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March 29, 2015

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Recent Science Questions

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science
A golf ball leaves the club 35m/s at an teta of 35 degree above the horizontal . Find a) range b) maximum height reached c) time of flight
Wednesday, February 11, 2015 at 6:41am

science
Through which are the chromosomes, transmitted according to the path of transmission of factors from the parental generation to offspring's as indicated by Mendle? (1) hereditary chapters (2) evolution (3) heredity (4) gametes
Wednesday, February 11, 2015 at 3:02am

science
Through which are the chromosomes, transmitted according to the path of transmission of factors from the parental generation to offspring's as indicated by Mendle? (1) hereditary chapters (2) evolution (3) heredity (4) gametes
Wednesday, February 11, 2015 at 12:18am

Science
What is the same in two isotopes of an element? What is different?
Tuesday, February 10, 2015 at 9:53pm

Science
What is te same in two isotopes of an element? What is different?
Tuesday, February 10, 2015 at 9:51pm

science
what are some experimental uncertainties for the period of a pendulum lab. in this lab we tested if the length of the string (cm) affects the period (sec) of the pendulum
Tuesday, February 10, 2015 at 8:40pm

science
what type of eclipse would you expect to see if the moon passes directly between earth and the sun
Tuesday, February 10, 2015 at 6:09pm

Science
Select the three words that belong together. To do this, pick oneword from each three sets below. Set 1. Estuary, lake, nertic zone Set 2. Hight salt, intermediate salt, no salt Set 3. Trout, coral, oyster (Choices) 1. Neritic zone, intermediate salt, oyster 2. Lake, no salt, ...
Tuesday, February 10, 2015 at 1:47pm

science
1) The force of gravity on the moon is 1/6 the force of gravity on earth. If you had a 1 kg box of cereal on earth which had a weight of 2.4 N, what would its mass be on the moon? why? 2) what is the volume of a textbook with dimensions 21.3 cm, 27.5 cm, 2.9 cm? please help me...
Monday, February 9, 2015 at 8:52pm

science
What happens when a charged object (plastic) is brought close to another oppositely charged object (glass).
Monday, February 9, 2015 at 8:42pm

science
is this an open or closed system? baking soda reacting with vinegar
Monday, February 9, 2015 at 6:43pm

Basic science
What is the uses of (caco3)
Monday, February 9, 2015 at 4:53pm

science
the process in which an animal's cells use oxygen and digested food molecules to release the energy in food is called 1. breathing 2. cellular respiration 3. diffusion*** 4. gas exchange
Monday, February 9, 2015 at 3:37pm

science
A marathon race is 26.22 miles. How many kilometers do the runners run?
Monday, February 9, 2015 at 9:22am

engineering science n2
A stone with a mass of 6kg is thrown vertically upwards from the top of a building 35m high with a starting velocity of 20m/s. The time it will take to reach its maximum height
Monday, February 9, 2015 at 5:04am

Science
I am reviewing for a test and I don't know how to attempt this question. Could someone please work through this problem and then have the general steps that I need to take to solve the question? Here is the question: A rocket expels gases at a rate of 1.30 x 10^3 kg/s with...
Monday, February 9, 2015 at 2:17am

science
i need help with a reason for the season science lab of how earth orbits sun
Sunday, February 8, 2015 at 11:45pm

Science
I am reviewing for a test and I don't know how to attempt this question. Could someone please work through this problem and then have the general steps that I need to take to solve the question? Here is the question: A rocket expels gases at a rate of 1.30 x 10^3 kg/s with...
Sunday, February 8, 2015 at 11:10pm

History
Which of the following types of institutions played a significant role in supporting and disseminating scientific knowledge in the 17th Century? (choose all that apply) a. scientific journals b. royal academies of science c. coffeehouses d. research universities
Sunday, February 8, 2015 at 5:21pm

science
write the formulea for combining sodium and water balance the equation
Sunday, February 8, 2015 at 4:53pm

Science
What are some effects of predation?
Sunday, February 8, 2015 at 3:33pm

science
an electric water pump raises 500 kg of water through a vertical height of 25 m in 50 sec. Calculate the power of electric pump. Take g=10N/kg
Sunday, February 8, 2015 at 12:34pm

science
A nail is driven into a board with an initial kinetic energy of 150 j. If the potential energy before and after the event is the same, what is the change in the internal energy of the board and nail?
Sunday, February 8, 2015 at 11:27am

