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Alenkasestr [34]
3 years ago
14

28. Someone throws a rubber ball vertically upward from the roof of a building 8.00 m in height. The ball rises,

Physics
1 answer:
Debora [2.8K]3 years ago
6 0

Answer:

v_o= 12 m/s

Explanation:

The ball experienced a constant acceleration motion, so we need to apply the following formula:

y=y_o+v_o*t+\frac{1}{2}*a*t^2\\\\vo=\frac{y-y_o-\frac{1}{2}*a*t^2}{t}\\\\v_o=\frac{0m-8m-\frac{1}{2}*(-9.81m/s^2)*(3.00s)^2}{3.00s}\\v_o=12m/s

Note: we set the acceleration of gravity as negative because it is going down.

the ball was thrown vertically upward with an initial velocity of 12 m/s

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Which of the following is not a process that forms metallic ore
Kamila [148]

 

I believe that this question has the following choices to choose from:

placer deposits

fossil compaction

hydrothermal solutions

igneous processes

 

Actually among all, I have never encountered an ore that formed due to fossil compaction. I suppose we can get minerals such as marble or lime but not ores. So the answer is:

 

<span>fossil compaction                (answer)</span>

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3 years ago
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n a car lift used in a service station, compressed air exerts a force on a small piston that has a circular cross section of rad
Oksi-84 [34.3K]

Answer: 1477.78 N

Explanation:

Let's assume that the cross sectional area of the smaller piston be A1

let's also assume the cross sectional area of the larger piston be A2

We assume the force applied to the smaller piston be F1

We also assume the force applied to the larger piston be F2

we then use the formula

F1/A1 = F2/A2

From our question,

The radius of the smaller piston is 5 cm = 0.05 m

The radius of the larger piston is 15 cm = 0.15 m

The force of the larger piston is 13300 N

The force of the smaller piston is unknown = F

A1 = πr² = 3.142 * 0.05² = 0.007855 m²

A2 = πr² = 3.142 * 0.15² = 0.070695 m²

F1/0.007855 = 13300/0.070695

F1 = (13300 * 0.007855) / 0.070695

F1 = 104.4715 / 0.070695

F1 = 1477.78 N

Thus, the force the compressed air must exert is 1477.78 N

5 0
3 years ago
If the coolant in an air conditioner has a higher temperature than the air in a building, then _____.
Paul [167]
<span>C.heat will flow from both the coolant and the air 
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2 years ago
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What is law of conservation of mass​
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Explanation:

<h2>law of conservation of mass</h2>

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2 years ago
A Coolie raises a box of mass 20 kg to a height of 1.5m. If the force of gravity on 1 kg is 10N. The work done by the Coolie is​
Makovka662 [10]
Solution:
Mass(m)=20kg
Displacement (s)=1.5m
For 1 kg force of gravity=10N
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F=mg
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Then,
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or,W=mxgxs
=20x10x1.5
=300J
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3 years ago
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