Science

Recent Questions

Science
How do you think a scientist might figure out a person’s identity from bones? My answer I think that depending on the shape and size of the bones are different for every person like you DNA. This is how they know who you are. it is also possible that your bones carry DNA or ...

Physical science
What is the current produced by a 9volt battery flowing through a resistance of 2*10 ohms

Science
If a crate with 350N is pulled so that the crate slides at a constant velocity what is the friction force?

Science
what is Porn?

Science
A body of mass 8kg moving with a velocity of 10m/s collides with another body of mass 6kg moving in the opposite direction with a velocity of 50m/s.determine their common velocity in the direction of A after collision

MATERIAL SCIENCE
1. Calculate the theoretical density of Barium metal barium 2. Calculate the theoretical densities and packing factor of barium zirconate (BaZrO3), and barium cerate (BaCeO3), both of which form the perovskite structure

Science
If a spring has a shiffness of 9,50nm-1 what work will be done in exered the spring by 60mm.

Science
What is the centripetal acceleration a satellite is orbiting the Earth at an altitude of 300.22 km?

physical science
A golfer on a level fairway hits a ball at an angle of 38° to the horizontal that travels 85 yd before striking the ground. He then hits another ball from the same spot with the same speed, but at a different angle. This ball also travels 85 yd. At what angle was the second ...

science
What is the form of the graph, and what is the approximate distance traveled by the aircraft in 7.5 seconds

science
If exponential growth occurs in the population of a species of predator, the population of its prey will most likely decrease quickly. increase slowly. stay the same. experience exponential growth.

science n4
a bullet is fired vertically upwards wth a initial velocity of 300m/s as it leaves the barrel.the rifle barrel is level with the ground and the rifleman stands in a trench.calculate the velocity of the bullet when it is 200m from ground level during the downward movement.

Science
Plz correct me if I'm wrong!! 1) Which of the following is a chemical change? (1 point) Boiling of water Melting a cube of ice Dissolving 10 grams of salt in water Splitting water into hydrogen and oxygen*** 2) What is the mass of water that results from combining 2.0g of ...

science
Atomic no.of an element is 12. what is it valency?

science
A loaf of bread weighs 1,362 g. The weight in kilograms is Select one: a. 1,362 kg. b. 0.01362 kg. c. 0.1362 kg. d. 1.362 kg. Next

science
if more sugar is placed into a glass of iced tea than can dissolve in the te,the additional sugar will sink to the bottom of the iced tea. Which of the following statements best accounts for the observation that an oversupply of sugar crystals will collect on the bottom of the...

science STEM FAIR
Do all liquids evaporate at the same rate ? Liquids 1. Water 2. Nail polish " Remover " 3.Ginger ale

science
Can you predict the force needed to stretch the rubber band to 40.0cm?why or why not

earth science
The global ocean covers about 70% of the Earth’s surface. If all the ocean water was uniformly distributed over the whole surface, what would be its depth? Assume that the Earth is a perfect sphere, and the average ocean depth is 4 km.

SCIENCE HELP PLS
Which of the following is a source of graywater? Sewage water Shower water Water waste from an auto repair garage Water waste from a chemical company is it b

Science
Describe one observation astronomers use to show that the universe is expanding

Science
-Explain how and when the universe formed according to the big bang theory? -Explain how and when our solar system formed? -Describe one observation astronomers use to show that the universe is Expanding?

science
1. The liquid part of the blood is called _____. (1 point) hemoglobin plasma platelets white blood cells 2. Your circulatory system can best be compared to _____. (1 point) gates a net pipes a balloon 3. Which of the following shows the correct order of blood flow? (1 point) ...

science
Which of the following describes Joseph Lister’s role in discovery and prevention of disease? (1 point) recognized the relationship between disease and cleanliness discovered that microorganisms cause disease in humans invented pasteurization developed a series of methods ...

science
how many electrons are in the sodium sulphate?

