# Science

## Recent Questions

basic science
3 component of environment

Science
Is it possible for scientists to do studies about things that happened millions of years ago? Explain. Please give me an example..!

Science
A body weighing 150 N, moves with simple harmonic motion. The velocity and acceleration of the body when it is 200 mm from the centre of oscillation, are 5 m/s and 20 m/s2 respectively.Determine (a) amplitude of motion ,no. of vibrations per minute, Periodic time and angular ...

Science
Calculate the gram molecular mass of nitrogen if 360cc at STP weigh 0.45g.

Science
How does a cockroach protect itself?

Science
A 8.8-kg object is moving at 5.3 m/s. A 7.4-N force is applied in the direction of motion and then removed after the object has traveled 4.7 m. The work done by this force is:

Science
A piece of wood float on water and sinks in a methylated spirits .if the density of the wood is 0.8g/cm,explain why it would float on water and sink in methylated spirits .what can you say about the methylated spirit

science
Two rods of equal length and temperature at end of the rods is T1 and T2. What is the condition for equal flow of heat through them

English
Unit 4 Lesson 4: Writing Workshop: Compare & contrast essay I have to compare Nethergrave with something that's science fiction, from a book, movie, or even a video game... Any ideas what I should compare Nethergrave with?

Science
Mammals whose young develop in a pouch on the mother's body are called: a.placental mammals b.monotremes c.marsupials d.gymnosperms thx

science
a stone is dropped from the tower of hight 125m; calcute (1) Time taken to reach the ground. (2) Find velocity of stone.

Science Physics
An air plane flies 20 km in a direction 60 degree west of north then 40 km straight east and then 10 km in a direction 30 degree north of east . How far and at what direction is the plane from the starting point?

science
How much work is done by the system if the internal energy decrease by 100j when 200j applied to the system

science
what makes us cry while chopping the onions?

science
parasitic worm infestation is hypothesized to be damaging to the host. However scientists have recently discovered that worm infestation of certain autoimmune disorders. in which of the following ways should the hypothesized to be modified , given the new findings A. worm ...

science
how many moles of h2 can be prepared from 3moles of Fe ?

Math
In Mrs. Wallace's science class one half of the students are boys of the boys 1/8 or left-handed what fraction of the students and Mrs. Wallace's science class are left handed

SCIENCE
Calculate the mass % of nacl in a solution containing 1.5g of nacl in 50.0g of water

science
which of the following would decrease the human ecological footprint? 1) using bottled water instead of tap water 2) using public transportation instead of riding in a car 3) buying books instead of borrowing from the library 4) using hot water instead of cold to wash clothing

Science
A ball of mass 1000g moving with 7m/s impinges another ball of twice its own mass and moving with 1/6th of its own velocity and moves in the opposite direction. If the coefficient of restitution is 0.75, calculate the velocities of the two balls after impact

science
How is biodiversity related to human activities that use natural resources? 1) it decreases as humans use natural resources wisely 2) it increases as humans develop sustainable ways of using natural resources.

science
What are the similarities and differences between mitosis and meiosis?

science
Which of the following will make it harder in the future to develop sustainable methods for humans using resources? 1) there will be fewer renewable resources 2) more humans will populate the earth 3) more humans will recycle mterials

science
Suppose a bar 1 m long expands .5 cm when heated. By how much will a bar 100 m long of the same material expand when similarly heated? If each one meter expands a half centimeter, then one hundred meters will expand 100*.5cm. Think on that.

science
1) A null Hypothesis assumes that a process is producing no more than a maximum allowable rate of defective items. The Type II error is to conclude that the process? 2) If 95% confidence limits for the mean Mu turn out to be (6.5,8.5) Plz help me

Computer Science
FIND the sum and the average of marks of students given in 5 different subjects out of 100 by flowchart.

science
a cylinder filled with hydrogen gas at 20 degree atmosphere can with hold 10litres of water .the spherical balloons are to be filled with hydrogen gas such that the radius of each balloon is 5 centimeter .how many balloon can be filled with hydrogen gas from it .

science
If a penny prior to 1982 weighted 3.1 grams and a current one weighs 2.5 grams how many pennies weighing 3.1 and 2.5 will I need in a combination of ten in total to have 25 grams??

science
A librarian lifts a box of books that weighs 93N a distance of 1.5 m. How much work does he do?

Science
Go to the place where knowledge sleeps Follow the path that he left behind Where data are tested and facts win out Find what is labeled with a century less two Now name the phantom marked by cross and double lines

Science
1.Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen 2. Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic time ...

