How much power, in watts, is needed to cut a lawn in 50 min if the work involved is 100,000 J?

Answers

Answer 1

Answer:

33.33 Watt

Explanation:

we know that P= W/t

W= work

t= time (in seconds)

so here

W= 100,000J

and t= 50 min= 50×60 sec= 3000 s

so P= 100,000/ 3000

=100/3 = 33.33Watt


Related Questions

Which tool would be best to allow you to make observations of an object's color and texture?
A Digital Camera
B Balance Scale
C Graduated Cylinder
D Digital Thermonter

Answers

Answer:

A digital camera. You can zoom and all that stuff and see individual pixels when  close up. Also none of the other options would make sense.

Explanation:

Which solution has the greatest number of hydroxide ions?



i need a friend....

Answers

Answer:

homogeneous solutions

The answer is homogeneous solutions

A 20.0g sample of metal with a specific heat of 5 J/(g°C) raised it's initial temperature to 40.0 when 500J heat was added. What was the initial temperature of the metal?

Answers

The initial temperature of the metal = 35 °C

Further explanation

Heat can be formulated :

Q = m . c . ΔT

Q = heat, J

c = specific heat, J/g C

ΔT = temperature, °C

m = 20 g

c = 5 J/(g°C)

Q = 500 J

T₁ = 40 C

the initial temperature :

[tex]\tt \Delta t(T_2-T_1)=\dfrac{Q}{m.c}\\\\40-T_1=\dfrac{500}{20.5}\\\\40-T_1=5\\\\T_1=35^oC[/tex]

The solubility of gas in water at 25 C and 1.0 atm pressure of oxygen is 0.061 g/ L. What would the pressure be if the solubility of oxygen water at 25 C is 0.075 g/L

Answers

Answer:

P2 = 1.2265 atm (Approx)

Explanation:

Given:

Water temperature = 25 degree Celsius

Pressure = 1 atm

So,

P1/P2 = C1/C2

1 / P2 = 0.061 / 0.075

P2 = 1.2265 atm (Approx)

i need help with chem ????????

Answers

Answer:

69

Explanation:

A wooden block has a mass of 562 g and a volume of 72 cm3. What is the density rounded to the nearest tenth!

Answers

Answer:

The answer is 7.81 g/cm³

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

From the question we have

[tex]density = \frac{562}{72} \\ = 7.80555555...[/tex]

We have the final answer as

7.81 g/cm³

Hope this helps you

Answer:

r

Explanation:


How many moles of Mg2+
are in 6.4 X1022 ions?

Answers

Answer:

0.11 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{6.4 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.10631229...[/tex]

We have the final answer as

0.11 moles

Hope this helps you

schroedinger thought that electrons

Answers

Answer:

In Niels Bohr's theory of the atom, electrons absorb and emit radiation of fixed wavelengths when jumping between fixed orbits around a nucleus. The theory provided a good description of the spectrum created by the hydrogen atom, but needed to be developed to suit more complicated atoms and molecules.

Explanation:

What is the volume of 89.6 moles of gas at STP *

Answers

Volume = 89.6 x 22.4 = 2,007.04L

How are the pressure and temperature of a gas related

Answers

Answer:

The pressure of a given amount of gas is directly proportional to its absolute temperature, provided that the volume does not change (Amontons's law). ... The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law).

Answer:

pressure is directly proportional to temperature at constant volume

Listening is a more complex process than hearing.

Answers

Arent listening and hearing and listening the same thing.

13
0121
This question is about sodium and chlorine.
FIGURE 2 shows the positions of sodium and
chlorine in the periodic table.
FIGURE 2
CI
Na
02
State ONE difference and ONE similarity in t
electronic structure of sodium and of chlori
[2 marks]

Answers

The question is asking you to compare each elements electrons, specifically valence since it mentioned their placement on the table.

