Which requires more work on the brakes of a car?
A) slowing down from 100 km/h to 70 km/h
B) slowing down from 70 km/h to a stop
C) equal amounts of work for either
Answer: A
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Much research has taken place on the value of diversity of organisms in a given plot of land. What appears to be the value of such diversity?
What will be an ideal response?
The signature of a planet is largest in radial velocity measurements when the planet and star are lined up along the line of sight to the telescope
Indicate whether the statement is true or false
What produces the blueish haze in the middle of the Crab Nebula?
A.) It is primarily from emission lines of oxygen. B.) It is produced by smashing streams of gas. C.) It is produced by accelerated electrons. D.) It is a condensing Hydrogen cloud. E.) We don't know.
In a two-body collision, if the momentum of the system is conserved, then which of the following best describes the kinetic energy after the collision?
a. must be less b. must also be conserved c. may also be conserved d. is doubled in value