Science
if a strong odour is smelt continuously for some time the sensation of smell of that substance weakness why?

science
a body floats with only 30% of its volume out of water.calculate the density of this body.

Science
which part of the tongue is stimulated by more temperature? Explain.

SCIENCE
A MACHINE OF EFFICIENCY 60% IS USED TO RAISE A LOAD OF 150kg THROUGH A VERTICAL DISTANCE OF 2.5m.CALCULATE THE WORK DONE [IN JOULES]. I tried E=WORK OUTUT/WORK INPUT times 100% 60=150 times 10 times 2.5/work input times 100 60 times work input=3750 times 100 work input=375000/...

science
a 50 kg of astronaut ejects 100 g of gas from his propulsion at a velocity of 50 m/s. what is his resulting ?

Science
Find the resultant of two displacement vectors A and B, the magnitude of A is 45 meters and the magnitude if B is 25 meters?

Science
An artificial satellite circles around the earth at the height where the gravitational force is one fourth of that at earth's surface. If the earth's radius is R the height of the satellite above the surface of the earth is?

Science
Explain how coal is useful in the production of iron and aluminium.

science
what is the velocity of a 0.7 kg ball that has a momentum of 1.4 kg m/s

science
Which is not part of your immune system's response to a disease-causing organism? vaccination recognition disposal immunity vaccination right

Science
Ionic bonds: a. result from the sharing of electrons between atoms. b. form only between polar molecules. c. form between atoms that develop opposite charges. d. result from the natural repulsion that develops between protons. answer is C

Science
As a result of rigorous experimentation Question 7 options: more hypotheses may be developed. more questions may be asked. a new biological concept could emerge. entire theories may be modified or discarded. all of these i suppose

Science
Hypotheses can be rejected or supported by experiments, or, in some instances, new observations. i think it's true

Science
Consider the researcher's experiments on the mysterious die-offs of fish in North Carolina rivers. Which of the following best represents her main hypothesis? Question 8 options: Fish maintained in laboratory environments were dying when exposed to river water. Microscopic ...

Science
Organisms designated autotrophs obtain their energy from: other producers. dead consumers. decomposers. inorganic sources. i think it's all of these.

Science
How do astronomers use spectroscope??

Life science,geography ,history and mathematical literacy
Is it possible for me to do Nursing with those subjects?

pure maths, tourism, religion, life science, life orientation, agriculture
do I fit to study nursing? ?

Science
How does altitude affect climate? The higher the altitude, the colder the climate will be. (MY ANSWER) The lower the altitude, the older the climate will be. The higher the altitude, the hotter the climate will be. Altitude is not related to climate.

Science
Plz correct me if I'm wrong!! Which of the following is a chemical property of aluminum? A.) The melting point of aluminum is 660 degrees C B.) The boiling point of aluminum is 2519 C C.) Aluminum does not dissolve in water D.) Aluminum reacts with oxygen••

Science
A storm with winds over 120/km/h that can last several weeks is a? A.Tornado B Hurricane C Jet Stream D Thunderstorm I think its hurricane am i right?

science(physics)
a car of mass 100kg travering at 36km/h is brought to rest over a distance of 40m.calculate(a)accelaration(b)the average abreaking force

Science
You digestive system has three main functions: digestion, absorption, and elimination. In which organ does absorption begin? A)Mouth B)Stomach C)Small intestine D)Gallbladder I think its C.

Physical Science
At a baseball game a ball of mass m = 0.11 kg moving at a speed v = 22 m/s is caught by a fan. the ball is stopped in 0.014 s , find the average force of the ball on the catcher's hand?

computer science
The question thus is the military initiated Arpanet, which matured into our Internet through a high social value of its potential, still provide the same social value it initially provided when the web exploded in popularity?

Computer Science
Create a class called Shapes that has a private int field named radius and the proper get- and set- methods (according to our Java coding standards). Create a constructor that takes an integer as a parameter to initialize the radius. Create a void method called report() that ...

science
what happens to animals when habitats change

Science
Plz Correct me!! Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12H22O11. Which of the following is true? (1 point) Both compounds are held together by chemical bonds. Both compounds have the same density. Both compounds react with water. Both ...

