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Ostrovityanka [42]
3 years ago
11

George walks to a friend's house. He walks 750 meters North, then realizes he walked too far. He turns around and walks 250 mete

rs South. The entire walk takes him 13 seconds. What is his speed per second to the first decimal point?
Physics
1 answer:
Genrish500 [490]3 years ago
8 0

Answer:

76.9 m/s

Explanation:

total distance travelled is 750m + 250m = 1000m

the total time taken is 13 seconds.

1000m/13s = 76.9 m/s (1dp)

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A heavy frog and a light frog jump straight up into the air. They push off in such away that they both have the same kinetic ene
Ilia_Sergeevich [38]

Answer:

The lighter frog goes higher than the heavier frog.

The lighter frog is moving faster than the heavier frog

Explanation:

If both frogs have the same kinetic energy when they leave the ground, the following equality applies:

K(light) = K(heavy) = \frac{1}{2} *ml*vol^{2} = \frac{1}{2}*mh*voh^{2}

Now, if the only force acting on the frogs is gravity, when they reach to the maximum height, we can apply the following kinematic equation:

vf^{2} -vo^{2} = 2*a*hmax = vf^{2} -vo^{2} = 2*(-g)*hmax

When h= hmax, the object comes momentarily to an stop, so vf =0

Solving for hmax:

hmax =\frac{vo^{2} }{2*g}

As the lighter frog, in order to have the same kinetic energy than the heavier one, has a greater initial velocity, it will go higher than the other.

As a consequence of both having the same kinetic energy, the lighter frog will be moving faster than the heavier frog.

5 0
3 years ago
Which of the following is least likely to be a scientific experiment?
nikitadnepr [17]
D should be the answer
3 0
3 years ago
A generator contains a coil that spins to produce an electric current. How is energy transformed by using a generator
LiRa [457]

<u>Answer </u>

Mechanical energy ⇒ Electric energy

<u>Explanation </u>

A generator is used to produce electric energy. When he coils are made to rotate/spin, is makes the mechanical part. This coils rotates inside a magnetic fields inducing current in the coils. When current starts flowing in the coils, it forms the electrical part.

So, on the generator the energy changes are from mechanical to electrical energy.



7 0
3 years ago
A helpful tool for keeping data organized during an experiment is a ???. *
Margarita [4]

Answer:

data table

Explanation:

hope this helps

4 0
3 years ago
Endothermic reactions give off heat as they proceed. <br> a. True<br> b. False
Temka [501]
B. False
Endothermic reactions absorb heat.
5 0
3 years ago
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