How do plants vary in their efficiency at producing joules for human consumption?

11,228 results

science

How do plants vary in their efficiency at producing joules for human consumption?

Science

Ecology, Plants(Producers)? I was wondering if plants or producers vary a little or a lot in their efficiency at producing joules for human consumption? And could you suggest reasons for this variation?

Science

Ecology, Plants(Producers)? I was wondering if plants or producers vary a little or a lot in their efficiency at producing joules for human consumption? And could you suggest reasons for this variation?

Science/ECology

I do not fully understand this question... But just out of experience would you say that plants vary a little or a lot in their efficiency at producing joules for human consumption. And could you suggest reasons for the variation?

Biology

CAM (crassulacean acid metabolism) plants such as the cacti differ from standard C4 plants such as corn in which of the following ways? a. CAM plants minimize photorespiration whereas C4 plants do not. b. CAM plants use both mesophyll and bundle sheath leaf cells for ...

Environmental Science

23. During the period of human history known as the ____, human populations grew rapidly because of advances in farming methods. a. Industrial Revolution b. "Tragedy of the Commons" c. agricultural revolution d. hunter-gatherer period C? But it could also be A 25. Which major ...

physics

If 250 joules of work are performed by an engine using 600 joules of energy in 5 seconds, what is the efficiency of the engine?

chemistry

acetaldehyde Ch3Cho will decomposed into methane and CO according to Ch3Cho->ch4+Co at 450 C the rate consumption of Ch3cho is measured to vary with the concentrate of heliumCh3Cho raised to the power 1.5 with a Ch3Cho concentrate of 0.222 M ,the rate of consumption of ...

PHYSICAL

A SIMPLE MACHINE PRODUCE 25 JOULES, WHAT IS THE OUTPUT WORK FOR EVERY 50 JOULES OF INPUT WORK. WHAT IS THE EFFICIENCY OF THIS MACHINE?

The defects of ball mill

The Ball Mill faults: (1) work efficiency is low, the power consumption unit. (2) the ball mill barrel rotational speed is low (about 15 ~ 27 r/min), if you use ordinary motor that. The average all need equipped with expensive reducer. (3) grinding medium in the impact and ...

PHYSICS - PLEASE HELP

Converting sunlight to electricity with solar cells has an efficiency of 15%. It's possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. Each dish in the figure concentrates sunlight on ...

The defects of ball mill

The Ball Mill faults: (1) work efficiency is low, the power consumption unit. (2) the ball mill barrel rotational speed is low (about 15 ~ 27 r/min), if you use ordinary motor that. The average all need equipped with expensive reducer. (3) grinding medium in the impact and ...

Algebra

A machine has a work output of 28ax^5 joules and a work input of 7a^2x^6 joules. What is the efficiency of the machine?

Science

Please help me on my science homework....Motor A uses 1000 joules of energy to move 200 newtons of force a distance of 3 meters. Motor B uses 1200 joules of energy to do the same job. What is the difference in percent efficiency between Motor A and Motor B? Percent efficiency...

Literacy

Efficiency can best be defined as A. the amount of output generated in a given amount of time. B. producing items using the least amount of resources. C. using high-tech equipment on a job. D. producing as much as you can as fast as you can, regardless of cost. my answer is B

physics

GSM networks use microwaves of 20 cm in wavelength. The energy carried by one trillion (1012) photons of this wavelength is closest to ... a. 10^-16 Joules b. 10^-15 Joules c. 10^-14 Joules d. 10^-13 Joules e. 10^-12 Joules

Physics

GSM networks use microwaves of 20 cm in wavelength. The energy carried by one trillion (1012) photons of this wavelength is closest to ... a. 10^-16 Joules b. 10^-15 Joules c. 10^-14 Joules d. 10^-13 Joules e. 10^-12 Joules

Physics

(a) CO2 emissions C from a nation’s energy system can be expressed as: C = Population x Energy consumption per person x CO2 emissions per unit of energy consumption. Initially, total emissions are 600 million tonnes of CO2 per year. If, over a 50-year period, population ...

science

Which term does not describe one of the three categories into which land plants are classified? Seedless vascular plants. Nonvascular plants. Flowering plants. Seed plants.

