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About how many elements are known at present? About how many occur naturally in our environment?
Name the two elements that predominate in
(a) the Earth's crust,
(b) the Earth's core,
(c) the human body, and
(d) the air. In each case,
list the more predominant element first.
A 500 gram dynamics cart starts at rest and rolls down a track thatis 2.5 meters long and elevated 15 cm on one end. At thebottom of the track it rolls onto a level surface and then collideswith a 1200 g cart that is sitting still. The collision i..
A car initially traveling eastward turns north by traveling in a circular path at uniform speed, Determine its average acceleration during the 30.0-s interval
A tank, full of liquid of depth h, and top surface area A, is at rest on a frictionless table. Find the radius of the hole in terms of the h, k, ?, x, and g the acceleration of gravity
The sound intensity in front of a loudspeaker diaphragm vibrating at 2kHz is 4.3 W/m^2, with an acoustic power output of 0.3W. Calculate the diameter of the diaphragm. in cm
A running student has half the kinetic energy that his younger brother has. The student speeds up by 1.3 m/s, at which point he has the similar kinetic energy as his brother. If the student's mass is twice as large as his brother's mass, what were th..
A 52.6-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -2.29 m/s. Her hands are in contact with the wall for 1.26 s. Ignore friction and wind resistance.
A 92-keV x-ray is Compton-scattered through an angle of 10o. What is the energy of the x-ray after scattering
A coiled wire forms a spiral with 243 turns, a diameter of 2.3 cm, and an unstretched length of 27 cm. Determine the self-inductance of the coil
question a moving conductor is a part of a rectangular circuit. the velocity of moving conductor is 4ms and the length
A pair of speakers separated by 0.700m are driven by the same oscillator at a frequency of 658 Hz. An observer, originally positioned at one of the speakers, begins to walk along a line perpendicular to the line joining the speakers.
A golf ball is driven from a level fairway. At a time of 5.32 s later, the ball is traveling downward with a velocity of 55.2 m/s at an angle of 26.0° below the horizontal. Neglecting air resistance, calculate the initial velocity (magnitude and dire..
A charge of -0.600microColoumbs exerts an upward 0.250N force on an unknown charge 0.250m directly below it. What is the magnitude of the force that the unknown charge exerts
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