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Q. It has been suggested that rotating cylinders about 12 mi long and 5.1 mi in diameter be placed in space and used as colonies. What angular speed should such a cylinder have so that the centripetal acceleration at its surface equals free-fall acceleration on Earth?
A 9 m, 220 N uniform ladders rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50° angle with ground. How far up the ladder can an 850 N person climb before ladder beg..
What is the time of oscillation of block
An alpha particle and beta^ {-} particle, each with kinetic energy 35 {rm keV}, are sent through a 1.10 {rm T} magnetic field. The particles move perpendicular to the field. Find the curvature radius for alpha particle's trajectory. Hint: The kine..
For the Atwood's machine, suppose the masses have an initial speed of v = 0.22 m/s and that m2 is moving upward. How high does m2 rise above its initial position before momentarily coming to rest, given that m1 = 3.5 kg and m2 = 3.1 kg.
What is vertical component of the acceleration
A horizontal force of 822 N is needed to drag a crate across a horizontal floor with the constant speed. You drag the crate using a rope held at an angle of 34° (from the horizontal).
A certain freely falling object requires 1.7s to travel the last 37m before it hits the ground. From what height above ground did it fall.
An engineer is designing a pacemaker for cardiac patients. For the 20 year old woman, how many times must device have to beat for her to have a normal life expectancy.
The 4 block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended and the tension in the upper string is 77.
find the mass defect (in u) for (a) helium-3 (2He3), which has an atomic mass of 3.016 030 u, and (b) the isotope of hydrogen known as tritium (1T3), which has an atomic mass of 3.016 050 u.
A hunter aims directly at the target (on the same level) 115 m away. If the bullet leaves the gun at a speed of 205 m/s, by how much will it miss target.
Find the maximum altitude reached by the rocket.
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