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A firefighter who weighs 712 N slides down a vertical pole with an acceleration of 3.00 m/s2, directed downward. What are the (a) magnitude and (b) direction (up or down) of the vertical force on the firefighter from the pole and the (c) magnitude and (d) direction of the vertical force of the pole on the firefighter?
The membrane that surrounds a certain type of living cell has a surface area of 7.1 x 10-9 m2 and a thickness of 1.1 x 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 5.4. The potential on ..
An 8 g bullet is fired into a 2.5 kg ballistic pendulum and becomes embedded in it. If the pendulum raises a vertical distance of 6cm, compute the initial speed of the bullet.
A 0.6 kg block of ice is sliding by you on a very slippery floor at 3.5 m/s. As it goes by, you give it a kick perpendicular to its path. Your foot is in contact with ice block for 0.0035 seconds.
Air flows from a reservoir maintained at 400 kPa absolute and 20-C out a nozzle with a 10-cm-diameter throat and a 20-cm-diameter exit into a receiver. Estimate the receiver pressure needed to locate a shock wave at a diameter of 16 cm. Also, find..
The current in a 50.0 mH inductor changes with time as I = 2t2 - 5t (in SI units). At what time is the emf zero
A ball is thrown vertically upward and then comes back down. Describe the behavior of the ball's velocity and acceleration
An inductor has a cross-sectional area of .03m2 and a length of 4 cm. When the current running through it changes from 6A to 10 A in .2 s
Two point charges q units each placed 2 m apart exert a force the f 20 N on eaother. What will be the force between them if third charge -q units is placed at the mid point of the link be joining the two charges?
The equation of a transverse wave on a string is y = (2.0 mm) sin[ (20 m-1)x - (600 s-1)t)]. Find the linear density of this string in grams per meter
Estimate the position of C.G or fulcrum & the masses of persons on a 16 feett sea saw, under balanced condition.
A singly charged ion of unknown mass moves in a circle ofradius 13.0 cm in a magnetic field of7.7 T.What is the mass of the ion
An 80-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall. If the ladder has amass of 20 kg and it makes an angle of 60 digress with the ground, discover the force of friction of the ground on the foot..
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