Science

Recent Questions

science
What will happen to the mass of the wood if you put them together without cutting them.

Earth Science
Explain how you could measure the density of a mineral with an exact amount of water and a scale .

engineering science
Two objects, with masses 10kg and 6kg respectively, move in the same direction in the same straight line at velocities 8m/s and 4m/s repectively, when they collide. The objects remain in contact with each other after collision. Calculate the common velocity and the direction ...

Earth science
A sphere was dropped into water in a graduated cylinder as shown in the following diagram.The water level rose th the new level shown .What is the volume of the sphere

science
Which of the follow comparisons would be an inaccurate analogy between prokaryotic cells and eukaryotic cells? A - A eukaryotic cell is like a college campus was a prokaryotic cell is like a one-room schoolhouse B - A eukaryotic cell is like a flip phone while a prokaryotic ...

earth science
If the earth was made 4.5 billion years ago, how comes we don't have any craters or rocks from that time?

Science
The flask shown here contains 10.0 ml of HCl and a few drops of phenolphthalein indicator. The buret contains 30ml of 0.130M NaOH. What Volume of NaOH is needed to reach the end point of the titration? I've used m1v1=m2v2, (x)(10.0ml HCl) = (0.130 M/L NaOH) (0.03L) and have ...

SCIENCE
A scientist observing a group of spider monkeys noticed that the adult females often spend time picking leaves off of tree branches. The scientist hypothesizes that this behavior is caused by boredom. Is the scientists hypothesis valid? A- no, emotions of non-human organisms ...

science 2 quick questions
1. Describe 2 methods of viral infection 2. How can a virus be helpful to its host? I don't want sites because they don't help, please help me and explain . All my other questions r done but I'm stuck on these 2.

To ANY SCIENCE HELPER URGENT
1. Describe 2 methods of viral infection 2. How can a virus be helpful to its host? Please this is very urgent, I have finished everything else but these r my last 2 questions that I don't know! Please help! Thanks:)

SCIENCE - PLEASE HELP PLESE
1) Round 578.683 m, 47.3333 kg, and 789.5 cm to four significant figures. 2) Find the weight of a 12.25 kg dog. Round your answer to the correct number of significant figures. Use weight=massxfree-fall acceleration. 3) Round 3155.24m, 8.777 73 cm, and 93.775 57 kg to one less ...

Environmental Science
India’s prime minister puts you in charge of that nation’s population policy. India has a population growth rate of 1.6% per year, a TFR of 2.7, a 49% rate of contraceptive use, and a population that is 71% rural. What policy steps would you recommend, and why? What do ...

To ANY SCIENCE HELPER
1. Describe 2 methods of viral infection 2. How can a virus be helpful to its host? Thanks:)

Need help badly, Science
Suppose the incident sunlight at ground level has a power density of 0.87 kW m−2 at noon. What is the maximum rate of loss of water from a lake of area 1.0 ha? (1 ha = 104 m2.) Assume that all the radiant energy is absorbed. any ideas on how do i get through with this?

computer science
Mr Ali has given a test to his class. He would like to have the average score for the class as well as the highest and lowest scores. Write a pseudocode to calculate and display these values. Then convert your pseudocode into a program by using any programming language of your...

Science
Suppose a geologist is studying two distinct areas next to a spreading ridge. The magnetic direction of the minerals in the oldest area is opposite to the magnetic direction of minerals in the newest area. a) Which area is closest to the center of the ridge, the older of the ...

Science
a car is moving at 80km/hr and slows down to 13km/hr in 9.75 seconds. Calculate the car's acceleration Formula for acceleration= Final speed-Initial/Time

Engineering science
A water pump produces 9KL of water per hour at a height of 70 m above the pump.The pump is driven by a 3 KW electric motor.calculate. 1) The work done per hour 2) The work done per minute

science
an empty truck with a mass of 3000 kg has a maximum acceleration of 1m/s2 .what will its acceleration be when it carries a load of 1000 kg?

Science-HELP?
A map of Florida is an example of a(n) ________. *I researched this a little bit and I thought it might be peninsula. Can someone verify this for me please? There aren't any choices either.

