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To estimate the size of the moon, a person holds a round pencil of diameter 0.70 cm. When the pencil is 77 cm in front of his eye, What is the angle subtended by the moon
A 20.0kg light signal hangs from the end of a 7.0m uniform density pole of mass 12.0kg. The pole is free to swivel from the hinge at point A, What is the reaction force (magnitude and direction) at the hinge
a major leaguer hits a baseball so that it leaves the bat at a speed of 28.5 and at an angle of 35.7 above the
A box is pushed across the floor, slide with a constant velocity, and is opposed by a friction force of 25N. What is the magnitude of the force? Choose the correct answer. A.Less than 25N B.Zero C.Greater than 25N D.25n
An arrow has a velocity of 45.0 m/s when it reaches a straw target. estimate its average acceleration while coming to rest
What is an electric potential at a point
q1. an antelope moving with constant acceleration covers the distance 79.0 m between two points in time 6.70 s. its
A worker is testing a multiple pulley system to estimate the heaviest object that he could lift. The largest downward force he could exert is equal to his weight 875N. When the worker moves rope1.5m the object moves 0.25m. What is the heaviest object..
A 0.800nm x-ray photon is incident upon a free electron, andthe electron recoils with a speed equal to 1.40x106m/s. Through what angle was the photon scattering
A 57.3-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.770 and 0.405, What horizontal pushing force is required to just start the crate moving
A highway patrolman sends a 24.150-GHz radar beam towards a speeding car. The reflected wave is lower in frequency by 4.04-kHZ
A mass spectrometer,sketched below, is a device used to separate different ions. Suchions with a well-defined velocity vo enter through aslit into a region of uniform magnetic field B, where they follow asemicircular path until they strike the detec..
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