# Science

## Recent Questions

science
when building a house, wich of the following is a simple machine that a construction worker would use? A)plywood B)safety hat C)cement D)pulley

science
remy noticed that after oiling his skateboard wheels,it was easier to reach the speeds he needed to preform tricks how did the oil help A) the oil reduced friction between the moving parts of the skateboard B)the oil increased friction between the moving parts of the ...

science
you do 185 J of work pulling a cart up a ramp. if the ramp does 153 J of work,what is the efficient of the ramp? A)82.7 percent B)121.0 percent C)32.0 percent D)338.0 percent

science
to chop wood you apply 50.0 N of force to an ax. the ax supplies 600.0 N of force to the wood. what is the mechanical advantage of the ax? A)650.0 B)8.3 C)12.0 D)0.0833

science
a box of cleaning supplies weighs 15 N. if the box is lifted a distance of 0.60 m, how much work i sdone? A)0.040 J B)9 J C)14 J D)25 J

Science
A car was travelling at the speed of 20m/s when the driver saw a cat on the road 40 m away. He step on the brake and the car came into a halt after 6 seconds. How far did the car travel. What will happen to the cat?

science
Define the photoelectric effect?

science
Depth of water in swimming pool is 1.5m. When we see from top the depth appears to be_.

maths
In a class, 22 offer maths, 21 offer English and 25 offer science. 4 students offer all three subjects and 36 offer exactly one subject. If all the students offer at least one of the subject, then how many offer two subjects?

science
calculate the moles of oxygen atom in 6.2 g of calcium carbonate?

science
Bacterium called pathogen. The example of a beaker with a single bacterium in it. That divides and doubles itself. If you place the first bacterium into the beaker, how much time it takes to half full? And how much time it takes to full? if we put a bacteria in 720 milliliter ...

Science
In what levels are producers and tertiary consumers, respectively found in an energy pyramid? I am kind of lost on how I am supposed to determine what level a producer is at on a pyramid? Can you please help me with this.

Science
Which level of consumer is an owl in the following chain: grass, cricket, mouse, and owl? I do not know understand this at all can you please explain this so I can get a better understanding of this?

Science
What factor is described when low water levels are causing animals to die from dehydration? I am confused on this. Please help. I don't even know where to begin looking

Science
What structure traps the pollen

science, pysics
A child having a mass of 37 kg sits 0.2 m from the center of a merry-go-round that is rotating with a period of 36 s. What is the centripetal force acting on the child? What is the centripetal force in Newtons?

physics, science!
A child having a mass of 37 kg sits 0.2 m from the center of a merry-go-round that is rotating with a period of 36 s. What is the centripetal force acting on the child? What is the centripetal force in Newtons?

physics, science!!!
A child having a mass of 37 kg sits 0.2 m from the center of a merry-go-round that is rotating with a period of 36 s. What is the centripetal force acting on the child?

physics, science
What centripetal force is needed to keep a 10 kg object moving at a constant speed of 10 m/s in a circle having a radius of 11 m?

Science
What is the average velocity of a car that moved 25 km east and 40 km wear in 2 hours

science
Which of the following set of terms could be used in a description of the peripheral nervous system? A)motor neurons and sensory neurons B) brain and spinal cord C)motor neurons and brain D) sensory neurons and spinal cord

Science
During a lunar eclipse, does the Moon enter the Earth’s shadow from the east or the west? Explain your answer. Wouldn't it be the east because that's the same way the moon rises normally? So if it normally rises in the east it would do that again.. or would it be west ...

science
what word can these letters make rorpsfgnloadeeas?

science
what do you think should be the motion of an airplane preparing for take off?

science
how will you describe the speed of the plane from the rest until it takes off?

science
Bacterium called pathogen. The example of a beaker with a single bacterium in it. That divides and doubles itself. If you place the first bacterium into the beaker, how much time it takes to half full And how much time it takes to full

physical science
two forces of 60 and 80 newton respectively act simultaneously at the point ...sketch and determine their resultant force using tail to tail method and tail to tail method

Science
Explain what Maria and craters are and how they formed.