Science URGENT
Marquez is in the ocean on his surfboard. While waiting for the perfect ride, he notices that waves pass him about every 4 s. What is the frequency of the waves? A. 0.75 Hz B. 0.5 Hz C. 0.25 Hz D. 0.2 Hz

Science
Choose the explanation that does the following: (1) identifies the element used in carbon dating and (2) explains why the element is used. A. iodine-131; iodine is present in the thyroid glands, is radioactive, and has a very long half-life B. nitrogen-14; radioactive carbon ...

Science
Marquez is in the ocean on his surfboard. While waiting for the perfect ride, he notices that waves pass him about every 4 s. What is the frequency of the waves? 0.75 Hz 0.2 Hz 0.5 Hz 0.25 Hz

Science
Harold walked into his kitchen and noticed that the bowl of bananas he keeps in the corner had many fruit flies around it. When he reached the bowl, he noticed that one of the bananas had its peel partially pulled apart, and the fruit inside the peel had turned brown and a ...

Science
Your family is going to have a contractor build a pool in your backyard. Your mom wants to make this a learning experience, so she asks you to find the mass of the water that will fill the pool. She has told you that the pool holds 75,700 L of water, and you know that the ...

Science
I have two questions for 7th grade Science. I've been sitting here for a while, and I am behind in school work. Please Help. _____ is the practical use of scientific knowledge to solve everyday problems and improve lives ____ are used to make complicated concepts and systems ...

Science
The force of 100dynes acts on a mass of 50 grams for 10 seconds. Find the change in moentum

Science: Acids that affects the tooth enamel
I know phosphorus and amino acids has their roles with affecting the tooth enamel, but is there other acids that can help or destroy the tooth enamel? Thank You in advance.

science
which of the following is an example of an effect of natural selection. A. all of the children of two parents are male. B. carbon cycles through ecosystem. C. favorable environmental conditions cause an increased food supply. D. polar bears have white fur.

science
Why did a portion of the tabletop get cold when Natasha placed her cold drink on the table? (1 point) The table’s molecules were vibrating more slowly in that area. The table’s molecules had spread further apart in that area. The table’s molecules had gained energy in ...

science
what is the way that an organism either builds up or breaks down materials in the body for energy

science
what volume occupy 90g/

Science! URGENT
Bacteria can reproduce through asexual or sexual reproduction. Environmental conditions for a particular bacteria species are good and the bacteria are thriving. Which form of reproduction will the bacteria most likely use? A. The bacteria will most likely reproduce through ...

Science! URGENT
How might sexual reproduction decrease an organisms chance of survival? A. If the offspring inherits a genetic combination that includes a harmful trait, it could decrease the organisms chance of survival. B. If the offspring inherits the exact sane genetic information as its ...

Science! Help!!
What would happen if gametes were not haploid? A. If gametes were not haploid, the offspring would have half the number of chromosomes it is supposed to have. B. If gametes were not haploid, the offspring would have double the number of chromosomes it is supposed to have. C. ...

P5 Science
My full question. A leaf was plucked from the garden. The procedure for testing for starch in the leaf was carried out. Part of the leaf turned blue-black and part of the leaf just turned brown. Question : Why do you think the other part of the leaf did not contain starch?

P5 Science Energy
Please help me.... State the energy conversions in the maglev wind power station. ____energy(wind)-->_____energy(turbin​es)-->_____energy(generators)

P5 Science Energy
Part of the leaf that turned brown.

P5 Science - Energy
Need help.. Why do you think the other part of the leaf did not contain starch?

Science! Help!!
In pea plants, purple flowers are dominant over white flowers. Which Punnet square correctly shows the cross of a plant with white flowers and a plant that is heterozygous for purple flowers? A. Aa,Aa, aa, aa B. Aa,Aa, Aa,Aa C. AA,Aa, Aa,aa D. AA,AA, Aa,Aa Is the answer D?

Science! Help!!
Which of the following traits is acquired? A. The number of petals that grow in a plants flowers. B. The wing shape of a wild bird C. The ability of some gorillas to use sign language D. A cheetah's ability to run faster than any other land animal. Is the answer B?

science
the neuron that transmit the signal to your foot to kick a soccer ball are called reflexes motor neurons sensory neurons interneurons

science
the neuron that transmit the signal to your foot to kick a soccer ball are called reflexes motor neurons sensory neurons interneurons

Science
smallest unit that consists of at least one atom A. Protons B. Neutrons C. Electrons D. Molecules Im thinking D but im not sure i don't remember.