Similarly: they both are only one electron away from stability (a full octet)

Difference: Sodium will want to loose the one electron, and Chlorine will take it.

which of the following statements is true?
A. A technology society has no impact on the environment.
B. A technology society has a completely positive impact on the environment.
C. A technology society has both a positive and negative impact on the environment
D. A technology society a completely negative impact on the environment.
Please select the best answer from the choices provided

Answers

Answer:

C. A technology society has both a positive and negative impact on the environment

Explanation:

We are using up earth's resources but bettering social society!

Have a nice day,

PumpkinSpice1♥



Be sure to use two (2) sources of information (one source can be your book). In your response, you MUST state your source. Your response should be between 100 and 150 words.

Answers

Answer:

^=E9>*t

Explanation:

Heeeelp,,, serious answers only pls i dont wanna hear about your love life

Answers

The answer is 8 atoms are present

The table below lists the properties of a metallic element.

shiny, silver colored, forms +1 and +2 ions, compound with sulfur is bright red.

Where on the periodic table would this element most likely be found?

Group 1
Group 2
Group 12
Group 13

Answers

Answer:

Group 12

Explanation:

Answer:

I got all answers correct on my test and got 100%, this question was in the test which got correct

so your answer is group 12

Explanation:

How many joules are released when 30.0 g of H2O(g) condenses at 100°C and cools to 10°C

Answers

Heat released : 79086 J

Further explanation

Condenses :

1. phase change (gas - liquid) : heat of vaporization (ΔH vap for water = 2260 J/g)

2. cools from 100 - 10 : (Q=m.cΔT)

1. Q=m.ΔH vap

[tex]\tt Q=30\times 2260=67800~J[/tex]

2. Q=mc.ΔT(c water = 4.18 J/g C)

[tex]\tt Q=30\times 4.18\times (100-10)\\\\Q=11286~J[/tex]

Q tot = 67800 + 11286 = 79086 J

products or solutions found at home or in store and their characteristics

Answers

Answer:

bruh, just go in your bathroom and look for cleaning products

Explanation:

When light waves hit ice, most of them bounce off and radiate back into space. Because of this, ice is best described as which kind of surface? reflective absorbent dense rough

Answers

The bouncing back of light waves observed when light waves hit ice and most of them bounce off and radiate back into space is called reflection.

What are light waves?

Light waves are a form of waves which produces visible sensitization of the eyes

Light waves have properties of waves such as:

reflection refraction diffractioninterference, etc.

When light waves hit ice, most of them bounce off and radiate back into space.

This property of light waves is known as reflection.

Learn more about reflection of light waves at: https://brainly.com/question/1191238

When light waves hit ice, most of them bounce off and radiate back into space, hence, ice is best described as a reflective surface.

What is a Reflective surface?

A reflective surface is one which can cause incident light to bounce back (reflection).

According to this question, when light waves hit ice, most of them bounce off and radiate back into space. This means that most of the incident light reflects off the ice surface.

Therefore, the ice surface is best described as a reflective surface.

Learn more about reflection at: https://brainly.com/question/8553652

A boat sails into a bay and drops anchor. Several hours later, it is surrounded by mud. What
happened?

Answers

Answer:

the flow of the water pushed the mud around the anchor

Explanation:

The information regarding the mud should be explained below:

The following information should be considered:

In the case when it should be surronded by mud so there is low tide arise.it is occur at the time when the water retreats to its lowest level, moving away from the shore.

Learn more: https://brainly.com/question/5763151?referrer=searchResults

What is the mass of 1.34x10^24molecules of Iron? *

Answers

Answer:

Ion channel proteins allow ions to diffuse across the membrane. A gated channel protein is a transport protein that opens a "gate," allowing a molecule to pass through the membrane

Explanation:

What can you make with molecules

Answers

Answer:

water

Explanation:

Answer:

Explanation: Las moléculas se encuentran fuertemente enlazadas con la finalidad de formar materia. Las moléculas están formadas por átomos unidos por medio de enlaces químicos.

