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3 years ago

Can someone please explain this D: I don’t understand their answers I guess.

Physics

2 answers:

dangina [55]3 years ago

6 0

Ok. I will try to keep this simple.

Top row (horizontal blue row at the top) is the different attempts to run this race. The blue column on the left is how far they have gone.

To calculate the average time, you simply add everything in the column!

So to get the average time for the 1/4 checkpoint, (the first one)... add:

02.15

02.05

02.02

+________

6.22

I hope this helped to explain how this works It can be confusing but if you focus, you can figure it out! You can comment on this answer any other questions that you might have!

attashe74 [19]3 years ago

3 0

Answer:

Physics is the fundamental understanding of gravity so it details force and what comes up must come down.

Explanation:

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A series of optical telescopes produced an image that has a resolution of about 0.00350 arc second.

Mila [183]

Answer:

The smallest diameter is $D =122 \ m$

Explanation:

From the question we are told that

The resolution of the telescope is $\theta = 0.00350 \ arc \ second$

The wavelength is $\lambda = 1.70 \mu m = 1.70 *10^{-6} \ m$

From the question we are told that

$1 arc \ sec = \frac{1}{3600^o}$

So $0.00350 \ arc \ second = x$

Therefore

$x = 0.00350 * \frac{1}{3600 }$

$x = ( 9.722*10^{-7} )^o$

Now $1^o = \frac{\pi}{180}$

So $(9.722*10^{-7})^o = \theta$

=> $\theta = (9.722*10^{-7}) * \frac{\pi}{180}$

$\theta = 1.69*10^{-8} rad$

The smallest diameter is mathematically represented as

$D = \frac{1.22 \lambda }{\theta }$

substituting values

$D = \frac{1.22 * 1.7 *10^{-6}} {1.69 *10^{-8} }$

$D =122 \ m$

6 0

4 years ago

Which of these is NOT needed to sustain life on a planet? *

Vadim26 [7]

I think it’s proximity of the sun

7 0

3 years ago

In the child's game of tetherball, a rope attached to the top of a tall pole is tied to a ball. Players hit the ball in opposite

Eddi Din [679]

Answer:

option C

Explanation:

the ball is moving circular around the pole

Angular momentum of the system is constant

J = I ω

now,

$\omega\ \alpha\ \dfrac{1}{I}$

$\omega\ \alpha\ \dfrac{1}{mr^2}$

$\omega\ \alpha\ \dfrac{1}{r^2}$

the rope radius is decreasing as it revolving around the pole

angular speed is inversely proportional to radius.

so, the angular speed will increase.

The correct answer is option C

7 0

3 years ago

Normal faults occur from _____ stress and reverse faults occur from _____ stress.

natta225 [31]

Normal faults can be caused by physical stress.
Reverse faults can be caused by emotional stress.

3 0

3 years ago

In order to increase the speed in a gear system

Ludmilka [50]

Answer:

the driving gear must be larger than the driven gear

Explanation:

6 0

3 years ago