Maths, consumer studies, CAT, life science,
Which careers can i persue with those subjects?
Sunday, February 8, 2015 at 8:33am

science
A solution of 0.200M NaOH (14.0 mL) is mixed with 42.4 mL of 0.170M HNO3. Assuming the final volume is the sum of the initial volumes, what is the molarity of Na+ cation and NO3- anion? I do not know where to start to solved for the molarity of the ions. Please help !
Saturday, February 7, 2015 at 10:15pm

Science
a child mass m slides down a slide 5 m high. the child speed at the bottom of the slide is 3 meters per second. what is the percent of mechanical energy the child has at the top of the slide. converted to kinetic energy
Saturday, February 7, 2015 at 8:21pm

Physical Science
Here are some half-lives for different isotopes of bismuth (Bi): Bi-211 — 2.1 minutes Bi-212 — 60.6 minutes Bi-213 — 45.7 minutes Bi-214 — 19.9 minutes If there are 200 grams of one isotope of bismuth, and after 60.6 minutes there are 100 grams of bismuth, ...
Saturday, February 7, 2015 at 6:23pm

Engineering Science N4
An aircraft is at A and has to drop a bomb on target B. If the aircraft flies at 720km/h at a height of 2km, calculate how ahead from B the bomb will to be dropped.
Saturday, February 7, 2015 at 5:17pm

science
what are the different types of infections that Ecoli causes?
Saturday, February 7, 2015 at 3:01pm

Science
1.What is the genetic code? (1 point) The order of amino acids in proteins makes up the genetic code. The order of amino acids in mRNA makes up the genetic code. The order of nitrogen bases in tRNA makes up the genetic code. The order of nitrogen bases in DNA makes up the ...
Saturday, February 7, 2015 at 12:29am

Science
California's volcanoes formed as the result of what type of plate boundary?
Friday, February 6, 2015 at 10:59pm

Science
To determine the acceleration of an object moving in a straight line, you must calculate the change in its stored during each unit of A. Velocity. B. Time. C. Motion. D. Deceleration. Is the answer B? Thank you
Friday, February 6, 2015 at 9:30pm

Physical science
A 70-kg man and a 50-kg woman are in a 60-kg boat when its’ motor fails. The man dives into the water with a horizontal speed of 3 m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1 m/s? If not, can the woman ...
Friday, February 6, 2015 at 9:52am

Maths, Life Science, Geography, Business Studies
What career opportunities are open for me regarding the above subjects?
Friday, February 6, 2015 at 5:57am

Science
Given the following balanced equation, determine the rate of reaction with respect to [O2]. 2 SO2(g) + O2(g) → 2 SO3(g)
Thursday, February 5, 2015 at 9:56pm

Science
If the concentration of AgCl drops from 1.000 M to 0.655 M in the first 30.0 s of the reaction, what is the average rate of reaction over this time interval?
Thursday, February 5, 2015 at 9:55pm

science
A healthy human body maintains a temperature of about 37.00C. Explain how physical, chemical and nuclear processes all contribute, directly or indirectly, to keeping the human body at a constant temperature.
Thursday, February 5, 2015 at 8:40pm

science
A 4.50 g mass resting on a horizontal, frictionless surface is attached to one end of a spring; the other end of the spring is fixed to a wall. It takes 3.6J of work to compress the spring by 13.0 cm. If the spring is compressed, and the mass is released from rest. find a) the...
Thursday, February 5, 2015 at 8:32pm

Science
Does air pressure affect species survival?
Thursday, February 5, 2015 at 5:29pm

Science
2. Express your opinion about which of all the suggested ways of dealing with antibiotic resistance you think are the most important to pursue, support your opinions with reasons. I think this, don't use any antibiotics unless it's your only option, and if you have ...
Thursday, February 5, 2015 at 4:11pm

Science - chemistry
Hi Im in year 7 and to get a level 6 we have to explain the big idea of energy. Our project is about the reation of iron and sulphur to make iron sulphide. We have been told to explain using the big idea of energy. pls help me asap!!!!
Thursday, February 5, 2015 at 3:56pm

