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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?
A father (m = 65 kg) and son (m = 38 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3.0 m/s after they have separated. How fast would the father be moving.
The turbines in a hydroelectric plant are fed by water falling from a 50-m height, what is the mass flowrate of water required to power a 200-watt light bulb
Through 5 successive 1.04 min intervals, a runner moves at the following constant speeds: 0.405 km/min, 0.220 km/min, 0.160 km/min, 0.163 km/min, and 0.323 km/min. compute the total distance travelled and average speed.
In a magnetic field with B=0.50 T, for what path radius will an proton circulate at 0.10 to the speed of light? What will its kinetic energy be? What will change if we replace a proton with a neutron? Why?
A house painter is standing on a uniform, horizontal platform that is held in equilibrium by two cables attached to supports on the roof. How large is the force exerted by the right-hand cable
How much magnetic potential energy is dissipated when the magnetic field is quenched in this way? Express your answer with the appropriate units. U^B=1.3 x10^6 J
Suppose the player has a mass of 0.658 kg. How long might the player operate on the energy required to lift it through a height of 1.17 m.
It takes four hydrogen nuclei to create one helium nucleus in the proton-proton chain, How much mass is converted into energy to create four helium nuclei
Calculate the angular momentum of the Earth about its own axis, due to its daily rotation. Assume that the Earth is a uniform sphere
A railroad car of mass 3.3 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, How much kinetic energy is lost in the collision
Beginning at time t = 0 s, the field is increased at a uniform rate until it reaches 1.30 T at t = 10.0 s. The field remains constant thereafter. What is the magnitude of the induced emf in the coil at the t=5s?
A ray of light is incident on the outer glass wall of an aquarium which have a refractive index of 1.51. If the reflected portion of the light is completely polarized at what angle to the normal does the ray enter the water
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