Science

Recent Questions

physical science
why a purple flower appears purple when white light shines on it.

Science
1.)which best describes a cave ecoystem?(1 point) A.)Plentiful food, widely varying tempature B.)Plentiful food , constant tempature C.)Very little food , widely varying tempature D.)Very little food, contant tempature i put D am im correct?

science, biology
1. What is/are the main factor(s) that determine(s) that your plants will grow into bean plants (or other fast-growing plants that you used for your experiment) and not some other type of plant (genetics, environment, or both)? Explain your answer.

science
A blood clot is composed of which of the following components? A. Platelets and fibrin B. Erythropoietin and thrombin C. Serum and albumin D. Fibrinogen and globulin

Science please help :)?
Which of the following happens when a low-mass star runs out of fuel? Choose all that apply. A. Its core becomes a white dwarf B. Its outer layers form a nebula, or vast cloud of gas and dust C. its outer layers expand, and the star becomes a red giant D. gas and dust in a ...

Science please help :)?
3. which if the following factors determines how long a star will live ? ( 1point ) A . star’s color b. the star’s mass**** c. the star’s diameter d. the star’s distance from the sun 4 . which of the following causes constellations to appear to move throughout the ...

science
name two ways that air gets heated

SCIENCE
2. which of the following happens when a low - mass star runs out of fuel ? choose all that apply . ( 3points ) A ITS CORE BECOMES A WHITE DWARF B ITS OUTER LAYERS FORM a nebula , or vast cloud of gas and dust c its outer layers expand , and the star becomes a red giant d. gas...

Science
1. how do scientists classify stars ? (1point ) A. by size , distance , and color b. by size , distance, and brightness c. by color , brightness, and distance d. by size , brightness, and temperature

Science
How will you triple volume of an ideal gas in value? Please explain your answer using the ideal gas law (PV = n RT). I figure that you simply multiply everything by three but Im not 100% that's correct.

Science
Factors that can be changed in an experiment

science
A person sits in a chair 3m from a wall on which hangs a plane mirror.Three meters directly behind him stands a woman 1.6m tall.What minimum height of plane mirror on the wall will enable him to see the woman's full height?

Science
Animals with nerve nets have: A:No specialized neurons B:Sensory neurons but n inter neurons C:Inter neurons but no sensory neurons D:Only motor neurons

material science, math
Calculate the ratio of the moments of inertia I1/I2 of two beams of rectangular cross section of the same width, one with a height h and the other, made up of three thinner beams of height h/3. I1/I2 = ?

science
If your primers are 25 bases in length and are located at position 520 and 1240 in your sequence, how big a PCR product do you expect? The location positions are for the 3' end of the primers.

physical science
why the speed of sound is faster in solids than in gases.

Science
1.)A couple has just learned that their daughter has hemophilia. They already have a son who does not have the disease. What are the genotypes of the couple? Explain your reasoning. ANWSER:They are both likely carriers of the disease, therefore they'd have the recessive gene ...

physical science
hermal conductors don’t have to be hot to transfer heat. According to Ch.16, explain a situation when an ice cube would still transfer heat to another object it is in contact with.

physical science
Explain how the snowboarder can have both kinetic and potential energy at point B.

Earth Science
Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial mineral? sulfur ...

Physical Science
Explain how you can use Boyle's law to determine the new volume of a gas when it's pressure is increased from 270 kPa to 540 kPa? The original volume of gas was 1 l. Assume the temperature and number of particles are consistent. What is the new volume?

physcial science
If a step-up transformer has a primary coil with 15 turns, how many turns would be required in the secondary coil in order to increase the voltage from 80 volts to 160 volts? A. 8 turns B. 30 turns C. 80 turns D. 160 turns

physcial science
A transformer has a primary coil with 600 turns and a secondary coil with 300 turns. If the output voltage is 320 volts, what is the input voltage? A. 8 volts B. 150 volts C. 640 volts D. 600 volts

physcial science
What creates a magnetic field? A. charged particles that do not move B. moving electric charges C. gravity D. an isolated magnetic pole

physcial science
A device that changes mechanical energy to electrical energy by rotating a coil of wire through a magnetic field is called a(an) A. transformer. B. generator. C. electromagnet. D. current meter.

