Science

Recent Questions

science
Linear momentum of ball mass 50kg is0.5kgms-1find Velocity

Science
Compute the wavelength of an X-ray with a frequency of 6.0 1018 Hz.

Science
Find the megnitude of 2 forces.such that if they act at triangular,there is resultant √10N . If act at 60° the resultant is √13N ?

engineering science
a lifting machine is used to lift a load up to a height of 800mm when an effort moves through a distance of 4 m

engineering science
A horizontal force of 230B is required to pull a trolley 39 m, at a constant speed across a horizontal surface in 40 sec.1 the work done 2. The speed of the trolley. 3. Power required

Science
How long does it take the moon to go from full-moon phase to new moon phase? one week two week ~ (MY ANSWER) three week four week

Science
Use water to represent coastal areas and dirt to represent inland areas. How does the changing temperature differ for the different areas? What does this say about the temperature range for each location? What does that say about the climate? What does this question means?

science
write word equations and balanced chemical equations for each of the following reactions: a)calcium bicarbonate reacts with hydrochloric acid. b)magnesium hydroxide reacts with hydrochloric acid. c)Aluminum hydroxide reacts with hydrochloric acid.

Earth science
the land will heat up the most because _____ ???

Earth science
How do the heating of land and water compare?

Science
The reaction between sulphuric acid and iron (III) hydroxide [Fe(OH)3] gives

English
The question for my essay was to agree or disagree with: Some critics argue that you can only fully understand a piece of literature if you understand the historical events that were on going when it was being written. Others argue that each piece of literature is independent ...

science
what could be a good title for : if u r making a booklet were u have to make a spaceship.and writing about how to prevent heat loss in your spaceship

science
explain to to transfer heat from a electric stove?

Science
6.02 molecules of urea are present in100 ml of its solution . The concentration of urea solution is

Physical Science
Many people mistakenly believe that the astronauts who orbit Earth are "above gravity." Earth's mass is 6×1024kg, and its radius is 6.38×106m (6380 km). Use the inverse-square law to find a height above Earth's surface at that the force of gravity on a shuttle is about 89 % ...

Physical Science
A penny on its side moving at speed v slides off the horizontal surface of a table a vertical distance y from the floor. If the speed is 3.1 m/s and the coffee table is 0.30 m tall, find the distance the coin lands from the base of the table. (Use g=9.8m/s2.).

Physical Science
Using the formula for gravity, find the force of gravity on a 0.80-kg mass at Earth's surface. (The mass of Earth is 6×10^24kg, and its radius is 6.4×10^6m.).

science
Between a 700kg elephant moving at a velocity of 18km/h East and a 74kg cheeetah moving at 31m/s East. Which is more difficult to stop? Why?

science
All of the following factors are related to the plate tectonic model of the western coast of South America except the 1) length of the coastline 2) pattern of the earthquake activity 3) location of volcanoes 4) density of crustal plates 5) location of mountain ranges

science
The occurrence of earthquakes along plate boundaries indicates that the 1) plates are stationary 2) earth will eventually break apart 3) earth is shrinking 4) coast of California will break off and slide into the ocean 5) plates are moving

Science
Write the word equation to show the chemical reaction taking place during acid rain?

science
out of following solution which possesses lowest osmotic pressure,highest boiling point and highest frezzing point 1M KCl,1MNa3PO4 and 1M glucose.

science
is the blob fish going extinct or is it still common? and does it have any Limiting Factors?

science
if the force is increased to 60n for the same box what will be the acceleration?

science
suppose a box is 2kg is push with a force of 40n what is acceleration?

Science chemistry
Which compound has the melting point of -23 degree Celsius and boiling point of 77 degree Celsius ? Thx....

Physical Science
The A note has a frequency of 880 Hz. What is the wavelength if the speed of sound is 343 m/s? 0.39 m 2.57 m 537 m 301,000 m Which speed(s) is/are below the sound barrier in air? A. 257 m/s B. 1,030 m/s C. 10 m/s

Physical Science Please Check Answers?
I have difficulties understanding physical science and I'd really appreciate it if someone would check over the answers of my practice quiz. I have a test coming up and I really don't want to fail it. I marked my answers with a ******. Thank you in advance! 1. A transverse ...

Science
An Insect is magnified 12 times by a concave mirror. If the image is real, inverted and 6 cm away from the mirror, how far away is the insect? I need help in steps, when I tried the question I got a wrong answer

Physical Science 8th Grade
1. What is the resulting direction of a surface wave? Is it perpendicular, parallel, opposite, or circular? 2. What happens when a mechanical wave travels through a medium? What is transferred - mass, particles, energy, or waves? 3. Which of these waves cannot travel in a ...

science
According to the Lewis Acid/Base theory, what is the neutralization equation of Acid Nacl and Base AlCl3? NaCl+AlCl3----> (NaCl+AlCl3-----> Na+AlCl4 is incorrect)

science
a bullet of mass 20g is horizontally fired with a velocity of mass 150m/sec from a pistol of mass 20g.what is the recoil velocity of the pistol?

