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Problem: Seat belt use. A study in El Paso, Texas, looked at seat belt use by drivers. Drivers were observed at randomly chosen convenience stores. After they left their cars, they were invited to answer questions that included questions about seat belt use. In all, 75% said they always used seat belts, yet only 61.5% were wearing seat belts when they pulled into the store parking lots.
Required:
Explain the reason for the bias observed in responses to the survey. Do you expect bias in the same direction in most surveys about seat belt use?
Water at a pressure of 13 atm, at street level, flows into a building at 3m/s through a 6 cm diameter pipe. The pipe tapers down to a 2 cm diameter by the top floor 50 m above. The density of water is 1,000 kg/m^3. Calculate the water pressure and ve..
A golfer, driving a golf ball off the tee, gives the ball a velocity of +31 m/s. The mass of the ball is 0.045 kg, and the duration of the impact with the golf club is 3.45 10-3 s.
An iceboat is traveling in a circle on the ice. Halfway around the circle, the sail and the steering mechanism fall off the boat. Which will most likely occur as a result?
When a potential difference of 172 V is applied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of 23.0 nC/cm2
A plank 2.00 cm thick and 17.9 cm wide isfirmly attached to the railing of a ship by clamps so that the restof the board extends 2.00 m horizontally over the sea below. find the shear modulus of the wood
A block is attached to a chord passing over a pulley through a hole in a horizontal frictionless surface. what is the new angular velocity
A skier starts down a 26 slope. After a vertical drop of 28 m, the slope temporarily levels out and then drops at 19 an additional 39 m vertically before leveling out again. What is the skier's speed on the lower level stretch
The heating element of a room heater is rated at 750W when itis operated from a 120V power supply? What is the resistance of the heating element?
Two meteoroids are 2.6×105 km from Earthand moving at 2.5 km/s. One is headed straight for Earth,while the other is on a path that will come within 8500 km of Earth's center. What is the speed of the first meteoroid when itstrikes Earth?
A crab eater seal jumps onto a horizontal ice floe with an initial velocity of 6 m/s horizontally. Determine how far does the seal slide
An adventurous archaeologist crosses between two rock cliffs by slowly going hand over hand along a rope stretched between the cliffs. He stops to rest at the middle of the rope (See the figure). The rope will break if the tension in it exceeds 3.00×..
An electric motor with a power of 3W is used to lift a .2 kg mass a height of 0.5 meters in 3.0 seconds, since total energy must be conserved
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