SCIENCE HELP ASAP
1 . What is the major difference between ectotherms and endotherms? A. whether or not the animal builds nests on land B. whether or not the animal has been found on several continents C. whether or not the animal maintains a constant body temperature D. whether or not the ...

science
Red car is A. Blue car is B. The Blue car is slower than the A. The Red car starts at a starting point 40m behind the Blue at what point do they meet?

physcial science
Which of the following statements about Ohm’s Law is true? A. Increasing the voltage decreases current. B. Keeping the same voltage and decreasing resistance decreases the current. C. Ohm’s law relates power, current and resistance. D. To increase the current, decrease the...

physcial science
What type of current is produced by a battery? A. parallel current B. alternating current C. direct current D. potential current

physcial science
The type of current in your home is mostly A. direct current. B. alternating current. C. series current. D. produced by batteries.

Science
1.)Studies conducted in england during the industrial revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely expalanation for this difference in hieghts is a difference in A.)Nutrition B.)Family...

Science
Compute the number of grams if there are 10.7g of c2h6 in complete combustion

Science
The speed of a motorcycle increases from 10.0 km/hr to 50.0 km/hr in 9.0 seconds. What is the acceleration?

Science
What is the average for 4cm 5cm and 5cm

science
A solid spherical ball rolls on table. Ration of its rotational kinetic energy to its total kinetic energy.

science
Which of the following is an example of inbreeding? A) a farmer chooses the cos in his or her herd that produce he most milk and breeds only those cows. b) a farmer chooses the cows in his or herd that produces the most milk and breeds them with cows that get sick less often. ...

Science
What is the difference between the density of cold water and the density of hot water.. Explain using the particle theory of matter. Thank You......

SS HELP PLZ
Which statement describes the thinking of the enlightenment? A. The power of reason is more important. B. Scientific ideas must fit religious beliefs. C. Only god knows how the world works. D. Faith is more important than science plz help

Science
Which of the following factors does not vary between a fast-following river and a pond that receives no water input? a. oxygen levels b. salt concentration*** c. temperature d. fish species Plzzz help me:)

phPhysical Science
A bird flew16 km west in 5 hours, then flew 20 km east in 6 hours. What was the bird’s velocity?

Geo, Math lit, Life science, history
Which career will I be able to do if I study Geography, Mathematical literacy, Life sciences, History, English, setswana and life orientation

science
A circular hole of 150 mm diameter is to be punch out of a 2 mm thick plate. the shear stress needed to cause fracture is 400 Mpa. calculate the minimum force to be applied to the punch.

Statistics
At a certain university, 50% of all entering freshmen planned to major in a STEM (science, technology, engineering, mathematics) discipline. A sample of 36 freshmen is selected. What is the probability that the proportion of freshmen in the sample is between 0.475 and 0.580? ...

Science
Which has a higher gravitational potential energy a mango or a huge boulder falling from the same height with the same acceleration due to gravity

8th Grade Science
How do adaptations enable organisms to reduce competion for food and other resources PLEASE ANSWER BY 4 (50 MINS)

barberton tvet ,science
calculate the maximum height reached by the bullet

Computer Science
Convert the following binary numbers to decimal (6 points): 11111 101011 1101011 Convert the following decimal numbers to binary (6 points): 49 367 1023 Convert the following hex numbers to decimal (4 points): ACE 800 Convert the following decimal numbers to hex (4 points): 64...

gaya ,college science
Which one of the following is an alkaline earth element? a) carbon b)sodium c)zinc d)iron

science
a bullet leaves a rifle with a velocity of 200m/sec and strikes targt up to 4cm what velocity scould it have pierce the same block of wood up to 16cm?