Supportive learning environment
The ideal early childhood schedule for preschool children contains which of the following? A. Frequent changes in activities so children don't get bored B. A 45-minute circle time activity C. Integrated activities within a large block of time D. A specific time for each ...

Science
Hello again, I'm really sorry... We were learning about pH scales, bases, and acids. It was kind of hard in a way but it was alright, I'm kind of in the hang of it now. But this question really stumps me. "Why is it important for the pH of blood to remain constant?" My unsure ...

science
The orbits of planets being elliptical was one the planetary laws developed by ==A. Kepler. B. Brahe. C. Ptolemy. D. Copernicus. If a car travels from Town A to Town B on one road at different speeds and stops at red lights, knowing the distance between the towns and the ...

physical science
Look at the graph below measuring the speed of a truck and answer the following 2 questions: a) If the graph represents speed, what is measured on the x and y axes? You need to specifically identify which axis is which. b) Based on what the y axis measures, explain the motion ...

Science
Name 2 of each types of resources

math
John has \$20 to spend at a used bookstore. He wants to buy twice as many science fiction books as mystery books. Mystery books sell for \$1.25. Science fiction books sell for \$1.75. Tax is included in the prices. What is the greatest number of science fiction books that John ...

Science
The doctor ordered an IV infusion of NaCl at 125 ml/hr for the next 48 hours. THe drop factor for the IV tubing is 10. 1) calculate the gtts/min Answer: 23 gtts/min 2) calculate the total amount of IV fluid the client will receive in 48 hours. I got 6000 ml.... Anyone check ...

physical science
Look at the graph below measuring the speed of a truck and answer the following 2 questions: a) If the graph represents speed, what is measured on the x and y axes? You need to specifically identify which axis is which. b) Based on what the y axis measures, explain the motion ...

physical science
If you push a 900N refrigerator with the same force as you lift a 40N dumbbell, the dumbbell will move faster. which of Newton’s laws is this an example of? Explain how you know please. i know it's not the 3rd law.

science
I have completed a back titration with an antacid tablet weighing 1.25 mg and 0.1494 M concentration of HCL (100 mL was added) and the concentration of NaOH is 0.1422 M. Determine the concentration of HCl remaining in the volumetric flask

Science
How many molecules are in C6H12O6 or glucose?Need the answer by Feb-1-17. Thanks

science
I need help constructing a graph showing and predicting when two toy cars traveling at different speeds when the fast car can pass the slower car.The fast car traveled 1.5 meters in .87 sec.and .94 sec and .97 sec in three trials. The slow car traveled 1.5 meters in 1.1 sec ...

Science
Why do Oil & Water not mix? I'm so confused (This is just something I wanna know, no multiple choice) also, Ms. Sue, If you see this, Hi

Science
The (blank) has given scientists information about past life on Earth.

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Science
A train travelling north at a speed of 50km/h and another train travelling in the same direction at a speed of 8km/h.Calculate the resultant velocity.

Science
Predict when a fast toy car can pass a slower toy car . I marked off a distant of 1.5 meters and recorded the time it took the cars to reach the finish line. How do I create a graph and make a prediction? The fast car times were .87 sec. ,.94 sec. ,and .97 sec. the slow car ...

Science
By using different types of technology like satellites, radar, and river gauges, scientist can reduce flood damage and loss of life A:Models B:Automated weather systems C:Nonpoint sources D:Advanced warnings I think the answer is D. Thank you for your help.

Earth Science
What are the maximum and minimum dimensions (the size range) for the following particle sizes? a) cobble: b) pebble: c) sand: PLEASE HELP

Science
Suppose you are pulling a wagon with th handle at an angle.how can you make your task easier

7th G science
What is/are the main factor(s) that determine(s) the height of a plant (genetics, environment, or both)? Explain your answer. I think that only genetics play a role but I am not sure.

Science
A white eyed male Drosophila is crossed to a red eyed female all the resulting progeny have red eyes. A. This shows that eye colour is sex linked. B. This shows that eyes are recessive to white eyes. C. Both of the above. D. None of the above I think it is C. Am I right ? ...

science
n a cross between homozygous red-eyed "Drosophila" females and white-eyed males,? A. All the offspring will have white eyes or B. Ditto to A.> red eyes or C The male offspring will have red eyes and female offspring white eyes. I thin the answer is B or A Please help really...

