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-BARSIC- [3]
3 years ago
10

Which action requires no work by a cheerleader?

Physics
1 answer:
GuDViN [60]3 years ago
7 0
Technically, carrying her team-mate horizontally
along a level surface (D) doesn't require any 'work'.
You might be interested in
The force exerted on an object when it is in contact with another object as it moves or tries to move is?
Paraphin [41]
I think that friction is the force exerted on an object when it is in contact with another object as it moves or tries to move.
6 0
3 years ago
Which is true regarding AC current? The electrons move back and forth. The +/- polarity is constant. It is common in portable de
andre [41]

Answer: Option (a) is the correct answer.

Explanation:

AC current stands for alternating current. In an alternating current there is periodically reverse movement of current.

This means electrons move in one direction for a certain time and then they reverse their movement for the same time period and it continues in the back and forth position.

Thus, we can conclude that the statement electrons move back and forth is true regarding AC current.


7 0
4 years ago
Read 2 more answers
What is erosion and what are some famous things it has made?
Citrus2011 [14]

Answer:

Erosion is the wearing away if land by forces such as water and wind. It has created things such as mountain peaks, valleys and coastlines.

7 0
3 years ago
Cicadas produce a sound that has a frequency of 123Hz. What is the wavelength of this sound in air at room temperature? (2.79m)
Llana [10]

Answer:

2.72 m

Explanation:

Sound travels at a certain speed and has a frequency and wavelength. The relationship between the speed of sound (V), its frequency (f), and wavelength (λ) is the same as for all waves, it is given by the equation:

V = fλ

The speed of sound in air (V) is 334 m/s

Frequency of sound (f) = 123 Hz

Wavelength = λ

V = fλ

λ = V/f = 334/123

λ = 2.72 m

6 0
4 years ago
What are the component parts of modern fireworks? What does each part do?
EleoNora [17]

Answer: Aluminum, Antimony, Barium, Calcium, Carbon, Chlorine, Copper, Iron, Lithium, Magnesium, Oxygen, Zinc, Titanium, Strontium, Sulfur, Sodium, Potassium, Phosphorus

Explanation:

Aluminum: Aluminum is a common component of sparklers.  It is used to produce silver and white flames and sparks.

Antimony: Antimony is used to create firework glitter effects.

Barium: Barium is used to create green colors in fireworks, and it can also help stabilize other volatile elements.

Calcium: Calcium is used to deepen firework colors. Calcium salts produce orange shades in the fireworks.

Carbon: Carbon is an important components of black powder, which is used as a propellant in fireworks. Carbon provides the fuel for a firework. Common forms include carbon black, sugar, or starch.

Chlorine: Chlorine is an important component of many oxidizers in fireworks. Several of the metal salts that produce colors contain chlorine.

Copper: Copper compounds produce blue shades in fireworks.

Iron: Iron is used to produce sparks. The heat of the metal determines the color of the sparks in this case.

Lithium: Lithium is a metal that is used to impart a red color to fireworks. Lithium carbonate, in particular, is a common colorant.

Magnesium: Magnesium burns a very bright white, so it is used to add white sparks or improve the overall brilliance of a firework.

Oxygen: Fireworks include oxidizers, which are substances that produce oxygen in order to support. The oxidizers are usually nitrates, chlorates, or perchlorates. Sometimes the same substance is used to provide oxygen and color.

Phosphorus: Phosphorus burns spontaneously in air and is also responsible for some glow-in-the-dark effects. It may be a component of a firework's fuel.

Potassium: Potassium helps to oxidize firework mixtures. Potassium nitrate, potassium chlorate, and potassium perchlorate are all important oxidizers.

Sodium: Sodium produces a gold or yellow color in fireworks, however, the color may be so bright that it masks less intense colors.

Sulfur: Sulfur is a component of black powder. It is found in the firework's propellant/fuel.

Strontium: Strontium salts give a red color to fireworks. Strontium compounds are also important for stabilizing fireworks mixtures.

Titanium: Titanium metal can be burnt as powder or flakes to produce silver sparks.

Zinc: Zinc is used to create smoke effects in fireworks and other pyrotechnic devices.

5 0
4 years ago
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