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3 years ago

5

Suppose you throw a football upward. Is it true or wrong to say that you have not increased the internal energy of the air withi

n the football

1 answer:

Ahat [919]3 years ago

5 0

Wrong because the energy would decrese

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A system where friction is considered and calculated

katrin [286]

Answer:

the answer is B :)

Explanation:

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7 0

2 years ago

A Thomson's gazelle can run at very high speeds, but its acceleration is relatively modest. A reasonable model for the sprint of

777dan777 [17]

Answer:

The correct answer will be:

(a) 27.3 m/s

(b) 3.8 s

Explanation:

According to the question:

Acceleration,

$a= 4.2 \ m/s^2$

Time,

$t = 6.5 \ s$

(a)

The gazelles top speed will be:

⇒ $V_{max} = at$

$=4.2\times 6.5$

$=27.3 \ m/s$

or,

$= 27 \ m/s$

(b)

As we know,

s = 30 m

Now,

⇒ $s = \frac{1}{2} at^2$

or,

⇒ $t=\sqrt{\frac{2s}{a} }$

On putting the given values, we get

$=\sqrt{\frac{2\times 30}{4.2} }$

$=\sqrt{\frac{60}{4.2} }$

$=3.78 \ s$

or,

$=3.8 \ s$

5 0

3 years ago

An object is placed 8.5 cm in front of a convex spherical mirror of focal length −14.0 cm. What is the image distance? Show all

Pani-rosa [81]

Given:

u = 8.5 cm

f = -14.0 cm

v = image distance

Using the mirror formula 1/u + 1/v = 1/f

1/8.5 + 1/v = 1/-14.0

Rewrite to solve for v:

v = (8.5 * -14.0) / (8.5 - (-14.0))

v = -119 / 22.5

v = -5.29 cm ( round answer as needed.)

5 0

3 years ago

Two polarizing sheets have their transmission axes crossed so that no light gets through. A third sheet is inserted between the

nika2105 [10]

Answer:

Check the explanation

Explanation:

Kindly check the attached images below for the step by step explanation to the question above.

6 0

3 years ago

A car traveling at a speed of 24 m/s comes to a stop at a red light. How much time will it take for the car to stop if its accel

hram777 [196]

Via kinematic equations we have:

$v_{final}=v_{initial}+at$

In this case since the car will stop the final velocity is 0, the initial velocity is 24 m/s and the acceleration is -8 m/s^2. Therefore, we need to isolate the time variable (t) and so:

$0=24\frac{m}{s}+(-8\frac{m}{s^2})t\\\\0-24\frac{m}{s}=-8\frac{m}{s^2}t\\\\\frac{-24\frac{m}{s}}{-8\frac{m}{s^2}}=t \\\\t=3s$

The car would come to a complete stop in 3 seconds.

6 0

4 years ago

Read 2 more answers