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The UCL British Cohort study has followed the lives of over 17,000 people born in England, Scotland and Wales since 1970by testing them at nine different time points. At each of these time points, anew cohort of participants were added to the sample. This is an example of what type of study design?
A resistance is connected to a AC source with an rms output of 12 V and a frequency of 60 Hz, the rms current is found to be 2.4 A. When a capacitor is connected in series in this circuit the current drops to 1.4 A. What are the value of the resis..
A ball is thrown vertically downward from the top of a 31.3-m-tall building. What is the speed of the ball as it passes the top of the window
a disk of radius 0.2meters and mass 0.25kg is free to rotate without friction about an axis through its center and
A hotel elevator ascends 273 m with a maximum speed of 3.78 m/s. Its acceleration and deceleration both have a magnitude of 0.91 m/s2. How long does it take to make the complete trip from bottom to top?
If isentropic efficiency of the steam turbine ( as above ) is 0.82 - what is the Enthalpy of the steam discharged into the condenser and the thermal efficiency of the cycle
When responding to sound, the human eardrum vibates about its equilibrium position. Supposed an eardrum is vibrating with an amplitude of the 6.3*10^7 m and a maximum speed of 2.0*10^-3 m/s.
A water balloon is launched off the top of the bleachers at a velocity of 6.5 m/s at an angle of 45 degrees above the horizontal. If the bleachers are 15m above
A machine part rotates at an angular speed of 0.48 rad/s; its speed is then increased to 2.8 rad/s at the angular acceleration of 0.61 rad/s2.
The x-ray beam intensity is 1.50 W/m2, the area of the chest exposed is 0.0750 m2, 35.0% of the x-rays are absorbed in 20.0 kg of tissue, and the exposure time is 0.250 s.
After it is pushed very slowly over the edge, it starts to roll down. At the bottom it hits another cart originally at rest with a mass of m2 = 19.3 t. The bumper mechanism locks the two carts together. What is the final common speed of the two c..
Drivers must slow from 70 mph to 40 mph to negotiate a severe curve on a rural highway. A warning sign for the curve is visible for 100 ft. How far in advance of the curve is it necessary to post the sign to insure that vehicles are able to proper..
Suppose that the coefficient of kinetic friction between Zak's feet and the floor, while wearing socks, is 0.250. what distance will he slide before stopping
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