Find the minimum diameter of a steel wire 18 m long that will stretch no more than 9 mm when a load of 380 kg is hung on the lower end. (Y steel = 2.0 × 10^11 N/m2)
6.89 mm
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The angular resolution of the eye is about 5 × 10-4 rad. The Moon is about 400,000 km from the earth and has a diameter of about 3500 km. What is the smallest feature on the Moon that can be resolved with the unaided eye?
A) 400 km B) 1000 km C) 100 km D) 1.8 km E) 200 km
Assuming that our ideas about how "hot Jupiters" ended up on their current orbits are correct, why didn't our own solar system end up with any hot Jupiters?
A) Our solar nebula must have been blown into space shortly after the formation of the jovian planets. B) Our jovian planets must have migrated outward from inside the orbit of Mercury. C) Our solar nebula must have stuck around for an unusually long time after the formation of jovian planets. D) The existence of Earth and the other terrestrial planets prevented the jovian planets from migrating inward.
Water is flowing through a pipe whose cross-sectional area at point A is larger than the cross-sectional area at point B. The reading on a pressure gauge connected to the pipe at point A will be lower than the reading on a pressure gauge connected to the pipe at point B
a. True b. False Indicate whether the statement is true or false
The particle that orbits the central core inside an atom is
a. the electron. b. the proton. c. the neutron. d. the nucleus. e. none of the above.