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A No. 204 radial-contact ball bearing carries a combined load of 200 lb radially and 150 lb axially at 1200 rpm. The bearing is subjected to steady loading. Find the bearing life in hours for 90% reliability.
A loudspeaker of mass 24.0 {rm kg} is suspended a distance of h = 1.40 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.70 {rm m}.
A 20-kg loudspeaker is suspended 2.0 m below the ceiling by two ropes that are each 30 degrees from vertical. What is the tension in the ropes
What is the magnification of an astronomical telescope whose objective lens has a focal length of 77 cm, What is the overall length of the telescope when adjusted for a relaxed eye
A potential difference of 1.50 V will be applied to a 40.0 m length of 18-gauge copper wire (diameter 0.04 in.), find the rate at which thermal energy will appear in the wire
a meter stick is shot horizontally, from a meter stick projector at a speed of .9c. How large will it be relative to its frame of reference
A person is riding a bicycle, and its wheels have an angular velocity of 18.4 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop, How much time does it take for the bike to come to rest
Find out the electric field at radius
Current of 20 Amp is carried by a copper wire. A 0.5 meter straight section of this wire passes through a region of a uniform magnitude field 1.6 tesla strong. find the magnitude of the magnetic force exerted on the wire
An MRI patient is placed in a magnetic field of 0.40T. The resistance of the body is 3200 ohms and the area on the body of the person in the field is 1.02m^2. The Dr. performing the diagnoses just for fun increases the magnetic field intensity to ..
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 7.70 m/s at an angle of 21.0° below the horizontal. Find the height from which the ball was thrown
A sperical mirror is polished on both sides. When the convex side is used as a mirror, the magnification is +1/8. What is the magnification when the concave side is used as a mirror, the object remaining the same distance from the mirror?
The average depth of oceans is about 4km, the oceans cover abou 70% of earths suface. Make an order of nagnitude estimate of the waters volune in he ocean.
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