A boat with mass of 1 200 kg is traveling at 12 m/s. What is the magnitude of the force required to stop the boat if it undergoes a displacement of 85 m?
a. 2 000 N
b. 170 N
c. 8 500 N
d. 1 000 N
d
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What can we learn about a star from a life track on an H-R diagram?
A) the star's age B) the surface temperature and luminosity the star will have at each stage of its life C) the star's current stage of life D) how the star's distance from Earth varies at different times in its life
Ralph walks 3 m to the left in 2 seconds, then 4 m to the right in 3 seconds. Next, he stops for 3 seconds, and finally walks 5 m to the left in 4 seconds
The distance Ralph travels is closest to:
1.0 m 2.2 m 3.4 m 4.6 m 5.8 m 6.10 m 7.12 m 8.14 m 9.The negative of one of the choices above 10.Impossible to determineAll the following statements are true. Which one explains why convection can occur in the troposphere but not in the stratosphere?
A) Atmospheric pressure is much greater in the troposphere than in the stratosphere. B) The stratosphere contains significant amounts of ozone but the troposphere does not. C) Temperature declines with altitude in the troposphere but increases with altitude in the stratosphere. D) Clouds tend to form in the troposphere but not the stratosphere.
A sound with a frequency of 15 Hz is in the ______________ region of the sound spectrum
Fill in the blank(s) with correct word