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A 4.3 meter long plank with a weight of 164 Newton is place on a dock with 1.4 meter of its length extended over the water. The plank is uniform in density. A boy with a weight of 141 Newton is standing on the plank and moving out slowly from the edge of the dock. Find how far from the edge of the dock can the boy move until the plank is just on the verge of tipping?
a uniform rod of length 200cm is bent at its midpoint into a right angle. then the bent rod is placed along the
peg is located a distance h directly below the point of attachment of the cord. If h = 0.90 L, illustrate what will be the speed of the ball when it reaches the top of its circular path about the peg?
Superman leaps in front of Lois Lane to save her from a volley of bullets. Determine the average force exerted on Superman chest if the bullets bounce back after an elastic, head-on collision
A skateboarder shoots off a ramp with a velocity of 6.6 m/s,directed at an angle of 58° above the horizontal. The end ofthe ramp is 1.2 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take a..
A projectile is launched on an unnamed planet. The projectiles vertical position is y(t)= -5t^2 + 15t +50, find the vertical velocity of the projectile launched
A bar is used to lift a 100 kg block of concrete. The pivot is 1.00 m from the block. Find the mechanical advantage
the index of refraction of the core of a piece of fiber optic cable is 1.76. if the index of the surrounding cladding
A gun shoots bullets that leave the muzzle with a speed of 338 m/s. If a bullet is to hit a target 104-m away at the level of the muzzle, the gun should be aimed at a point above the goal.
a 12-pack of omni-cola mass 4.30 kg is initially at rest on a horizontal floor. it is then pushed in a straight line
To see that it is easy to break a thighbone when falling in this fashion, find out the greatest distance through which his center of gravity can fall without his breaking a bone.
A spherical navigation buoy is tethered to the lake floor by avertical cable. Determine the tension in the cable
A 3 ohm resistor is mounted in parallel with a resistor R=11 ohm , and this combination is connected in series with an 4 ohm resistor and a 12 Volts battery. What is the current through the R resistor? Amp
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