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3 years ago

When electrons move down energy levels, are they gaining or losing energy?

1 answer:

5 0

When they move closer to the nucleus, they are said to be losing energy; however, they most likely move up through the shells and gain energy. Also, they are unstable in the new shells, so they usually return to their original shells and expel the extra energy through photons or other means.

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Sarah is measuring how fast a marble rolls down a ramp when she changes the height of the ramp. W hitch type of graph would most

alexgriva [62]

The type of graph that would most appropriately display Sarah's data is a line graph.

<h3>What is a line graph?</h3>

A line graph, sometimes referred to as a line plot or a line chart, is a graph in which individual data points are connected by lines. A line graph shows numerical values over a predetermined period of time.

Line graphs are frequently used in finance to show the historical price movement of an asset or instrument. To monitor changes over both short and long time periods, line graphs are utilized. Line graphs can be used to compare changes for multiple groups over the same time period.

In this case, it should be noted that Sarah wants to compare the speed and the height. Therefore, the line graph and s appropriate.

Learn more about graph on:

brainly.com/question/19040584

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8 0

2 years ago

A system undergoing a power cycle develops a steady power output of 0.3 kW while receiving energy input by heat transfer at a ra

uranmaximum [27]

Answer:

The thermal efficiency is 43%.

The total amount of energy developed by work is 397 kW in one year.

Explanation:

Given that,

Power output = 0.3 kW

Heat energy = 2400 Btu/h = 0.703 kW

We need to calculate the thermal efficiency

Using formula of efficiency

$\eta=\dfrac{out-put}{in-put}$

Put the value into the formula

$\eta=\dfrac{0.3}{0.703}$

$\eta=0.43\times100$

$\eta=43\%$

The thermal efficiency is 43%.

(b). We need to calculate the total amount of energy

Using formula of energy

$E=0.43\times0.703\times60\times60\times365$

$E=397209.06\ J$

$E=397\ kW$

Hence, The thermal efficiency is 43%.

The total amount of energy developed by work is 397 kW in one year.

4 0

4 years ago

In which terrestrial biome would you find precipitation of 300 to 900 millimeters (mm) each year?

Crazy boy [7]

Coniferous Forest i believe.

Have a good day and hope it helped.

3 0

3 years ago

Read 2 more answers

A boy takes hold of a rope to pull a wagon (m = 50 kg) on a surface with a static coefficient of friction μS = 0.25. Calculate t

vivado [14]

Answer:

<em>The force that would be applied on the rope just to start moving the wagon is 122 N</em>

Explanation:

Frictional force opposes motion between two surfaces in contact. It is the force that must be applied before a body starts to move. Static friction opposes the motion of two bodies that are in contact but are not moving. The magnitude of static friction to overcome for the body to move can be calculated using equation 1.

F = μ x mg .............................. 1

where F is the frictional force;

μ is the coefficient of friction ( μs, in this case, static friction);

m is mass of the object and;

g is the acceleration due to gravity( a constant equal to 9.81 m/ $s^{2}$ )

from the equation we are provide with;

μs = 0.25

m = 50 kg

g = 9.81 m/ $s^{2}$

F =?

Using equation 1

F = 0.25 x 50 kg x 9.81 m/ $s^{2}$

F = 122.63 N

<em>Therefore a force of 122 N must be applied to the rope just to start the wagon.</em>

6 0

4 years ago

Read 2 more answers

The steel ball in a pinball game rolls around a flat, tilted surface. If you flick the ball straight uphill, it gradually slows

Brilliant_brown [7]

Why: As the steel ball rolls uphill, the velocity gradually decreases and finally the ball stops, thus, the acceleration will be in the opposite direction of motion (that is downhill). After the stop, the ball will start rolling downhill by an increasing velocity, thus, the acceleration in this case will be in the same direction as the motion (downhill again).

7 0

3 years ago