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A box that weighs 400 lb is pulled up an inclined plane that is 15 ft long (measured diagonally) and 5 ft high. The force required to pull the box up the plane at a slow uniform speed is 200 lb. Find the ideal mechanical advantage and actual mechanical advantage of the plane. Also, Find the coefficient of friction between the box and the plane.
What is the magnitude of an electric field in which the electricforce it exerts on a proton is equal in magnitude to the proton's weight?
A 0.03 kg (lead) bullethits a steel plate and melts and splatters on impact. Assuming that the bullet recieves 80% of the collision energy, at what minimium speed must it travel to melt on impact? How is this soved without knowing what the bullet ..
An isotope of the element Thalium, TI-206, what mass of the isotope will be left after 9.3 minutes have elapsed
A proton travels horizontally with speed 4 x 10^6 m/s in a vertical uniform magnetic field of 1.5 tesla (1.5 x 10^4 gauss). Find the magnitude of proton's accelerations
The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0.250 mW. Find the peak magnetic field strength
a sheet of glass has nred 1.52 and nviolet 1.55. a narrow beam of white light is incident on the glass at 30 degrees.
The change in the kinetic energy of the system
A mass of 20g is attached to a spring, and undergoes simple harmonic motion with a period of T=0.7 s. The total energy of the system is E=2.5 mJ. What is the force constant of the spring? What is the amplitude of the motion?
cold sodium atoms near absolute zero in a state called a bose-einstein condensate can slow the speed of light from its
q1. oxygen o2 gas within a piston-cylinder assembly undergoes an expansion from a volume v1 0.02 m3 to volume v2 0.03
A block of mass 5 kg slides without friction at a speed of 8 m/s on a table, How far is the spring compressed before the masses come to a rest
A lightning flash may transfer up to 30 C of charge through a potential difference of 10^8 V. How much energy does this involve
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