Science plsss help!
1.Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen 2. Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic time ...

computer science
In a mobile phone network, how many times as strong would a signal be expected to be at 500 m from a base station, compared with at 250 m? Choose the nearest value from the list below.

computer science
A GPS satellite develops a fault whereby it moves into an orbit 19 500 km above the Earth’s surface and also emits a weak signal whose power is only 24 W. What will be the power per square metre of the signal received on the Earth’s surface? Choose the nearest value from ...

computer science
In a particular phase modulation system, each symbol is able to represent 4 bits. What sort of PSK is being used?

Science
Balance chemical equations using the first 20 elements

science
if a tank has water to depth of 10m calculate the pressure exerted by it

Life Science Math
Cheetahs are the fastest land mammal. They can accelerate from 0 to 60 mph in 3 seconds. Assuming a cheetah’s acceleration is constant, how far has it run during that time interval?

science
tom is marking the locations of active volcanoes on a world map. how the locations of the volcanoes are related to earths plats.

material science
A uniform compressive stress σz is applied to the surface of the metal alloy, and it may be assumed that there is no friction between the alloy and the die. This aluminum alloy has Young’s modulus E=70GPa and a Poisson’s ratio ν=0.33. Determine the value of σz, in MPa, ...

material science
A uniform compressive stress σz is applied to the surface of the metal alloy, and it may be assumed that there is no friction between the alloy and the die. This aluminum alloy has Young’s modulus E=70GPa and a Poisson’s ratio ν=0.33. Determine the value of σz, in MPa, ...

ACCOUNTING
Budgeting is _______________________________. (Points : 1) A an exact science B going to involve the use of estimates C not going to ever produce a variance if properly prepared D never created using information from a previous period ANSWER B

accounting
Budgeting is _______________________________. (Points : 1) A an exact science B going to involve the use of estimates C not going to ever produce a variance if properly prepared D never created using information from a previous period ANSWER B

science
What causes the current to move through a battery?

Science
A system comprising blocks, a light frictionless pulley, and connecting ropes is shown. The 9 kg block is on a smooth horizontal table The surfaces of the 12 kg block are rough, with μ = 0.30. In Figure 5.7, the mass M is set so that it descends at constant velocity when ...

science
what types of are formed when atoms share electrons unequally

Science
How much sugar is needed to reach the point of saturation at 20 degrees celsius?

science
A ball is kicked with an initial velocity of 20.0m/s at an angle of 30.0 degrees above the ground. What are the horizontal and the vertical components of its velocity after 1 second?

science cells
what role does the golgi play in a cell?

science cells
What is the function of the nucleolus in the cell?

Science
suppose that you swat a bee it stings you. jerking your hand away from the bee is a... A) Motor Neuron B) Reflex** C) Stimulus D) Voluntary Motion

Science
How could the development of a smart grid help protect the environment? a. a smart grid uses only renewable energy sources b. a smart grid burns fossil fuels without producing pollution c. a smart grid connects nonrenewable energy sources, making them renewable d. a smart grid...

ELA
"The Enlightenment and the Scientific Revolution were twin explosions in thinking that made the 17th and 18th centuries one of the most exciting and dynamic eras in European history. People cam to believe the power of human reason apart from the guidance of religion. ...

science
A solution of aqueous ammonia contains 28.0% NH3 by mass. the solution has a density of 0.898g/mL. calculate the volume of this solution required to make 425mLof 0.320M NH3 solution.

Science
A boy carries 100N to 500m. How much work is done

Science
How can geologists identify different types of ammonites? A. by the times of fossilization B. by the size of their gills C. by what they ate at the time D. by differences in their shells

Science
Which type of dating do index fossils provide the most help for? A. carbon-14 B. radioactive C. relative D. absolute

Science, Biology
Can you teach me how should I answer these questions please.. Why the events are significant? First mammals: First primates: First modern humans:

Science
_____ is useful for dating very old rocks because it has a half-life of 1.3 billion years. A. thorium-232 B. potassium-40 C. uranium-235 D. carbon-14 is the answer D?

Science
What happens to the mass of a sample containing a radioactive element during its half-life? A. The mass decreases by half. B. The amount of mass is doubled. C. Eventually there is no mass at all. D. The mass remains the same.

Science

science
The heaviest naturally occurring element is

science
calculate the number of kilojoule necessary to raise the temperature of 60 gram of aluminium from 35 degree Celsius to 55 degree Celsius.Molar capacity of aluminium is 24 joule per mole per Kelvin?

SCIENCE
HOW IS A PARENT GENERATION OF A FERN DIFFERENT FRON THE GENERATION THAT COMES BEFORE AND AFTER IT

math, science
what are the difference and similarities between math and science

Science
How do structures in living organisms compare with structures of nonliving things such as construction cranes, buildings, ships, airplanes, or bridges?

science
Which type of energy would the toy have if you pushed it and held the spring in the toy? F) electrical G) kinetic H) potential of I) thermal? ( there is a spring in the toy) I think it is potential energy since the spring is going down.Right?

