PHYSICS MIDDLE SCHOOL

which phenomenon is most directly responsible for earth’s magnetic field? Earth spinning on its axis. The moon's gravitational pull on earth? Earth's revolution around the sun? The moon's revolution around earth?

Answers

Answer 1
Answer: Earth spinning on its axis

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in ancient Greece each city-state or polis had its on form of______ and was independent of the other city-states or ______.

Answers

In ancient Greece each city-state or polis had its own form of government and was independent of the other city-states or polis


I hope that's help !

Which form of energy is observed when an athlete runs

Answers

The answer is kinetic energy because kinetics refers to the movement of the particular motion.
I am supporting the answer that Benny had just given you. 

Bone-strengthening physical activity done _____ increases bone-mineral content and bone density in youth.

Answers

Hi!

The answer would be three days a week

Explanation

Bone-strengthening activity is key to ensuring that bones remain healthy to maintain an individual's lifestyle. The physical activity to strengthen bone may be brisk walking, exercises that include weights, or gymnastics to lift a few. The purpose of these activities are to observed to contribute to an increase in the bone mineral density of adolescents and children. Several studies have established that about 150 minutes a week for adults, or 3 days a week (60 minutes a day) for the youth should be devoted to bone strengthening physical activity to ensure good health of the body.


Hope this helps!

Answer:

three or more days a week

Explanation:

Common units of measurement for speed.

Answers

miles per hour (mph or miles/h), kilometers per hour (km/h), or meters per second (m/s).
Miles, kilometers, meters

A cart is set up as shown below, with three fans directed to the left and two of the fans running. The motion of the cart is represented by the v vs t graph shown. If the experiment were repeated with all three fans running, what might the resulting v vs t graph look like?

Answers

The force of 3 fans would be grater than the force of 2 fans. 
So the cart would have greater acceleration to the right, and
it would reach a greater speed to the right.  The resulting
'v' vs 't' graph would have a greater positive slope, and would
be higher at any given time.

You might get a better answer if you let us actually SEE the
picture and the graph.

 The resulting  

'v' vs 't' graph would have a greater positive slope, and would  

be higher at any given time.

An isotope of carbon has 6 protons and 8 neutrons.How is this isotope written symbolically?

A. C-2
B. C-6
C. C-8
D. C-14

Answers

The answer is D. C-14.
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Because the moon rotates once for each revolution around Earth,a. you see some phases more than others. b. a different side of the moon faces Earth each day.c. you never see the far side of the moon from Earth.d. the far side of the moon is visible only during the full moon phase.
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You must exert a force of 4.5 N on a book to slide it across a table. If you do 2.7J of work in the process, how far have you moved the book?