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A steel piano string is 49.6 inches long. The diameter of the string 0.0421 inches. When struck, this string produces the musical note, B, which has the pitch of 123 Hz. (a) Find the tension of this string. Give the answer in pounds. The density of steel is 7.86 g/cm^3. (b) There are 228 strings in a piano. (Some notes use more than one string.) If we assume that the tension in every string is the same, find the total fouce (in tons, 1 ton=2000 lb) exerted on the frame of the piano. (Add together the tensions of all the strings.) Piano frames are made of steel so that they can withstand this kind of force.
a straight wire in a magnetic field experiences a force of 0.034 n when the current in the wire is 2.5 a. the current
Science is about collecting data. What kind of data do you think you will collect in Physics 320 class? What kind of data will you collect about heat
which of the following represents work: A compressed spring that is allowed to expand. The normal force on a stationary crate. The frictional force on a crate that is being pushed across a flat floor.
A mass of 500 g is resting on a vertical spring with a force constant of 55 N/m. What is the amplitude of the resulting oscillations
A student is reading material written on a blackboard. Her contact lenses have a refractive power of 57.50 diopters; the lens-to-retina distance is 1.750 cm. How far (in meters) is the blackboard from her eyes
If Argentinosaurus, a long-necked, gigantic sauropod, had a head height of 19 m and a heart height of 9.1 m, What was the blood pressure (in torr or mm Hg) at the feet
A disk shaped grindstone of mass 3.0 kg and radius 8 cm is spinning at 600 rpm. After the power is shut off the frictional torque brings the grindstone to rest in 10 s. ? What is the number of complete revolutions of the grindstone after the power is..
A 563 kg car moving at 19.7 m/s hits from behind another car moving at 14.6 m/s in the same direction. what is the velocity of the first car after the collision
An automobile weighing 2000lbs travels due west at a constand speed of 70 mph. The magnetic field in the area is a constant 2.5 µT due north. What is the normal force on the car
A simple model of a rubber band is a one-dimensional horizontal chain consisting of N linked segments ??Each segment can be in one of two possible states: horizontal, with length a, or vertical, with length 0. The rubber band is in thermal equilibriu..
A golf gall is dropped from a height of h1 = 3.45 m. After it bounces it only reaches h2 = 2.23 m. How much energy did the ball transfer to the environment during the bounce in Joules
a 120 g ball attached to a spring with spring constant 2.9 nm oscillates horizontally on a frictionless table. its
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