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lozanna [386]
3 years ago
12

A _____ has been tested and supported many times whereas a _____ is an idea about how things might work.

Physics
1 answer:
Gnoma [55]3 years ago
4 0

Answer:

b. scientific theory, hypothesis

Explanation:

Hypothesis is an idea which is claim about any happening and how things work. On the other hand Scientific theory is tested. if it is proven correct by all ways, it becomes a law.

SO our correct answer is:

A <u>scientific theory</u> has been tested and supported many times whereas a <u>hypothesis</u> is an idea about how things might work.

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A refrigerator has a mass of 88 kg. What is the weight of the refrigerator?
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I don't think the information is complete

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A cat leaps into the air to catch a bird with an initial speed of 2.74 m/s at an angle of 60.0° above the ground. What is the hi
Volgvan

Answer: D. 0.29 m

Explanation:

We will use the following equations to describe the leap of the cat:

y=V_{o}sin\theta t-\frac{gt^{2}}{2}   (1)

V_{y}=V_{oy}-gt   (2)

Where:

y  is the height of the cat  

V_{oy}=V_{o}sin\theta is the cat's initial velocity

\theta=60\°

g=9.8m/s^{2}  is the acceleration due gravity

t is the time

V_{y} is the y-component of the velocity

Now the cat will have its maximum height y_{max} when V_{y}=0. So equation (2) is rewritten as:

0=V_{oy}-gt   (3)

Finding t:

t=\frac{V_{oy}}{g}=\frac{V_{o}sin\theta}{g}   (4)

t=\frac{2.74 m/s sin(60\°)}{9.8m/s^{2}}   (5)

t=0.24 s   (6)

Substituting (6) in (1):

y_{max}=(2.74 m/s)sin(60\°) (0.24 s)-\frac{(9.8m/s^{2})(0.24 s)^{2}}{2}   (7)

Finally:

y_{max}=0.287 m \approx 0.29 m   (8)

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