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A uniform plank of length L leans against a vertical wall, its head a distance h above the horizontal ground. If we let go of the plank from rest, how far above the ground is the head of the plank the moment it loses contact with the wall?
A hard-thrown tennis ball is moving horizontally when it bangs into a vertical concrete wall at perpendicular incidence. What are the directions of its velocity and acceleration just before hitting the wall
Two identical cylinders (except for their volumes) at the same temperature each contain the same kind of gas and the same numberof moles of gas. If the volume of cylinder A is 6 times greater than the volume of cylinder B,what can you say about the r..
A 1000-kg rocket has a net propulsion force of 20 kN (kiloNewtons). What is the net work done on the rocket in kilojoules (kJ)
An automobile with a mass of 2250 slugs is driven around a circular curve, What is the centripetal force on the car
When the knob of a certain radio tuning capacitor is turned, the effective area of the plates in the interleaved position is reduced from 40 cm^2 to 10cm^2, What is the ratio of initial to the final capacitance
At what angle to the surface must a submerged diver in the lake look toward the surface to see the setting sun just along horizon.
A square conducting loop has side a and carries clockwise current I as shown in the diagram. calculate the magnitude and direction of the magnetic field at the center of the square
The rms current in an RL circuit is 0.28 A when it is connected to an ac generator with a frequency of 60.0 Hz and an rms voltage of 25 V. (a) Given that the inductor has an inductance of 170 mH, what is the resistance of the resistor? ? (b) Find the..
A microscope has an objective lens with a focal length of16.22mm and an eyepiece with a focal length of 9.60mm. what is the actual diameter of the red blood cell
A mass on a spring has an angular oscillati0n frequency of 2.81 rad/s. what is the potential energy stored in the mass-spring system
Consider a uranium nucleus to be a sphere of radius R = 7.4x10^-15 m with a charge of 92 e distributed uniformly throughout its volume. What is the electric force exerted on an electron
Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold with a mass of 4.622 g, is pressed into a leaf of 3.941 µm thickness, what is the area ..
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