# Science

## Recent Questions

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

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?

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?

science
A 1000kg rocket is set vertically on its launching pad. The propellent is expelled at the rate of 2kg/s. Find the minimum velocity of the exhaust gases so that rocket just begin to rise. Also find rocket's velocity 10second after ignition, assuming the minimum exhaust velocity.

Science
Why is that instantaneous rate of reaction does not change when a part of the reacting solution is taken out?

science
The resistance of 10m long wire is 10 . Its length is increased uniformly by 25% by stretching the wire uniformly. The resistance of wire will change to (approximately) (A) 12.5 (B) 14.5 (C) 15.6 (D) 16.6

Physical Science

Science
Your journey to the centre of the earth took 64 hours at 100km/h. What was the total distance you traveled??

basic science
calculate the work done when a person pushes a car from its stationary position to a distance of 50m applying a force of 200n

Science
A 450-g block is attached to a spring of spring constant 45 N/m and is in simple harmonic motion on a frictionless surface with an amplitude of 7.5 cm. A second identical block, moving at 12 m/s in line with the spring, strikes the first one when the spring is at its maximum ...

Science
CU+H2SO4>CUSO4+H2O+SO2

Science
What mass of iron metal can be obtained from the reaction of 45.6kg Iron (III) oxide Fe3O4 with carbon monoxide CO as given in the following equation? Fe3O4 + 4CO = 3Fe + 4CO2

SCIENCE
a 2cm high object is placed at a distance of 20cm from concave mirror ,the real image is formed at 40cm from the mirror.calculate the focal length,size of image and magnification?

Science
The volume of a gas increases from 18.7 m3 to 25.1 m3 while the pressure changes from 1.82 atm to 1.41 atm. If the initial temperature is 353 K, the final temperature of the gas is K.

science
What are some ways to minimize impacts a water dam creates on the ecosystem?

Math
1. Subtract (4x + 2y) – (8x – 3y). –4x – y 12x – y 12x + 5y –4x + 5y 2. Determine the best name for the quadrilateral. Graphic rectangle rhombus trapezoid parallelogram 3. Which figure has rotational symmetry for an angle of rotation of 270°? graphic graphic ...

Science
What mass of iron metal can be obtained from the reaction of 45.6kg Iron (III) oxide Fe3O4 with carbon monoxide CO as given in the following equation? Fe3O4 + 4CO = 3Fe + 4CO2

Science
What is the equation of the street line that passes through the points 1 and -4 and 3 and 2

Science
A student wants to neutralize 1000 ml of .25m lioh with 0.75m hbr. How much hbr are they expected to use? Sho your work.

Science
what is the concentration of sulfuric acid if 0.25l of it is neutralized by 0.56l of 0.030m koh?

Science
Which symbol correctly represents an element (D) whose atoms contain 15 protons and 20 neutrons? A. 20/15 D B. 15/20 D C. 35/15 D D. 15/35 D C?

Science
Which of the following statements is not consistent with the results obtained in Rutherford’s gold foil experiment? A. The nucleus of an atom is positively charged. B. The nucleus of an atom contains almost all the mass of the atom. C. Atoms are composed mainly of empty ...

Science
In order to analyze the wastewater containing cu2+ from a manufacturing process, 1.0L of water was evaporated to 10.0mL, then placed in a spectrophotometer tube. The absorbance was found to be 0.30. Using your calibration curve, calculate the number of milligram of Cu2+ in 1....

science
a farmer has sown seed too deep. what is he likely going to observe?give reasons.

Science
Shale often contains fossils of leaves. Question: If the gastropods listed in line 3 and line 6 were collected from shale containing leaf fossils what would their possible age be? Question: Could you use radiocarbon dating to assign a numerical date/age to this rock unit? ...

Math
Jason measured rainfall for a science project. Last week it rained 3 1/8 inches in all. This week it rained 1 7/8 inches in one day and 2 3/4 inches on another. How many more inches did it rain this week then last week? Please explain how you got your anwser

Science
what the definition of age range in earth science?

Science ~ Astronomy
Which evidence provides support for the nebular theory: a) scientists have observed the formation of a distant solar system b) the nebular theory has been proven mathmatically c) astronomers have observed protoplanetary disks around distant newborn stars d) none of the above I...

Science
Why Devonian could not be considered an index fossils? How can the occurrence of fossils and their known age ranges be used to date rocks? Need help by understanding the question.

Final length of the bar of copper whose original length was 75mm When heated through 50 degrees

Science
Which of the following is true concerning the Little River Salt Marsh Restoration Project? a. It revolved around restoring tidal flow with culverts. b. It is a 20 year old conservation effort. c. It was immediately successful upon inception. d. It used massive water pumps to ...

Science
How can the occurrence of fossils and their known age ranges be used to date rocks?

Science/Anatomy
I have the formula to the problem but am unsure of my answer.. Problem: Calculate the cardiac output if heart rate (HR) is 90 beats per minute, stroke volume (SV) is 110 ml/beat, end diastolic volume (EDV) is 140 ml, and end systolic volume (ESV) is 30 ml. select corect answer...

Co-efficient of cubical expansion

Final length of the bar of copper whose original length was 75mm When heated through 50 degrees

maths,science, physics
A block of mass 50kg was left to slide down a ramp elevated at an angle of 45 decrease as shown in the diagram below (assume g=9.8 ms^-2). I . Calculate the net force causing the block to slide down the ramp (assume no friction) II. Calculate the net force causing the block to...

Science
Calculate the mass of 3.20 mol of sodium hydroxide, NaOH. M(NaOH) = 40.0g mol-1 Would the following be the correct workings? n= 3.20 mol M=40.0g mol-1 m(NaOH) = n x M = 3.20 mol x 40.0g mol-1 = 128 g NaOH Is this the correct workings?

maths,science, physics
A toy locomotive of mass 420g moving at 30cm s^-1 south collides with a carriage of mass 200g moving at 30cm s^-1 north. If they become couple together, what is their common velocity after the collision?

maths,science, physics
A bullet of mass 20g is fired from a rifle of mass 4kg with a speed of 500ms^-1.Calculate the initial velocity of the recoil of the rifle.

maths,science, physics
A mass of 2kg resting on a smooth level table is connected by a light in extensible string passing over a frictionless pulley to a suspended 3kg mass (imagine as shown on the diagram).Find: I.The tension in the string. II. The magnitude of the acceleration of the two masses. ...

maths,science, physics
A small cart of mass 300g when emty can move freely on a horizontal surface. The cart contains 100g of sand and moves initially with speed of 18cm s^-1. a)what would be the speed of the cart if a further 200g of sand were dropped vertically into it from a stationary container...

maths,science, physics
A truck of mass 4×10^3 moving at 3.5 ms^-1 collides with a stationary truck to which it becomes automatically coupled. Immediately after the impact the trucks moves along together at 2 ms^-1 in the same direction. Find the mass of the second truck.

science
The 140-million year-old fossil of a tortoise was recently found about 700 meters deep in a coal mine in northeast china. Scientists studying the fossil believe that it represents a previously unknown species? Which of the following is the best conclusion based on the data ...

English
Hello. Dear Ms.Sue, I would be very grateful for your advice. 1) Do you think it's possible to say "the holistic phenomenon of science" (meaning "science as a whole")? 2) Do you think I used the articles correctly in the following "the interaction of the cultural, public and ...

science
Ms. Sue did you forget about my other questions?

science
right-handers exhibited an equal or more active brain response in slightly more than one-fourth of the drug trials, compared to left-handers. This statement should be classified as 1 the problem= the main issue or subject being investigated in the study 2 a method= a procedure...

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