Science

Recent Questions

Science
a body of mass 500g moving at 5m/s comes to rest after covering a distance of 5m.find the retarding force acting on it.

SCIENCE
A student measures a rectangular room to be 20.0 m * 17.16 m. Which of the following numbers represents the room's area with the correct number of significant figures? 340 m^2 343 m^2 343.2 m^2 343.20 m^2

Math
Several students were surveyed about their favorite class. 26 students chose art 19 English 21 math 16 music 32 science. What fraction of the of the students chose music as their favorite subject.

Math
Several students were surveyed about their favorite class. 26 students chose art 19 English 21 math 16 music 32 science. What fraction of the of the students chose music as their favorite subject.

SCIENCE NOW
an experiment was conducted to test which of two antibiotics was more effective at killing a certain type if bacterium cultures a and b were treated with antibiotic 1; cultures c and d were treated with antibiotic 2; culture e was not treated with antibiotic. based on the ...

SCIENCE
state at least one possible source of bias in an expirament and describe how you can reduce it.

SCIENCE NOW
state at least one possible source of bias in an expirament and describe how you can reduce it. plz help

science
things people must have to survive

science
A concave lens or focal lens 10cm produce an erect image 40cm from the lens .Determine the object distance and magnification.

Science
Which of the following identifies a measurement, its SI units, and the tool most commonly used to measure it? a. length, meter, ruler *** b. temperature, degrees Fahrenheit, thermometer c. weight, gram, scale d. volume, millimeter, meniscus Why do scientists use standard units...

Science
Which of the following identifies a measurement, its SI units, and the tool most commonly used to measure it? a. length, meter, ruler *** b. temperature, degrees Fahrenheit, thermometer c. weight, gram, scale d. volume, millimeter, meniscus Why do scientists use standard units...

Science
A gas has an initial volume of 2.5 L at a temperature of 275 K and a pressure of 2.1 atm. The pressure of the gas increases to 2.7 atm, and the temperature of the gas increases to 298 K. The final volume of the gas, rounded to the nearest tenth, is

Science, chemistry
During the experiment, 100ml will be required to prepare 0.5M solution of NaNO3. Calculate the mass of NaNO3 in grams that will be required.

Science
A student measures the mass of a paper clip. The student’s data table is shown below. The accepted value for the paper clip’s mass is 1.14 g. Trial 1, 2.45 g Trial 2, 2.40 g Trial 3, 2.42 g Which of the following describes the student’s measurements? a. The student’s ...

science
When enough experimental data support a hypothesis, the hypothesis then becomes a fact theory inference conclusion I am torn between theory and conclusion

science
. How does changing volume change the density of an object?

life science
state the aim of this investigation

science
a body of mass 2kg is suspended by a rope and is pulled to aside by a means of horizontal force ,so that the rope makes an angle 45 degrees with the vertical the horizo ntal force is

Science
Do the shoes help the basketball players , run across the court ?

science
do fruits and vegetables contain bases

Science
A stone is dropped from 78.5 m ,after 1 sec,another stone is dropped,both reach the ground at the same time, calculate the speed of second ball.

science
Ryan wants to identify an element. Which piece of information would best help Ryan identify the element?

Science
Imagine you designed an experiment that investigated the effect of feeding yeast cells different concentrations (0, 5, 10, 15, 25%) of sugar solutions. The yeast used the sugar to do cellular respiration and make CO2 as a waste product. The volume of CO2 released was captured ...

Math science
If the numbers never end is zero the end number?

Science
Find linear momentum when a stone of mass 50kg is thrown from a height 10m

Science
Force 4n,3n and 12n act at a in point mutually perpendicular directions .The magnitude of resultant force is

science
1. Which of the following is a good study habit? (1 point) a.maintaining a positive attitude b.waiting until the last minute to start on an assignment c.listening to the television while studying d.studying when you are tired

science
Molecular formula of silica is?

Science
Giant kelp has gas-filled sacs to help it float so it can do what

science
Molecular formula of silica is?

