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tennis ball A is dropped from a height of 15 m. Tennis ball B is thrown horizontally from a height of 15 m with a horizontal velocity of 25 m/s. which tennis ball hits the ground first?
Two masses are connected by a cord passing over a pulley of radius R and moment of inertia I. Mass A slides on a frictionless surface, Derive a formula for the acceleration of the masses
A structural I beam is made of iron. A view of its cross-section and its dimensions is shown in the figure, where d = 2 cm, w = 29 cm, h = 30 cm, How many atoms are there in this section
A 50 g ball is fired horizontally with initial speed v_0 toward a 110g ball that is hanging motionless from a 1.10 m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 110g ball swings out to a maximum angle the..
A professor's office door is 0.9 wide, 2.2 high, 4.2 thick; has a mass of 23 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. while the door is open and at rest, the door closer exerts a torqu..
A person sees clearly wearing eyeglasses that have a power of -5.00 diopters, If the person wants to switch to contact lenses placed directly on the eyes, what lens power should be prescribed
A glass fiber with a thermal expansion coefficient of 5x10^6 C^-1, an elastic modulus of 72 GPa, Calculate the maximum flaw size that this fiber can tolerate
A box stands against the wall of a cylinder that is rotating. The cylinder has a radius of 30cm. What is the minimum consant speed (magnitude of linear velocity) the box must move so it doesn't slip
what is the coefficient of kinetic friction between the box and the tabletop.
A person with mass mp = 70 kg stands on a spinning platform disk with a radius of R = 2.13 m and mass md = 187 kg. What is the final angular velocity of the disk
Two long thin parallel wires 13.0 cm apart carry 32 A currents in the same direction. Determine the magnetic field at point P, 12.0 cm from one wire and 5.0 cm from the other.
Does the growth of a plant or animal violate the second low.
A 30-meter steel tape is correct at a temperature of 20.0(C). The distance between two points, What is the true distance between the points
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