Health science
Make lists of factors that makes your lives stressful and explain how each impacts your physical health and fitness. Please help I'm confused

Science
A block of mass m is placed on a triangular block of mass M Which in turn Placed on a horizontal frictionless Surface find the velocity of the triangular block when the smaller block reaches the bottom end

Science
1. True or False: If the net force of an object is 0 N, the forces are considered unbalanced. (True) 2. Which of the following forces causes a feather to fall slower than a blowing ball? gravity © rolling friction sliding friction air resistance 3. A small fish in the ...

science
For the monatonic gas in #3,estimate the momentum of the gas for a particle mass of 3x10^-4g

Science
Kendell wants to determine if there is a trend in air temperature changes during April. Which procedure should he follow?

science
I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon strikes a metal surface ...

science
A behavioral adaptation in which animals undergo a period of greatly reduced activity in winter is _____. A. clustes B. hibernation C. burrows D. estivation

science
Which of the following is the key factor driving cellular differentiation in the body? a. chemical gradients in the cellular environment b. expression of genetic coding c. rate of transcription d. cellular nutritional status B or C?

science
In evolutionary terms, RNA is thought to have preceded proteins and DNA. Which of the following provides the most convincing support for this hypothesis? a. there are more types of RNA than there are of DNA b. RNA can both store genetic information and act as an enzyme c. ...

life science
Using examples,describe predation,competition and symbiosis,explaining how each interaction influences the population size of the organisms involed.

Science
Which of the following bodies are the hardest to tell apart because they are made of similar materials ? a) dwarf planets and comets b) asteroids and comets c) comets and meteoroids d) asteroids and meteoroids***

science
An aircraft lands with an initial velocity of 85 m/s and decelerates at 9.0 m/s2 until it travels at 4.0 m/s. (a) Calculate the distance travelled along the ground by the aircraft as it decelerates. (b) How long does this deceleration take? (First decide which equations to use)

Science
A ball is thrown upward and returns to thrower hand in 12 seconds. What is speed with which ball is thrown and maximum height attained.

Science
I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon strikes a metal surface ...

Science
I have a metal sheet of indium, and when a uv light with a wavelength of 265 nm is shone on it the surface ejects electrons that have a kinetic energy of 8.31x10^-20 J per ejected electron. I'm asked to find the threshold frequency, I need to know how to find it.

science
Which of the following would be true for the charged particles below ?

science- physics
Two spheres are launched horizontally from a 1.1 m -high table. Sphere A is launched with an initial speed of 4.5 m/s . Sphere B is launched with an initial speed of 1.5 m/s . What is the distance that sphere A travels from the edge of the table? What is the distance that ...

science
is tap water a pure substance..?

Computer Science
Create an array to record the results of rolling a 6-sided die. The user determines the number of rolls. Output the results of each roll and the sum of all rolls. The rolls should produce a random integer from 1-6.

science
is a polyatomic considered a compound?

science
Fill in the blank with the word or phrase that best completes the statement or answers the question. 14. The scientific name for a plant that reproduces with flowers is a(n) (1 point) 15. At certain times of the year, the male sage grouse can be seen inflating the air sacs on ...

Science
Select the three terms that belong together. To do this, pick one term from each of the three sets. Set 1: intertidal zone, neritic zone, deep zone Set 2: moderate light levels, freshwater, temperature fluctuations Set 3: clams, squid, beavers A) intertidal zone, temperature ...

Science
Select the three terms that belong together. To do this, pick one term from each of the three sets. Set 1: intertidal zone, neritic zone, deep zone Set 2: moderate light levels, freshwater, temperature fluctuations Set 3: clams, squid, beavers A) intertidal zone, temperature ...

science
What are differences between molecule and compound?

science
how do endotherms stay warm. plz help me

science
Ethical conflict over cases of cross-border and multigenerational pollution is an example of a dispute relating to

science
Covalent compounds are bad conductors of electricity.Why?

science
what acceleraton would m2 in mass24 m/s2acceleratoin of an and m1 a force of 5n produces an acceleeration of 8m/s2 in mass

science
The concentration of sodium chloride in ocean water is on average 0.060 M. What mass of sodium chloride is present in 25 L of ocean water? How do I answer this question, I have no idea where even to start.