Science
The efficiency of a machine is 80%.calculate,the amount of energy needed by the machine to do work of 150joules.

science
What information does an equilibrium constant give about a reaction? A. It tells how long it takes the reaction to reach equilibrium. B. It tells how much energy is required for the reaction to happen. C. It tells what the rate constant of the reaction is at equilibrium. D. It...

science
Which rate constant would result in the fastest reaction? A. 1.3 × 103 L/mol · s B. 2.8 L/mol · s C. 9.5 × 10-2 L/mol · s D. 4.2 × 10-3 L/mol · s is the answer for this one c?

science
A graph of experimental data is a straight line when ln[H2] is plotted versus time. Which rate law fits the data? A. Rate = k(ln[H'small2']) B. Rate = k/[H'small2'] C. Rate = k[H'small'2] D. Rate = k[H'small'2]^2

science
If a reaction rate increases with temperature, how will the rate constant of the reaction change with temperature? A. The rate constant only changes upon addition of a catalyst to the reaction. B. The rate constant will decrease with temperature. C. The rate constant will not ...

Science
Suppose u walk across the room of length 9 m with the velocity of 1.5m perhr. Calculate the velocity in m/s and the time taken to move across the room

Science
How many millilitres of water must be added to 30 mL of 10 M of HNO3, so that the solution concentration is reduced to 0.2 M?

Science
A racecar driver steps on the gas, and his car travels 16 meters in 2 seconds, starting from rest. What is the average velocity in m/s and km/h?

SCIENCE
When a student added Zinc granules to dilute HCI, a colorless and odorless gas was evolved, which was tested with a burning match stick, it was observed that: (a) The match stick continued to burn brilliantly. (b) The match stick burnt slowly with a blue flame. (c) The match ...

science
a bkock placed on a rough inclined plane of length 4m just begins to slide down when the upper end of the plane is 1m high from the ground.calculate the coefficient of static friction.

science
what type of magma flows very fast

Science
A race car driver steps on the gas, and his car travels 16 meters in 2 seconds, starting from rest. What is the average velocity in m/s and in km/h?

science
While exploring a cave, a spelunker starts at the entrance and moves the following distances. She goes 75.0 m north, 250 m east, 109 m at an angle θ = 30.0° north of east, and 156 m south. Find the resultant displacement from the cave entrance. The figure below suggests ...

Science
Bart believes that mice exposed to microwaves will become extra strong (maybe he's reading too much Radioactive Man). He decides to perform this experiment by placing 10 mice in a microwave for 10 seconds. He composed these 10 mice to another 10 mice that had not been exposed...

science
1. Liquid phosphorus trichloride, PCl3 is made by the direct combination of phosphorus and chlorine. a. What is the maximum mass of PCl3 that can be produced from 125 g of P4 and 323 g Cl2? b. What mass of P4 remains after the reaction?

Physical science check my answers
5. Steve's older brother got this cool new car. He said it can go from a stopped position to 80 miles per hour in ten seconds. His brother is describing the car's A. acceleration. *** B. average velocity. C. instantaneous speed. D. average speed. 6. Radar devices are used by ...

Physical science check my answers
2. On my bike, I was able to travel 40 miles in one hour. From this information, we can determine the bike's A. speed. *** B. velocity. C. acceleration. D. direction. 3. The local news team is tracking the storm and has reported that it is traveling north, northwest at 20 ...

science
Does hydrogen undergoes reduction or oxidation on the basis of oxidation number in 2NH3 +H2SO4 which gives (NH4)SO4

science
The half-life of carbon-14 is 5730 years. If we start with 10 grams of carbon-14, after 5730 years, we will have _____ of carbon-14 left.

science
What is the oxidation number of Si in (CH3)2SiCl2

science
2. How many grams of 96.5% pure NaOH pellets do you need to make 1.000 liter of 1.50 N NaOH?

science
how to balance chemical equations with redox reaction Cr(OH)3 + IO3{-} + OH{-} = CrO4{-2} + I{-}

science
what is the action of chlorine gas on ethane

Science - Please Look!
The senses are used to make which of the following? inferences predictions evaluations ((**observations**)) You walk into the kitchen and see a broken egg on the floor. Which of the following is an inference you can make based on this observation? ((**The egg rolled off the ...

