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3 years ago

(04.02 LC)

Physics

2 answers:

sdas [7]3 years ago

7 0

Answer: mixture

Explanation: mixture contains two or more substances which are not chemically bonded together

svetlana [45]3 years ago

6 0

Answer:

B. Mixture

Explanation:

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Which of the following point towards the center of the circle in uniform circular motion?

Luba_88 [7]

Answer: E) Acceleration, net force

Explanation: In order to explain this problem we have to consirer that the uniform circulat motion has constant angular velocity (ω) and the vector velocity is changed its direction for any point that cover the circle but its modulus is contant and its value is v=ω*R. In order to ensure these conditions, the net force also the accelaration called centripetal must point to the center of the circular trajectory.

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4 years ago

Two satellites orbit the Earth in circular orbits of the same radius. One satellite is twice as massive as the other. Which stat

loris [4]

To solve this problem it is necessary to apply the concepts related to the orbital velocity of a satellite on earth.

This concept is expressed in the equation,

$v = \sqrt{\frac{Gm_E}{r}}$

Where,

G = Universal Gravitational constant

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The ratio between the two satellites is the same, then

$\frac{v_1}{v_2} = \sqrt{\frac{r}{r}}$

$\frac{v_1}{v_2} = 1$

$v_1 =v_2$

Therefore the correct option is B.

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3 years ago

7. A 1.0 kg metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained

marta [7]

The increase in temperature of the metal hammer is 0.028 ⁰C.

The given parameters:

mass of the metal hammer, m = 1.0 kg
speed of the hammer, v = 5.0 m/s
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The increase in temperature of the metal hammer is calculated as follows;

$Q = K.E\\\\mc \Delta T = \frac{1}{2} mv^2\\\\\Delta T = \frac{v^2}{2 c}$

where;

c is the specific heat capacity of the metal hammer

Assuming the metal hammer is iron, c = 450 J/kg⁰C

$\Delta T = \frac{5^2}{2 \times 450} \\\\\Delta T = 0.028 \ ^0C$

Thus, the increase in temperature of the metal hammer is 0.028 ⁰C.

Learn more about heat capacity here: brainly.com/question/16559442

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3 years ago

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The answers would be:

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4. All atoms of an element are identical.

5. Chemical reactions cause atoms to be rearranged.

Although all of the statements regarding atoms are true, because of the technology during Dalton's time, the others were not yet discovered. As time progressed modifications were made which built our modern atomic theory.

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