A football game customarily begins with a coin toss to determine who kicks off. The referee tosses the coin up with an initial s
1 answer:
Answer:
The coin travels 1.8348 meters above its point of release.
Explanation:
Initial speed = 6 m/s (Assumed vertical speed as not stated in question)
Final Speed = 0 m/s (at the highest point in air)
Acceleration due to gravity = -9.81 m/s^2
Equation of motion used:
s = 1.8348 m
Thus, the coin will travel 1.8348 meters up to its highest point in the air.
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We can confirm that the difference between a comet and an asteroid lies in their compositions and physical characteristics <u>derived from those compositions</u>.
As stated in the question, the main difference between an asteroid and a comet is their compositions, meaning the materials from which they form.
Asteroids are rocky objects which a heavy metal composition, while comets tend to be made of dust, ice, and <em><u>some </u></em>rocky material. Some extra differences include:
- Comets reflect a steady amount of light (because of their ice composition)
- Asteroids will <em><u>reflect light at random intervals due to some metals that may be present on their surface</u></em>
- Comets tend to have a tail made of water from the melting ice when reflecting sunlight.
Therefore, we can confirm that the main difference between asteroids and comets is their compositions, which lead to distinct physical characteristics.
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A) Calling F the intensity of the horizontal force and d the displacement of the block across the floor, the work done by the horizontal force is equal to
b) The work done by the frictional force against the motion of the block is equal to:
Part of these 105.1 Joules of work becomes increase of thermal energy of the block (
), and part of it becomes increase of thermal energy of the floor (
). We already know the increase in thermal energy of the block (38.2 J), so we can find the increase in thermal energy of the floor:
c) The net work done on the block is the work done by the horizontal force F minus the work done by the frictional force (the frictional force acts against the motion, so we must take it with a negative sign):
For the work-energy theorem, the work done on the block is equal to its increase of kinetic energy:
So, we have
b) The work done by the frictional force against the motion of the block is equal to:
Part of these 105.1 Joules of work becomes increase of thermal energy of the block (
c) The net work done on the block is the work done by the horizontal force F minus the work done by the frictional force (the frictional force acts against the motion, so we must take it with a negative sign):
For the work-energy theorem, the work done on the block is equal to its increase of kinetic energy:
So, we have