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3 years ago

14

Select all of the answers that apply. Which of the following make the Earth unique when compared to the other planets in our sol

ar system?

1 answer:

zalisa [80]3 years ago

7 0

Earth is unique because Earth has gravity and other planets don't.

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• Most of the galaxies in the universe are moving away from

WARRIOR [948]

The frequency of the light observed from the Earth is $4.945\cdot 10^{14}Hz$

Explanation:

First of all, we start by noticing that the galaxy is receding from Earth (moving away): this means that according to the Doppler effect, the frequency of the light as seen from the Earth must be shorter than the real frequency of the light emitted by the galaxy.

Furthermore, we can quantify the change in frequency of the light using the following equation:

$\frac{\Delta f}{f}=\frac{v}{c}$

where

$\Delta f$ is the change in frequency

f is the real frequency

v is the velocity of recession of the galaxy (negative if the galaxy is moving away)

c is the speed of light

In this problem, we have:

$f=5.00\cdot 10^{14} Hz$

$v=-3325 km/s = -3.325\cdot 10^6 m/s$

$c=3\cdot 10^8 m/s$

Substituting and solving for $\Delta f$ , we find

$\Delta f = \frac{v}{c}f=\frac{-3.325\cdot 10^6}{3\cdot 10^8}(5.00\cdot 10^{14})=-5.542\cdot 10^{12} Hz$

And therefore, the frequency of the light observed from the Earth is

$f'=f+\Delta f = 5.00\cdot 10^{14} +(-5.52\cdot 10^{12})=4.945\cdot 10^{14}Hz$

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4 0

3 years ago

If a psychologist were to run an experiment measuring the effects of temperature on aggression the differing temperature would b

Yanka [14]

Answer:

(C) Independent variable

Explanation:

Independent is the variable used by the experimenter to vary a condition of interest in the experiment (temperature in this case). This measure is varied over a sensible range to induce changes in other aspects (dependent variables; level of aggression in this case) which are measured during the experiment.

4 0

3 years ago

In a client with lower crossed syndrome, which of the following muscles is lengthened?

jek_recluse [69]

Answer:

Internal Oblique.

Explanation:

Lower crossed syndrome is a condition in which there are strong and weak muscles. So there is an imbalance of muscle strengths. It occurs when some muscles constanly get shortened or lengthened just like in this case internal oblique muscle got lengthened.

6 0

3 years ago

An 877 kg drag race car accelerates from rest to 116 km/h in 0.951 s. What change in momentum does the force produce? Answer in

Eduardwww [97]

Answer:

The change in momentum is 28265.71 kg-m/s.

Explanation:

Given that,

Mass of a car, m = 877 kg

Initial velocity of the car, u = 0 (at rest)

Final velocity of the car, v = 116 km/h = 32.23 m/s

Time, t = 0.951 s

We need to find the change in momentum produced by the force. It can be calculated as the difference of final momentum and the initial momentum.

$\Delta P=m(v-u)\\\\=877\times (32.23-0)\\\\=28265.71\ kg-m/s$

So, the change in momentum is 28265.71 kg-m/s.

7 0

2 years ago

A 1.5 kg orange falls from a tree and hits the ground in 0.75s. What is the speed of the orange just before it hits the ground?

Olenka [21]

The final speed of the orange is 7.35 m/s

Explanation:

The motion of the orange is a free fall motion, since there is only the force of gravity acting on it. Therefore, it is a uniformly accelerated motion with constant acceleration $g=9.8 m/s^2$ towards the ground. So we can use the following suvat equation:

$v=u+at$

where

v is the final velocity

u is the initial velocity

a is the acceleration

t is the time elapsed

For the orange in this problem, we have

u = 0 (it is dropped from rest)

$a=g=9.8 m/s^2$ is the acceleration

Substituting t = 0.75 s, we find the final velocity (and speed) of the orange:

$v=0+(9.8)(0.75)=7.35 m/s$

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8 0

3 years ago