Science

Recent Questions

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
when an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has the boiling point of -183 C and the other has a boiling point of -253 C. Has a physical change or a chemical change occurred? explain.

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).

science
I have an essay about landforms on Friday what are some ideas?

Science Urgent😖😖😖
Why most organisms reproduce A( organisms must reproduce to maintain genetic similarity in the species B( organisms must reproduce to continue to build genetic diverse city into the species C( organisms must reproduce to continue the species D( organisms must reproduce to ...

Physical Science
If a skydiver has a forward velocity of 40 m/s, what is the forward velocity after one second? What is the downward velocity after one second?

Science
An object has a length of 5.2 cm a width of 3 cm and a height of 1.5 cm what's the volume

forensic science
if handwriting evidence was not yet considered to be considered to be scientific evidence at the time of united states v. starzecypzel,how was it admissible as reliable evidence

Science
a. A human cell is placed in a container of sugar water. Explain what would occur, if the cell membrane is impermeable to sugar. b. Another cell is placed into a container of sugar water. However, this cell has the capability to allow large molecules such as sugar to pass ...

phyical science
Which of the following phase changes is an endothermic change? A. condensation B. vaporization C. deposition D. freezing

phyical science
Boyle’s law states that the volume of a gas is inversely proportional to its pressure if the A. temperature and number of particles are constant. B. temperature reaches absolute zero. C. number of particles decreases. D. temperature and number of particles are doubled.

phyical science
Which of the following is NOT a pure substance? A. milk B. oxygen C. water D. carbon dioxide

Science/math
Newtons second law of motion states that F =MA Force equals mass multiplied by acceleration. Mass is the constant. It does not change. What is the independent and dependent variable? I put force is independent and acceleration is dependent. Is that right?

natural science
Draw a series circuit that contains : 2 cells in series, volmeter over the battery, an ammeter, closed switch and 2 light bulbs. also show direction of current flow.

science
The lift curve of the airfoil of an aircraft is as shown. The weight of the aircraft is 1500 kg. If the stall speed of the aircraft is 60 m/s, determine the wing area.

science
am stuck on the titration on maleic acid. am kindly asking for analytical chemistry by skoog.pdf. this assighnment is killing me. thank you

Science
If the spring have a stiffness of 950N/m what workwill be done in exerding the spring be 60mm

science
Calculate the work done by the brakes of a car of mass 1000kg when its speed is reduced from 20m/s and 10m/s

science
a body B moving a velocity of 20m/s collid with anothet body A moving in the same direction on the same horzontal line with a velocity of 10m/s, if the of body A is three time the same of body B and the collion perfectly elastic calculate the velocity of A and aftet the ...

Science
Hi I've read everything and searched everything and I can't find the answer to this question so... How is iodine-131 and iodine-126 similar and how is it different? Thank you this is stressin me out!

natural science
a fire fighter who weighs 800n climbs a uniform ladder and stops one third of the way up the ladder. the ladder is 5.0m long and weighs 180n. it rest against a vertical nail, making an angle of 53degree with the ground. find the normal and frictional forces on the ladder at ...

science
what is necessity of proper cleaning ? sanitation and spraying disinfectants in poultry farms?

natural science
a 500-n diver stands at the end of 4.0-m diving board. the board is attached by two supports 1.5-m apart as shown below. find the tension in each of the of the two supports if the diving board weighs 150-n

Science
An electron travels 1.23 m in 4.66 × 10−8 s. How fast is it traveling? Answer in units of m/s.

science
light that has a frequency of 1.5 x 1015 Hz.

Science
How is energy in a ecosystem replenished?

science
An iron cylinder with radius 1.0 cm and length 25 cm has one end held at 250°C and the other at 20°C. Find the heat-flow rate through the cylinder

science
Phosphorus in the soil comes from ?

science
in this experiment, 3 sets of plants were grown. one set had no light, one set had some light, one set had full sun. each set was given the same amount of water, the same temperature, the same soil and it was the same plant and same pot. in 21 days this is the amount of growth...

science- physics
A position vector with magnitude 40 m points to the right and up. Its x-component is 32 m . What is the value of its y-component?

science
Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means B. both substances have a set ratio of atoms that can be separated by physical means C. both separated...

Science
1. Which of the following traits is acquired? A. The number of petals that grow in a plants flower B. the wing shape of a wild bird C. The ability of some gorillas to learn sign language** D. A cheeta’s ability to run faster than any other land animal 2. The height of a ...

science
body parts found in two or more similar species ______ help scientists from theorists about evolutionary relationships plz help

science
Describe the two most important events in the history of animal life that occurred at the beginning and at the end of the Paleozoic era. (2 pts) List and briefly outline the six different periods into which the Paleozoic era is divided.

science(bio)
Why did dinosaurs evolve so much earlier than humans?

science- physics
Find the x- and y-components of the vector d⃗ = (6.0 km , 31 ∘ left of +y-axis). I worked it out and got 5.14, 3.09 and apparently it's wrong, I don't know what I did wrong.