Bio

Which term does not describe one of the three categories into which land plants are classified? Seedless vascular plants. Nonvascular plants. Flowering plants. Seed plants.

BUSINESS

EFFICIENCY MEANS PRODUCING USIN THLEAST AMOUNT OF

Human Growth

Which one of the following functions is not performed by the placenta? A. Combating internal infection B. Producing hormones that support the pregnancy C. Giving the developing baby immunity to various diseases D. Producing morphogens that cause cell transformation. I choose c...

physics

What amount of heat is required to raise the temperature of 20 grams of water from 10°C to 30°C? The specific heat of water is 4.18 J/g°C. 1200 joules 1500 joules 1700 joules 1900 joules 2000 joules

Economics

Problem #2: A Consumption Function: C = Co + MPC(Yd). Suppose that autonomous consumption is inversely related to the interest rate. It follows that as… a. interest rate falls, consumption falls b. interest rate rises, saving falls c. interest rate rises, consumption falls d...

chemistry

how do you convert joules to kilojoules? example: 2240.48 joules 3887.4 joules 13.85 joules

math

Lucy has 40 bean plants,32 tomato plants,and16 peppers plants.She wants to put the plants in rows with only one type of plant in each row.All rows will have the same number of plants.How many plants can Lucyput in each row

Physics

Mason lifts a box off the ground and places it in a car that is 0.50 meters high. If he applies a force of 8.0 newtons to lift this suitcase, what is the work done? A. 0 joules B. 4.0 joules C. 4.0 × 101 joules D. 4.0 × 102 joules

MCC

3. (Consumption and Saving) Supposed that consumption equals $500 billion when disposable income is $0 and that each increase of $100 billion in disposable income causes consumption to increase by $70 billion. Draw the graph of the consumption function using this information. ...

Stats

A company with two plants producing the same product, but with two slightly different manufacturing processes, conducted a sample study at each of the two plants with the following results: The sample statistics from the first group are: n = 40, x-bar = 18, s = 4.2. The sample...

chemistry

Acetaldehyde, CH3CHO, will decompose into methane and carbon monoxide according to CH3CHO (g) -> CH4 (g) + CO (g) At 450C the rate of consumption of CH3CHO is measured to vary with the concetration of CH3CHO raised to the power 1.5. With a CH3CHO concentration of 0.222M, ...

Science

Acetaldehyde, CH3CHO, will decompose into methane and carbon monoxide according to CH3CHO (g) -> CH4 (g) + CO (g) At 450C the rate of consumption of CH3CHO is measured to vary with the concetration of CH3CHO raised to the power 1.5. With a CH3CHO concentration of 0.222M, ...

Science

You go rock climbing with a pack that weighs 50N and you reach a height of 30m. How much work did you do to lift your pack? A. 80 joules B. 1500 joules C. 20 joules D. 1.67 joules

Econ

Whenever an industry fails to achieve allocative efficiency by producing too little output, a shortage arises.

physical science

if an engine must do 500 joules to pull a 10 kg load up to a height of 4 meters, what is the efficiency of the engines?

physics

In compressed state, a spring 3.00 meters long hanging from the ceiling has a potential energy of 2.0 joules. If the entire potential energy is used to release a ball of mass 1.2 kilograms vertically downward, then what is the kinetic energy of the ball when it reaches the ...

calculus

An automobile computer gives a digital readout of fuel consumption in gallons per hous. During a trip, a passenger recorded the fuel consumption every 5 minutes for a full hour of travel. time: 0 / gal/h: 2.5 time: 5 / gal/h: 2.4 time: 10 / gal/h: 2.3 time: 15 / gal/h: 2.4 ...

math

Amanda is decorating her new home and wants to buy some house plants. She is interested in three types of plants costing $4, $8, and $20. If she has budgeted exactly $96 for the plants and wants to buy exactly 12 of them, what are her options? Let x be the number of $4 plants...

Economics

Whenever an industry fails to achieve allocative efficiency by producing too little output, a shortage arises. What is wrong with this statement

math

Robots are being used with increasing frequency on production lines to perform manotonous task. To determine whether a robot welder should replace human welders in producing automobiles, an experiment was performed. The time for the robot to complete a series of welds was ...

Physics

A high efficiency natural gas furnace is 92% efficient. How many joules of output energy will 750kJ of input fuel provide? Please help! Thank you.

