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hammer [34]
3 years ago
12

1: A man standing on the South Pole of the Earth drops a ball. Mike thinks that the ball will move away from the Earth and Maria

thinks that the ball will move toward the Earth.
​
2. Who do your agree with?

3. Who do you disagree with?

What could you say to that person to convince them that their idea is not correct?

(Science Test)
Physics
1 answer:
postnew [5]3 years ago
6 0
I agree with Maria and disagree with Mike.
The earth has gravity and that pulls objects towards the center of the planet
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If a heat engine takes in 4565 kJ and gives up 2955 kJ during one cycle, what is the engine’s efficiency?
vodomira [7]

The engine efficiency is 64.73 %

<u>Explanation:</u>

Given data

To find the engine’s efficiency we have the formula,

Energy input- 4565 KJ

Energy output - 2955KJ

Efficiency= energy output/ energy input ×100%

 =2955/4565

  =0.6473 ×100

η               =64.73 %

The engine efficiency is 64.73 %

5 0
3 years ago
. You are making a frame of uniform width for a picture that is to be displayed at the local museum. The picture is 4 feet tall
nikdorinn [45]

Answer:

1 feet

Explanation:

Frame width = x

The length of the frame will be

L=4+x+x (bottom and top that is why x is added twice)

\\\Rightarrow L=4+2x

The width of the frame will be

W=3+x+x\\\Rightarrow W=3+2x

Area is given by

A=LW\\\Rightarrow 30=(4+2x)(3+2x)\\\Rightarrow 30=12+14x+4x^2\\\Rightarrow 4x^+14x-18=0

Solving the above equation we get

x=\frac{-14+\sqrt{14^2-4\cdot \:4\left(-18\right)}}{2\cdot \:4}, \frac{-14-\sqrt{14^2-4\cdot \:4\left(-18\right)}}{2\cdot \:4}\\\Rightarrow x=1, -\frac{9}{2}

Hence width of the frame is 1 ft

4 0
3 years ago
What is one exsample of a closed economy​
GuDViN [60]

Answer:

When we talk about closed economy, it means that the economy is self-sufficient. At a closed economy, no imports from the outside are brought inside a nation and no exports are sent out as well

Explanation:

8 0
3 years ago
Read 2 more answers
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Answer:

Yes

Explanation:

On the moon there is no gravity. So if there is no gravity pulling the weight down a weight can as light as a feather.

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When boarding an airplane you bring a bag of chips. While in flight the bag puffs up, because suction is occurring. air pressure
s2008m [1.1K]

Answer:

air pressure in the air-tight bag is greater than cabin air pressure

Explanation:

7 0
2 years ago
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