For typical rubber-on-concrete friction, what is the shortest time in which a car could accelerate from 0 to 70 mph? suppose tha
1 answer:
The shortest time in which a car could accelerate from 0 to 70 mph is 3.193 seconds.
To find the answer, we have to know more about the friction.
<h3>How to find the shortest time?</h3>- We have the expression for final velocity as,
- It is given in the question that,
- It is given that; the car could accelerate from 0 to 70mph. Thus, acceleration will be,
- Thus, the shortest time will be,
Thus, we can conclude that, the shortest time in which a car could accelerate from 0 to 70 mph is 3.193 seconds.
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Answer:
The electric force between them if the pieces of grain are 2 cm apart is .
Explanation:
Given:
Charge on one grain,
Charge on another grain,
Separation between them,
Electric force acting between two charges separated by a distance
is given as:
Where, is Coulomb's constant equal to
.
Now, plug in all the values and solve for .
Therefore, the electric force between them if the pieces of grain are 2 cm apart is .
Answer:
Surely Achilles will catch the Tortoise, in 400 seconds
Explanation:
The problem itself reduces the interval of time many times, almost reaching zero. However, if we assume the interval constant, then it is clear that in two hours Achilles already has surpassed the Tortoise (20 miles while the Tortoise only 3).
To calculate the time, we use kinematic expression for constant speed:
The moment that Achilles catch the tortoise is found by setting the same final position for both (and same time as well, since both start at the same time):
The lists from greatest to lowest change in velocity.Dustin → Diego → Kira. Option A is correct.
<h3 /><h3>What is acceleration?</h3>The rate of change of velocity with respect to time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.
The acceleration is obtained one by one from the given data as the ratio of the velocity to the time.
For the acceleration of each, you can refer to the excel table attached below.
The velocity changes are listed from largest to least. Dustin and Diego Kira.
Hence, option A is the right answer.
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