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gladu [14]
3 years ago
8

A 25 kg rock resting on the bottom of a lake must be moved from the paths of boats. The rock has a density of 2350 kg/m^3. What

force is needed to lift the rock while under water?
Physics
1 answer:
algol133 years ago
7 0

Answer:

The force needed is the weight of the rock minus the buoyant force.

Explanation:

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At an air show, a stunt pilot performs a vertical loop-the-loop in a circle of radius 3.63 x 103 m. During this performance the
san4es73 [151]

Answer:

189 m/s

Explanation:

The pilot will experience weightlessness when the centrifugal force, F equals his weight, W.

So, F = W

mv²/r = mg

v² = gr

v = √gr where  v = velocity, g = acceleration due to gravity = 9.8 m/s² and r = radius of loop = 3.63 × 10³ m

So, v = √gr

v = √(9.8 m/s² × 3.63 × 10³ m)

v = √(35.574 × 10³ m²/s²)

v = √(3.5574 × 10⁴ m²/s²)

v = 1.89 × 10² m/s

v = 189 m/s

5 0
3 years ago
1.) What statement best explains the type of population growth seen in Belize according to the 2010 age structure diagram?
Art [367]

Answer:

1. Belize has a high birth rate and a low death rate.

2. Belize will have a rapidly growing population over the next twenty years.

Explanation:

Belize has a high birth rate and a low death rate. Belize is in the phase II of the demographic transition model. Their population is growing exponentially. This is due to lowering death rates while the birth rates are still high.

Belize will have a rapidly growing population over the next twenty years. When the age structure diagram has a wider base than the middle or top age groups, this indicates a population that is rapidly growing. Belize is early in the transition model and still has high birth rates. Countries like Belize typically have lower opportunities for education for women of reproductive age, can have high infant mortality, and can have high emigration rates.

7 0
3 years ago
Easy quiz easy points 7
Darya [45]
The answer is 2: hush
5 0
3 years ago
Read 2 more answers
Helpppppppppppppppppppppppo pretty plsssss
fgiga [73]

Answer:

3

Explanation:

Im pretty sure its number 3

6 0
3 years ago
Now that you have learned about measuring electricity, complete and submit the following projects Complete the following: 1. Exa
allochka39001 [22]

Answer:

in the attached documents are the answers i made a 100 on it

Explanation:

Download pdf
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3 years ago
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