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a sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27cm and a frequency of 2.55Hz. What is the maximum speed of the needle and what is the maximum acceleration of the needle?
Two starships, the Enterprise and the Constitution, are approaching each other head-on from a great distance. what wavelength was emitted by the Enterprise
Initially at rest, a small copper sphere with a mass of 2.10-6kg and a charge of6.10-4C is accelerated through a7700-V potential difference before entering a magnetic field of magnitude 4 T, directed perpendicular to its velocity. What is the radi..
A helicopter lifts a 72 kg astronaut 19 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/12. How much work is done on the astronaut
A child is pushing a merry-go-round. The angle through which the merry-go-round has turned varies with time according to ?(t)=?t+?t3, What is the initial value of the angular velocity
q1. a student holding two weights close to his chest is sitting on a frictionless chair the student and chair are
If you connect these 3 resistors in series across a variable emf source of negligible internal resistance, what is the largest potential difference this emf source can be set to without damaging any of resistors.
One hundred k mol of a gas containing 94.4 mole% methane, 3.40% ethane, 0.60% propane, and 0.50 percent butane is to be burned with 17% excess air. Calculate the required molar flow rate of the air.
q1. a skier moving at 4.50 ms encounters a long rough horizontal patch of snow having coefficient of kinetic friction
An object travels in a circle of radius 2.0 m. At time t = 0, the object has a velocity of 10 m/s and it slows uniformly to a stop in 30s. a. Draw a circle and indicate the velocity vector and the acceleration vector at some time between 0 and 30s.
Water at a pressure of 13 atm, at street level, flows into a building at 3m/s through a 6 cm diameter pipe. The pipe tapers down to a 2 cm diameter by the top floor 50 m above. The density of water is 1,000 kg/m^3. Calculate the water pressure and ve..
What is the work completed by the block and tackle system?
Initially stationary (the train starts at rest), a train has a constant acceleration of 0.6 m/s2, What is its speed after 21 s
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