Current geological evidence suggests that life
A) took billions of years to appear
B) appeared as soon as the Earth formed
C) appeared quite early in Earth's history
D) appeared relatively recently in Earth's history
C
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Galileo is credited with designing the first reflector telescope
Indicate whether the statement is true or false
How do we specify the location of a star on the celestial sphere?
Friction: 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
Which energy is an energy of position?
(a) kinetic (b) heat (c) potential (d) force x time (e) watts