Which of the following statements expresses what we mean by a scientific theory? A.) An educated guess.B.) A simple model that explains a wide variety of phenomena and that has survived repeated tests.
C.) An explanation for a physical phenomenon, an explanation that hasn't been tested yet.

Answers

Answer 1

Answer: C. Because a theory isnt proven until theres facts to follow it up.

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What temperature is required to transfer waste heat to the environment for a heat engine to be 100% efficient?

Answers

It is not possible for a heat engine to be 100% efficient. The Laws of Thermodynamics explicitly explains that you can never transfer heat perfectly simply because during the flow of heat (either at low or high temperature) some of the initial input heat have been transformed into work.

The momentum of a bald eagle in flight is calculated to be 345. The mass of the eagle is 5.0 kg. What is the magnitude of the velocity of the eagle?

Answers

Answer : v = 69 m/s.

Explanation :

It is given that,

The momentum of a bald eagle in flight, $p = 345\ Kgm/s$

Mass of the eagle, m = 5 kg

We know that the momentum of any object is defined as the product of mass and the velocity with which it is moving.

$p=mv$

$v=(p)/(m)$

$v=(345\ kgm/s)/(5\ kg)$

$v=69\ m/s$

The velocity of the eagle is 69 m/s.

Hence, this is the required solution.

The formula to find the magnitude of velocity is:

▲v= ▲M/m

▲v=Velocity Change
▲M=Momentum Change
m=Mass

Plug in the information;

▲v=345/5

The answer is 69

Scientists use models to A) increase the duration of a volcanic eruption
B) change the location of a volcanic eruption
C) predict the damages due to an earthquake
D) stop the occurrence of tsunamis due to an earthquake

Answers

D Is Thw Correct answer

What part of the body is damaged by a sprain?A) Ligament
B) Bone
C) Muscle
D) Tendon

Answers

the ligament is damaged when a sprain

the ligament would be damaged

What does it mean mechanical advange is less than one?

Answers

Answer:

this happens when the input force is greater than the output force

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me·chan·i·cal ad·van·tage
noun
the ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine.

Which of the items has the least inertia while at rest? A. penny. B. airplane. C. frog. D. dog.