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A sturdy 2.44m board is to be used to raise one corner of an automobile to remove a tire. If that corner of the car weighs about 2000N and the pivot under the board can be no closer than 20.0cm from the end of the board supporting the car, calculate the mass required at the other end of the board to hold the tire off the ground. Assume the board will be in a horizontal position? A solid disk with m=60.0kg and a diameter of 48.0cm is to be turned from rest through 12.0 revolutions in 6.00s. Calculate the torque required to accomplish this? Mass m1=10.0kg is located at the origin of a coordinate system. Mass m2=20.0kg is 1.20m to the right along the x axis. Mass m3=25.0kg is 90.0cm above the origin along the y axis. Find the coordinates of the center of mass of this system?
A ray of light is incident at an angle of 30 deg. to the normal on an air glass interface. find the angle the refracted ray makes to normal
A point charge of 8.40 mC is surrounded by an equipotential surface with a radius of 0.298 m. What is the electric potential on the surface
What is the total negative charge, in coulombs, of all the electrons in a small 1.05 gram sphere of carbon? One mole of carbon is 12 grams
Explain the physical phenomenon which causes the lower limit of the tunneling resistance of the source-QD and drain-QD junctions in a single electron transistor?
Calculate the centripetal force on the motorcycle.
A particle with a charge of q = -5.10 nC is moving in a uniform magnetic field of vec{B}=( -1.24 T ) hat{z}. The magnetic force on particle is measured to be vec{F}= ( -7.60×10-7 N )hat{y}.
A peregrine falcon dives at a pigeon. The falcon starts with zero downward velocity and dives with the free-fall acceleration. how long does it take the falcon to intercept the pigeon
Determine the amplitude of the resultant wave when two sinusoidal string waves having the same frequency and traveling in the same direction on the same string are combined
When Neil Armstrong was on the moon he used a spring scale to measure the mass of several rocks. What is its actual mass
A Cepheid variable has been found to have a period of 22 days, from this its luminosity is determined to be 2.8 x 1029 W, Use this information to calculate the distance to the Cepheid
A ladder weighs 150N, is 5 meters long, and is leaning against a frictionless wall at an angle of 30 degress with the horizontal. A person who weighs 300N is 2/3 the way up the ladder. The ground has an unknown coefficient of friction. What is the mi..
an electron that has a horizontal initial speed of 4.50e6 ms enters a region that has an electric field of 120 vm
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