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A disk-shaped space station 175 m in diameter spins uniformly about an axis perpendicular to the plane of the disk through its center. How many rpm (rev/min) must this disk make so that the acceleration of all points on its rim is g/2?
If the shear stress in steel exceeds about 3.92 × 108 N/m2 , the steel ruptures. Find the shearing force necessary to shear a steel bolt 0.91 cm in diameter
The magnetic field at the center of a 1.0-cm-diameter loop is 4.5 mT, What is the current in the loop, At what distance from the wire is the magnetic field 4.5 mT
An automobile engine takes in 4000 J of heat and performs 1100 J of mechanical work in each cycle. How much heat is "wasted" in each cycle
When a large bone such as the femur is broken, the two pieces are often pulled out of alignment by the complicated combination of tension, how much mass m must be attached to the bottom pulley
398 g of water at 64°C is added to ice at 0°C. If the final temperature of the system (which you can assume is isolated) is 0°C, determine how much ice melted
A merter stick pivoted at its center has a 100gm mass suspended at its 20cm mark. Where should an 80gm mass be placed to produce equilibrium
An atom is ionized so that it has only one electron. When the electron drops from the n = 4 shell to the n = 1 shell, an X-ray of wavelength 155.61 pm is emitted. What is the atomic number
Now the gymnast (not holding any additional mass) walks directly above the right support. What is the force the left support exerts on the beam
Two 100 N forces pull on a 50kg mass. One of the forces pulls to the right and the other pulls 90 degrees from the first force. What is the net acceleration of the mass
The clarinet is well modeled as a cylindrical pipe that is open at one end and closed at the other. Find the wavelength and frequency of the third normal mode of vibration
The position of an object as a function of time is (3.2t + 1.8t^2)i + (1.7t + 2.4t^2) , where is the time in seconds. Find the magnitude and direction of the object.
A hunter on a frozen, essentially frictionless pond uses a rifle that shoots 4.20g bullets at 960m/s. Find the recoil velocity of the hunter if he fires the rifle horizontally
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