Alocation gets its drinking water from wells drilled into the earth. the people in the location have reported that their drinking water has a foul smell since a few days. a student investigates the cause of the foul smell in the drinking water and concludes that a gasoline spill about a year ago has caused the contamination in groundwater. why is the student's conclusion most likely invalid? a. it is based on information obtained from a secondary source b. there is no published information about gasoline spills in the locality c. it is biased against gas companies which may not always cause gasoline spills d. there is a large time gap between the gasoline spill and contamination of water

An object is located 30.0 cm from a concave mirror. the focal length is 15.0 c,. what is the image distance? a. 30.0 cm b. -10 cm c. 10.0 cm d. -30.0 cm

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?