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Two people of equal mass hold hands while ice skating and are spinning around a point midway between them, with no friction with the ice. Initially they are rotating around this midpoint at one revolution every 5 seconds, and their arms are extended so that their centers of mass are 1.5 meters from each other. They then pull themselves toward each other so that the separation of their centers of mass is only 0.5 meters. What is their new rotation rate in revolutions per second?
A 10-kilogram block of southern pine 30 centimeter on a side is held submerged under water. Determine what force is required to do this
A solid sphere ( moment of inertia, I=2/5MR^2) is rolling smoothly with a speed of 6.0m/s pom a horizontal surface. How fast will the sphere be rolling
Consider a concave mirror with a focal length of 15.54 cm. a) Find the image distance when the object distance is 15.54 cm. (Answer with -1000 if the image does not exist.) Answer in units of cm. b) Find the image distance when the object distance..
a fly beats its wings at a frequency of 1200 Hz. if the expansion and contraction of the wing muscles of the fly exhibits simple harmonic motion, what is the time period of a single beat of the flys wings
A rock is tossed straight up with a velocity of 20 m/s When it returns, it falls into a hole 10m deep.What is the rock's velocity as it hits the bottom of the hole
What is the strength of an electric field that will balance the weight of a proton? What is the direction of an electric field that will balance the weight of a proton? What is the strength of an electric field that will balance the weight of an elec..
A particle of mass m0 is given a kinetic energy equal to one-third its rest-mass energy. How fast must the particle be traveling
You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. What is the maximum horizontal range of your gun
Does perfect conductivity require that the interior magnetic field of a body be zero? What does it require of the interior magnetic field?
A 1.8-m-long glass tube that is closed at one end is weighted and lowered to the bottom of a freshwater lake. Determine the depth of the lake
Two converging lenses are placed such that they are three focal lengths apart. What is the linear magnification of the lens system
An object is found to have a weight in air of 500N. It is then tied to a string connected to a balance and immersed in water (density of water is 1000 kg/m3). The scale now reads 450 N. at last the object is immersed in oil and is found to have a ..
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