Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions
Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30° above the horizontal. Which of the following statements are true about just before the snowballs reach the ground below? (There could be more than one correct choice.) A) Debra's snowball will stay in the air longer than Mary's snowball.
B) Mary's snowball will stay in the air longer than Debra's snowball.
C) Both snowballs will take the same amount of time to hit the ground.
D) Debra's snowball has exactly the same acceleration as Mary's snowball.
E) Mary's snowball has a greater downward acceleration than Debra's snowball.
A, D
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A) metals B) rocks C) hydrogen and helium gases D) hydrogen compounds like water, methane, and ammonia
Describe how Eratosthenes first measured the size of Earth over 2000 years ago
What will be an ideal response?
Which best describes the property of surface tension in the examples pictured here?
a. Neighboring molecules of the liquid bond to each other, forming a flexible atomic sheet at the surface. b. Molecules at the surface have different properties than atoms surrounded on all sides by other atoms. c. At a surface, the interaction between air molecules and the fluid create the surface tension. d. The surface tension pulls molecules out from the center of a liquid to the surface. e. The surface tension only occurs at high temperatures.
Which of the following is not true about cold-work?
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