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Recent Science Questions

science
calculate the number of molecules of hydrogen and carbon present in 4 gof methane.

science
what is the value f g on moon?

science
calculate the mass of 120 cc of nitrogen at NTP. How many number of molecules are present in it?

Science
Two forces whose magnitude are in the ratio 3 :5 gives resultant of 28. If the angle of their inclination is 60 °find the magnitude of each force

science
A spring fixed at one end can be streched by hanging standard masses from the other end. What masses is needed to achieve a stretching force of 5N?

Science
Which of the following is not a characteristic of life? A. maintains homeostasis B. composed of cells C. composed of atoms D. carries out metabolism C? Is that correct

science
what is the ratio between acceleration and velocity?

science
a 50 kg block is placed on an inclined plane with an angle of 30. then find the components of the weight (1)perpendicular (2)parallel to the inclined plane.

science
How to prepare 250ml (n/10) sodium hydroxide solution (NaoH)

Science
Which of the following is true? Mark all that apply. A. a hypothesis can be proved incorrect through experiment B. conclusions cannot disprove a hypothesis C. conclusions are made based on the analysis of data D. opinion is used to analyze data Is it A and C?

Science
Which of the following are examples of science? Mark all that apply. A. a journalist writes a story about a man who became rich by buying stock on Tuesdays B.a woman chooses an item to purchase based on its packaging C. a farmer consults a weather almanac to decide the best ...

science
list with match stick figures/give pictures of some exercises to release stress.

science
how will you separatea mixture of common salt,sand and iron fillings?

science
how are cohesion and adhesion properties of water linked to photosynthesis?

Science
If 50% if reactant is converted to product in first order in 25 minutes.how much of it would react in 100 minutes?

Science
A person can throw a stone to a maximum distance of 100m.the greatest height to which he can throw the stone is?

science
Why are pteriodphytes called most developed cryptogams

Science
A 500 kg horse pulls a cart of mass 1500 kg along a level horizontal road with an acceleration of 1m/s. If coefficients of the sliding friction between cart and ground is 0.2 then the force exerted by the horse on the cart in forward direction is:

maths
Ticket rate for the science exibition is 10rs for a child and 26 rupees for an adult. 740 rupees was got from 50person. How many children among them?

science
if a 3118tata commercial vehicle apply barke with abs system at the speed of 40km/h,how much distance cover to stop the vehicle speed of 0km/h

Science
What does sc mean on all jewlry items

Science
If a particle is projected at an angle of 30° to the horizontal with kinetic energy E then its kinetic energy at the topmost point would be?

Science
how do flowering plant that do mot have all four parts can make seeds?

Logical science
(1)weathering of rock is a ......?......Change.

Science
Explain the measures toreduce the problems associated with mining and extraction of metal

Logical science
Weathering of rock is a ......?...... Change.

science
Write an equation to show reaction of pop with water

science
What is the molarity of a solution of sodium chloride which contains 0.5moles in 200cubic centimeters? #2.what volume of 1m solution of hcl will contain 10moles?

science
list atleast ten healthy foods/smoothies/tonics with local produce that can help combat or reduse stress.

science
two vectors act at the same point on an object.a maximum resultant vector is obtained when the angle between these two vector is..

science
A car drives for 100km at an average speed of 80km.how long will it take the car to cover the distance

SCIENCE
A CRICKET BALL OF MALL 100G MOVING WITH A SPEED OF 30M/S IS BROUGHT TO REST BY A PLAYER IN 0.03 SECONDS FIND CHANGE IN MOMENTUM?

SCIENCE
TWO FORCES 8N & 10N AT AN ANGLE OF 30' ACTING ON A PARTICLE WHAT IS RESULTANT FORCE AND IT'S DIRECTION.

Science
A crow bar of length 2m is used to lift a stone of weight 200kg if the fulcrum is set apart from stone how much effort should be applied to the other end of the crowbar to balance it?

Science (Biology)
In a species of rodent, fur colour may be black or brown and their tail length either long or short. A pair of rodents were crossed, and their progeny then allowed to interbreed. The result in the F2 were as follows: 29 with brown fur with long tails; 9 long tailed with black ...

science
a cricket ball of mass 0.2kg moving with a velocity of 0.4second. find the average force.

Science
40 degrees north runs along 146th street on the north side of Indianapolis. What is the rotational velocity of the surface of the earth at 40 degrees north?

science
a bullet is fired with velocity 55m/sec at a target.if if the sound of collision heard after 7second.find the distance between target and gun.(speed of sound in air=330m/sec

PACE INter Science Colldege
what is average rate in cm3/s of gasoline to the engine of a car travelling at 100km/hr if it averages 10km/l?

Science, English, math
Why do we live

Science
Pressure is 50N/m2,area is 600cm2.Find force

Science
A motor boat starting from rest on a lake accelerate in a straight line at a constant rate of 3m/s for 8s. How far does the boat travel during the time?

Science
When did the first human exist? And when did they start populating the earth?

physical Science
Sodium azide fully decomposes at 300 degrees celcius at a volume of 3,5 cubic decometer,calculate the mass of sodium azide pellets used

science(physics)
A bullet of mass 100g moving with20m/sec .Strikes a wooden plank and peretrates up to 20cm.Calculate the resistance offered by the wooden plank.

Science
What is physics

science
Ice has a critical angle of 49.8 degrees, explain or rectangular prism of clear ice can be used for the total internal reflection of light by 90 degrees

Science
How many grams of hydrogen chloride are percent in 250cm3 of comercial 37% by mass hydro chloric acid solution? The density of the acid is 1.19gram/cm3.

