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3 years ago

Suppose a 2.0kg bird is flying at a speed of of 1m/s. It’s kinetic energy would be what?

Physics

1 answer:

Ganezh [65]3 years ago

7 0

As we know that the formula of kinetic energy will be

$KE = \frac{1}{2} mv^2$

now here we know that

m = 2 kg

v = 1 m/s

so from the above equation we have

$KE = \frac{1}{2}(2)(1^2)$

$KE = 1 J$

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What is the best thermal insulator? aluminum copper steel or glass

anyanavicka [17]

Answer:

Copper is a better heat conductor than glass. In general, we think of metals as good conductors. In fact, metals vary widely in their conductivity but, overall, they are better conductors of heat than most liquids and gasses. Other solids also vary in their capability to conduct heat.

Explanation:

7 0

3 years ago

Bailey walks to the pizza place for lunch. To get there, she walks 3 km East, then 8 km south, and then 3 Km East again

sveticcg [70]

Answer:

Total distance she cover = 14km

Magnitude of displacement = 10 km

Direction of her displacement is East-south

Explanation:

Given:

Distance travel (East) = 3 km

Distance travel to south = 8 km

Distance travel (East) = 3 km

Computation:

Total distance she cover = 3km+8km+3km

Total distance she cover = 14km

Magnitude of displacement = $\sqrt{(3+3)^2+(8)^2}\\$

Magnitude of displacement = 10 km

Direction of her displacement is East-south

8 0

4 years ago

You drop a single coffee filter of mass 1.5 grams from a very tall building, and it takes 49 seconds to reach the ground. In a s

Tresset [83]

(a) 0.0147 N

When the filter reaches the terminal speed, it means that its acceleration is now zero, so the net force acting on it is zero.

There are only two forces acting on the filter:

- The weight of the filter, downward: W = mg, where

$m=1.5 g = 0.0015 kg$ is the mass of the filter

$g=9.8 m/s^2$ is the acceleration due to gravity

- The air resistance, upward, $F_a$

Since the net force is zero, we have

$W-F_a =0$

and solving the equation we find the upward force of air resistance:

$F_a=W=mg=(0.0015kg)(9.8 m/s^2)=0.0147 N$

(b) 0.0441 N

The problem is exactly identical to before, but this time the mass of the stack of filters is 3 times the mass of the single filter, so

$m=3 (0.0015 kg)=0.0045 kg$

And so, the upward force of air resistance is

$F_a = mg=(0.0045 kg)(9.8 m/s^2)=0.0441 N$

(c) 28.3 s

We know that the single coffee filter takes t=49 s to reach the ground, travelling at constant terminal speed of v, so the distance covered (the height of the building) is

$d=vt$

where t = 49 s.

We also know that the air resistance is proportional to the square of the terminal speed:

$F_{air} \propto v^2$

which means

$v\propto \sqrt{F_{air}}$

For the stack of three filters, we found (b) that the air resistance is 3 times the air resistance for the single filter (a). Therefore, the terminal speed of the stack of filter will be $\sqrt{3}$ times larger than the terminal speed of the single filter.

Therefore, the time taken will be:

$t'=\frac{d}{v'}=\frac{d}{\sqrt{3} v}=\frac{t}{\sqrt{3}}$

And since t = 49 s, we have

$t'=\frac{49 s}{\sqrt{3}}=28.3 s$

8 0

3 years ago

What is gama rays an it's uses

pav-90 [236]

Answer:

GAMMA RAYS:

A photon emitted spontaneously by a radioactive substance also : a photon of higher energy than that of an X-ray.

USES OF GAMMA RAYS:

Gamma rays are used in medicine (radiotherapy), industry (sterilization and disinfection), and the nuclear industry. Shielding against gamma rays is essential because they can cause diseases to skin or blood, eye disorders, and cancers.

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3 years ago

Larry and Balky set up an experiment to analyze the motion of a marble as it rolled down an incline. They started the marble at

erik [133]

Answer:

Option A is the correct answer.

Explanation:

The instantaneous acceleration = Change in velocity in velocity/Time taken

The slope of the graph should give instantaneous acceleration.

Slope of a graph = Change in value of Y -axis / Change in values of X -axis

Comparing both the equations

Change in value of Y -axis = Change in velocity in velocity

Change in values of X -axis = Time taken

So velocity values should be on the Y axis and Time values should be on the X axis.

Option A is the correct answer.

7 0

3 years ago

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