In drug studies, using a double-blind experiment design ensures that

In medical experimentation, patients sometimes improve when they think they are receiving a new drug; thus it is often necessary to administer a placebo to a control group. In medical research, the experimenter may be more likely to "observe" improvements among patients who receive the experimental drug than among those receiving the placebo. A double-blind experiment eliminates this possibility because neither the subject not the experimenters know which is the experimental group, and which is the control group.

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t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanatio

answer:   you might love summer weather, but you don’t want it to feel like the sun is inside your car. but a hot car that just won’t seem to cool down might be a bigger of a problem than you think. your car relies on being at the right temperature.

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