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The sled shown in Fig. P1.77 slides along on a thin horizontal layer of water between the ice and the runners. The horizontal force that the water puts on the runners is equal to 1.2 lb when the sled's speed is 50 ft/s. The total area of both runners in contact with the water is 0.08ft/s, and the viscosity of the water is 3.5 × 10-5 Determine the thickness of the water layer under the runners. Assume a linear velocity distribution in the water layer.
A fish swimming in a horizontal plane has velocity (4.00i + 1.00j) m/s at a point in the ocean where the position relative to a certain rock is r (initial)=(10.0i - 4.00j)m. After the fish swims for 20.0 s, its velocity is v=(20.0i - 5.00j) m/s.
A football is thrown at an angle of 38 above the horizontal. Assume the ball is throw and received at the same height. what must be the initial speed of the ball
A ball rolls horizontally with a speed of 8.1m/s off the edge of a tall platform.If the ball lands 6.1m from the point on the ground directly below the edge of the platform
An apple is held off the ground by the surface of a table: The weak interaction. The normal interaction. The strong interaction.
A cylinder of length l, radius r, and mass m is constrained to rotate with constant angular velocity ? about an axis passing through the center O of the cylinder and making an angle a with the long axis of the cyclinder.
A large container, open at the top, is half-filled with water (?H2O = 1000 kg/m3). Determine the fractions of the cube immersed in water and oil
The sun transfers energy to the earth by radiation at a rate of approximately 1.00kW per square meter of surface. what would be the length of its sides in kilometers and in miles
A 60.0-kg runner expends 300 W of power while running a marathon. determine the volume of bodily fluid (assume it is water) lost per hour
A student doing an experiment pours 0.160kg of heated copper shot into a 0.355-kg aluminum calorimeter cup containing 0.240kg of water. What was the initial temperature of the shot
A 10 volt AC voltage source is connected to a transformer with 2 primary coils and 4 secondary coils. The output of the first transformer is connected to the input of another transformer with 8 primary coils and 16 secondary coils as shown below. ..
Two identical, small insulating balls are suspended by separate 0.31m threads that are attached to a commone point on the ceiling. estimate the Charge on each ball
A projectile is fired straight upward from the Earth's surface at the South Pole with an initial speed equal to one third the escape speed. What is the altitude of the projectile at this instant
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