A2-kg bowling ball is 1 meter off the ground on a post when it falls. just before it reaches the ground, it is traveling 4.4 m/s. assuming that there is no air resistance, which statement is true?
a. the mechanical energy is not conserved.
b. the mechanical energy is conserved.
c. the intial potential energy is greater than the final kinetic energy.
d. the initial potential energy is less than the final kinetic energy.
Solved
Show answers
More tips
- F Food and Cooking How to Make Polendwitsa at Home?...
- F Family and Home Parents or Environment: Who Has the Most Influence on a Child s Upbringing?...
- P Philosophy Unbelievable stories of encounters with otherworldly forces...
- L Leisure and Entertainment How to Choose the Perfect Gift for Men on February 23rd?...
- H Health and Medicine How to Treat Whooping Cough in Children?...
- H Health and Medicine Simple Ways to Lower Cholesterol in the Blood: Tips and Tricks...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
- S Style and Beauty Intimate Haircut: The Reasons, Popularity, and Risks...
- A Art and Culture When Will Eurovision 2011 Take Place?...
Answers on questions: Physics
- P Physics Because of which of the following can you see different colors?...
- P Physics All of the following have been accomplished by space programs except- A. placing semi-permanent structures in earth’s orbit B. landing spacecraft on planets other than our own C. sending...
- P Physics Can someone help? thx...
- P Physics a current of 0.2 flows through a component with a resistance of 40 ohms. Calculate the potential difference...
- P Physics Calculate the answer to the correct number of significant digits. 105 + 62.4...
- P Physics The Drake Equation The Drake Equation Provides an estimate of how many planets there are in the Solar System that may harbor technically communicative life-forms. Provides an estimate...
- H History How did the yuan dynasty contribute to the rebellion that eventually overthrew the dynasty...
- M Mathematics Write the formula for the volume v of a prism where b is the area of the base and h is the height. v=36 h=6...
- M Mathematics Ineed ! 300 has how many 2/3 s in it?...
- G Geography How is co2 related to the greenhouse effect? ?...
Ответ:
1) Initially the ball is at rest 1 m over the ground, then its mechanical energy is only potential energy = m*g*h = 2kg * 9.8m/s^2 * 1m = 19.6 joule
2) When the ball is above to hit the ground, its mechanical energy is only kinetic energy = [1/2]m*v^2 = [1/2]2kg*(4.4m/s)^2 = 19.4 joule
Those results, taken into account that the measures have some errors (for example the exact velocity of the ball when it reaches de floor is quite difficult to measure) confirm the conservation of the energy.
Then, the answer is the option B. The mechanical energy is conserved
Ответ:
A 12V battery produces more current than a 1.5V battery produces,
through the same device, because the potential difference between
the terminals of the 12V battery is 8 times the potential difference
between the terminals of the 1.5V battery.
Of the choices offered, choice 'C' is the closest. But it should say
"electrical potential", NOT "potential energy".