Science
Plz correct me!! A student combined water, sugar, and salt in a beaker. Which of the following statements is true? (1 point) The individual substances can be separated by physical means. The individual substances cannot be separated by physical means.* A new substance is made ...

Science
Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12H22O11. Which of the following is true? (1 point) Both compounds are held together by chemical bonds. Both compounds have the same density. Both compounds react with water. Both compounds contain...

Science
Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12H22O11. Which of the following is true? (1 point) Both compounds are held together by chemical bonds. Both compounds have the same density. Both compounds react with water. Both compounds ...

Science
Select three words that belong together. To do this pick one word from each of the three sets below: Set 1: Estuary, Lake, Neritic Zone Set 2: High Salt, Intermediate Salt, No Salt Set 3: Trout, coral, oyster Answer choices: A) Neritic zone, intermediate salt, oyster B) Lake, ...

science
a box of 5kg lies on a ramp of inclination 30degrees. Calculate the maximum static friction force needed to keep the box stationary

Science
Under which conditions are clouds formed from ice crystals? A.strong winds B.high altitude (MY ANSWER) C.low humidity D.high pressure

Science
Select three words that belong together. To do this pick one word from each of the three sets below: Set 1: Estuary, Lake, Neritic Zone Set 2: High Salt, Intermediate Salt, No Salt Set 3: Trout, coral, oyster Answer choices: A) Neritic zone, intermediate salt, oyster B) Lake, ...

Science
Blank is a round pellet of ice larger than 5 millimeters in diameter. Snow. A hailstone. Sleet. (MY ANSWER) An ice crystal.

Science
Which of the following safety measures should you observe when there is lightning. Stay away from objects made of plastic. Stay away from metals and other objects that conduct electricity. (MY ANSWER) Stay near open windows. Stay on the roof of your house.

Science
Eli sees a puddle in parking lot after a rainstorm. The next day, the puddle has gotten smaller. Which of the following most likely happened to the water in the puddle? It condensed. It evaporated. (MY ANSWER) It became colder. It transpired.

Science
Which of the following is a correct description of a tornado? A large swirling low pressure system that forms over that forms over the warm Atlantic ocean. A winter storm with wind speeds of at least 56 km/h and low visibility. A violently rotating column of air in contact ...

Science
When water droplets in a cloud combine, become too heavy, and fall to the ground, you are experiencing? Evaporation. Condensation. Precipitation. (MY ANSWER) Transpiration.

Science
What would be a great title for this question.... Which food will mold the fastest??

Science
A mixture of sugar and water can be separated by _________________. Choose all that apply. (2 points) using a magnet boiling the mixture •• evaporating the mixture•• using a filter Correct me if I'm wrong!!

maths science and geography
in a geometric sequence,the fifth term is four times the third term,and the second term is 4.if r<0 determine the value of r,the common ratio

Science Help!
Long hair is recessive in cats. Which of the following Punnett squares shows a cross that would result in the probability that 75% of the offspring will have short hair?

Science
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

Science
3. Through which process will metamorphic rock and igneous rock change into sedimentary rock?

science help
What is a genetic mutation? A:the process of decreasing chromosomes numbers to half of what the parent cell has. B:the copying of DNA to form identical daughter cells. C:a permanent change in an organisms genetic code. D: a fusion of egg and sperm cell to produce a new ...

Science
When you turn on a battery powered flashlight you transform... 1) heat into light chemical energy 2) chemical energy into electrical energy and light 3)heat into chemical energy and light 4) electrical energy and light energy into chemical energy

Class 8 Science App
Hello, Have you seen the new app MarkSharks Class 8 Science? I like it a lot.It's very interactive and makes learning fun. Please try it and tell me what you think. You can download on the Google Play Store and use it on any android device

Science
Hello, Have you seen the new app MarkSharks Class 8 Science? I like it a lot.It's very interactive and makes learning fun. Please try it and tell me what you think. You can download it here and use it on any android device.

maths lite.life science.agric.afrikaans
is it possible for me to become a medical docter without pure maths but life science??

science
if the canoe accelerates from 0 to .8 m/s in .2 s, what is the acceleration

Science
what can fossils tell you about organisms and environments of the past?

