velocity of 4 m/…

Water enters a pipe of diameter 5 cm with a velocity of 4 m/s. Then the water encounters a constriction and its velocity becomes 16 m/s. What is the diameter of the constricted portion of the pipe?

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A system containing an ideal gas at a constant pressure of 1…

A system containing an ideal gas at a constant pressure of 1.32 × 105 Pa gains 2120 J of heat.  During the process, the internal energy of the system increases by 2640 J.  What is the change in volume of the gas?

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A circular hole in a copper plate is 3.925 cm in diameter at…

A circular hole in a copper plate is 3.925 cm in diameter at 30.0 °C.  What is the diameter of the hole if the temperature of the plate is raised to 150.0 °C?  The coefficient of linear expansion of copper is 17 × 10–6/C°. 

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Sphere 1 has an emissivity of 0.8, its radius is 1 m, and it…

Sphere 1 has an emissivity of 0.8, its radius is 1 m, and its temperature is 25 °C. Sphere 2 has an emissivity of 0.4, and a radius of 1 m. What should be the temperature of Sphere 2 so it emits radiation at the same power as Sphere 1?   

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