Science
The surface r of a liquid depends on the density p acceleration due to gravity g nd height h use the method of dimension to derive the actual relationship between this quantities. An object is tie to the end of a string move in a circle the force exerted by the string depend ...

Science
A battery of 3cells in series each of emf 2v and internal resistance0.5 is conected to a 2resistor in series with a par

Science
If a tree lost all its leaves, is it dead?

Mathematics
Of the 82 pupils in grade 9, 73 take mathematics 56 take science, all those who take science take mathematics. Show the information on the venn diagram. How many take neither mathematics nor science?

Science
Starting from rest an airplane moves with a constant acceleration of 2m/s for 30 seconds before it takes off A. How far does it travel down the runway before it takes off ? B. What's it's final velocity ?

solar science physics
Consider a lead-acid battery with 500 Ah capacity and a rated voltage of 12 V. What is the total capacity of energy in watt-hours that can be stored in the battery?

solar science physics
Which of the following statements is NOT true about solar inverters? A stand-alone inverter is supposed to work as an AC voltage source for a specified range of AC loads. An ideal grid-tied inverter has its operational voltage and frequency synchronized with those of the grid...

English
Most of the following sentences lack at least one period, question mark, exclamation point, comma, semicolon, or colon. Add the correct punctuation where it is needed. I have added punctuation in second set of sentences. 1.African American author Maya Angelou read from her ...

science
What is the balanced molecular equation for titration of oxalic acid?

solar science physics
On the left-hand side of the figure below a III-V triple junction solar cell is shown. On the right-hand side, the J-V curves of the individual component cells and the multi-junction solar cell are shown. Which junction corresponds to sub cell 3?

7th G science
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 A. Genetics is the main ...

SCIENCE
In each of the following acid-base reactions, identify the Bronsted acid and base on the left, and their conjugate partners on the right: (a) HPO3 2- + HSO3 - → H2PO3 - + SO3 2- (b) C6H5NH3 + + OBr- → HOBr + C6H5NH2 (c) H2PO3 - + CH3CH2CO2H → CH3CH2CO2 - + H3PO3

computer science
write a program using pseudocode that give out the students grade after inputting his marks A*>=90 A>=80 B>=70 C>=60 D>=40 E>=30 U<30

science physics solar
A given monocrystalline silicon solar cell has the following specifications: Isc=5A Voc=0.6V 72 identical cells with the above specifications are to be interconnected to create a PV module. What is the open-circuit voltage (in V) of the PV module if all the solar cells are ...

science physics solar
In state-of-the-art crystalline silicon solar cells technology, based on p-type silicon, a back surface field (BSF) is implemented. This BSF is implemented, because in this way: The barrier for hole collection at the back contact is reduced, increasing the surface ...

solar science physics
In state-of-the-art crystalline silicon solar cells technology, based on p-type silicon, a back surface field (BSF) is implemented. This BSF is implemented, because in this way:

science physics solar
We have discussed that a bare crystalline silicon surface contains many defects which act as SRH recombination centers. How can the surface recombination at the air/n-silicon interface be reduced?

Science- Cells
what connection do you see between the nerve cell's structure and its functions?

Science- Cells
2 adjectives to describe each cell- nerve cell muscle cell bone cell and blood cell

Science - Geosystems
Please help me with these for 4 questions on my Geosystems homework. 1) Mass movements are classified based on _________. A. their speed and moisture content B. the type of destabilizing event C. whether or not a geomorphic threshold was crossed D. the steepness of the slope 2...

Science
Two drivers start at the same time to make a 100- km trip. Driver 1 takes 2 hrs to complete the trip. Driver 2 Thames 3 hrs, but stops for an hour at the halfway point. Which driver had a greater average speed for the whole trip? Explain

biology
1)Can you suggest reasons why a phylogeny based on molecular evidence and a phylogeny based on morphology and other evidence might not be exactly the same? 2) Zoologist worldwide are sequencing a mitochondrial gene CO1 (cyctochrome c oxidase subunit), which is found in all ...

Science
How much volume of co2gas is car obtained at NTP by heating 200gm calcium carbonate?

