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Bailey is trying to save a young girl under a 15 m long wooden beam. She lifts the beam up from one side with a force of 25 N using her nose. The angle between the force she exerts on the beam and the beam itself is always 90o. The other side of the beam does not move. What is the magnitude of the torque that Bailey puts on the beam?
______________ Nm
A point charge q = -2.4 nC is initially at rest adjacent to the negative plate of a capacitor, What is the kinetic energy of the point charge just before it hits the positive plate
A loudspeaker of mass 23-{rm kg} is suspended a distance of h = 1.80- {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.10- {rm m}. What is the tension T in each of cables.
An electron and a proton are each placed at rest in a uniform electric field of magnitude 546 N/C. Compute the speed of each particle 52 ns after being free.
estimate the speed of the car just before braking. how much time passes before the brick lands on the ground..
George just graduated from college and is going on his first job interview. He has learned that there are two other candidates. Because of the information he has learned about the serial position effect, George asks to be either the first or the last..
What is the necessary metabolic power? Hint: You can model her power needs as the sum of the power to walk on level ground plus the power needed to raise her body by the appropriate amount. Express your answer to two significant figures and include t..
Calculate the velocity of the object for an elapsed time of t=1s. Use the formula v=v0+at, these use the v0,and the value for acceleration you determined in previouse step. PROBLEM:V=Vo+at Vo is 3.8 m/s a=1.2m/s^2
A proton is at the origin and an electron is at the point = 0.45 , = 0.31 . Find the electric force on the proton.
A 10.00kg box on a smooth, frictionless, horizontal surface experiences a downward force of 30n at an angle of 40 degrees to the horizontal. The box moves 1.50 m to the right. What was the work done by gravity.
Two charged pith balls are suspended on very light 10.7 cm strings. Each has a mass 11.0 g. In stability, the total angle between the strings is 37 degrees. Draw the free body diagram for one of the pith balls and clearly label all forces with magnit..
Suppose you point a pinhole camera at a 15-m-tall tree that is 75m away. If the film is 22cm behind the pinhold, what will be the size of the tree's image on the film
When an 82.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2 x 10^3 J. By how much does the potential energy of a 17 kg child increase when the child climbs a normal sta..
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