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A 4.2 m long uniform beam is supported by a cable at its center. A 69 kg steelworker stands on one end of the beam, and a bucket of concrete is suspended from a point 76 cm from the beam's center, on the other side of the center from the steelworker. What's the mass of the bucket and concrete?
A 15 g rifle bullet traveling 190 m/s buries itself in a 3.8 kg pendulum hanging on a 3 m long string, that makes the pendulum swing upward in an arc. Determine the horizontal component of the pendulum's maximum displacement.
A closed gas system initially has volume and temperature of 4360mL and 646.0C with the pressure unknown. what was the initial pressure in torr
a batter hits a pitched ball when the center of the ball is 1.33 m above the ground.the ball leaves the bat at an angle
A sample of air at a temp of 298K has a relative humidity of 10%. If the temp of 1.00L of this air is decreased to 273K, what will the relative humiduty be at the lower temp
A newly discovered planet has a mean radius of 5370 km. A vehicle on the planet\'s surface is moving in the same direction as the planet\'s rotation, what is the period of the planet\'s rotation
A refracting telescope is used to view the Moon (diameter 3480 km, distance from Earth 385,000 km). What should be the distance between the lenses
Small charged sphere, mass m = 1.2 x 10-4 kg and charge q = 3.2 nC is suspended (floating) a very small distance above a very large sheet charge due to electrostatic forces. What is the charge density (charge per area) of the sheet essential for this..
a "wien" velocity filter uses an electric field and a magnetic field that are at right angles to each other. what is the energy of the proton beam
The pilot of an airplane with a speed of 280 km/hr relative to the air, wishes to fly due east from the city A to city B. How long will the trip take
A fish appears to be below the surface of a pond (n=1.33). Calculate what is its actual depth
Scientist develop a new heat lamp to keep chicks warm in an incubator. It has a conversion efficiency of 6.5% of its input to radiant energy. how much radiant power does it output
You drop a stone into a deep well and hear it hit the bottom 1.80 s later. This is the time it takes for the stone to fall to the bottom of the well, plus the time it takes for the sound of the stone hitting the bottom to reach you. Sound travels ..
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