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a) If your usual weight is 180 lbs and you are in an elevator, which is going up and speeding at a rate of 8 ft/s2, what will your apparent weight be in lbs? b) How about if it is going up and slowing at the same rate? c) How about going down and speeding at the same rate?
A laser emits a cylindrical beam of light 2.8mm in diameter.If the average power of the laser is 2.6mW , what is the rms value of the electric field in the laser beam?
A block of mass m is slides down africtionless inclined surface. The height of the block changes from h at the top to zero at the bottom of theincline. The block then slides across a frictionless horizontal surface and collides elastically with as..
You are traveling in a convertible with the top down. The car is moving at a constant velocity of 12.8 m/s, How far has the car moved when you get a chance to catch the tomato
a heat engine has an efficiency of 65.0% and receives 150 J of heat per cycle. How much work does it perform in each cycle
At t=0 a grinding wheel has an angular velocity of 30.0 rad/s. It has a constant angular acceleration of 31.0 rad/s^2 until a circuit breaker trips at time t = 2.00 s. From then on, it turns through an angle 428 rad as it coasts to a stop at constant..
A uniform 20.0 kg chain 2.00 m long supports a 55.0 kg chandelier in a large public building. Find the tension in the bottom link of the chain
A man with a mass of 71.3 kg stands up in a 61-kg canoe of length 4.00 m floating on water. How far does the canoe move
A racing dog is initially running at 15.0 m/s, but is slowing down. How fast is the dog moving when its kinetic energy has been reduced by half
a 200 g ball of putty falls vertically into a 2.50 kg cart that is rolling freely at 2.00 ms on a horizontal surface.
A baseball and a bowling ball are both rolled off a level table at the same time. which will hit the ground first
The tub of a washer goes into its spin cycle, starting from rest and gaining an angular speed of 5.00 rev/s smoothly in 10.0 s. At this point the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub slows smoothly..
the scientific method is used by scientists to understand the natural laws that the universe obeys. scientists are not
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