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Observation or experiment? In a study of the relationship between physical fitness and personality, middle-aged college faculty who have volunteered for an exercise program are divided into low-fitness and high-fitness groups on the basis of a physical examination. All subjects then take a personality test. The high-fitness group has a higher average score for "self-confidence."
(a) Is this an observational study or an experiment? Why?
(b) We cannot conclude that higher fitness causes higher self-confidence. Suggest other relationships among these variables and perhaps lurking variables that might explain the higher self-confidence of the high-fitness group.
an antelope moving with constant acceleration covers the distance 66.0m between two points in time 6.80s. its speed as
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he car is suspended beneath the helicopter by a steel cable. Illustrate what is the lift force exerted on the air by the helicopter's rotor?
would you get the same relationship between distance up the ramp parallel to the ramp rather than height and stopping
Write a report on the operations and symmetries
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Design a decorative "mobile" to consist of a low-mass rod of length 0.46 m suspended from a string so that the rod is horizontal, find the tension in the string that supports the mobile
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