What is the average speed of a cheetah that runs 70m in 2.5 seconds?

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Answer 1

Answer: $70m\ in\ 2.5\ seconds\n V=(s)/(t)\n V=(70m)/(2.5s)\n V=28(m)/(s)$

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Atoms become charged by gaining or losing _____. electrons protons neutrons

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Electrons

It's not neutrons because neutrons don't have a charge (they're not positive or negative). They don't make a difference in the charge of an atom.

It's not protons because atoms don't lose or gain protons. They stay in the nucleus.

Electrons, however, are not in the nucleus. They fly crazy fast around the nucleus and can sometimes get sucked in by the nucleus of another atom. Electrons are also negatively charged. Gaining electrons makes an atom negatively charged. Losing electrons makes an atom positively charged.

Carol can be defined as a social drinker because she can easily limit drinking and she chiefly drinks alcohol when she is out with friends or family members. True or False?

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True. These are the characteristics of a social drinker.

It is true, just took the test

What is the velocity of the dart just before the collision?

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Answer: 1.38 m/s to the right.

Explanation: We can solve this problem using the principle of conservation of momentum. The momentum of an object is defined as the product of its mass and velocity, and the total momentum of a closed system is conserved, meaning that the total momentum before a collision is equal to the total momentum after the collision.Let the initial velocity of the dart be v, and let the final velocity of the dart and the block be vf. The momentum of the dart before the collision is given by p = mv, where m is the mass of the dart. The momentum of the dart and block after the collision is given by (m + M)vf, where M is the mass of the block.Using the principle of conservation of momentum, we have:p = (m + M)vfSubstituting the given values, we get:0.012 kg v = (0.012 kg + 0.2 kg) 0.78 m/sSimplifying, we get:v = (0.212 kg) (0.78 m/s) / 0.012 kgv ≈ 1.38 m/sTherefore, the velocity of the dart just before it hits the block is approximately 1.38 m/s to the right.

Assume that all four H-R diagrams below represent a star in different stages of its life, after it starts to fuse hydrogen in its core. Rank the HR diagrams based on when each stage occurs, from first to last.

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Answer and explanation;

-The diagram at the left represents the Sun (or any other one-solar-mass star) as a hydrogen-burning main-sequence star, with spectral type G and one solar luminosity. The next diagram shows the Sun after it has exhausted its core hydrogen and left the main sequence, making it a sub-giant with energy generated by hydrogen burning in a shell around an inert helium core.

-The third diagram shows the Sun a little later; its energy source is still hydrogen shell burning, but at this point it has expanded in size so much that it is a red giant. The final diagram (far right) shows the white dwarf corpse of a one-solar-mass star; it is hot because it is the exposed core of the dead star, but dim because it is small in size.

The right answer for the question that is being asked and shown above is that: "1-4-3-2." (main sequence-->red giant-->supergiant-->white dwarf). Assume that all four H-R diagrams below represent a star in different stages of its life, after it starts to fuse hydrogen in its core.

What do volcanoes look like inside?

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Have lava inside boiling hot if not just probably look like a crater.

they have a huge vertical pipe in the center going down. while going down, there are branches extending outwards. think of it as a tree. those branches are way thinner than the pipe in the middle. Those branches don't always reach the surface though...

Why do you think sound travels faster in steel than it does in wood? (Hint: Think about the densities of the two materials, and how the particles might be arranged.)

Answers

Answer:

If sound waves of the same energy were passed through a block of wood and a block of steel, which is more dense than the wood, the molecules of the steel would vibrate at a slower rate. Sound moves faster through denser air because the molecules are closer together in dense air and sound can be more easily passed on.

Explanation:

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Kira jogs to a store 72 miles away in a time of 36 seconds. What is Kira's average speed?

In the study that the FBI did on examining the physical characteristics of hair, what percentage of the “matches” were not really matches at all?

If you double the distance between two objects, the electric force is _____.A. one half as strong B. doubled C. one fourth as strong D. quadrupled