A worker on top of a radar tower 80 m high drops a wrench off the tower. The speed of the wrench when it hits the ground is ____________
Fill in the blank(s) with correct word
39.6 m/s
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In 2005, researcher Woo-suk Hwang reported that he had made immortal stem cells from human patients. His research was hailed as a breakthrough for people affected by degenerative diseases, because stem cells may be used to repair a person's own damaged tissues. Hwang published his results in a peer-reviewed journal. In 2006, the journal retracted his paper after other scientists discovered that
Hwang's group had faked their data. Does the incident show that results of scientific studies cannot be trusted? Or does it confirm the usefulness of a scientific approach, because other scientists discovered and exposed the fraud? What will be an ideal response?
A planet has mass M = 8.00 × 10^23 kg. At what distance will the centripetal acceleration of an orbiting space station be equal to the gravitational acceleration on Earth's surface? (G = 6.67 × 10^–11 m3·kg–1·s–1)
a. 2.33 × 10^6 m b. 5.44 × 10^12 m c. 5.23 × 10^14 m d. 1.18 × 10^35 m
A uniform rod (length = 2.0 m) is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through the rod at a point 0.50 m from one end of the rod. If the rod is released from rest in a horizontal position, what is the angular speed of the rod as it rotates through its lowest position?
a. 3.5 rad/s b. 3.8 rad/s c. 4.1 rad/s d. 2.0 rad/s e. 5.6 rad/s
Now that we know there is dark energy in the universe, what will be the fate of the universe?
A) it will continue to expand at exactly the same rate as it is now. B) the universe will definitely contract again eventually, because we know dark energy will decay away over time. C) it will suddenly disappear D) the universe will continue to expand forever because we know dark energy will last forever. E) we don't know yet the fate of the universe; it may continue to expand forever or it may contract again.