Nitrogen gas, ch4, flowing in a 5-cm-diameter pipe at 15°c and 200 kpa, at the rate of 0.05 kg/s, encounters a partially closed valve. if there is a pressure drop of 30 kpa across the valve and essentially no temperature change, what are the velocities upstream and downstream of the valve?

Classify each possible hypothesis about a medicinal aloe vera plant as falsifiable or non-falsifiable. aloe vera gel is the best natural skin moisturizer. aloe vera gel can heal wounds by boosting cell renewal. aloe vera juice tastes better than carrot juice. drinking aloe juice can reduce the risk of lung cancer.

If steel is more dense that lake water, why can a boat float

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.