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Bad habits. According to the National Household Survey on Drug Abuse, 40.4% of adolescents aged 12 to 17 years used alcohol in 2006, 17.3% used marijuana, 2.2% used cocaine, and 25.8% used cigarettes. Explain why it is not correct to display these data in a pie chart.
A person typically contains 5.0 L of blood of density 1.05 g/ml When at rest, it normally takes 1.0 mint to pump all this blood through the body. What average power does the heart expend in the process
A 17.0-lb block rests on the floor. What force does the floor exert on the block, what is the force exerted by the floor on the 17.0-lb block
If the coefficient of volume expansion of mercury is βHg = 1.80×10-4 /K , compute βglass, the coefficient of volume expansion of the glass. Express your answer in inverse kelvins.
The plates of a 3.1 nF parallel-plate capacitor are each 0.27 m^2 in area. If the plates are separated by a Teflon sheet, how thick is the sheet
Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of -0.6020 N when separated by 50 cm, center-to-center.
A student constructs an astronomical telescope with a magnification of 10. what is the resulting length of the telescope
A wire (length = 2.0 m, diameter = 1.0 mm) has a resistance of 0.45ohm. What is the resistivity of the material used
A 24-kg boy stands 5 m from the center of a frictionless playground merry-go-round, Calculate the speed of the boy relative to the surface of the merry-go-round
A rigid conducting loop has the shape of an equilateral triangle with sides a = 42 cm. Each side of the loop has aresistance of R = 3 W. Anexternal torque forces the loop to rotate at constant speed at anangular rate of 7 cycles per second about i..
A supertrain of proper length 200 m travels at a speed of 0.9 times the speed of light (relative to the tunnel) as it passes through a tunnel having proper length 80 m. how much longer is the train than the tunnel
Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 3.8 x 1028 kg and 1.3 x 103 m. Find the density of such a star
a block of mass 2.10 kg is pushed 2.24 m along a frictionless horizontal table by a constant 19.0 n force directed
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