Math 5
A test in science is scored in the ff. way. Each correct response score 5 points while each wrong response scores 2 points. Ryan got 15 correct answers out of 20 item test. What was his score????❓❔

Science
According to the Lewis Acid/Base theory, what is the neutralization equation of Acid Nacl and Base AlCl3? NaCl+AlCl3----> (NaCl+AlCl3-----> Na+AlCl4 is incorrect)

computer science
QUESTION 1 When using the OR logical operator to connect 2 conditions to create a complex Boolean expression, neither the first condition nor the second condition has to be true for the complex Boolean expression to be true. True False QUESTION 2 String comparisons are ...

science
a particle is projected vertically upward from ground with velocity 10 m/s. Find which time particle reaches highest point?

science
Two charges placed at a distance r apart exert force F on each other at what distance will these charges experience same force in medium of dielectric constant K.

Science
Calculate average velocity of a minute hand of 5cm long from between 6am to 6:30am

Computer Science
I haven't done this before and I need some help starting this: A programmer is writing a total ticket price calculator for a theme park. The park offers the price of £13 per adults and £8 per child. There is a bulk purchase discount of 10% off the total price if there are ...

Science physics
The least count of a screw gauge is 0.001cm the diameter of a wire measured by it is 0.225cm. Find out the percentage error in this measurement

Science
750 ml of nitrogen are collected over water at 25•c and 740mm pressure of the aqueous tension at this temperatures is 23.8 mm hg. calculate the mass of dry gas

Science
A body is thrown vertically upwards with a velocity of 98m/s. If g=a=9.8 m/s when will it reach its highest point

physical science
An 85.0 kg man playing hockey catches a puck moving at 25.0 m/s. The man is initially at rest. The man and the puck move together after the collision. The puck's mass is 0.16 kg. What is the final velocity? A. 4.00 m/s B. 1.00 m/s C. 13.6 m/s D. 0.05 m/s

physical science
An 85.0 kg man playing hockey catches a puck moving at 25.0 m/s. The man is initially at rest. The man and the puck move together after the collision. The puck's mass is 0.16 kg. What is the final velocity?

science
one ballon is in the freezer and other is at room temprature wht is the size of baloon in freezer

Management Science
For your phone calls, you can either A) buy a prepaid monthly plan, or B) pay as you go. A cost $50 per month and calls are free up to 8hrs. Any extra min for that month will cost you $.25. B has a cost of $.15 per minute. What are the two total cost if you plan to talk for 5 ...

SCIENCE
(a) Calculate the pH of a 0.15M acetate buffer (a solution containing 0.1 mol/L acetic acid and 0.1 mol/L sodium acetate), given that the pKa of acetic acid is 4.7. (b) What would be the pH value after adding 0.05 mmol of sodium to 1l of 0.2 mol/L acetate buffer?

Science : Physics
Will an object accelerate if the forces are balanced? Why or why not? I know that the answer is that it will not accelerate but I'm having a difficult time explaining why.

science
calculate the momentum of a particle ,whose de Broglie's wave length is 0.1nm ?

Science : Physics
A 15kg object takes 26.3 meters to stop because of friction. Assume no skidding. If the frictional force is 60 N, what is the initial velocity of the object?

Physical Science
A food company uses a calorimeter to measure the amount of heat produced whena breakfast food is burned. The temperature of 100 ml of water changes from 10 degrees celcius to 45 degrees Celcius. How many calories are released?

science HELP PLZZ!!?!?!??!?!!??!
ok i need a little help.. I don't want to sound like a pathetic person but I need help with this question 19.What is global warming?what can people do to reduce global warming? I'm having a hard time... all I need some one to do is explain what it is and i will go from there ...

science
what is apical meristem

Science
An object is moving with uniform acceleration and it's velocity after 5 second is 25m/s after 8 second it is 34m/s find distance travelled by object in 12 second

Science
A body covers 80 meter in 7th second,124 meter in 9th second, how much shall it covers in 15 second?

science
two forces are in the ratio 1:2 named p and q.if their resultant is at an angle tan inverse root 3 /2 to vector p then the angle between p and q is ?

science
identify the type of reaction when hydrogen sulphide gas burns in oxygen to give water and sulphur dioxide

physics of science
a ball thrown vertically upwards with a speed of 20 m/s strikes a target after peneterating a distance of 0.01 in target.calculate the reterdation produced by target.

science
A skier with a mass of 60.0 kg starts from rest and skis down an icy (frictionless) slope that has a length of 53.0 m at an angle of 25.4° with respect to the horizontal. At the bottom of the slope, the path levels out and becomes horizontal, the snow becomes less icy, and ...

science
what is the unit of thermal capacity?

science
what is the concentration of the mixture of two mixture if two quarts of 30% acid solution is mixed with 3 pints of 20%acid solution

science
The mass of the girl in earth is 24kg. What is her mass and weight in moon if the moon's gravity is 1/6 of the earth' gravity?

