PHYSICS HIGH SCHOOL

Holden is trying to determine the velocity of his race car. He went 20 meters east, turned around, and went 40 meters west. He turned the car one more time and went 35 meters east. His car was 15 meters from the starting line. This took 5 seconds.What is the car’s velocity?
A. 3 m/s west

B.3 m/s east

C. 19 m/s west

D. 19 m/s east

Answers

Answer 1
Answer: Although the car's average speed is  19 m/s ,
its velocity is  3 m/s east.

Velocity is        (displacement) / (time)

and Displacement is the distance between the start point and
end point, no matter what route was traveled between them. 

In this case, the displacement is 15 meters east.
So the velocity is

               (15 meters east) / (5 sec) = 3 meters/sec east .
Answer 2
Answer:

Answer:

i dont know what he said but i think C

Explanation:

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The word “cumulative” means that something builds on itself. Which example best shows how scientific knowledge is cumulative?A) Watson and Crick worked together to come up with the model of DNA.
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Answers

Answer: The correct answer is B.  

Explanation:

"Cumulative" means that something builds on itself. Like one law is formulated from using the result of the other.

Newton's law of gravity had come after that Kepler's laws was formulated.

The law of gravity is more fundamental than Kepler's laws.

Newton formulated his famous law of gravitation between the earth and the moon and also between the Sun and the planet.

After that Kepler's laws came. He gave the law of orbit in which he said that the planet revolves the Sun in an eliiptical orbit. And the other two laws were also given by him.  In this way Kepler's law was formulated by using the law of gravity.

Therefore, Kepler based his laws of planetary motions off of Newton’s law of gravity is the best example to show how scientific knowledge is cumulative.

Kepler based his laws of planetary motions off of Newton’s law of gravity.

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Answers

The Ampere is the SI unit of electric current. This unit is often shortened to "amp" and is abbreviated "A" when placed at the end of a measurement. The name Ampere comes from André-Marie Ampère, and is equal to the flow of one coulomb per second.

Final answer:

An ampere is the SI unit for electric current, not for electric power, resistance or electric potential difference. Other units are used for these concepts, such as watts, ohms, and volts respectively.

Explanation:

An ampere is the standard unit of measurement in the International System of Units (SI) for the quantity of electric current. It is not used as the unit for electric power, resistance or electric potential difference. For instance, electric power is measured in watts, resistance is measured in ohms, and electric potential difference is measured in volts.

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A graph of the motion of a pendulum shows that it swings from +5 centimeters to -5 centimeters for each cycle. What is the amplitude of the pendulum?

Answers

The amplitude of the pendulum is 5cm.

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Amplitude is the maximum displacement of the wave from its mean position upwards or downwards.

As the graph of the motion of pendulum swings from +5cm to -5cm for each cycle, the magnitude of peak amplitude of the pendulum is 5 centimeters.

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the peak amplitude of the pendulum is 5 centimeters, the peak to peak amplitude of the pendulum is 10 centimeters.

in this case, i think peak to peak amplitude makes more sense

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Answers

On average, the ocean is 2.3 miles deep. Hope this helps!

Answer:

The average depth of the ocean is about 12,100 feet.

Explanation:
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