Physical Science
QUESTION---Which waves have wavelengths longer than those of visible light? MY ANSWER--Infrared light, microwaves and radio waves have wavelengths longer than visible light. Radio waves have the longest wavelength. Are there any others?

science
Scientists earlier believed that the lowest measurable temperature is the freezing point of ice. However, modern scientists believe that temperatures below the freezing point of ice can also exist. What best accounts for these different opinions? scientists propose ...

Physical Science
I am having trouble coming up with an answer to this, and I can't seem to find it in my textbook....can I get a little help? QUESTION---Explain why the speed of sound is faster in solids than in gases

Physical Science
QUESTION GIVEN---Thermal 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. MY ANSWER---Because, the ice may be trying to transfer cold, but if the ...

Science
Beach sand contains plenty of the mineral quartz. Why should you not put your plastic sunglasses down on the sand at the beach?

science
why does the sun appear to move westward across the sky during the day? a) because earth rotates to the east b) because earth rotates to the west c) because the sun moves in a westerly direction d) because of the way you are looking into the sky

Science
Two objects with charges of +1.0 c and -1.0 c are separated by 1.0km. Find the magnitude of the force that either charge exerts on the other.

science
after striking the floor a ball rebounds 4/5th of the height from which it has fallen find the total distance travelled before coming to rest considering its dropped from 100m

Science HELP!
2:What is the genetic code? A:The order of amino acids in proteins makes up the genetic code. B:The order of amino acids in mRNA makes up the genetic code. C:The order of nitrogen bases in tRNA makes up the genetic code. D:The order of nitrogen bases in DNA makes up the ...

science
2. which of the following statements about the inner planets is true ? ( 1point ) A. they all have rings b. they have all abundant liquid water c. they all have many moons d. they are small and have rocky surfaces

science
what will be the pH and normality,when 33.6liters of HCl having 1.179 s.g. and 36%concentration is mixed with 736 liters of distilled water

Science
What will be the pH and Normality when 33.6 liters of HCL having 1.18 s.g.and 36% concentration

Science
A tank which is raised above the ground level, has a hole in its flat base, through which water flows and falls to the ground below. If the depth of water in the tank is 0.5 m and the tank base is 0.7 m above the ground, what is the fluid velocity (u) (m/s) just before it ...

science & technology
when a body immersed in water from spring balance and shows 100gm weight loss. what is the weight of the body in water? 2)what is the weight of the body in air? 3)what is the upthurst on the body? 4) what is the volume of the body? give reason

Science
Which direction will a positive charge move if it is placed in the electric field surrounding a proton? Which direction will a positive charge move if it is placed in the electric field surrounding an electron?

science
formula for kinetic energy?

Science
If a dune moves 40m a per year, how far does it move in 1 day

Science
Mario and sheen a were thirsty after a long bike ride, so they stopped to get a glass of lemonade. Their friend Andy was selling lemonade. He poured the lemonade into the two glasse. Before they start drinking sheena who had the shorter glass complained that she had paid the ...

Science
How Andy could prove his two customers got the same amount of lemonade

Science
A body initially at distance given an acceleration of 12/s2 (squared2 ). Find the velocity after it travelled 205. Q2. A body moving in linear motion start with an initial acceleration after 205 was 12m/s2. What's the velocity at this instance?

Science
What are some every day uses that have the same function as Golgi Bodies?

science
A box is placed on rough surface.it has a normal force of magnitude 120N.a force of 20N applied to the right cannot move the box.calculate the magnitude and direction of the friction forces

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