3,287 Answered Questions for the topic Science

Science

11/14/14

I need help

What are some the ways you think department of natural resource is or not fulfilling their mission statement to "secure a sustainable future for our environment"?
Science

11/13/14

Which isotope of an element is the most abundant if you know the elements average atomic mass

Deternine which isotope of an element is the most abundant if you know the elements average atomic mass  
Science Properties

11/11/14

What is a chemical reaction and how is it related to the physical properties of matter.

Chemical equation: a short way to show a chemical reaction using symbols instead of words

how many square kilometres of algae farm would be needed?

A particular algae can be grown at a rate of 30 grams per square metre per day, producing 0.016 litres of biodiesel with an energy density of 9.8 kWh per litre. If it was necessary to produce... more

11/10/14

Calculate the energy cost (kWh/p/d)

Australia produces 20 megatonnes (Mt) of alumina every year, where each tonne requires 3.8 MWh of heat energy to produce. Calculate the energy cost (kWh/p/d) to produce alumina spread across the... more

11/09/14

Calculate the cost of the electricity consumed (in cents).

A 99 W lightbulb is switched on for 4 hours. Calculate the cost of the electricity consumed (in cents), if the electricity tariff is 25c per kWh.
Science

11/08/14

why do you see increase and decrease in the zebra mussels and the quagga mussels invasive species population

The question is a sciencce lab on investigative report.
Science

11/06/14

What would happen to the moon if I took a piece of it away and brought it to Earth?

This is not homework. Its just a question that I have been thinking about.
Science

11/06/14

1. Natalie performed the next experiment: • She measures 100cm3 of water and puts this into a beaker. • Then she adds a 1g indigestion tablet to the water. • Fi

1. Natalie performed the next experiment:• She measures 100cm3 of water and puts this into a beaker.• Then she adds a 1g indigestion tablet to the water.• Finally, she measures the change in... more
Science Genetics

11/06/14

After 30 cycles, calculate how much PCR product (in micrograms) could potentially be produced

 1 microgram of human genomic DNA is amplified in a PCR reaction using primers designed to amplify a 330 base pair fragment. After 30 cycles, calculate how much PCR product (in micrograms) could... more

11/05/14

Science and enzymes and yea

Explain what would happen if a reactant molecule with a different shape to the enzyme came in contact with the enzymes active site     I need need the answer ASAP  thanks dudes 
Science

11/03/14

Why it is easier for a person to float while swimming in the Great Salt Lake than it is at Lake Tahoe.

Explain the answer in a complete sentence please

10/30/14

Is 416 proportional to 52 explain

I think I will need help with math word problems and science and language art and I need dictionary 
Science

10/30/14

calcium , argon , sodium , nitrogen , oxygen , chlorine. which of these can become stable by losing 1 electron

science : atoms and assessment lesson 1
Science

10/29/14

what is photosynthesis?

I do not understand this!! Also What is a cellular respiration and how does it take place?   Please advise!!!   Jessica
Science

10/27/14

what is the formula for changed temperature

what is the formula for a changed temperature of water

10/25/14

Arts and Science / Evolution College Course Question

Hi,I'm in an Arts&Science 195 College Course and I have my final coming up My teacher wants "A 2000 word paper on the representation of evolutionary biology in a particular cultural text either... more
Science Math

10/25/14

9(2-w) using distributive property

Answer this using the distributive property  
Science Physics Education

10/22/14

Shirley Temple was curling her hair when she dropped the curling iron.

Shirley Temple was curling her hair when she dropped the curling iron. The curling iron fell 1.899 m to the floor. How long (in seconds) did it fall?
Science

10/19/14

IDENTIFY the benefits that space technology has provided for modern society.

Please help! I don't know this. And my mom is kind of getting upset about this. So please help me right away. Again right way! AND WHOEVER HELPS THANK YOU. Sorry about the caps. Just please help me

10/18/14

What is the average kWh/d per person in Sydney due to aluminium smelting?

Tomago aluminium smelter located near Sydney has a rated capacity of 520,000 tonnes of aluminium per year. The production of each kilogram of aluminium requires 15 kWh of primary energy to smelt... more
Science

10/17/14

If a machine does 100 joules of work over the course of 10 seconds, how much power is required?

I got this answer wrong on a test and I'm terrible at science so I was just wondering what the right answer was!

10/17/14

Express your answer in units of kWh/d.

Chickens require 0.075 kWh per day of energy (as feed) for each kilogram of animal, and 2/3 of an adult chicken is edible meat. The lifespan of a chicken is 50 days.What is the daily energy... more

10/14/14

Express your answer as a percentage.

Typical fresh water usage is approximately 150 litres per day per person. If all of this water came from a desalination plant with an energy cost of 4 kWh(e)/m3 what percentage would this be of the... more

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