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A 2.00 meter long horizontal plank whose mass is 3.00 kg is placed so that the very end (the right end) rests on a retaining wall. The left end is put on the tailgate of the truck. However the tailgate is tilted a bit, so it only contacts the board at a point 25 cm from the end. Find the force acting on the board by the tailgate. Find the force acting on the board by the retaining wall.
Suppose your favorite FM radio station broadcasts at a frequency of 99.9 MHz. What is the wavelenght of this signal
A skier of mass 106 kg travels down a frictionless ski trail. If the top of the trail is a height 206 m above the bottom, what is the work done by gravity on the skier
A plane traveling at 432km/h flies in a circle with a radius of 3820m. Calculate how long it takes to go once around the circle
What is the rms current in an RL circuit when a 60.0Hz 240V rms ac voltage is applied, where R = 1.80k? , and L = 420mH?, What is the phase angle between voltage and current
A solenoid is made by tightly wrapping a wire 0.30mm in diameter around a 4.0mm diameter cylinder. a) If the inductance of this solenoid is to be 10µH what must the length of the winding be
A batted baseball leaves the bat at an angle of 30.0^\circ above the horizontal and is caught by an outfielder 360 {\rm ft} from home plate at the same height from which it left the bat
At this point, person doing the laundry opens the lid, and a safety switch turns off the washer. The tub smoothly slows to rest in 11-s. Through how many revolutions does the tub turn while it is in motion.
Two identical 0.11 kg blocks (labeled 1 and 2) are initially at rest on a nearly frictionless surface, connected by an unstretched spring, how far did the center of mass of the real system move
Sound is passing perpendicularly through an open window whose dimensions are 1.1 m x 0.75 m. How much sound energy comes through the window in one hour
A 1,720 Hz pure tone is played on a stereo in an open field. A person stands at a point that is 4 m from one of the speakers, Does the person hear the tone
A swimmer, capable of swimming at a speed of 1.07 m/s in still water (i.e., the swimmer can swim with a speed of 1.07 m/s relative to the water), How long does it take the swimmer to cross the river
Amber (n = 1.546) is a transparent brown-yellow fossil resin. An insect, trapped and preserved within the amber, How far below the surface is the insect actually located
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