Science
A transvers wave traveling on a rope is given by y=0.25 sin(0.3 radX-40radt), where y and X is expressed in meter and t is in seconds. Determine a-Amplitude. B-frequency C-Direction of motion. e-Displacement at X=0.6 m and t=2.3 s. Please help me

SCIENCE
A farmer believes that fertilizer runoff from a farm is killing the fish in a nearby pond. The farmer measures the amount of fertilizer in the pond each week and counts the number of dead fish. The measurements indicate that, as the fertilizer concentration increases, the ...

SCIENCE
1. WHICH OF THE FOLLOWING IS MOST LIKELY TO RESULT IN A SCIENTIST DRAWING WRONG CONCLUSIONS? A. CONDUCTING A DOUBLE-BLIND TEST B. CONDUCTING A CONTROLLED EXPERIMENT C. PREVENTING OPINIONS FROM AFFECTING DATA COLLECTION D. GATHERING DATA FOR A BRIEF PERIOD OF TIME D

Science
What is the function of the nucleus in a cell? A.The nucleus controls the cell’s activity.** B.The nucleus identifies a cell as belonging to a plant. C.The nucleus determines what substances enter and leave the cell. D.The nucleus can be seen under a transmission electron ...

Science
What safety rules should I follow before, during, and after a laboratory investigation?

Science
Which of the following is not part of the cell theory? A.Cells are the building blocks of life. B.All living things are made up of cells. C.All cells are created from other cells through cell division. D.The nucleus is the control center of the cell.***

science
an electron orbiting around hydrogen atom in circular orbit of radius 1armgstrom with the speed of 5*10^6 m/sec. Calculate magnetic field produced at the nucleus?

Science
Can air be pumped into the container completely filled filled with water?

science
Which rate constant would result in the fastest reaction? Which rate constant would result in the fastest reaction? 1 1.3 × 103 L/mol · s 2 2.8 L/mol · s 3 9.5 × 10-2 L/mol · s 4 4.2 × 10-3 L/mol · s

science
A graph of experimental data is a straight line when ln[H2] is plotted versus time. Which rate law fits the data? 1 Rate = k(ln[H2]) 2 Rate = k/[H2] 3 Rate = k[H2] 4 Rate = k[H2]2

science
The half-life of carbon-14 is 5730 years. If we start with 10 grams of carbon-14, after 5730 years, we will have _____ of carbon-14 left.

Science
Wht is acid,base,and salts.

Physical science
Two charged spheres P and Q have charges of+3C and -6C respectively.how far apart must the spheres be placed so that they exert an electrostatic force of 5 N on each other

Science Chemistry
Calculate the no. of grams of NaOH req. to absorb volume of the CO2 gas produce as Na2CO3

Science
A simple pendulum oscillates with an amplitude of 30 degrees. If the length of the string is 1.0m. Calculate the velocity of the pendulum bob at its lowest point.

science
Kinetic energy is the type of energy that is associated with: A. kinds of gases. B. electricity. C. motion. D. position.

science
What is the strongest intermolecular force that occurs between methane (CH4) and ammonia (NH3)? A. Dipole-dipole forces B. Hydrogen bond C. London dispersion forces D. Dipole-induced dipole attractions

science
A Geiger counter is used to measure the activity of a sample of iodine-131. Based on the data, what is the half-life of iodine-131? A. 16 days B. 8 days C. 4 days D. 12 days

science - chemistry
How can we separate a mixture of iodine, napthalene, chalk dust and saw dust. Write the ans in the form of a flow chart.

science
Which of the following terms are present in the rate law? A. The rate constant, the concentration of the reactants, and the order of the reactants B. The rate constant and the concentration of the reactants C. The rate constant and the temperature of the reactants D. The rate ...

SCIENCE
What are the differences between a hydrogen filled balloon and an air filled balloon flying or moving in air?

SCIENCE
Why does one feel difficult to breathe in a deep well while cleaning it?

science
How many atoms of carbon are needed to produce 0.45 mol Al? 3C + 2Al2O3 4Al + 3CO2 A. 2.6 × 1026 atoms B. 9.7 × 1024 atoms C. 3.0 × 1022 atoms D. 2.0 × 1023 atoms

Science
A helium tank has a volume of 8.0 L. It contains enough helium to fill 23 circular balloons with a radius of 15 cm at a temperature of 25.0 C (room temperature). Assume that the pressure inside the balloons is 2.0 atm. What volume would all the gas in the tank occupy at 2.0 ...

science
49. A researcher writes a grant proposal to repeat an experiment that was recently published by another researcher. Which of the following statements best supports the grant proposal? A. Funding this grant proposal will allow this laboratory to continue to study this topic. B...

