Ten Great US Public Health Achievements
What will be an ideal response?
Vaccinations
Safer workplace
Safer and healthier food
Motor vehicle safety
Control of infectious diseases
Decline in deaths from coronary heart disease and stroke
Family planning
Recognition of tobacco use as a health hazard
Healthier mothers and babies
Fluoridation of drinking water
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A positive test charge q is released near a positive fixed charge Q. As q moves away from Q, it will move with
A) constant velocity. B) constant acceleration. C) increasing acceleration. D) decreasing acceleration.
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 2.0 cm from the center of the two surfaces?
a. 1.1 N/C b. 4.5 N/C c. 1.4 N/C d. 5.6 N/C e. 0.50 N/C
Why are volcanoes so large on Venus and on Mars?
What will be an ideal response?
The figure shows two wires that are tied to a 710 g mass that revolves in a horizontal circle at a constant speed of 7.5 m/s. What is the tension in the upper wire?
A) 34 N B) 20 N C) 27 N D) 41 N