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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.
A tennis ball on Mars, where the acceleration due to gravity is 0.379g and air resistence is negligible, How fast was it moving just after being hit
A1.8-kg block is pushed up against a spring whose force constant is650 N/m, compressing it 5.1 cm. When the block is released it moves horizontally without friction until it launches off the edge of a table 0.53 m above the ground. Discover the horiz..
An electric heater is rated at 1500 W, a toaster at 750 W, and an electric grill at 1000 W. The three appliances are connected in parallel to common 120 V household circuits.
An object is placed to the left of a convex lens and on the optical axis. find the magnification of the image formed by the lens
As a city planner, you receive complaints from local residents about the safety of nearby roads and streets, Given that the goal is to allow all vehicles to come safely to a stop before reaching the intersection, calculate the maximum desired speed ..
An electron is moved from point A to point B in a uniform electric field and gains 5.4010^-15 J of electrostatic potential energy. Calculate the magnitude of the electrostatic potential difference between the two points.
If you push an ice cube through space is there a thermal energy transfer happening?
A pulled tablecloth exerts a frictional force of 0.6 N on a plate with a mass of 0.2 kg. What is the acceleration of the plate? Round the final answer to the nearest whole number.
the title of your presentation isnbspwater an overlooked essential nutrient.nbspa law firm has requested that you
A mass spectrometer has an adjustable magnetic field. When the magnetic field is 7.000e-2 T, a singly ionizedhydrogen atom (a proton) will strike the detector at a particularlocation. Suppose a triply-ionized carbon 12 atom, whose mass is bydefini..
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 32.5 dB. What is the intensity delivered to the eardrum
A step-down transformer is used for recharging the batteries of portable devices. The turns ratio N2/N1 for a particular transformer used in a CD player is 4:15. obtain the rms output voltage of the transformer
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