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A laser emits a narrow beam of light. The radius of the beam is 3.9 mm, and the power is 3.6 mW. What is the intensity of the laser beam?
two parallel infinite sheets carry positive unifrom surface charge densities sigma and 3 sigma. what is the magnetude of electrci field between the sheets
A positive charge of 0.800? C is located in a uniform field of 1.20×105 N/C. A negative charge of -0.400? C is brought near enough to the positive charge that the attractive force between the charges just equals the force on the positive charge du..
In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 13 m/s at an angle of 24° above horizontal. How high is the ball when it hits the wall
A well-engineered ski jump is less dangerous than it looks because skiers hit the ground with very small velocity components perpendicular to the ground. What is the slope of the ground in the landing zone
to combat wasteful habits we often speak of "conserving engery", by which we mean turning off lights, find the difference in energy conservation and conserving energy
What was the speed of the car when the brakes were applied.
A mass m1 = 5.4 kg rests on a frictionless table and connected by a massless string to another mass m2 = 4 kg, How much work is done by the force F on the two block system
A car starts from the origin and is driven 1.1 km south and then 3.5 km in a direction 53° north of east. what is the car's final location
initially a yoga ball is partially blown up and its surface area measured. afterwards it is filled completely and its
A friend is standing on a giant skateboard that is initially at rest. If you avoid frictional effects with the floor, what is the momentum of the skateboard if your friend walks to the right on skateboard with a momentum of 150 kg.m/s? What is the..
You hit a golf ball at a 61 degree angle, and it lands 120 m away, and 9 m down in a hole from it's original Y position. Find initial velocity and the maximum height
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -18.20 eV. What is the energy of the first photon emitted
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