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A 169× astronomical telescope is adjusted for a relaxed eye when the two lenses are 1.33 m apart. What is the focal length of each lens?
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A 0.14-kg pinecone falls 16 m to the ground, where it lands with a speed of 13 m/s. What was the average force of air resistance exerted on the pinecone
If a ball has a net positive charge of 57 ?C, how many electrons must be added to make the ball neutral
a 25-N block slides down a plane inclined at 21.2 degrees to the horizontal with constant velocity. find the total force resisting the motion of the block
while john is traveling along an interstate highway he notices a 153 mile marker as he passes through town. later john
An object with a mass of 95 g displaces 755.9 ml of water when it is completely immersed. What is the buoyant force on the mass
a physical pendulum consists of a uniform solid disk (of radius R = 54.9 cm) supported in a vertical plane by a pivot located a distance d = 21.1 cm from the center of the disk. What is the period of the resulting simple harmonic motion
Tam walks with the velocity of 1.8 m/s west. He does so while riding on a conveyor belt that moves at a velocity of 0.7 m/s west. What is Tam's velocity.
A gymnast with mass m1 = 47 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 118 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left end ..
A circuit contains six 205 ohm lamps with 60 W bulbs and a 9 ohm heater connected in parallel. voltage across the circuit is 120 V.what is the current in the circuit when four lamps are turned on.
How far below the release point is the center of mass of two stones at t = 550 ms? (Neither stone has yet reached the ground.)
Anita and Nick are playing tug-of-war near a mud puddle. They are each holding on to an end of a taut rope that has a knot exactly in the middle. What is the location of the knot relative to the center of the puddle
A tall, slender drinking glass with a thin base is initially empty. Where is the center of mass of the glass
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