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3 years ago

5

What tells scientists about distant galaxies? a. How fast light travels c. The color of light that they give off b. If the are o

paque or transparent d. The kind of radio wave they give off

1 answer:

tamaranim1 [39]3 years ago

8 0

I Believe the answer is A but D looks good too.

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Hi please answer and show your work

jek_recluse [69]

Answer:

$\huge\boxed{\sf P.E. = 240\ MJ}$

$\huge\boxed{\sf K.E. = 19.6\ MJ}$

Explanation:

<u>Given:</u>

Mass = m = 200,000 kg

Vertical Distance = h = 120 m

Speed = v = 14 m/s

Acceleration due to gravity = g = 10 m/s²

<u>Required:</u>

1) Gravitational Potential Energy = P.E = ?

2) Kinetic Energy = K.E. = ?

<u>Formula:</u>

1) P.E. = mgh

2) K.E. = $\displaystyle \frac{1}{2} mv^2$

<u>Solution:</u>

1) P.E. = (200,000)(10)(120)

P.E. = 240,000,000 Joules

P.E. = 240 Mega Joules

P.E. = 240 MJ

2) K.E. = 1/2 (200000)(14)^2

K.E. = (100000)(196)

K.E. = 19,600,000 Joules

K.E. = 19.6 MJ

$\rule[225]{225}{2}$

Hope this helped!

<h3>~AH1807</h3>

4 0

3 years ago

A car weighing 9800 N travels at 30 m/s. What braking force brings it to rest in 100m? In 10 m?

Svetach [21]

As per kinematics equation we know that

final speed of the car = 0 m/s

initial speed is given as 30 m/s

distance moved = 100 m

now we have

$v_f^2 - v_i^2 = 2 a d$

$0 - 30^2 = 2(a)(100)$

$a = - 4.5 m/s^2$

now braking force is given as

$F = ma$

now for mass we know that the weight of car is

$W = mg = 9800 N$

so mass of car is

$m = 1000 kg$

now we have

$F = 1000(4.5) = 4500 N$

Part b)

Again we have

final speed of the car = 0 m/s

initial speed is given as 30 m/s

distance moved = 10 m

now we have

$v_f^2 - v_i^2 = 2 a d$

$0 - 30^2 = 2(a)(10)$

$a = - 45 m/s^2$

now braking force is given as

$F = ma$

mass of car is

$m = 1000 kg$

now we have

$F = 1000(45) = 45000 N$

4 0

3 years ago

What happens to the force between two objects if the masses of both the objects are doubled

zzz [600]

Answer:

if the mass of both objects is doubled, then the force of gravity between them is quadrupled and so on

3 0

3 years ago

HELP WITH MY ENVIORMENTAL SCIENCE EXAM WILL RATE THE BRAINIEST

yawa3891 [41]

Answer:

what do you have to do

Explanation:

5 0

3 years ago

Read 2 more answers

I need help pls help me

chubhunter [2.5K]

Answer:

D

Explanation:

I am assuming that you got to go up to Zak as his editor and tell him in his face if he is doing the work correctly. Dont trust me though, cause C also looks plausible

6 0

3 years ago