Economics

14. The life-cycle hypothesis and Permanent Income Hypothesis theories of consumption: A) are attempts to discredit the Keynesian consumption theory. B) believe that consumers do not have any autonomous consumption. C) assert that consumption is a necessity of life and does ...

Physics

What amount of heat is required to raise the temperature of 350 grams of copper to cause a 25°C change? The specific heat of copper is 0.39 J/g°C A. 2500 joules B. 2600 joules C. 3400 joules D. 3900 joules

science

the global water cycle provides renewable water, but a number of factors affect how much freshwater is available for human consumption. Describe these factors and circumstances. When do human interventions in water avaliabity pose serious problems to accessibility

7th grade math

there are 5 times as many tomato plants.in the gatden as there ate cucumber plants. the number of pepper plants is 7 more than the sum of the number of tomato and cucumber plants. there are 19 pepper plants in the garden. how many cucumber plants are there? how many tomato ...

science

if an engine must do 500 joules of ork to pull a 10 kg load up to a height of 4 meters what is the efficiency of the engine

English

identify the sentence in each group that contains a verb phrase . A. plants should be watered on a regular basis b. she wanted the plants regularly ***** c. he kept the plants indoors in the winter d. as a result , the plants remained warm and safe Pls help

physical science

if an engine must do 500 joules of work to pull a 10 kg load up to to a height of 4 meters ,what is the efficiency of the engine ?

Society and Tech

According to Joel Cohen, head of the laboratory of populations at Rockefeller University, the earth's carrying capacity for human populations depends upon: A. reducing meat consumption. B. eliminating social barriers to innovation. C. individual choices concerning consumption ...

Lanuage

What is subject-verb or pronoun-antecedent for this sentence: Not one of our tomato plants are producing any fruit, but the greenbeans are thriving.

Economics

consumption function, C=5+0.75*(Y-T). Y is,national income and T is government taxes. a What is the marginal propensity to consume? b If disposable income is 100, what are consumers' savings? c What form might a "consumption shock" take given the structure of this consumption ...

physics

A machine loses 600 kJ as waste heat while producing 5,350 kJ of useful energy output. The efficiency of this machine is

Physical Science

If an engine must do 500 joules of work to pull a 100 N load up to a height of 4 meters, What is the efficiency of the engine?

Math

green park is adding 236 plants this spring. One hundred fifty of them will flower. The rest will not flower. Use this information to answer question. 1) 1/3 of the flowering plants will have yellow flowers and 1/4 of the flowering plants will have white flowers. What fraction...

Science

The global water cycle provides renewable water, but a number of factors affect how much freshwater is available for human consumption. Describe these factors and circumstances. When do human interventions in water availability pose serious problems to freshwater accessibility?

science

The global water cycle provides renewable water, but a number of factors affect how much freshwater is available for human consumption. Describe these factors and circumstances. When do human interventions in water availability pose serious problems to freshwater accessibility?

physics

15 joules of work are done by forces other than gravity in taking an object from a position 3 m above the ground to a position 8 m above the ground. What is the change in the gravitational potential energy of the object? o A. It decreases by 5 joules. o B. It increases by 5 ...

science

an electrical energy supplied to a toy car was 240 joules.If the car weighing 40N moved through a distance of 5m,calculate the efficiency

marketing

How do consumption habits for products such as Scotch whisky vary from country to country? Why are some spirits products and brands strictly local, while some have global potential?

Science only one question...help plzz!

True or False: Plants continue to grow throughout their lives by producing new plant material. THANK YOU!

MATH/ SCIENCE-HELP

1) There is a total of approximately 12.4 billion acres of agricultural land (cropland, rangeland, irrigated land) on the major continents. Given that the average Net Primary Productivity (NPP) of agricultural land is approximately 2900 kcal m-2 y-1 calculate the annual global...

Science

Energy management has become a crucial field in increasing the efficiency of our everyday use of energy. One of the most energy consuming activities is the boiling of water. In order to understand the energy consumption, you need to have understanding on thermodynamics and ...

physics

A satellite circling the earth has an average power consumption of 370.0 W. Assuming 5.4% efficiency for conversion of solar energy to electrical energy, what area is required for the solar panels?

