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California's Bay Area Rapid Transit System (BART) uses an automatic braking system triggered by earthquake warnings. The system is designed to prevent disastrous accidents involving trains traveling at a maximum of112km/hr and carrying a total of some 45,000 passengers at rush hour. It takes a train 24s to brake to a stop.
Carbon-14 datin of ancient objects requires that material to be organic in order to assay its age. You hear someone sat that a dinosaur bone ws carbon dated to be 75 million yaers old. What are two specific reasons that this claim is incorrect?
determine a set of non-orthogonal base vectors a j k b i k and c i j.a establish their reciprocal vectors and
Think about an infinite coaxial cable. In the region 0 2 into the page. In the region a 0 . What is the magnetic field in all space, and what value must k have so that the field vanishes for r>b?
A 52.0 kilogram ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 1.50 turns every second. Determine what horizontal force must her wrist exert on her hand
Two charged particles of equal magnitude (+Q and +Q) are fixed at opposite corner of a square lying in a plane. What is the direction of the force on the test charge due to the two other charges
A 21.00 kg block is pushed up a frictionless inclined plane that makes an angle of θ = 39o with the horizontal direction. What force is required to move the block with constant speed? Suppose that the force is parallel to the surface of the plane.
A man is pulling a 40.0 kg crate across a level floor with a horizontal force, and the coefficient of kinetic friction is ?k = 0.59 for the crate and the floor. What is the normal force acting on the box
Identify the equation below which is dimensionally incorrect. A, x, y and r have units of length. k here has units of inverse length. vo and v have units of velocity. a and g have units of acceleration. w has units of inverse time.
Light of wavelength 700nm falls on two slits and produces an interference pattern in which the third-order bright red fringe is 39mm from the central fringe on a screen 2.8m away. What is the separation of the two slits
A box weighs 190 N on earth., What is its mass (kg) on Jupiter and What is its weight (N) on Jupiter where free-fall acceleration is 25.9 m/s^2
Two sinusoidal waves of the same period, with amplitudes of 8.0 and 11.0 mm, travel in the same direction along a stretched string; they produce a resultant wave with amplitude of 16.952 mm. The phase constant of the 8.0 mm wave is 0. What is the pha..
two point charges are on the y-axis. a 5.0 microc charge is located at y 1.10 cm and a -2.00 microc charge is located
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