Science
Design of a fourth order low pass filter with 150 Hz frequency for ecg acquisition

Science
What do you mean by resultant vector?

science
Fifty grams of ice at 0 degrees celcius is added to 200grams of water at 40 degrees celcius contained in a 100 grams copper calorimeter. If the final temperature of the mixture is 16 degrees celcius, find the heat of fusion of ice.

Physical Science
How many significant figures should the product 62.25 * 37.4 have ? a-2 b-3 c-4 d-7 my answer is c or 4

Science
Is Gelatin a suspension?

Science
You are exercising on a hot day. Your body temperature goes up. You begin to sweat. The sweat cools your body. Sweating is an example of: A. Input B. Process C. Output D. Feedback I'm not sure whether it is C or D...someone please help?

science
what is Newton first law

science
The boy A weighs 50 kg and the girl B weighs 35 kg in a seesaw...the board of the seesaw is 3.6 meter... To balance the seesaw where should girl C who weighs 25 kg seat or what particular distance should girl C seat to balance it

science
Calculate the % yeild of the reaction if 64 g of NaBH4 with iodine produces 15_g of BI3

science
Which of the following is an example of heterogeneous catalysis? A. Ethylene and hydrogen gases are adsorbed onto the surface of a metal catalyst to accelerate the formation of ethane. B. An enzyme catalyzes a biochemical reaction that produces the alcohol and CO2 gas in beer...

science
How would the fraction of successful collisions change with an increase in reaction temperature? A. The fraction of successful collisions would decrease. B. The fraction of successful collisions would remain unchanged. C. The fraction of successful collisions would increase. D...

science
What order is the radioactive decay of carbon-14, an unstable isotope of carbon? A. Third order B. Second order C. Zero order D. First order

Science work
A reaction is thought to be second order with respect to the concentration of carbon monoxide. What evidence would support this? Answer options... A. Changing the initial concentration would have no effect on the rate. B. Any change in the initial concentration would cause a ...

Science - Chemistry
If the rate law of a chemical reaction is k[NH4+]2[NO2–], what is the order of the reaction? 1. The order of the reaction cannot be determined. 2. 3 3. 1 4. 2

Science help pleaseeeee?!?!
A gas has a volume of 4.25 m3 at a temperature of 95.0°C and a pressure of 1.05 atm. What temperature will the gas have at a pressure of 1.58 atm and a volume of 2.46 m3? A. 356°C B. 82.7°C C. 47.5°C D. 321°C

Science
Which of the following is not a postulate of the kinetic molecular theory? A. The collisions between gas molecules are elastic. B. The energy of a gas molecule is determined by quantum mechanics. C. Gas molecules travel in random, straight paths. D. The absolute temperature of...

Science
A farmer wants to determine if a new fertilizer gives her a better crop yield than her old fertilizer. She spreads the old fertilizer in field A, which has a brand new irrigation system. She spreads the new fertilizer in field B, which has an irrigation system that will be ...

Science
how does an individual’s genetic makeup interact with nutrition, smoking

Science
A student measures the volume of a liquid and finds it to be 40 mL. How many significant figures are in the measurement? A) 1*** B) 2 C) 3 D) 4 Is this correct? I'm not entirely sure if it's 1 or 2...

Science
25n . 8 seconds how much power ?

Science
A scientist studying the effects of gamma rays on marigolds gathered the data shown below. Hypothesis: Marigolds exposed to higher levels of radiation will not grow as well as marigolds that are exposed to less radiation Plant A: Gamma Rays (Rad/day) is 5. Water (mL/week) 50. ...

  1. Pages:
  2. <<Prev
  3. 23
  4. 24
  5. 25
  6. 26
  7. 27
  8. 28
  9. 29
  10. 30
  11. 31
  12. 32
  13. 33
  14. 34
  15. 35
  16. 36
  17. 37
  18. Next>>