Science
What is the concentration off alcohol solution that was prepared by dissolving 40cm3 ethanol in 160cm3 water

Science college question
An object is placed 3cm in front of a convex mirror whose focal length is 12cm where is the image formed and what is it's nature

Science
How fast would a 20gram marble have to go to travel 9.5 inches. (Flat surface)

Physical Science
Green light has a frequency of about 5.3Hz×1014Hz. Using the relationship c=fλ, find its wavelength in air.

science
The initial and final temperatures of a liquid are (67.7+0.2)°C and (76.3+0.3)°C . Calculate the rise in temperature.

Science
What is the kinetic energy of 0.5 kg soccer ball that is travelling at a velocity of 3m/s?

science
What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm3

Science
Arun has prepared 0.01 percent of solution of sodium chloride in water .Clculate mass of solute and mass of solvent.

science
why the unit of work and energy are equal?

Science
I can be traced back to 3000bc, often go unnoticed, can be overhead, under feet or somewhere in between, evolution has changed me, am lighter than I used to be, and can protect your investment.

science
When a body hanging form a spring balance is immersed in water it floats just below the surface of water and shows 100 g loss in its water ? (1) what is the weight of the body in water? (2) what is the weight of the body in air? (3) what is the upthrust on the body? (4) what ...

SCIENCE
WHAT CAN BE THE ARRANGEMENTS OF PARTICLES IN MERCURY

science
According to chance what fraction of their children will have dimples?

physical science
which sibstance has the least number of drops that can fit on the coin?

science
a bullet of mass 20g traveling horizontally at 100m/s embedded itself in the center of block of wood mass 1kg which is suspended by a light vertical string of length

science
graphic organizer about the three type of boundary

MATHS
THE AVERAGE MARK OF 4 GIRLS IN A SCIENCE TEST IS 6,THE MARKS OF 3 OF ZM ARE 5,7,4.FIND THE MARK OF THE 4TH GIRL.

Science
The potential energy of a projectile at its maximum height is equal to its kinetic energy there . If the velocity of projection is 20m/s its time of flight is ?

science
3 charges are arranged along the x-axis. q1 = -4.50 nC is located at x = 0.200m q2 = +2.50 nC is located at x = -0.300m q3 = is a positive character located at the origin. What is the value of q3 for the net eletric force on it to be 4*10^-6 N? I found the charge on q3 to be...

Fpb science
Find gew of d following Kmno. K2cr2o7. Kno3

science
When the balloon has deflated, is there any difference between the air pressure inside and outside of the balloon? Explain. Please explain i don't understand it ASAP

Science
1.Two stones are dropped from the top of a tower at an interval of 3 seconds.the relative velocity of the first Stone with respect to the stone at any instant during their fall is?? 2.if density, acceleration and force are taken as basic quantities, then time period has ...

science
all acids are not corrosive.justify this statement

science
The rate constant of a certain reaction is given by log K= 212/T Calculate the activation energy at 400K.

science
Give two reasons why the pressure decreases as blood flows along the capillary bed. =because it avoide the mixed up of the blood

science
A cricket ball of mass 0.4 kg moving with a velocity of 72 km/h is brought to rest by a player. Find the magnitude of the average force exerted by the player? we have, F= m x a to find acceleration we want either dist(s) or time(t) it is not given how to find they have given ...

science
a satellite is moving in 36000km if it takes 24 hour what will be the speed?

science
what is the equation for velocity?

science
which physical quantity is given under the area of velocity time graph?

Science-light
Shawn wanted to find out which of the four materials A, B, C and D allows the most light to pass through. He was given the following items: - A torch - A ruler - A light sensor connected to a datalogger - Four different materials A, B, C and D Shawn carried out his experiment ...

Science
Calculate the amount of water produced by the combustion of 44g of propane and 16g of methane.

Science
If you weigh 300 N on earth, then what is your mass and weight in mars?

science
6.025*10^20 molecules of acetic acid are present in 500 ml of its solution .What is the concentration of the solution?

science
if the velocity of a progressive wave with a periodic frequency of 10khz is 330m/s.calculate it's wavelength.

Science
2kg water vapour 100degrees is condensed to water at 40degrees. The quantity of heat required?

science
advantages and disadvantages of difusion

science
5% w/v aqueous sodium chloride from this i have to prepare 1.6% w/v aqueous sodium hydroxide solution

science
A body of mass 20 kg has a momentum of 120 kgm/s.find its vvelocity?

science
how to remove blue color from ammonium sulfate solution which occurs dues copper content in the spent acid we generate

Math
Ivan finished 4/5 of his math homework problems and all 3 questions for his science homework before dinner . If he finished a total of 43 problems before dinner , what is the total number of math homework problems he was assigned?

science
what are some examples of suspension?

science
what are some examples of a suspension? i need help!!!

science
A particle is dropped from height 100m and

science
Athlete of mass 70.0kg runs a 1000m race in 10 seconds calculate the kenetic energy possessed by the body

science
What mass of limestone will produce 11.2g of lime

science
if the velocity of a progressive wave with a periodic frequency of 10KHz is 330m/s. calculate it's wavelength.

science
Why is ozone can be describe as our friend

Science
Explain functions of water?[6]

science
I have 20%solution ofH2So4,100litres. I want 40%solution of 200lit. How many liter mix solution ofH2So4 of 98%

Science
Is a diploma a valuable asset?

science
37. The temperature at sea level on the windward side of a mountain is 28 °C and the dewpoint is 18 °C. What is the LCL?

Science
The molarity of a concentrated acid is 1.15M .what volume of HCl is required to make 1l of 0.1M HC

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