Which of the following statements are true A-Biodiversity provides additional resources that raise the carrying capacity of an ecosystem** B-Biodiversity increases and ecosystems ability to withstand changes C-Biodiversity makes an ecosystem more difficult to destroy D-...

Science
Please, how many atoms of carbon, hydrogen, and oxygen are in C3H8+502? (I know that C has 3, H has 8, and O is 10, am I correct?) - Jay A.

Art
Which statement best describes the difference between preservation and restoration? 1. Preservation is lengthy while restoration is relatively quick. 2. Restoration involves chemicals, while preservation uses special containers. 3. (Preservation is a highly complex science; ...

science
Number+Number+Number=0 use this nos1,3,5,7,9 11,12,15,

science
How many moles are in 44 grams of cao (ca=40,o=16)

science
Free ears in dogs are controlled by dominant allele (F), and attached ears are controlled by the recessive allele (f). In addition, Short dogs is due to a dominant allele(S), and long hair is due to a recessive allele (s). Which of the following is the genotype of the dogs ...

science
When hydrochloric acid reacts with sodium sulfide, hydrogen sulfide gas and sodium chloride are produced. How many moles of H2S will be generated by 2.56 moles of HCl? 2HCl + Na2S → H2S + 2NaCl

Science
Sasi asked her father to fix mirrors on her new house for elevation. But het father did not accepted? Imagine why he said like that?

Science
What best describes Newton law of universal gravitation

Science
The time interval between a lightning flash and the first sound of thunder was found to be 5 second.If the speed of sound in air is 330 ms-1,find the distance of the hash from the observer

science
Given that 25ml of a solution contains 159g of sodium carbonate per dm3 was required for complete neutralization of 4.725g of monobasic acid at s.t.p. (Na=23, C=12, O=16, molar gas volume at s.t.p=22.4dm3) . find the relative molecular mass of the acid and the volume of carbon...

material science
A syntactic foam is made by mixing thin-walled hollow glass spheres (radius, r, and wall thickness, t=0.05r) into an epoxy resin, which is then cured and hardened. The glass from which the spheres are made is twice as dense as the hardened resin. If the spheres are identical ...

material science
Honeycombs with negative values of θ have negative values of Poisson's ratio for loading in the plane of the cells.

material science
Derive an expression for the relative density of a regular hexagonal honeycomb made by the expansion process.

material science
Derive an expression for the relative density, ρ∗/ρs, of an anisotropic honeycomb with hexagonal cells:n which the vertical cell walls are of length h, the inclined cell walls are of length l, the angle between the horizontal and the inclined members is θ, and the cell ...

science
Conversion of energy from one form to another usually releases what

AP Environmental Science
I'm confused about how to do these problems, I thought I was doing it right, but I think I might be wrong. The Honda Civic Hybrid is a compact car. It gets a combined highway and city fuel efficiency 17.8 kilometers per liter (42.0 miles per gallon). Calculate each of the ...

Science
Which of the following illustrates how fossil fuels can be conserved? A.) driving more frequently B.) developing more coal-burning power plants. * C.) reducing electrical use Can someone check this please?

Science
What will be the mass of water if 5gms of hydrogen and 8gms of oxygen react with each other?

my answer has the **** 1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom***** c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point) a. Nucleus b. Neutron c. Proton d. Electron*** 3. Who provided the first evidence ...

Science
The fruit of an oak tree is called an acorn. You observe a squirrel gathering and burying acorns. Several months later, you observe an oak seedling growing in the area where the squirrel buried an acorn. What conclusion can you draw about oak tree reproduction from your ...

physical science
How much heat is absorbed by a 30g iron skillet when its temperature rises from 24oC to 93oC? Joules do i addition everything?

Science
A football player makes a tackle to stop a touchdown.What will happen to the offensive player?What law of motion applies and why?

Science
A car is moving down a straight road.Suddenly a cat jumps in front of the car.The driver slams on the breaks and the passenger goes flying forwards.Why?What law of Newton applies to this situation?

science
what is the relationship between mass and gravitational potential energy?

integrated science
Two individuals on roller blades push off each other.One weighs 45 kg and the other weighs 40 kg.who will travel further and why.Is the force balanced or unbalanced