CALCULUS ECONOMICS

Consider a market in which consumption of the good being traded generates a positive externality. There are 100 identical consumers, each with a utility function given by (1/2)*(q^(1/2))+m +(G^(1/2)) where G denotes the total level of consumption in the market. The good is ...

Science

Plants continue to grow throughout their lives by producing new plant material. Photosynthesis is required for this process to occur. True or false? And explain why.

math

HELP PLEASE!!! ESPECIALLY PART 2 2. The following questions do not require the data above. Answer with the data given in each question. i. There is a total of approximately 12.4 billion acres of agricultural land (cropland, rangeland, irrigated land) on the major continents. ...

science

HELP PLEASE!!! ESPECIALLY PART 2 2. The following questions do not require the data above. Answer with the data given in each question. i. There is a total of approximately 12.4 billion acres of agricultural land (cropland, rangeland, irrigated land) on the major continents. ...

math

1) There is a total of approximately 12.4 billion acres of agricultural land (cropland, rangeland, irrigated land) on the major continents. Given that the average Net Primary Productivity (NPP) of agricultural land is approximately 2900 kcal m-2 y-1 calculate the annual global...

Physics

A system absorbs 1000 Joules of heat and delivers 600 Joules of work, while loosing 100 Joules of heat by conduction to the atmosphere, the change in the internal energy of the system will be. My solution. I used U=Q+A, and my answer was 1600, but its real answer is 300 Joules...

english

identify the sentence that contains a verb phrase 1-2 a. african violets are an excellent choice for an indoor garden b. these plants are relatively easy to grow c. they require very little natural light d. you can grow them with artifical lightning ** A. plants should be ...

Science

What is the probabilty of two tall peas plants, heterzygous for the tall ellele, producing a short pea plant.? A. 75% B. 50% C. 25% D. 0% Is the answer c?

economics

Consider a market in which consumption of the good being traded generates a positive externality. There are 100 identical consumers, each with a utility function given by 1/2 √q+m+√G, where G denotes the total level of consumption in the market. The good is sold by...

physics

a 70-kg man climbs a mountain 1200 m high (measured from the base) in 4 h and uses 9.8 kcal/min. calculate his power consumption in watts. what is his power output in useful work? what was the efficiency of this man during the climb?

Math

A family has two cars. The first car has a fuel efficiency of 40 miles per gallon of gas and the second has a fuel efficiency of 30 miles per gallon of gas. During one particular week, the two cars went a combined total of 1250 miles, for a total gas consumption of 35 gallons...

Math

A family has two cars. The first car has a fuel efficiency of 40 miles per gallon of gas and the second has a fuel efficiency of 30 miles per gallon of gas. During one particular week, the two cars went a combined total of 1250 miles, for a total gas consumption of 35 gallons...

math

A family has two cars. The first car has a fuel efficiency of 30 miles per gallon of gas and the second has a fuel efficiency of 25 miles per gallon of gas. During one particular week, the two cars went a combined total of 1275 miles, for a total gas consumption of 45 gallons...

Science! just one question! help ASAP plzzz

True or False: Plants continue to grow throughout their lives by producing new plant material. This sentence is __________ because…

English

1. Please water the plants while I am away. 2. Please water the plants while I am absent. 3. Please water the plants in my absence. 4.Please water the plants while I am not here. 5. Please water the plants while I am out. 6. Please water the plants while I am on a business ...

chemistry

- What fraction of an E coli cell is occupied by its DNA? How would I find the fraction? If I knew the volume of an E coli cell, would I divide that by the volume of DNA in an E coli cell? - A human cell is typically spherical with a diameter of 20 micrometers. Calculate the ...

science

For a machine with an efficiency of 80%, what is the work output of the machine if its work input is 2,000 joules? would i divide 2000/.80? which gives me 2500?