Science
Dust mites are microscopic bugs that are too small to see with a dissecting microscope. To see the details of a dust mite’s skin, which of the following microscopes would you use? A. dissecting microscope B. compound microscope C. transmission electron microscope D. scanning...

science
how much energy and joules are in bag of crisps?

science
what is function of the nucleons in a cell?

science
The energy of a mole of photons with frequency 6.00x10^14Hz is what in kJ?

science urgnt vry urgnt for exam purpouse
explain why sliding friction is less than static friction

Science
The gradient or slope of the distance time graphy at any pont gives

SCIENCE
If we decrease the distance an object moves we will decrease the amount of force applied. Decrease the amount of work done. increase the amount of force applied. increase the amount of work done.

science
Do all animals reproduce?

science Help
A long-haired cat (recessive trait s) is crossed with a heterocygous short-haired cat (dominant trait S). What percentage of their offspring will have long hair? A. 100 percent B. 50 percent C. 25 percent D. 0 percent Is the answer C?

science Help
In humans, having more than five fingers or toes is dominant over having exactly five finger or toes. Which of the following situations would most likely result in exactly half of a couple's offspring having six digits and half of them having five? A.Both parents are ...

Science
A piece of aluminum has a mass of 39.15g and a volume of 14.5cm cube. Determine the density of the aluminum. What would the density be of a much larger piece of aluminum? explain. I established the density of the al. is 2.7g/ cm cube. I don't get the second part of the question?

Science
Why might scientists first want to build and study a model of their proposed project?

Science
What microscope would you use to observe dust mite's skin?

Science! Help
In humans, having more than five fingers or toes is dominant over having exactly five finger or toes. Which of the following situations would most likely result in exactly half of a couple's offspring having six digits and half of them having five? A.Both parents are ...

Science
If the coordinates of points A and L are -4 and 8, respectively, then the midpoint between them has a coordinate of____ A- 0 B- 2 C- 4 D- 6 Please help me understand this!

Science! Help
In humans, having dimples is a dominant trait. If one parent has dimples and is homosygous for the trait, what is the probability any of his or her offspring will NOT have dimples? A. 100 percent B. 50 percent C. 25 percent D. 0 percent Is the answer D?

science Help
Which of the following describes the genotype and phenotype of parents whose child will definitely have a recessive trait? A. Both parents are homozygous for the recessive allele and have the trait. B. Both parents are homozygous for the recessive allele but do not have the ...

science Help
A long-haired cat (recessive trait s) is crossed with a heterocygous short-haired cat (dominant trait S). What percentage of their offspring will have long hair? A. 100 percent B. 50 percent C. 25 percent D. 0 percent Is the answer C?

Science Help
A long-haired cat (recessive trait s) is crossed with a heterocygous short-haired cat (dominant trait S). What percentage of their offspring will have long hair? A. 100 percent B. 50 percent C. 25 percent D. 0 percent Is the answer C?

Science Help
Which of the following describes the genotype and phenotype of parents whose child will definitely have a recessive trait? A. Both parents are homozygous for the recessive allele and have the trait. B. Both parents are homozygous for the recessive allele but do not have the ...

science Help
White skin (W) is dominant over yellow skin (w) in chickens. Which of the following genotypes would result in a white-skinned chicken that could possibly have yellow-skinned offspring? A. WW B. Ww C. ww Is the answer B?

Science
Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the density by ...

Science
An object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?¿???????????????

science
ind the molality of the solution obtained when 36.5 gram HNO3 is dissoloved in 750 gram water

Science
using an example explain how being able to understand scientific principles and think scientifically can help you solve problems and answer questions in your everyday life? Do you have any suggestions

Science--Help.
Which of the following is NOT one of the eight most common elements in Earth’s continental crust? carbon silicon oxygen aluminum The most abundant element in Earth’s continental crust (by weight) is _____. 2. oxygen silicon calcium iron 3. The central region of an atom is ...

