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It has been suggested that rotating cylinders about 8.0 mi long and 5.0 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth?
A highway curve with a radius of 400 m is banked properly for a car traveling 80 km/h. how much sideways force must the tires exert against the road if the car does not skid
Consider a bird that flies at an average speed of 10.7m/s and releases energy from its body fat reserves at an average rate of 3.70W, How far will the bird fly before feeding again
Struck from behind, a 950-kg stopped car accelerates from rest to 40km/h in 75 ms, What horizontal force on the head would accelerate it along with the rest of the body
The 4{rm kg} 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 83N.
A hot ( ) lump of metal has a mass of 250g and a specific heat of 0.25 . John drops the metal into a 500g calorimeter containing 75g of water at . The calorimeter is constructed of a material that has a specific heat of 0.10 . When equilibrium is ..
A golf club striking a golf ball imparts a force of2100N over a time of 5.06×10?3s at an angle of 35.0? above the horizontal. What maximum height does the golf ball achieve after impact
A charged conducting sphere of radius 18 cm has 1012 electrons removed from its surface. What is the surface charge density of the sphere
A couple of astronauts agree to rendezvous in space after hours. Their plan is to let gravity bring them together. Find the his and her initial acceleration
On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. What is the total kinetic energy of the two blocks after the collision (in joules)
During basketball tryouts, Umass walk-on hopeful Dwayne Madison stole a pass at his own free throw line. He then spring straight down the court to the opponent's free throw line, What was his avg velocity
A concave mirror forms a real image which is twice the size of the object. calculate the radius of curvature of the mirror
A bird flies 3.05 km due west and then 3.26 km due north. Another bird flies 1.03 km due west and 1.16 km due north. Determine the angle with respect to the 2nd bird's displacement vector
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