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Problem:
A medical experiment compares an antidepressant medicine with a placebo for relief of chronic headaches. There are 36 headache patients available to serve as subjects. To choose 18 patients to receive the medicine, you would
(a) assign labels 01 to 36 and use Table B or a random number generator to choose 18.
(b) assign labels 01 to 18, because only 18 need to be chosen.
(c) assign the first 18 who signed up to get the medicine.
A typical wall outlet voltage is 120 volts in the United States. Personal MP3 players require much smaller voltages, typically 709.5 mV. If the number of turns in the primary coil is 1353, calculate the number of turns on the secondary coil of the ad..
point a is at position 4j -3kcm. point b is at position -3cm k. point c is at position 3i -2j 5k cm. point d is at
A 25kg solid door is 220cm tall, 91cm wide. What is the door's moment of inertia for rotation about a vertical axis inside the door, 15cm from one edge.
A river flows due east at 1.34 m/s. What is the velocity of the boat as viewed by an observer on the shore
When looping the loop, the Blue Angels stunt pilots of the U.S Navy fly their jet aircraft along a vertical circle of diameter 1000 m. At the top of the circle, find the acceleration relative to the aircraft of a small body
two horizontal forces f1 and f2 are acting on a box but only is shown in the drawing. f2 can point either to the right
two strings with linear densities of g/m are stretched over pulleys, and attached to hanging blocks (string 1 is 20 kg=mass of block)-50 cm away. what is the unkown mass
Oily n =1.38 finger.prints on a glass plate n = 1.52 preferentially reflect light with a frequency of 550 mm. What is the thickness of the finger print
An ice skater is gliding horizontally across the ice with an initial velocity of +6.92 m/s. How much time elapses before her velocity is reduced
What is the time constant of a 8.5 nm -thick membrane surrounding a 3.8 x 102 mm -diameter spherical cell? Assume the resistivity of the cell membrane as 3.6 x 106 m and the dielectric constant is approximately 9.0.
An ideal gas is enclosed in a cylinder with a movable piston on topof it. The piston has a mass of 8000 g and an area of 5.00cm2 and is free to slide up and down, keeping the pressure of the gas constant.
a concave spherical mirror has a radius of curvature of magnitude 17.4 cm. a determine the object position for which
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