Science

Recent Questions

Science Physics
Derive an expression for kinetic energy of an object mass m moving with uniform velcoity v what happens to the kinetic energy of a body if its velcoity is halved

Science, physics
A ship is heading north at 15km/h in a tide moving at 6km/h westward. Determine the magnitude and direction of the resultant velocity of the ship. I can't answer it because I don't get the formula. And please give me the formula. I need the answer later. I'll wait! Thankyou in...

Science
Derive an expression for kinetic energy of an object mass m moving with uniform velcoity v what happens to the kinetic energy of a body if its velcoity is halved?

science
The apparent weight of cube in liquid with relatibe density 0.9

Engineering science
A steel cylinder contains an ideal gas at 27°C. The gauge pressure is 140kPa. If the temperature of the container increases to 79°C, what is the new gauge pressure?

Science
It takes a force of 22 N to push a 10 kg box horizontally with a constant velocity over concrete. What is the coefficient of kinetic friction between the box and the concrete? My guess is 10 kg/22 N = 0.4545 but I'm not sure if you have to take in account vertical forces or if...

science
A ray of light travelling in air strike the water surface at an angle of 40° calculate the refractive index of water if angle of refraction is 29°

Science
The lung is to the respiratory system as the ____ is to the integumentary system. A) heart B) kidney C)hand D)brain B

Science
A new geosynchronous satellite needs an orbit of 35.7 km . The mass of the Earth is 5.97x 10^24 Kg and the radius of Earth 6.4 x 10^3 km. The mass of the satellite is 200 Kg. What velocity will it need to achieve that orbit

science
what does the slope of a electric force vs. 1/R^2 graph represent?

Science
A new geosynchronous satellite needs an orbit of 35.7 km . The mass of the Earth is 5.97x 10^24 Kg and the radius of Earth 6.4 x 10^3 km. The mass of the satellite is 200 Kg. What velocity will it need to achieve that orbit?

Science
The Sun exerts a gravitational force of 3.56 x 10^22 N on Earth. The mass of the Sun is 2.0 x 10^30 kg. The mass of the Earth is 6.0 x 10^24 kg. If we assume the Earth has a circular orbit of 1.5 x 10^11 m, what is the velocity needed for Earth to remain in orbit?

Science
A car completes a half of a circular track that has a radius of 10 m. What is the distance traveled by the car? What is the displacement of the car?

Science , Biology
Which creatures live on the energy of the Sun? Angel fish Suquirrel fish Sea urchins Porcupine fish Octopus

Science , Biology
Is Atlantic spadefish Nocturnal or Diurnal? Carnivore, Herbivore, Autotroph? Is Porcupine fish Carnivore, Herbivore, Autotroph? Please give me informationsss!!

science
In the following equation , 417.96 g of Bi reacts completely with 200 g of F . How many grams of BIF (to the third power) are formed?

Science
Take 1mL of 1M NaCl solution, and add 9mL of water. Then take 10microL of the diluted solution and add 40microL of water. What is the dilution? And what is the final concentration of NaCl? So I see how this is a 2:1 dilution, but I am having a hard time figuring out the final ...

science (ASAP)
what does the notation TT mean to genetics

Science
What is the result of c6h5ch2cooh +H^+/KMnO4

science
in evolutionaly terms, RNA is though to have preceded proteins and DNA.

science
A car is moving at a speed of 72 km/hr. The radius of its wheels is 0.25m. If the wheels are stopped in 20 rotation by applying brakes, then angular retardation produced by the brakes is:

Science/Biology/Health and Social Care
What would happen if the body didn't have any energy? I have looked at Anabolism and Catabolism but I am overall, stuck answering this fully.

Science
What is the volume of the rock if the water level rises to the 120 ML mark

Physics, Math, Science
A 56 kg student is standing atop a spring in an elevator that is accelerating upward at 3.5 m/s^2. The spring constant is 2300 N/m. By how much is the spring compressed? I'm not exactly sure how to approach this problem, much less solve it. The acceleration threw me off, as my...

Science
Direction: Place a big mug, a plastic drinking glass and an empty glass bottle on the table with the big mug at the center, the drinking glass at the edge of the table, and the bottle anywhere on the table. With the force , shake the table and observe what happens to the mug, ...

Science
What is a substance that absorbs and reflects diffrent wavelenghts of light?

Science
What is When digital information is superimposed on a physical environment (two words)

science
How many drop (1drop=0.05ml) of 0.20M potassium iodide must we add to 0.010M Pb(NO3)2 to get precipitation of lead iodide to start if Ksp of lead iodide is 7.1x10^-9.

