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Beating sunburn with broccoli. Some recent studies suggest that compounds in broccoli may be helpful in combating the effects of overexposure to ultraviolet radiation. Based on these studies we hope to show that a cream consisting of a broccoli extract reduces sunburn pain. Sixty patients suffering from severe sunburn and needing pain relief are available. We will apply the cream to the sunburn of each patient and ask them an hour later, "About what percent of pain relief did you experience?"
(a) Why should we not simply apply the cream to all 60 patients and record the responses?
(b) Outline the design of an experiment to compare the cream's effectiveness with that of an over-the-counter product for sunburn relief and of a placebo.
(c) Should patients be told which remedy they are receiving? How might this knowledge affect their reactions?
(d) If patients are not told which treatment they are receiving, the experiment is single-blind. Should this experiment be double-blind also? Explain.
A car engine with mass = 220 kg hangs from a light chain that is linked at ring O to two other light chains as shown
308 moles of helium at 7.45 x 105 Pa are held at 158 C. What is the volume in m3
A lead fishing weight with a mass of 57.0g absorbs 146cal of heat. If its primary temperature is 50 C, what is its final temperature.
a sled of mass 1 kg has an initial speed of 1.00m/s across a horizontal surface. the force of friction between the sled and surface is 0.2N. What is the speed of the sled after it ha traveled a distance of 2.00m
A converging lens with a focal length of 17.9 cm and a diverging lens are placed 26.0 cm apart, with the converging lens on the left. What is the height of the final image
On a winter day heat leaks out of a house at the rate of 2.5e4 kcal/h. At what rate does this process produce entropy
The stopcock is then closed, and the flask cooled to its original temperature. What is the final pressure of the ethane in the flask? Find the mass of ethane remaining in the flask.
n achromatic lens is made of two very thin lenses, with focal lengths f1 = -28.7 cm and f2 = +20.4 cm, What is the focal length of the achromatic lens
Two charged spheres are 8.45 cm apart. They are moved and the force on each of them is found to have been tripled. How far apart are they now.
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water
Zinc has a density of 7.14 g/cm3, and the mass of a zinc atom is 1.09 10-25 kg. What is the distance between the centers of adjacent atoms
A doubly charged ion (charge 2e) with velocity 6.9 × 106 m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer
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