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4 years ago

Can someone help me?!!!!!

Physics

1 answer:

sammy [17]4 years ago

4 0

Answer:

Explanation:

The first one is false. A vector has a magnitude and a direction; a scalar only has a magnitude. The two cannot be added together.

The second one is false. The magnitude of a vector is found using Pythagorean theorem: c² = a² + b². The only way the magnitude of a vector (c) can be 0 is if <em>both</em> components are 0 (a=0 and b=0).

The third one is true. A vector in Quadrant III will have negative components but can still have a positive magnitude. For example, a vector with magnitude 1 and direction 225° has a positive magnitude and negative components.

The fourth one is false. Rotating a vector will change it.

The fifth one is false. A vector sum can only be 0 if the two vectors have equal magnitudes and opposite directions.

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..... equal to the force from the engine pushing the car forward.

That's why the car is not accelerating. The horizontal forces on it
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3 years ago

One student made the incomplete diagram shown below to represent the relationship between igneous rocks, sediments, sedimentary

Kryger [21]

Answer: Option (C)

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Igneous rocks when undergoes high temperature and pressure condition, it transforms into a metamorphic rock.
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Hence the correct answer is option (C)

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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

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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

$m_E =$ Mass of the Earth

Therefore the ratio of the velocity from two satellites is,

$\frac{v_1}{v_2} = \sqrt{\frac{r_2}{r_1}}$

The ratio between the two satellites is the same, then

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

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

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Therefore the correct option is B.

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4 years ago

______ Made geocentric model of the solar system using epicycles

stiks02 [169]

Answer:

Ptolemy made geocentric model of the solar system using epicycles

Explanation:

Ptolemy made geocentric model of the solar system using epicycles.

This model accounted for the apparent motions of the planets in a very direct way, by assuming that each planet moved on a small circle, called an epicycle, which moved on a larger circle, called a deferent.

Therefore, Ptolemy is the answer.

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3 years ago

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4 years ago

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