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Running red lights. The sample described in the previous exercise produced a list of 5024 licensed drivers. The investigators then chose an SRS of 880 of these drivers to answer questions about their driving habits.
(a) How would you assign labels to the 5024 drivers? Use Table B, starting at line 104, to choose the first 5 drivers in the sample.
(b) One question asked was "Recalling the last ten traffic lights you drove through, how many of them were red when you entered the intersections?" Of the 880 respondents, 171 admitted that at least one light had been red. A practical problem with this survey is that people may not give truthful answers. What is the likely direction of the bias: do you think more or fewer than 171 of the 880 respondents really ran a red light? Why?
A myopic (nearsighted) dancer wears eyeglasses that allow him to have clear distant vision. Without eyeglasses, what is the far point of the dancer
An automobile tire is inflated with air originally at 10.0°C and normal atmospheric pressure. During the process, the air is compressed to 26.0% of its original volume and the temperature is increased to 39.0°C.
A potter's wheel (a solid, uniform disk) of mass 7.0 kg and radius 0.65 m spins about its central axis. Calculate the moment of inertia of the system
A worker in a radiation lab recieves a whole-body radiation dose of 29 mrad. Her mass is 65 kg. The radiation delivered by alpha particles for which the RBE is 12. What was the total energy absorbed by her body
when a solid cylindrical rod is connected across a fixed potential difference a current i flows through the rod.what
A very long insulating cylinder of charge of radius 2.70 cm carries a uniform linear density of 18.0 nC/m, How far from the surface must the other probe be placed
A particular engine has a power output of 4.27 kW and an efficiency of 22.2%. The engine expels 7236 J of energy as heat in each cycle. Find the energy absorbed in each cycle
A space station is shaped like a ring and rotates to simulate gravity. If the radius of the space station is 116 m, at what frequency must it rotate so that it simulates Earth's gravity?
According to recent test data, an automobile travels 0.250 mi in 19.9 s, starting from rest. The same car, when braking from 60.0 mi/h on dry pavement, stops in 146 ft. Find the acceleration of this car when it is braking
One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. estimate the diameter of the pinhole
A 35 mm SLR camera has a 45 mm lens which is used to photograph a 15 m tall tree. What is the aperture diameter at this f/stop
A hiker weighing 565 N carries a 186 N pack up Mt. Whitney (elevation, 4420 m), increasing her elevation by 3000 m. Find the minimum internal work done by the hiker's muscles
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