Economics

EconMacro4 Chapter 9 Aggregate Expenditures and Demand 7. A. What are the components of aggregate expenditure? Page 148 Add to the consumption function, investment, government purchases and net exports (C + I + G + (X-M). B. In the model developed in this chapter, which ...

statistics

The quarterly seasonal indexes for a firm’s electricity consumption are 115, 92, 81, and 112 for quarters I-IV. It has been forecast that electricity consumption will be 850,000 kilowatt-hours during 2008. Forecast electricity consumption for each quarter of 2008

CALCULUS ECONOMICS

Consider a market in which consumption of the good being traded generates a positive externality. There are 100 identical consumers, each with a utility function given by (1/2)*(q^(1/2))+m +(G^(1/2)) where G denotes the total level of consumption in the market. The good is ...

factors

Lucy has 40 bean plants, 32 tomato plants, and 16 pepper plants. she wants to put the plant in rows with only one type of plant in each row. All rows will have the same number of plants. How many plants can Lucy put in each row

BIOLOGY!!

Why do leaves of plants appear green to the human eye?

Social Studies

1. How did mechanization change the agricultural industry? (Choose all that apply. 1. it increased production of crops 2.it caused the cotton industry to decline 3.made dairy products safer to consume 4.caused a decrease in efficiency 2.which of the following are aspects of ...

science

The living plants that are most similar to the first plants to bear gametangia are the _____. a) charophyceans b) seedless vascular plants c) angiosperms d) gymnosperms e) bryophytes

Algebra 1

1. For the data in the table does y vary directly with x? If it does write an equation for the direct variation. x|y 8|28 16|56 20|70 a. yes;y=5x b. yes;y=x+20 c. yes;y=3.5x** d. no; y doesn't vary directly with x 2. For the data in the table does y vary directly with x? If it...

science

Plants perform photosynthesis and respiration. Dead plants are broken down and become part of the soil. Which of the following matter do plants help to cycle through ecosystems?

physics

A 500 kg dragster reaches a speed of 100 m/s on level ground, starting from rest. Its efficiency is only 8.00% in producing kinetic energy, because of friction and its design for high power without regard to efficiency. (a) How many gallons of fuel does it use during this ...

Science

Use specific data from your experiment to defend or refute the following statements: Plants continue to grow throughout their lives by producing new plant material. Photosynthesis is required for this process to occur.

biology

WHO WOULD WRITE A SUMMARY FOR ME :: THIS IS THE TITLE OF THE ARTICLE : YOU CAN FIND IT ONLINE "The relationship between the volume of antimicrobial consumption in human communities and the frequency of resistance"

physics

An object has a gravitational potential energy of 24 joules when it rests on a shelf 3 m above the ground. What would be its gravitational potential energy when it is lowered to a shelf 1 m above the ground? o A. 8 joules o B. 12 joules o C. 22 joules o D. 72 joules

budgets and forcasting

How are budgeting systems used to weigh the efficiency and effectiveness of a health and human service agency? Why is this important?

Algebra 1- A few questions, please help

**<--That means my answer choice 1. For the data in the table does y vary directly with x? If it does write an equation for the direct variation. x|y 8|28 16|56 20|70 a. yes;y=5x b. yes;y=x+20 c. yes;y=3.5x** d. no; y doesn't vary directly with x 2. For the data in the ...

Science

A scientist is testing the effects of fertilizer on peanut production. He plants 4 peanut plants and applies a different amount of fertilizer to each plant. Two of the plants die. Can he conclude that the amounts of fertilizer used on those plants were lethal? What other ...

english

identify the sentence that contains a verb phrase 1-3 a. african violets are an excellent choice for an indoor garden b. these plants are relatively easy to grow c. they require very little natural light d. you can grow them with artifical lighting a.too much light will ...

Math

Jill wants to put 45 sunflower plants, 81 corn plants, and 63 tomato plants in her garden. if she puts the same number of plants in each row and if each row has one type of plant, what is the greatest number of plants Jill can put in one row?

Physics

A laser used to weld detached retinas emits light with a wavelength of 652 nm in pulses that are 20 ms in duration. THe average power expended during each pulse is .600 W. (a) How much energy is in each pulse, in joules and electron volts? (b) What is the energy of one photon ...

science

Why do plants without vascular systems tend to grow small and close to the ground? A. Nonvascular plants get less food than vascular plants. B. Nonvascular plants lack structures that allow the plant to grow large. C. Nonvascular plants grow close to the ground because they ...

science

Why do plants without vascular systems tend to grow small and close to the ground? A. Nonvascular plants get less food than vascular plants. B. Nonvascular plants lack structures that allow the plant to grow large. C. Nonvascular plants grow close to the ground because they ...

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