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3 years ago

A ball is dropped from rest. Its energy is transformed from ________.

Physics

1 answer:

melisa1 [442]3 years ago

8 0

Answer:

gravitational potential energy

When the ball falls, some of its gravitational potential energy is converted to other forms of energy, such as kinetic energy and rotational energy. When it rebounds, these other forms of energy is converted back to gravitational potential energy.

Explanation:

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The radius of Mars (from the center to just above the atmosphere) is 3400 km (3400 × 103 m), and its mass is 6 × 1023 kg. An obj

Nataly [62]

Answer:

Explanation:

Potential energy at the surface

= -GMm / R

= -6.6 x 10⁻¹¹ x 6 x 10²³ m / 3400 x 10³

= -1.1647 x 10⁷ m

If v be required velocity

Total energy at surface

= 1/2 m v² -1.1647 x 10⁷ m

= energy at farr off = 1/2 m x 3000²

1/2 m v² - -1.1647 x 10⁷ m = 1/2 m x 9 x 10⁶

1/2 v²= 1.1647 x 10⁷ + .45 x 10⁷

= 1.6147 x 10⁷

v² = 2.3303 x 10⁷

v = 4.827 x 10³ m / s

b ) For final speed zero at infinity

1/2 m v² - -1.1647 x 10⁷ m = 0

1/2 v² = 1.1647 x 10⁷

v² = 2.3294 x 10⁷

v = 4.826 x 10³ m /s

7 0

3 years ago

Thermopane window is constructed, using two layers of glass 4.0 mm thick, separated by an air space of 5.0 mm.

Bond [772]

To solve this problem it is necessary to apply the concepts related to rate of thermal conduction

$\frac{Q}{t} = \frac{kA\Delta T}{d}$

The letter Q represents the amount of heat transferred in a time t, k is the thermal conductivity constant for the material, A is the cross sectional area of the material transferring heat, $\Delta T$ , T is the difference in temperature between one side of the material and the other, and d is the thickness of the material.

The change made between glass and air would be determined by:

$(\frac{Q}{t})_{glass} = (\frac{Q}{t})_{air}$

$k_{glass}(\frac{A}{L})_{glass} \Delta T_{glass} = k_{air}(A/L)_{air} \Delta T_{air}$

$\Delta T_{air} = (\frac{k_{glass}}{k_{air}})(\frac{L_{air}}{L_{glass}}) \Delta T_{glass}$

$\Delta T_{air} = (\frac{0.84}{0.0234})(\frac{5}{4}) \Delta T_{glass}$

$\Delta T_{air} = 44.9 \Delta T_{glass}$

There are two layers of Glass and one layer of Air so the total temperature would be given as,

$\Delta T = \Delta T_{glass} +\Delta T_{air} +\Delta T_{glass}$

$\Delta T = 2\Delta T_{glass} +\Delta T_{air}$

$20\°C = 46.9\Delta T_{glass}$

$\Delta T_{glass} = 0.426\°C$

Finally the rate of heat flow through this windows is given as,

$\Delta {Q}{t} = k_{glass}\frac{A}{L_{glass}}\Delta T_{glass}$

$\Delta {Q}{t} = 0.84*24*10 -3*0.426$

$\Delta {Q}{t} = 179W$

Therefore the correct answer is D. 180W.

3 0

3 years ago

Explain why white light splits up into the different colours when it goes through a prism

Paladinen [302]

Explanation:

beacuse light is mixture of many different colours,each with different frequency

7 0

3 years ago

Use the data to answer the question.<br><br><br><br> Which statement best describes the data?

Natasha2012 [34]

A statement which best describes the data is that: C. they are precise and reproducible.

<h3>What is an experiment?</h3>

An experiment can be defined as a scientific investigation which typically involves the process of manipulating an independent variable (the cause), so as to determine or measure the dependent variable (the effect).

Data can be defined as a representation of instructions or factual information in a formalized manner, especially as a series of binary digits (bits) or samples that are used by scientist in an experiment or research.

<h3>The types of data.</h3>

Generally, there are two (2) main types of data and these include:

Primary data

Secondary data

Based on the data provided in the table (see attachment), we can infer and logically deduce that a statement which best describes the data is that they are precise and reproducible.

Read more on experiments here: brainly.com/question/25322325

#SPJ1

Complete Question:

Which statement best describes the data?

A. They are accurate and reproducible.

B. They are accurate but not reproducible.

C. They are precise and reproducible.

D. They are precise but not reproducible.

7 0

2 years ago

If an element has 20 protons and 20 neutrons in the nucleus of its atoms , what is the mass number of the atom?

Ilya [14]

Answer:

A=z+n

A=20+20

A=40

Explanation:

Not sure if I'm correct but I was taught that mass number is calculated by A=z+n where A is the mass number, z is the proton number and n is the number of neutrons.

8 0

3 years ago