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The drawing shows two boxes resting on frictionless ramps. Onebox is relatively light and sits on a steep ramp. The other box isheavier and rests on a ramp that is less steep. The boxes arereleased from rest at A and allowed to slide down the ramps. Thetwo boxes have masses of 9 and 38 kg. If A and B are3.0 and 1.5 m, respectively, above the ground,determine the speed of (a) the lighter box and(b) the heavier box when each reaches B.(c) What is the ratio of the kinetic energy of the heavier box to that of the lighter box at B?
a space vehicle is moving at a speed of 0.85c with respect to an external observer. what is the speed of the project as seen by the external observer
A block is shoved up a 22 slope with an initial speed of 1.4 . The coefficient of kinetic friction is 0.70. How far up the slope will the block get
two dry-ice pucks covered with plasticine are on a collisioncourse; one of the mass 467g travles south at a speed of 2.6m/s. calculate their speedand direction of travle
question the collision between a hammer and a nail can be considered to be approximately elastic. calculate the kinetic
Lightning As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 470m to be the other plate. How much charge can the cloud hold before the dielectric strength of the air is ex..
A thick-walled, non-conducting spherical shell has a positive uniform volume charge density p bounded by radii r1 and r2>r1. With V=0 at infinity, Find the net charge of the shell
a 3 micro coulomb charge is uniformly distributed on a ring of radius 11 cm.the value of the coulomb constant is 8.99
at a baseball game on a cool day air temperature of 16oc a fan hears the crack of the bat 0.25 s after observing the
Calculate the coil's self-inductance. If the current decreases uniformly from 5.00 to 2.00 in 3.00, estimate the self-induced emf in the coil.
A patient with thyroid problems has radioactive iodine (123I53) deposited in his thyroid gland. If the 123I53 has an initial activity of 2.5 MBq, what is its activity after 24 days
a father racing his son has half the kinetic energy of the son who has half the mass of the father.the father speeds up
two identical twins a and b are each 20 year old when b starts on a round trip to a star 10 light years away. if he
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