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(a) A water hose 4.00 cm in diameter is used to fill a 25.0 L bucket. If it takes 3.00 min to fill the bucket, what is the speed v at which water moves through the hose? (Note: 1 L = 1000 cm3.)
(b) If the hose has a nozzle 2.00 cm in diameter, find the speed of the water at the nozzle.
An unstretched spring with spring constant 21 N/cm is suspended from the ceiling. A 3.3 kg mass is attached to the spring and let fall. To the nearest tenth of the centimeter, how far does it stretch the spring.
A closed box is filled with dry ice at a temperature of -80.4 oC, while the outside temperature is 20.8 oC. Find the thermal conductivity of the material from which the box is made
A wooden block weighing 7 N is at rest on top of a wooden desk. The coefficient of static friction between the block and the desk is 0.41. Find out the minimum horizontal force required to move the block if the following occurs.
A barbell spins around a pivot at its center at A. The barbell consists of two small balls, each with mass 450 grams (0.45 kg), Calculate the moment of inertia I of the barbell
You are standing at a red light on SW 8th Street at 97th Avenue. The light turns green, find the work done on your car by the frictional force
A car moves horizontally with a constant acceleration of 3 m/s2. A ball is suspended by a string from the ceiling of the car; What angle does the string make with the vertical
The density of charge-carrying electrons in copper is 8.5 × 1028 electrons m?3, its resistivity is 1.72 × 10-8 ?·m, and the drift speed is 2.80 × 10-3 m/s. At what rate must thermal energy be carried off by a cooling medium
What is the average value of the orbital angular momentum, L, for the hydrogen atom if the electron is in the 3d orbital? Note that the average value of L can be written as = ^(1/2).
A 450 nm laser is shown through a single slit. A second 450 nm laser is shown through a double slit. Find the location of the third order minimum for both the single and double slit
If a photon is a wave and is moving (along the X-axis) at the speed of light, isn't any specific part of the wave moving faster than the speed of light? A specific point on the wave moves up and down yet is traveling in the X direction at the speed o..
a moto-cross rider is airborn after a jump. Each wheel of his bike has a rotational intertia of .760 kg m2, What will his (bike and all) angular speed be after the wheel stops
A highway curve of radius 560m is designed for traffic moving at a speed of 94.0km/hr. What is the correct banking angle of the road
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