Science
List some of the atmospheric conditions that might be described as weather? What is the purpose of weather on the earth?
Wednesday, February 4, 2015 at 10:25pm

Science
Why would a foam cup of hot cocoa stay hot
Wednesday, February 4, 2015 at 7:06pm

materials science
what are the two sources of electricity on the atoll of utrik that are not based on fossil fuels?
Wednesday, February 4, 2015 at 6:46pm

science
an object was placed into a container of water. the arrow shows that thermal energy is flowing from the water to the object. what is a valid conclusion
Wednesday, February 4, 2015 at 6:22pm

Science
Which of the following statements is true about a collision between two cars in the absence of outside forces? A. The total momentum after the collision is the same as the total before the collision. B. The total momentum after the collision is greater than the total momentum ...
Wednesday, February 4, 2015 at 5:45pm

science
which of the following could not have happened as a pot of water boiled on the stove?(1 point)
Wednesday, February 4, 2015 at 5:27pm

Science
1)What is the relationship between inertia and mass? 2)Jellyfish sometimes squeeze in the side of their bodies.This pushes a stream of water from the back end of their bodies,according to newtons third law of motion,How will this behavior affect the movement of the jelly fish...
Wednesday, February 4, 2015 at 4:58pm

Science
After an avalanche, a huge block of stone slid down a mountain and landed in the middle of the road. People in the nearby town had a very difficult time moving it out of the road. The block of stone is difficult to move because A. It has a high amount of momentum. B. Has ...
Wednesday, February 4, 2015 at 1:58pm

math lit, geography, life science,business studies
hey there! what career can do with math lit, geography, life science and business studies?
Wednesday, February 4, 2015 at 1:51pm

Science
Which the following describes the relationship between mass and inertia? A. When there. Is more mass, there is less inertia. B. When there is less mass, there is more inertia. C. When there is more mass, there is more inertia. D. When there is no mass, there is more inertia. ...
Wednesday, February 4, 2015 at 1:45pm

Science
According to Newton's third law of motion, if a rolling ball collides with a wall and exerts a force of 3 N on that wall, how much force does the wall exert back on the ball? A. 0 N B. 3 N C. 6 N D. 9 N Is the answer b?
Tuesday, February 3, 2015 at 11:13pm

Science
Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s? A. A 71 kg lion running at 10 m/s. B. A 45 kg zebra running at 13 m/s. C. A 5,000 kg elephant walking at 1 m/s. D. A 61 kg zebra running at 8.0 m/s. Is the answer C? Thank you
Tuesday, February 3, 2015 at 10:45pm

Science
Jellyfish sometimes squeeze the sides of their bodies. This pushes a stream of water from the back end of their bodies. According to Newton's third law of motion, how will this behavior affect the movement of the jellyfish? A. The jellyfish will move forward. B. The ...
Tuesday, February 3, 2015 at 10:30pm

Science Project on African Elephant
What are the physical and behavioural adaptations of an african elephant with the danger and extinction of the african elephants????
Tuesday, February 3, 2015 at 10:22pm

Science
Which of the following describes the relationship between friction and inertia? When there is more friction, there is less inertia. When there is less friction, there is more inertia. When there is more friction, there is more inertia. When there is no friction, there is more ...
Tuesday, February 3, 2015 at 9:28pm

Science
long wings are dominant to short wings in fruit flies. make a punnett square to show the predicted outcome of a cross between two parents that have both alleles for wing length. what is the ratio of flies produced?
Tuesday, February 3, 2015 at 9:06pm

Science
What is the momentum of a 20.0 kg scooter traveling at 5.0 m/s? A. 4.00 kg m/s B. 20.0 kg m/s C. 25.0 kg m/s D. 100 kg m/s Is the answer D? Thank you
Tuesday, February 3, 2015 at 8:43pm

Science Fair Project
Please help any tutors around, i really need help on what topic to choose, and my science fair is in February 16, 2015!!!!!! I just want to get a really good mark so i get an A in Science again this year in my report card. From a Student in need!!!Wimbika
Tuesday, February 3, 2015 at 8:39pm

Science
Suppose the total momentum of two masses before a collision is 100 kg m/s. What is the total momentum of the two masses after they collide? A. 0 kg m/s B. 50 kg m/s C. 100 kg m/s D. 200 kg m/s Is the answer D? Thank you
Tuesday, February 3, 2015 at 8:25pm

