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A uniform .20-kN board of length L has two objects hanging from it : 300N at exactly L/3 from one end, and 400 N at exactly 3L/4 from the same end. What torques are being exerted on the board?
A small mailbag is released from a helicopter that is descending steadily at 2.13 m/s. what is the speed of the mailbag
Illustrate what is the magnitude of the apparent weight of a 79 kg astronaut 5100 km from the center of the Earth's Moon in a space vehicle moving at constant velocity?
A person with mass m1 = 60 kg stands at the left end of a uniform beam with mass m2 = 107 kg and a length L = 3.5 m. What is the location of the center of mass of the system
You do 6.5 J of work to stretch a spring with k = 190 N/m , starting with the spring unstretched. How far does the spring stretch
A single electron orbits a lithium nucleus that contains three protons (+3e). The radius of the orbit is 1.76 10-11 m. Determine the kinetic energy of the electron.
An ultracentrifuge having a diameter of 16.3 cm produces an extremely large acceleration of 4.41E+5 m/s2. What is the angular speed of the centrifuge
A suitcase (mass m = 18 kg) is resting on the floor of an elevator. What pressure (in excess of atmospheric pressure) is applied to the floor beneath the suitcase
An ammeter with an internal resistance of 53.0 ? measures a current of 5.75 mA in a circuit containing a battery and a total resistance of 1290 ?. Determine the actual value of the current
A parallel-plate capacitor has circular plates and no dielectric between the plates. Each plate has a radius equal to 2.3 cm and the plates are separated by 1.1 mm. Charge is flowing onto the upper plate (and off of the lower plate) at a rate of 5..
An electric field of 7.90 x10^5 V/m is desired between two parallel plates, each of area 41 cm2 and separated by 2.45 mm of air. What charge should be on each plate.
suppose that visible light enters a Plexiglas cube containing water at a 20o angle of incidence, travels through the water and exits the cube.
A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. what is the smallest insect a bat can detect
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