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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.
On a planet in a solar system far from ours, you release a rock from rest at a height of 16 m above the surface of the planet and you find that it takes the rock 3 seconds to reach the surface. What is the radius of the planet
A running student has half the kinetic energy that his younger brother has. The student speeds up by 1.3 m/s, at which point he has the similar kinetic energy as his brother. If the student's mass is twice as large as his brother's mass, what were th..
A parallel-plate capacitor is formed from two 5.0cm -diameter electrodes spaced 2.9mm apart. What is the charge (in nC) on each electrode
A 5.00 gram object moving to the right at +20.0 cm/s makes an elastic head-on collision with a 10.0 gram object that is initially at rest. Determine the percentage of the initial kinetic energy transferred to the 10.0 gram object
A rapid transit train accelerates at 1.5 m/s^2, cruises at 25 m/s, and decelerates at 3.5 m/s^2 when stopping. obtain how long does the train take to travel from one to the other
A projectile is shot directly away from Earth's surface. Neglect the rotation of Earth. What is the least initial mechanical energy required at launch if the projectile is to escape Earth
A weightless spring of force constant 2.50 N/cm is 15.0 cm long when nothing is attached to it. It is now utilized to pull horizontally on a 12.5 kg box on a smooth horizontal floor. You observe that the box starts from rest and moves 96.0 cm through..
A 2.00 m long rope is stretched between two supports with a tension that makes the speed of transverse waves 48.0 m/s. What are the wavelength of the second overtone
A 7.0 g bullet is fired into a 1.5 kg ballistic pendulum. The bullet emerges from the block with a speed of 200 m/s, and the block rises to a max height of 12 cm. Find the initial speed of the bullet.
A projectile is shot on level ground with a horizontal velocity of 20 m/s and a vertical velocity of 42 m/s. Obtain how much time is the projectile in the air
An arrow is fired with a speed of 20.0 m/s at a block ofStyrofoam resting on a smooth surface. how far into the block does the arrow penetrate
It is possible to shoot an arrow at a speed as high as 119 m/s. If friction is neglected, how high would a narrow launched at this speed rise if shot straight up? How long would the arrow be in the air?
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