Physical Science
Identify these functions galvanometer step-up transformer electric motor generator electromagnet step-down transformer commutator
Tuesday, February 3, 2015 at 5:24pm

science subject
write the structural formula of 2-methylpropane.2,2-dimethylpropane.1,2-​dichloroethane.2-chloro-3-methylpentane.​2-chloro-2-iodopropane.3,4,4-trimethyl-5​-proplynon-2-ene.
Tuesday, February 3, 2015 at 5:14pm

science 1 question
In which way does the circulatory system rely on the skeletal system? A. Glucose is secreted by compact bone as an energy source for blood. B. Spongy bone stores minerals needed by blood cells. C. Bones provide a source of oxygen to blood. D. Blood cells are produced in bone ...
Tuesday, February 3, 2015 at 3:18pm

Earth Science
1.   What term is used to describe the process by which agents are carried from one place to another because of erosion?  A. Disposition B. Deposition C. Reposition D. Transplantation B?
Tuesday, February 3, 2015 at 3:14pm

Science
Two forces of 5N and 12N respectivley act on the same point. Show how you would determine the Magnitude of the resultant by using the Tail to head and Tail ti Tail methods and pythagoras theoram (13N)
Tuesday, February 3, 2015 at 3:02pm

Computers
1. What does the term "fair-use exception" mean? (1 point) to use only material that has never been published the ability to use material made by others for educational purposes an exception to copyright restrictions for images only Educational material is no longer ...
Tuesday, February 3, 2015 at 12:41pm

science
Define buoyancy.state the factors on which buoyant force depends?
Tuesday, February 3, 2015 at 1:03am

science
Give five reasons to prove that labio rohita (rohu) is a chordate.
Tuesday, February 3, 2015 at 1:00am

science
'classification of life forms is closely related to their evolution'.justify this statment with the help of examples.
Tuesday, February 3, 2015 at 12:57am

science
With the help of a labeled diagram describe in brief the rutherford's alpha particle scattering experment. Write three important conclusions drawn frm the expirment.
Tuesday, February 3, 2015 at 12:48am

science
In a water tank,on throwing a stone 20 full ripples are produced in 1 sec.the distance a crest and a through is 10 cm.calculate: (a) the wavelength of ripple (b) frequncy of ripple (c) velocity of the ripples.
Tuesday, February 3, 2015 at 12:39am

science
Define the following and give sl unit each: (a) power (b) work done (c) kinetic energy
Tuesday, February 3, 2015 at 12:19am

science
Shubham lives in avillage,where drinking water facilites are very limited.they collect drinking water from a pond people also bathe and wash their clothes in that pond.he observed the most of the people are suffering from diarrhoea he advised people to use chlorine tablets in ...
Tuesday, February 3, 2015 at 12:10am

science
In a chemical reaction,10.g of sodium carbonate reacted with 12 g of ethanoic acid.the poducts were 4.4g carbon dioxide,1.8g of water and 16.4g of sodium ethanoate. (a) write a word equation ,clearly showing the reactants and products as given above. (b) also show that this ...
Monday, February 2, 2015 at 11:54pm

science
Istopes are useful in many ways.write any three applications of istopes in various fields.
Monday, February 2, 2015 at 11:46pm

science
Number of electrons in the outermost m shell of an element is 3.find its atomic number.
Monday, February 2, 2015 at 11:37pm

science
A sample of certain mass of a gas was collected and it was found that the number of atoms and the nuber of molecules in the collected sample are equal.find this observation infer the type of molecules of the gas.
Monday, February 2, 2015 at 11:35pm

science
A sample of certain mass of a gas was collected and it was fond that the number of atoms and the number of molecules in the collected sample are equal.from this observation infer the type of molecules of gas.
Monday, February 2, 2015 at 11:27pm

science
A solid of relative density 1.25 is found to weigh 12 g in water.find its weight in air.
Monday, February 2, 2015 at 11:22pm

science
Using your reaction time, estimate the diestance a car would travel at 20m/s (45 mi/h) before you could apply the brakes. To get the deistance in meters you multiply the speed in m/s by your reaction time in seconds
Monday, February 2, 2015 at 11:14pm

science
is it possible for an object's weight to change while it's mass remains constant?
Monday, February 2, 2015 at 10:37pm

physical science
What amount of iron may react with 36gm of water vapour?
Monday, February 2, 2015 at 9:35pm