Science
What is a scientist who studies humans???

Science
What is When digital information is superimposed on a physical environment (two words)

Science
What is a substance that absorbs and reflects diffrent wavelenghts of light?

science
A steel rod of length 60 cm and radius 2.5 mm hangs vertically. If a mass of 2.5 kg is attached to the end of the rod, calculate the increase in the length of the rod

Science
Why is photosynthesis an example of a chemical reaction, and why is it classified as endothermic? Help please

science
When a ray of light travels from air to glass and it strikes the surface of separation at 90 degree,then what

SCIENCE
What is the purpose of wildlife corridors build under roads? 1) habitat fragmentation 2) habitat loss 3) habitat competition 4) habitat creation 2 ?

SCIENCE
Which of the following would be most likely lead to increased biodiversity? 1) clear cutting 2) oil drilling 3) national park planning 4) farming I thing 3

Science
a person watching through a window of an apartment sees a ball that rise vertically up then vertically down for a total time of0.5s.if the hieght of the window is 2m ,find the max hieght reached by ball above the window

Science
Nh4hs dissociates in a vessel at temp T K in the presence of 0.5 atm nh3. At equilibrium the pressure due to h2s is 1.5 atm.In a vessel V2 ( initially evacuated) the solid dissociates at T K.The total pressure at equilibrium in vessel V2 is P.and the weight ratio of nh3 and ...

PHYS-041-Keiler: Physical Science
A prehistoric bone is found at an excavation site. If the bone originally contained 22 kg of carbon−14, how much would remain after 11,400 years?

science
In The Darkest Part Of The Mansion, Where The Winds Are Set To High, A Man Fears His Presents, Where The Cotton Lies, Where Am I?

science
solubility of borax in 300 ml of water.

Science , Biology
Cretaceous extinction... The evidence tells you that “overwhelming evidence suggests that the extinction was caused by a 10-km-diameter asteroid that struck Earth.” Suggest at least three lines of evidence that might have led scientists to this conclusion. Could you please...

Computer Science (please help )
Prove that if A is any language over the alphabet {0}, then A* is regular.

maths
in a class of 40 children 3/8 likes english,2/5 likes maths and 3/4 like science .find the number of children who like each subject.

Science
One ship, sailing east with a speed of 7.5 m/s, passes a certain point at 8A.Mand a second ship sailing north at the same speed, passed the same point at 9:30 A.M. At What time are they closest together and what is the distance between them then?

science
What is the average speed of a race cow that travels 60 meters in 20 seconds?

science
A system contains 0.15 m3 of a gas at a pressure of 3.8 bar and 150 C. It is expanded adiabatically till the pressure falls to 1 bar. The gas is then heated at a constant pressure till its change in enthalpy is 70 kJ. Determine the total work done. 

Science
The radius of solid gold sphere is 0.5 cm ,if density of gold is 1.95*10qo power 8 kg/meter cube .Calculate its mass

science
Provide at least three examples of real-world applications in use or in development with reliable references.

science
Discuss current or future applications of nanotechnology in fields such as medicine, engineering, space exploration, fuel cell development, air and water purification, and agriculture.

science
Discuss how materials science has advanced to the stage where materials can be engineered to fit a specific purpose.

science
Provide an example of an application or object that is made of materials specifically engineered for that purpose.

science
Discuss scientific and technical concepts related to materials science for plastics

science
Molecular reactions involved when mohr'salt is provided to find the strength, molarity of KMnO4

science
An electron in the hydrogen atom makes a transition,an energy state of principal quantom numbers ni to n2 state if the photon emitted has a wavelength 434nm what is the value of ni

Earth Science
PLEASE HELP! URGENT! 7. Which letter arrows point to hanging valleys? 8. Which letter arrows point to aretes? 9. Name a peak on the map that is a horn. 10. Feature E on the map is composed of glacial till. What type of glacial feature is E, and how did it form?

Math
Science is the favorite subject of 73% of student at a school. There are 700 students at the school. How many of them like science best?

Science
The linear momentum of a car and truck are equal.which have more speed

science
A system contains 0.15 m3 of a gas at a pressure of 3.8 bar and 150 C. It is expanded adiabatically till the pressure falls to 1 bar. The gas is then heated at a constant pressure till its change in enthalpy is 70 kJ. Determine the total work done. 

Science
If The Force Of The Body Is 15 (N) And Travelled In A Particular Direction For 5 Second Calculate The Impulse

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, ...

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