Jason takes off across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible)
The skis produce a forward thrust of 200 N and have a coefficient of kinetic friction with water of 0.10. Unfortunately, the skis run out of fuel after only 90 s. What is Jason's top speed?
A) 150 m/s
B) 240 m/s
C) 24 m/s
D) 90 m/s
A
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When you place a stick in water and remove it, the stick is wet. If you instead place it in mercury the opposite occurs. The stick is dry. This is because adhesive forces are greater
A) between stick and water. B) between the stick and mercury. C) between the mercury and the water. D) none of the above
__________ is transferred from a substance if it is exposed to something that has a lower temperature
Fill in the blank(s) with correct word
Atmospheric refraction makes the daylight hours
A) longer. B) shorter. C) neither
Why are several observations or trials taken for each measurement?