science
Suggest an experiment to compare the conductivity of electricity by iron, copper, aluminium and zinc. Perform the experiment and prepare a short report on the resu

science
When you return to your house from school, what is your displacement

st.joseph science
Calculate the molecular formula of a compound whose empirical formula is CH2O AND vapour density is 30

science
3×10^18 photons of a certain light radiation are found to produce 1.5 j of energy. calculate the wavelength of light radiation

physical science
you are riding in a car traveling at 60mi/hr in a 50 mi/hr zone. you spot a policeman 10 feet ahead. you slow down with an acceleration of -2ft/sec2 for 3 seconds. Do you get a ticket

science
percentage of water of crystallization in Fe(NO3)2

SCIENCE
WHAT IS THE WORK OF MITOCHONDRIA

science
what is the ratio of SI units to CGS units of momentum? how do you measure the effect of an impulsive. force on the body

science
a bullet of 10g strikes a sand bag at a. speed. of 100…6m/s and gets embedded after traveling 5 cm. calculate 1) the resistive force exerted by sand on the bullet 2) the time taken by the bullet to come to rest

science
A chemist combines copper (Cu) and silver nitrate (AgNO3) in a beaker. She then "magically" pull silver out of the beaker. explain these results using your knowledge of chemical reactions.

science
1. What form of pollution, if any, does each energy source cause? 2. How does the economy influence energy source choices? 3. How does location influence energy source choices?

science
A gas in a sealed container has a pressure of 50 kPa at 27°C. What will the pressure of the gas be if the temperature rises to 87°C?

Science
Iodine-131 is used I'd diagnosing certain medical problems because of the short half-life, which is 8.02 days. Assume the hospital lab uses for 4.52g of iodine-131 in a month. What mass of this radioisotope remains in patients after 32 days?

engineering science
An aeroplane can fly at 250 km/h in still air.How long will it take it to reach a plane 500 km to south-east if a wind is blowing at 80 km/h from west?

Science
If 100 bacteria get into our body and reproduce every 20 minutes how many will there be in 2 hours? Search answer.

SCIENCE
A BRICK WITH MASS OF 6 KG IS DROPPED VERTICALLY FROM A CERTAIN HEIGHT. IT TAKES 4.5 SECONDED FOR THE BRICK TO REACH THE GROUND DETERMINE THE FF. THE HEIGHT FROM WHICH THE BRICK IS DROPPED THE SPEED OF WHICH THE BRICK THE GROUND IT AND THE MOMENTUM OF THE BRICK THE MOMENT JUST ...

science
what is IUPAC name of ch3-ch2-ch2-ch2=ch2 ???

Engineering science
A ball is thrown upwards and reaches the ground once again after 7sec how can I calc the total distance covered by the ball.

Health Science
(3) Write in full (i) H.I.V -Aids (ii) F.G.M

Health Science
Please help me. (2) Discus the following diseases under the following - heading) i. Causative agent ii. Method of transmision iii. Signs and symptoms iv. Control and prevent. 1-Gonorrhae 2- HIV and AIDS 3- syphiles.

Health Science
1a) What are controceptive b) Name six types of controceptive c) Name 10 diseases associated with the reproduction system. Please help me

Science
One of the least difficult wastes to deal with is nuclear waste. True False*** All the pluming fixtures and toilets should be low flow, which reduces the amount of water needed while still maintaining the pressure. True*** False American consumers have the lowest amount of ...

Science
The Environmental Defense Fund, The Friends of the Earth, and The Natural Defense Council, are all divisions of The Environmental Protection Agency. True*** False After the first Earth Day, the Sierra Club expanded to 20 states in 1970. In 1971, the anti-environmental group ...

math and science
A space shuttle with a mass of 4,06 X 10kg,orbits earth at a height of 720km above the surface of the earth.calculate the gravitational force experienced by the shuttle

Science Chemistry
A sample of beer is 4.6% by Mass C2H5OH. The density of beer is 0.93 g/mL. What is the molar concentration of C2H5OH in this sample of beer?

Science
Two bodies,one held 0.98m vertically above other,are released simultaneously and fall freely under gravity.After 2 seconds,their relative separation is?

science
A car covers 30 km at a uniform speed of 60km/h & next 30km at a uniform speed of 10km/h find the total time taken

science
how I can convert Fe(NO3)3.9H2O to aqueous solution containing 45%

Science
When we evaporate a salt solution salt crystals are left in the beaker or utensil but does the same thing happen in case of sugar solution?

Science
Oregon and Washington generate far more hydro-electric power than most states. How does all this hydro-electric power help keep our electric bills low (half the cost of electricity in many states)?

Science
What are two downsides to the dams that make all our hydro-electric power possible?

Science
Does Aldosterone increases or decrease urine production? Also does it result in higher sodium levels in the urine? Thank you

Science
If 10g of magnesium reacted with 5g of oxygen how much magnesium oxide would you produce? How do you know?

leadership development
1.Even though Mike is a great basketball player, he tries with just half effort on drills during practice. This is an example of A wasting talent B getting distracted C allowing others to set goals 2.Jim would like to get a summer internship, but his dad thinks he should work ...

science
why tall tree broke more than short tree at strom.

science
a man is running. What is its kinetic energy?

science and technology
Which law of chemical combination is illustrated by the fact that 168gFe reacts with 72gH2O to from 232gFeO4 and 8gH2?

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