Given the following equation:
2KMnO4 → K2MnO4 + MnO2 + O2
How many grams of KMnO4 are required to produce
1.60 grams of O2?
g

Answers

Mass of KMnO4 required : 31.607 g

Further explanation

The reaction equation is the chemical formula of reagents and product substances  

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products  

Reaction

2KMnO₄ → K₂MnO₄ + MnO₂ + O₂

mol of O₂ :

[tex]\tt \dfrac{1.6}{16}=0.1[/tex]

mol ratio KMnO₄ : O₂ = 2 : 1

mol of KMnO₄ :

[tex]\tt \dfrac{2}{1}\times 0.1=0.2[/tex]

mass of KMnO₄ :

MW KMnO₄ : 158,034 g/mol

[tex]\tt mass=0.2\times 158,034 =31.607~g[/tex]

Hi.
Please i need help with these questions.
Please show workings.​

Answers

Answer:

see the pict for the answers

covalent compound formula for hydrogen monochloride

Answers

Answer:

HCl

Explanation:

1 hydrogen 1 chlorine

Bond energy needed to break or create bonds is measured in units called
A horsepower
B. calories
C. kilojoules
D. newtons

(Edit)
Correct Answer is "C"​

Answers

Answer:

C. kilojoules

Explanation:

The bond energy needed to break or create bonds is measured in units called kilojoules.

Bond energy is a form of enthalpy change of a reaction or physical change. The bond energy is the heat content of a covalent bond formed from its constituent elements in the gas phase.

The bond energy is the same in value as the bond dissociation energy and its unit is given in kilojoules.


When Earth is tilted on its axis why does it orbit the sun ?

Answers

Answer:

Here

Explanation:

Some assume our planet's changing distance from the sun causes the change in the seasons. That's logical, but not the case for Earth. Instead, Earth has seasons because our planet's axis of rotation is tilted at an angle of 23.5 degrees relative to our orbital plane, that is, the plane of Earth's orbit around the sun

Rock salt mixed with ice actually lowers the temperature of the salt/ice mix. Physical or chemical property?

Answers

Answer:

chemical

Explanation:

Salt changes the chemical makeup of the water and allows it to get colder than what it would normally freeze at.

If an element is on the 4th row of the periodic table...how many energy levels/rings would you need to draw a Bohr 's model of the element's atom?

Answers

Answer:

4 energy levels/rings

Explanation:

By the atomic model proposed by Niels Bohr, the electrons orbit around the nucleus in shells having different energy level each with the ability to contain a given maximum amount of electrons.

The closest shell to the nucleus named the K shell, can have a maximum of two electrons, the next shell known as the L shell can have 8 electrons while the next shell, M, can have a maximum of 18 electrons

The arrangement of the periodic table is based on the number and location of electrons such that elements in the 4th row (period 4 elements) have three completed energy levels/rings before, their valence ring making the total number of rings = 4 energy levels/rings.

6. Classify each compound as ionic or molecular based on its properties.

Substance Melting Point Solubility Conductivity Classification
1 -55 oC poor poor
2 396 oC good good
3 0 oC not tested poor
4 200 oC good good
5 20 oC good poor

Answers

Answer:

1.  c

2. ionic

3. c

4. ionic

5. alloy or ionic

Explanation:

The compound classification.

The compounds are classified as per several different criteria and one common elements is the specific element that is present this makes it an iconic or a molecular. The presence of the oxides, hydrides, and various atomic groups.

Hence the answer is melting point to conductivity classified as c, iconic, c, iconic, and alloy.

A poor conductor of electricity will have a conductivity classification of c. The 396 good conductors will be iconic and a 0 C not teste will have a conductivity of c. The 200 C of good conductor will be iconic and 20 C of good conductor will be alloy or iconic.

Learn more about each compound as.

brainly.com/question/3110085.

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