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3 years ago

50 points!

1 answer:

5 0

From Kepler's 3rd law, time period of satellite orbiting around planet in a circular orbit is given by,
T² = 4π²r³/GM
M= mass of the Earth = 6×10²⁴ Kg.
∴ T² = 4×3.14²×(2.56×10⁷)³/6.67×10⁻¹¹×6×10²⁴
T² = 1653339719
∴ T = 40661.28 seconds.

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Are the units of the formula ma = mv2/2 dimensionally consistent? Select the single best answer.

Vesnalui [34]

To solve the problem we will simply perform equivalence between both expressions. We will proceed to place your units and develop your internal operations in case there is any. From there we will compare and look at its consistency

$ma = \text{Mass}\times \text{Acceleration}$

$ma = kg \cdot \frac{m}{s^2}$

At the same time we have that

$\frac{1}{2}mv^2 = \text{Mass}\times \text{Velocity}^2$

$\frac{1}{2}mv^2 = kg ( \frac{m}{s})^2$

$\frac{1}{2}mv^2 = kg \cdot \frac{m^2}{s^2}$

Therefore there is not have same units and both are not consistent and the correct answer is B.

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4 years ago

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Sergio039 [100]

Answer is B

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3 years ago

This is a group of elements with few valence electrons that conducts heat and electricity.

k0ka [10]

Answer:

Metals

Explanation:

The group of elements with few valence electrons that conducts heat and electricity is known metals. Metals are good conductors of heat and electricity. The outer electrons in metals are loosely bound to the atom and are thus able to freely move around and conduct electricity and heat.

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4 years ago

A 28 kg rock falls freely near the surface of the Earth. Approximately how much gravitational force is exerted by the Earth on t

ValentinkaMS [17]

Answer :Force is exerted by the Earth on the rock is 280 N .

Given :

Mass of rock falling falling , m = 28 kg .

Acceleration due to gravity , $g=10\ m/s^2$ .

We need to find the force exerted by the earth on the rock .

Let force exerted be F .

Now , we know by Newton's Law Of Motion .

F = ma .......( 1 )

Here , m is mass and a is acceleration in this case it is $g=10\ m/s^2$ .

Putting all these value in equation( 1 ) we get ,

$F=28\times 10\\\\F=280\ N$

Therefore, this is the required solution .

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3 years ago

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kondaur [170]

Answer:

Explanation:

Think about rubbing your hands together- the friciton produces heat

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2 years ago