Science
What parts of the earth did glaciers cover during the ice age.

Science (Stoichiometry with Gasses) (Chemistry)
If 1.00 kg of methane (CH4) is burned completely (in excess O2) and the CO2 produced is collected at 20°C and 1.00 atm, what volume (L) will this CO2 occupy??

Science
How many electrons are present in 0.01 moles of sulphate ion

Science
A car starts from an initial velocity of 10m/s and accelerates at 2.5m/s².how long will it take the car to reach a speed of 40m/s.. How far doea the car travel during this time?

science
5. Suppose a skydiver (mass = 75 kg) is falling toward the Earth. When the skydiver is 100 m above the Earth he is moving at 60 m/s. At this point calculate the skydiver’s…….

Science
A Man Wants To See His Own complete image in the mirror.if,the height of the man is h then calculate the length of the mirror?

science
determine the velocity of the truck if it starts from rest and accelerate at 2m/s² in 3.2s

science
A body of mass 0.1kg starts to fall freely under gravity from a height of 3m.Calculate its potential and kinetic energy when it is 1m above the groind

Science
Help pzzzzzz Sound in an empty room can be very loud,with many echoes.Describe three ways to make the room quieter?

Science
Word that means "flat like a plate "(flat land that Is higher than surrounding land"

science
A banana turning brown when exposed to the air is an example of

Science Ms. sue help
what is the function of a cell wall A) to Protect and support the cell B) to preform different functions in each cell C) to prevent water from passing through the cell D) to prevent oxygen from entering the cell. Help!!!!

science
an experiment discovered that a particular material was a poor conductor of electricityA. conductor B. insulator C. switch D. resistor

Science
Which of the following may occur during metamorphism? A. The rock becomes less compact. B. Certain minerals may recrystallize. C. Crystals may grow smaller. D. The rock becomes less dense.

HISTORY GOVERNMENT CCA
what characteritics do bureaucracies share? check all that apply Formal rules generalization clearly defined goals chain of command elected staff which of the following is part of the executive branch bureaucracy? the president's cabinet the congressional budget office the ...

SCIENCE
The diagram shows the variation of air pressure from an alarm siren at particular instant. The speed of sound in the air is 340m/s. what is the period of alarm siren.

Science
I am doing an Animal project , I need a picture to show how an animal had bilateral symmetry! I couldn't find any pictures that could actually show that. Can you pleas help me? Thank you

Science
When is the end of the world

American Government
1) What characteristics do bureaucracies share? Select all that apply. A) formal rules** B) generalized jobs** C) clearly defined goals D) chain of command** E) elected staff 2) Which of the following is part of the executive branch bureaucracy? A) the president's cabinet B) ...

science
In the equation below, suppose 11 grams of Zinc (Zn) react with 12 grams of Hydrogen Chloride (2HCl) to form 16 grams of Zinc Chloride (ZnCl2) and an unknown amount of Hydrogen gas (H2). Zn + 2HCl → ZnCl2 + H2 Based on the Law of Conservation of Mass, how many grams of ...

Science
Calculate the displacement and velocity at time of 0.5secs for a ball thrown straight up with an initial velocity of 15m/s.

Science
Is there a relationship between the dates for first land plants, fish, reptiles, mammals, primates, and humans and the amino acid differences?

Physical Science
How much energy is released when 10 gm of steam at 100 degree Celsius turns to ice at 0 degree Celsius

Science (galaxies and universe)
Studying distant galaxies is described as looking back into the past. What does this mean? (use terms light year, distance, and time in your answer)

Science
Why is the surface of the Moon full of pockmarked craters? a) It has little weathering to erode them. b) Due to meteorites landing on them

What makes the moon rise? a)Alignment of the stars 2) Earth's rotation 3) Moon orbits about the Earth Is the answer (2)?

Science
Why do Hydrogen atoms form only single bonds with other atoms and not double or triple bonds like Carbon atoms?

Science
Why are the water molecule bonds at an angle and not straight like the CO2?

why are capillaries and not arteries or viens not found in alveoli,nephrones,and villi A.vessels must be small so that very little blood enters these tissues B.vessle must be narrow so that very smal moluculescan reach these tissues C.vessls must be light wieght so that way ...

Science
Electric bulb is Marked 60 watts 120 volt what is the resistance of filament of bulb

science
a 0.5kgball falls into a heap of sand from a height of 10m above the sand. it comes to rest 2.5m beneath the surface of sand. what is the average force exerted by sand on the ball.

science
Sodium react with chlorine to form sodium chloride a substance used in all households 1.Household name of sodium chloride

Science
Can resultant magnitude of two vectors be smaller than the magnitude of either vector?

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