How can we run out of energy if energy cannot be created or destroyed?

Answers

Answer 1

Answer: Excellent question !
When people say "run out of energy", what they really mean is: run out of the easiest substances to get energy FROM ... coal, oil, and wood.

Answer 2

Answer: you don't run out of energy, you run out of USABLE energy. That may or may not happen, if humans somehow manage to become a type two civilization, it's almost never happening, because if a civilization becomes type two, they can harvest all of the energy produced by their sun. And if the human civilization becomes a type two, they're going to become type 3 well before the sun runs out of gases. If we become a type 3, we can use all energy from every part of the universe.

A or B

Explanation:

The autonomic nervous system has two components, the sympathetic nervous system and the parasympathetic nervous system. The sympathetic nervous system functions like a gas pedal in a car. It triggers the fight-or-flight response, providing the body with a burst of energy so that it can respond to perceived dangers.

Final answer:

The fight-or-flight response is a physiological reaction triggered by a perceived threat or danger. It prepares the body for action by releasing stress hormones and increasing heart rate. This response helps individuals to either fight the threat or flee from it.

Explanation:

The fight-or-flight response is a physiological reaction that occurs in response to a perceived threat or danger. When triggered, the body releases stress hormones like adrenaline and cortisol, which prepare the body for action.

This response can help increase heart rate, dilated pupils, and redirect blood flow to the muscles, enabling the individual to either fight the threat or flee from it.

Learn more about Fight-or-flight response here:

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Walking across a carpet is an example of charge being transferred bya. contact.
b. induction.
c. static electricity.
d. friction.

Answers

Answer : The correct answer is- D) Friction.

There are three modes of charging, which are Conduction, induction, and friction.

The static electricity is produced due to the rubbing of one substance with another. This is called charing by friction.

Hence, the correct answer is friction as there is friction between carpet and the feet of person walking over it.

Walking across a carpet is an example of charge being transferred by friction. The answer is letter D. The carpet, which is at rest, will resist the motion cause by your walking. This resistive motion d the friction the carpet obtained from you and you from the carpet.

During a race, a sprinter increases from 5.0 m/s to 7.5 m/s over a period of 1.25s. What is the sprinter’s average acceleration during this period?

Answers

Answer:

$\boxed {\boxed {\sf 2 \ m/s^2}}$

Explanation:

Acceleration can be found by dividing the change in velocity by the time.

$a=(\Delta v)/(t)$

The time is 1.25 seconds. The change in velocity is the difference between the initial velocity and the final velocity.

$\Delta v=v_f-v_i$
The final velocity is 7.5 m/s and the initial velocity is 5.0 m/s
$\Delta v =7.5 \ m/s-5.0 \ m/s=2.5 \ m/s$

$\Delta v= 2.5 \ m/s\nt=1.25 \ s$

Substitute the values into the formula.

$a=(2.5 \ m/s)/(1.25 \ s)$

Divide.

$a=2 \ m/s^2$

The sprinter's average acceleration is 2 meters per second squared.

Answer: 2 m/s^2

Explanation: Hope this helps :)

Lara has noticed that all of her friends are very careful about what they eat, and they are all much thinner than she is. She wants to be healthy, but she really wants to fit in with her friends. What is the best step for Lara to take?A. Talk to a trusted adult to help her evaluate her eating and exercise in a healthy way.
B.Ask her friends how they stay so thin, and use the same strategies.
C. Find new friends who are not as thin so she doesn't feel any pressure.
D.Try out the newest diet she's seen advertised on TV to help her lose the weight she wants to lose.

Answers

Answer: Option (A) is the correct answer.

Explanation:

If Lara wants to be healthy, and really wants to fit in with her friends then she should talk to a trusted adult to help her evaluate her eating and exercise in a healthy way.

This is because a trusted person will give her beneficial advice as compared to any other person or any advertisement on TV which may promise false results in order to sell their product.

This may also lead to harmful effects on her health. Thus, she should eat and exercise in a healthy way.

A. Talk to a trusted adult to help her evaluate her eating and exercise in a healthy way.

In the qualifying round of the 50-yd freestyle in the sectional swimming championship, Dugan got an early lead by finishing the first 25.00 yd in 10.01 seconds. Dugan finished the return leg (25.00 yd distance) in 10.22 seconds. Determine Dugan's average velocity for the entire race. Number only, round to the nearest hundredth.

Answers

Answer:

v = 0

Explanation:

Given that,

Total distance is 50 yards

Dugan got an early lead by finishing the first 25.00 yd in 10.01 seconds

Dugan finished the return leg (25.00 yd distance) in 10.22 seconds.

We need to find Dugan's average velocity for the entire race. As he returns at the initial position. As a result, the net displacement is equal to 0. So,

Average velocity = net displacement/time

v = 0

Hence, his average velocity for the entire race is 0.

Final answer:

Dugan's average velocity for the entire 50 yd race is 2.47 yd/sec, calculated by dividing the total distance (50 yd) by the total time (20.23 sec).

Explanation:

The first step involved is to calculate the total distance that Dugan had covered. In this case, he swam 25 yd twice, making the total distance 50 yd.

Next, we need to find the total time it took Dugan to swim the entire distance. We add the time of the first leg, which is 10.01 seconds, to the time of the return leg, which is 10.22 seconds, providing a total time of 20.23 seconds.

The average velocity is defined as the total distance divided by the total time. So, for Dugan, it would be 50 yd divided by 20.23 sec, which equals 2.47 yd/sec (rounding to the nearest hundredth).