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3 years ago

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The surface temperature of a star can be estimated based on the star’s a. size. c. age. b. color. d. mass. Please select the bes

t answer from the choices provided

2 answers:

kow [346]3 years ago

7 0

The anwser is
b. color

Citrus2011 [14]3 years ago

6 0

The answer is B. The color of the star can estimate the surface temperature of a star.

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The Atwood’s machine shown consists of two blocks of mass m1 and m2 that are connected by a light string that passes over a pull

Talja [164]

(A) For the system consisting of the two blocks, the change in the kinetic energy of the system is equal to work done by gravity on the system.

(D) For the system consisting of the two blocks, the pulley and the Earth, the change in the total mechanical energy of the system is zero.

<h3 /><h3>The given parameters:</h3>

Mass of block 1 = m1
Mass of block 2, = m2
Height of block 1 above the ground, = h1
Height of block 2 above the ground = h2

The total initial mechanical energy of the two block system is calculated as follows;

$m_1gh_1 + \frac{1}{2} m_1v_1_i^2 = m_2gh_2 + \frac{1}{2} m_2v_2_i^2\\\\m_1gh_1 + 0 = m_2gh_2 + 0\\\\m_1gh_1 = m_2gh_2\\\\m_1gh_1 - m_2gh_2 = 0$

When the block m2 reaches the ground the block m1 attains maximum height and the total mechanical energy at this point is given as;

$m_1g(h_1 + h_2) + K.E_1 = \frac{1}{2}m_2v_{max}^2 + P.E_2\\\\m_1g(h_1 + h_2 ) -PE_2 = \frac{1}{2}m_2v_{max}^2 - K.E_1\\\\m_1g(h_1 + h_2 ) - 0= \frac{1}{2}m_2v_{max}^2 - 0\\\\m_1g(h_1 + h_2 ) = \frac{1}{2}m_2v_{max}^2\\\\W = \frac{1}{2}m_2v_{max}^2$

Thus, we can conclude the following before the block m2 reaches the ground;

For the system consisting of the two blocks, the pulley and the Earth, the change in the total mechanical energy of the system is zero.
For the system consisting of the two blocks, the change in the kinetic energy of the system is equal to work done by gravity on the system.

Learn more about conservation of mechanical energy here: brainly.com/question/332163

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3 years ago

George rides his bike to his friend’s house that is 5 kilometers from his house. If he rides his bike at an average speed of 15

oksano4ka [1.4K]

I haven’t learned math in forever sorry

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3 years ago

How much power is needed to lift a book to a height of 2.0 meters in a time of 1.0 second, if the book exerts a force of 20 Newt

saul85 [17]

Answer: P = 40 W

Explanation: Power is defined as the amount of work per unit time or expressed in the formula of P = W /t

Work is the product of force and distance so W = Fd.

So the working equation will be:

P = Fd / t

= 20 N ( 2.0 m) / 1 s

= 40 W

Is the amount of power exerted.

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3 years ago

Unos observadores en dos pueblos A y B, a cada lado de una montaña de 15 000 pies de altura, miden los ángulos de elevación entr

allochka39001 [22]

Answer:

6the first is a one block and the two are u to be the best in freefire with the best and best name to get

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the first time he was a boy and a girl in the 6AM he is a girl who has 6666th grade 6inches

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3 years ago

A bullet traveling at 350 m/s hits a tree, penetrating 0.125 m into the tree before stopping. The mass of the bullet is 0.200 kg

Sloan [31]

Answer:

$-4.9\cdot 10^5 m/s^2$

Explanation:

The motion of the bullet is a uniformly accelerated motion, therefore we can find its acceleration by using the following suvat equation:

$v^2-u^2=2as$

where

v is the final velocity

u is the initial velocity

a is the acceleration

s is the distance covered

For the bullet in this problem:

u = 350 m/s is the initial velocity of the bullet

v = 0 is the final velocity (the bullet comes to a stop)

s = 0.125 m is the stopping distance of the bullet

Therefore, by solving the equation for a, we find its acceleration:

$a=\frac{v^2-u^2}{2s}=\frac{0^2-350^2}{2(0.125)}=-4.9\cdot 10^5 m/s^2$

And the negative sign tells that the direction of the acceleration is opposite to that of the velocity.

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4 years ago