Science
consider a solid cylindrical disk rotating on an axis through its center. If the angular momentum of the disk increases, what can you conclude?

materials science
An isotropic epoxy resin (E=2GPa, ν=0.3) is reinforced by unidirectional glass fibers (Eglass=70GPa), aligned in the 2 direction, such that the fiber composite is transversely isotropic, with the 1-3 plane being the plane of isotropy. The elastic constants of the fiber ...

science
an isotropic epoxy resin (E=2GPa, ν=0.3) is reinforced by unidirectional glass fibers (Eglass=70GPa), aligned in the 2 direction, such that the fiber composite is transversely isotropic, with the 1-3 plane being the plane of isotropy. The elastic constants of the fiber ...

Mechanic Science
A motorcycle starts from rest with constant acceleration of 1.5m/s^2 until it achieves velocity of 15m/s. The motorcycle decelerate until it stop 12s. Determine: 1) the deceleration of motorcycle 2) distance traveled by the motorcycle

science
The process in which an animal’s cells use oxygen and digested food molecules to release the energy in food is called a. Breathing b. cellular respiration c. diffusion d. gas exchange

Physical Science
A 15 g bullet is fired with a velocity of 200m/s from a 6kg rifle. What is the recoil velocity of the rifle?

HELP SCIENCE ASAP
How are fish, amphibians, reptiles, and birds alike? How are they different? Include at least two similarities and two differences.

science
What advantage would a backbone give to an animal that lives underwater?

Science- RE-DO
1. White skin (W) is dominant over yellow skin (w) in chickens. Which of the following genotypes would result in a white-skinned chicken that could possibly have yellow-skinned offspring? A. WW B. Ww** C. ww 2. Which of the following describes the genotype and phenotype of ...

Science
1. White skin (W) is dominant over yellow skin (w) in chickens. Which of the following genotypes would result in a white-skinned chicken that could possibly have yellow-skinned offspring? A. WW B. Ww** C. ww 2. Which of the following describes the genotype and phenotype of ...

Science
Hello! I had a question about variations in animals, also known as genetic variations. What is a variation? I cannot find an example or a sturdy definition anywhere. Could someone give me an example of variation in animals? Thank you!

science
What advantage would a backbone give to an animal that lives underwater? Thank you

Science
Which letter arrows point to hanging valleys? Which letter arrows point to aretes? Name a peak on the map that is a horn. Feature E on the map is composed of glacial till. What type of glacial feature is E, and how did it form? Explain how turquoise lake formed? file:///C:/...

science
Which of the following explains the relationship between genes and chromosomes. a) Chromosomes come in diffrent versions called genes. b) genes come in diffrent structures called chromosomes. c) Chromosomes are structures that are made up of two versions called genes. d) genes...

Science
Ms. Sue PLEASE check my answers! 1. Which of the following is not part of the theory of evolution? a. Organisms tend to produce more offspring than can survive to reproductive age. b. Organisms can acquire changes during their lifetime that can help their species survive. c. ...

Science
What cannot be separated into simpler substances by physical or mechanical methods such as filtering boiling or shifting

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
which of the following features make earth and venus similar to each other ? (1point ) A . their size and mass b. their rates of rotation c. their atmospheres d. their directions of rotation****

Science
1) Which of the following statements about the sun's structure is true? The sun has a solid surface The sun has an interior and an atmosphere The sun's interior is similar to the Earth's; it has a core, mantle, and crust*** The sun's outermost layer is called the radiation ...

Science
The half life of Uranium-238 against alpha decay is 4.5*10^9 years.Calculate the number of disintegrations taking place in 1gm of the substance.

Science
The half life of radium is 3.82 days.In what time will the activity decay to 1/16 of its original value.

science
An object moving in a straight line at a constant velocity of 2m/s accelerates at 3m/s2 for 4s . what's the displacement of the object ?

Science
1. A pea plant with yellow seeds is crossed with a pea plant with green seeds. All of the offspring have yellow seeds. The allele for yellow seeds is A. dominant because all of the offspring has yellow seeds** B. recessive because all of the offspring has yellow seeds C. ...

science
one side of a cube of an unknown metal measures 0.53cm. If the mass of the cube is 0.92g, what is the density of the cube?

Science
a(n) ____ occurs during the design process when one benefit is given is given up in order to obtain another thanks

Science
What were five accomplishments of marie curie?

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