Science
Which of the following units are in order from smallest to largest? a) Epoch, period, era. b) Era, epoch, period. c) Period, era, epoch. d) Epoch, era, period. True or False? Folding, as well as motion along faults, can change the position of rock layers and how they line up ...

science
calculate the number of moles inside a soap bubble 1cm in diameter and 1atm pressure at a temperature of 25 degree celsius.

Science
A controlled experiment is designed to test a ___. (1 point) control hypothesis theory** prototype Thanks I greatly appreciate it!

Science
suppose that you are walking down the street. Describe the force acting on you, and describe how they change your motion

Physical Science
Superfly, mass of only 1 gram, but capable of flying 840 million km/hr. meets a locomotive with a mass of 20,000 kg, traveling 40 km/hr. Who has the greater momentum? I know I need to convert mass to kg and covert momentum in Kg-Km/hr. I just don't know how. Please help.

Physical Science
Johnson ran the 100 meter dash in 9.79 seconds. Calculate Johnson's average speed, in meters/second.

science
An experiment was performed how the amount of coffee grounds could affect the taste of coffee. The same kind of coffee, the same percolator, the same amount a type of water, the same perking time, and the same electrical source were used. Identifying variables Independent, ...

integrated science
list nine digestive enzymes in the body plz answer fast thank u

science
A Scientist wonders if the amount of Vitamin C that he feeds to rats will have any affect on the rat's mass. He measured both the mass of the rats and the amount of vitamin C in grams. I need to find the Independent variable, Dependent variable and the controlled variable?

integrated science
what are atoms

Science
Explain the role of a hypothesis in a scientific investigation.

Science
In terms of energy, what is the difference between glucose and ATP?

Science
Explain how sunlight is the primary source of energy for your own life? Please help!

science
1.A melting glacier leaves behind _______ 2.One place to find large, moving _______ is in cold mountain areas 3. Glaciers scoop out _______ that can later fill up with water 4.The movement of some glaciers is helped by _____ 5.Climate change can affect the speed of a glacier's...

science
what is another path that a scientist might follow using the data from an experiment that did not support the hypothesis .

science 1 question
A student measures the volume of a liquid and finds it to be 40mL. How many significant figures are in the measurement? 1 2 3 4 I do not know if it is 1 or 2!??

Science
which of the following is a correctly balanced equation A.2Cu+O2--> 2CuO B.Mg + O2--> MgO2 C. 3KCI+HNO3-->3HCl+KNOW D. CaCO3---> CaO+CO3 answer b

Science(Energy)
Which of the following is the best example of transforming electromagnetic energy into thermal energy? A. when trees absorb sunlight for photosynthesis B. when the interior of a car absorbs sunlight and warms up C. when a solar panel absorbs sunlight to make electricity D. ...

science
make it right A lot of the rubbish we produce on land pollutes the park.

science
1.3 mol of calcium carbonate decomposed to calcium oxide and carbon dioxide. How many grams of calcium oxide is produced?

science
how do you covert 0.779 kl to l to ml to hl using the decimal method

science
If a certain gas occupies a volume of 20L when the applied pressure is 10atm , find the pressure when the gas occupies a volume of 5.0L

science
if the displacement of a particle varies with time as root of x= t+7, the a)velocity is inversely proportional to t b)velocity is proportional to square of t c)velocity is proportional to root of t d)particle moves with constant acceleration pls help...i have no idea how to ...

science
a ball is thrown vertically upwards from the top of a tower with a speed of 100 ms-1. it strikes the pond near the base of the tower after 25 seconds. the height of the tower is? a)500m b)125m c)625m

Environmental Science
What are some common justifications for environmental policy?

HELP IN SCIENCE ASAP!!
PLEASE CHECK ANSWERS!!

Science
If a car accelerate at 10m/s for 5 mins what is the is the change in speed

Science
Which of the following best describes the dependent variable in an experiment? A- the variable that is measured B- the variable that is manipulated C- the variable that you can see D- the variable that is most common (My guess is A) Photosynthesis is the process whereby plants...

Science(Magnets)
Should be easy, this. The two south pole ends of two magnets are touching. Which of the following can be concluded? A. No work was required by an outside force. B. The magnets are naturally attracted to each other. C. Work was required by an outside force. D. The potential ...

Science
Name the two compounds formed when ethane burns in an excess of oxygen

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