A 60. kg person walks along a 100. kg log at the rate of 0.8 m/s (with respect to the log). With what speed does the log move, with respect to the shore?
What will be an ideal response?
0.3 m/s
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__________ in Earth's atmosphere absorbs most microwave and infrared radiation coming from outside Earth's atmosphere
a. Ozone b. Water vapor c. Methane d. Carbon dioxide
Projectile Motion: The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. If there is no air resistance, how long does it take the football to reach the top of its trajectory?
A. 1.0 s B. 2.0 s C. 3.0 s D. 4.0 s E. 5.0 s
Energy Conservation With Conservative Forces: A bead is moving with a speed of 20 m/s at position A on the track shown in the figure. This track is friction-free, and there is no appreciable air resistance. What is the speed of the bead at point C?
A. 0 m/s B. 34 m/s C. 69 m/s D. 20 m/s E. We cannot solve this problem without knowing the mass of the bead.
We are unlikely to find fossil evidence of life from more than 3.5 billion years ago because there is no way life existed before then
Indicate whether the statement is true or false