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A 0.014 kilogram record with a radius of 15 centimeter rotates with an angular speed of 30 rpm. Evaluate the angular momentum of the record?
A small postage stamp is placed in front of a concave mirror (radius = 1.1 m), such that the image distance equals the object distance. (a) What is the object distance
A 2.0 kg mass moves with a speed of 5.0 m/s. It collideshead-on with a 3.0 kg mass at rest. If the collisionis perfectly inelastic, what is the speed of the masses after the collision
Use the value of the Sun's luminosity (3.90×10^26 watts, or 3.90×10^26 joules per second) to calculate what mass of hydrogen the Sun will convert into helium during its entire main-sequence lifetime of 1.2×10^10 years.
A charge of -0.62 m/C with an unknown mass hangs vertically from a string. A uniform electric field, which runs parallel to the ground (in the + x direction) is then turned on.
a girl of mass 40 kg is in a rocket ship an altidude of 35 km above the surface of the earth. Find the gravitational force on the girl by the earth
If the electric field at a point in space has a manitude of300 volts/meter, about how far apart are the equipopoetnial surfaces that differ by 10 volts?
a speed boat starts from rest and accelarates at +2.01m/s^2for 7 seconds at the end of this time the boat continues foran additional 6 seconds with an accelaration of +0.518 m/s^2, find total displacement of the boat
a biophysicist grabs the ends of a dna strand with optical tweezers and stretches it 27um . how much energy is stored
A small blob of putty of mass m = 90.0 g falls from the ceiling and lands on the outer rim of a turntable of radius R = 15.0 cm, find the postcollision angular speed of the turntable-putty
three identical electrically charged balls each of mass 2 kg are suspended from a common point with strings of the same
A crane at a construction site lifts a concrete block with a mass of 440 kg from the ground to the top of a building with a height of 15.0 m, If the duration of the lift was 3.00 minutes, then what was the average power performed by the crane
The resistance across your (wet) tongue, from one side to the other near the tip, is 375 ? (assume that your tongue is an ohmic material). What current is flowing through the saliva that coats your tongue
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