Science
Suppose you found a fossil of a clam shell what can you conclude about the once-living organism and how it became a fossil?

science
what are two consequences of spraying insecticides to get read of mosquitoes

science
Which variable in the following statement would be placed on the Y-axis of a graph? If the amount of light increases, then the plants will grow taller.

science
A cubic container full of hot water at a temperature of 90 °C is completely lagged with an insulating material of thermal conductivity 6.4x10-4 Wcm-1K-1 (6.4x10-2 Wm-1K-1). The edges of the container are 1.0 m long and the thickness of the lagging is 1.0 cm. Estimate the rate...

science
A heat engine draws 800J of heat from its high temperature source and discards 450J of exhaust heat into its cold temperature reservoir during each cycle.How much work does this engine perform per cycle?

science
does water ionize to hydrogen and hydroxide

Physical Science
What happens to the kinetic energy of a snowball as it rolls across the lawn and gains mass?

science
a crew of astronauts leaves earth on a Monday , lands on the moon on a Thursday. they and on the side of the moon facing away from the earth. on what day would the astronauts be able to see earth from the moon, explain

physcial science
8. which picture(s) would best represent atoms in the gas of a neon sign?

Science
which of the following includes the variables needed to demonstrate momentum A. mass and velocity B. mass and acceleration C. time and velocity D.velocity and acceleration I think the answer is A

Science
which of the following includes the variables needed to demonstrate momentum A. mass and velocity B. mass and acceleration C. time and velocity D.velocity and acceleration I think the answer is A

science
a boat starts sailing on monday 10:00 at harbour A and sail 600 km due north.later it turns due east for a further 420 km to reach harbour B on tuesday at 12:00.what is the total distance travelled from A to B

science
1.)Ovaries contain A.)Sperms & produce estrogen B.) Sperms & produce testosterone C.)Eggs & produce estrogen D.)Eggs & produce testosterone 2.)The testes produce A.)Sperm & estrogen B.)Sperm & testosterone C.)Eggs & estrogen D.)Eggs & testosterone 3.)After an egg is fertilized...

Science
Hi!I wished you can help me with my science fair project.I don't know what to do or which to pick.Please help me.Any suggestion?I'm a fifth grader by the way.I appreciate it a lot. Endless Thanks, Marie

Science
An air mass of 25°C with a dew point of 10°C has a starting elevation of sea level (0 meters) encounters a mountain range with a peak elevation of 3,000 meters above sea level. At what elevation is the Lifting Cloud Level?

science
Write down images formed by the following mirrors. a)concave b)convex c)plain mirror

science
A rock sample weight 60N on earth. what would be the weight of the same rock on moon?

science
A drop of mass 2.0 g falls from a cliff of height 1.0 km. It hits the ground with a speed of 50.0 m/s. The work done by resistive force is 1. -10j 2. -12.50j 3. -15.5j 4. -17.50j solution:- I think change in kinetic energy can give me work done. But how to get resistive force.

science
A drop of mass 2.0 g falls from a cliff of height 1.0 km. It hits the ground with a speed of 50.0 m/s. The work done by resistive force is 1. -10j 2. -12.50j 3. -15.5j 4. -17.50j solution:- I think change in kinetic energy can give me work done. B ut how to get resistive force.

science
what is the main difference between lava and magma?

Science
A hypothetical element has two main isotopes with mass numbers of 56 and 59. If 61.00% of the isotopes have a mass number of 56 amu, what atomic weight should be listed on the periodic table for this element?

Science - Physics
Find the x-component of vector v⃗ = (310 m/s , 45 ∘ above +x-axis).

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