Science
Which of the following are structures that rely on capillaries for exchange or movement of small molecules? A. teeth, aorta, ureter B. cartilage, epidermis, larynx C. nephron, villi, alveoli D. leukocytes, atrium, bronchi Which of the following are structures that rely on ...
Monday, February 2, 2015 at 6:24pm

Science
1. Suppose a patient comes in to see a physician. This patient lacks the ability to keep warm and needs to wear heavy clothing even during mild temperatures. Which system of this patient’s body should the physician be concerned about? A. integumentary B. Skeletal C. ...
Monday, February 2, 2015 at 6:17pm

science
What part of a nerve cell receive the nerve impulse? Dendrite, Synapse or the Axon?
Monday, February 2, 2015 at 6:07pm

science 7th
A piece of copper is 1 meter long and has a density of 8.8g. If you cut the wire exactly in half, what is the density of one of the pieces
Monday, February 2, 2015 at 6:03pm

science
When a nerve impulse reaches a synapse, a nerve cell transfers the impulse to the next nerve cell by releasing D.electric currents. C.chemicals B.heat. A.pressure. Is it D?
Monday, February 2, 2015 at 6:01pm

Science
The current population in the United States is 318,968,000. The rate is .72. What will the population be in the United States in 10 years? Show work please.
Monday, February 2, 2015 at 3:34pm

Physical Science
Henry Heavyweight weighs 1200N and stands on a pair of bathroom scales so that one scale reads twice as much as the other. What are the scale reading?
Monday, February 2, 2015 at 3:04pm

science
Which statement is true regarding nuclear energy? (Points : 1) Nuclear power produces no greenhouse gasses and thus poses no environmental threats. Nuclear plants rely on a massive industrial infrastructure using fossil fuels. Due to strict safety regulations, nuclear power ...
Monday, February 2, 2015 at 2:24pm

Science
Two cannons are set up next to each other. Cannon A is set to fire at an angle of 50 degrees and B at 40 degrees. Prove that the range will be the same for both cannons.
Monday, February 2, 2015 at 1:41pm

science
A mixture of sugar and water can be separated by ______________. Choose ALL that apply. (2 points) Box 1. using a magnet Box 2. boiling the mixture Box 3. evaporating the mixture Box 4. using a filter I picked "Box 2" and "Box 3"
Monday, February 2, 2015 at 12:16pm

Science
A Block rests on a horizontal surface.The normal force is 20 N.The coefficient of static friction between the block and the surface is 0,40 and the coefficient of dynamic friction is 0,20. What Is the magnitude of the frictional force exerted on the block while the block is at...
Monday, February 2, 2015 at 12:12pm

Science
A swimmer that pushes the water back with feet and arms What will happen to the movement of the swimmer as they push the water back?
Monday, February 2, 2015 at 11:18am

science
Which of the following represents a heterogeneous mixture? A.saltwater B.air C.bleach and water D.chicken noodle soup I think the answer is D. Chicken noodle soup. I dont know exactly.
Monday, February 2, 2015 at 11:02am

Science
A swimmer that pushes the water back with feet and arms 1. What will happen to the movement of the swimmer as they push the water back? 2. If the swimmer exerts 5 n of force on the water how much force does the water exert back on swimmer? Please help
Monday, February 2, 2015 at 10:46am

Science
Which of the following is true about producers? A.They are helpful to some ecosystems and not essential to any ecosystems. B.They are helpful to all ecosystems but not essential to any ecosystems. C.They are essential to some ecosystems D.They are essential to all ecosystems
Monday, February 2, 2015 at 10:37am

Science
What physical features are caused by plate tectonics?
Monday, February 2, 2015 at 10:30am

Science
Explain a metal power/laundry line which hang droop on a very warm day
Monday, February 2, 2015 at 10:20am

science
an arrow is fired directly horizontal off a cliff that is 10.0 meters tall with a velocity of 65.5 m/san arrow is fired directly horizontal off a cliff that is 10.0 meters tall with a velocity of 65.5 m/s. How long is the arrow in the air?
Monday, February 2, 2015 at 8:37am

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