A stone from a window with an initial horizontal velocity of 10m/s. If the window is 20m high, and the ground is level, how many seconds will the stone reach the ground? How far on the ground will it reach?
Sunday, February 7, 2016 by nova
A person stands between two cliffs and fires a gun.he hears two successive echoes in 2 seconds and 5 seconds after the gun was fired. Find the distance between the two cliffs?
Sunday, February 7, 2016 by lovepreet singh sidhu
Determine the magnitude and direction of a resultant force on 500N,200N and 300N by calculating or by accurate construction and measurement use scale 10mm=50N
Saturday, February 6, 2016 by mongi
Hydrogen peroxide can be prepared in several ways. One method is the reaction between hydrogen and oxygen, another method is the reaction between water and oxygen. Calculate the ΔG°rxn of each reaction below? 1) H2(g) + O2(g) <==> H2O2(l) ΔG°rxn=? (in ...
Friday, February 5, 2016 by Dan
2._____ clouds form at heights of 2,000 meters or less. A.Cumulus B.Cirrus C.Cirrostratus D.Altocumulus Erosion caused by waves can destroy ____. A.Rocky shorelines B.Sandy shorelines C.Beaches D.All of the above The horizontal distance between the highest or the lowest points...
Friday, February 5, 2016 by Debbie
Which of the following activities would contribute the most to global warming? -driving a solar-powered car -snowmobiling around a national park(i picked) -launching an engineless glider -trekking by horseback
Friday, February 5, 2016 by ???
which of the following is a consequence of using fossil fuels as an energy source decreased carbon dioxide levels increased biodiversity increased acid rain decreased ecosystem disruption
Friday, February 5, 2016 by kyran
Science: Drifting Continents
Sandstone is a sedimentary rock. Which of the following characteristics would you look for in a piece of sandstone? A) Rock has sparkly or alternating color layers that are bent or folded B) Rock has layers and smaller pieces of rock in it. It also has fossil in it C) Rock has...
Friday, February 5, 2016 by TikiKiwi
A researcher wants to develop a new pharmaceutical compound to treat pain. Which of the following strategies will likely be the most effective process? A. Test extracts from newly discovered plants for pain-killing substances. B. Read anthropological studies to discover plants...
Thursday, February 4, 2016 by Jewels
Two identical masses are moving down a slope. One mass is traveling twice as fast as the other mass. How does the kinetic energy of one mass compare to the other? a. The faster object has the same kinetic energy as the slower object. b. The faster object has less kinetic ...
Thursday, February 4, 2016 by shynice
science help PLS
An astronomer see a star that is very far away but still very bright. What can she conclude about the star? The star must be very large. The star must be very small. The star must be moving away from Earth. The star must be moving closer to Earth.
Thursday, February 4, 2016 by Oscar
In what way is geography an integrative science? a. Geography is an integrative science because it examines Earth in both physical and human terms.*** b. Geography is an integrative science because it borrows from physical sciences such as chemistry, biology, meterology, and ...
Thursday, February 4, 2016 by Kaai97
Some constellations, such as Ursa Minor, are visible in the sky year-round; other constellations appear for only part of the year. Explain why this happens. Please help this is my last question and it truly stumped! It'd mean the world if someone could explain this to me. ...
Thursday, February 4, 2016 by anon
His,math lit,geo,life science,l.o an other two language
Five ways the similarities and differences between nsfas and student loan
Thursday, February 4, 2016 by Trompies
calculate numerical value of current in inductor resistant circuit. l=1mH r=3k (ist=1ma at t=0) i1(t=1us)in ma. i0=1ma my work. i=i0(1-e^-(t/T)) 1*10^-3(1-e^(-1/0.33) i=0.952ma this is wrong do I need to add initial current to this(1ma). why is this wrong??
Thursday, February 4, 2016 by bearinthewoods
6. About 90% of all marine organisms live in the upper 180 m of the ocean. How does temperature and light intensity influence this fact? (What does temperature and light intensity have to do with where ocean life is located?)
Thursday, February 4, 2016 by Debbie
Which statement best explains why tropical climates are so hot. They receive little rain. They receive more direct sunlight than other regions. (MY ANSWER) They lack vegetation. There are more hours of sunlight in tropical areas than other regions.
Thursday, February 4, 2016 by LOVE
The dissociation constant of ethanoic acid (ch3cooh) at 298k is 1.8*10^-5 in a buffer solution the concentration of ch3coo and ch3cooh are 0.05m and 0.1m respectively what is the ph of the buffer solution
Thursday, February 4, 2016 by abiola
1. How does a mutation in the DNA affect the way proteins are made? A) a mutation in the DNA results in miss happen tRNA molecules ** B) a mutation in the DNA results in a chance in the mRNA, but it does affect the protein C) a mutation in the DNA affects the structure of mRNA...
Wednesday, February 3, 2016 by Anonymous
What is the magnitude of average force a pole vaulters exterts on a landing bag if it's 1.5 meters high and deforms by 0.5 M=60kg Height of the bar=4.5m His centre of mass is 1m
Wednesday, February 3, 2016 by Physics help on problem
The science club sold 24 T-shirts last week and 18 T-shirts this week. What is the percentage of decrease in the number of T-shirts sold? A: 33% B: 25% C: 50% D: 75% How do you do this?
Wednesday, February 3, 2016 by Grant
1. In plants, sexual reproduction occurs when sperm and egg unite to form a... a. gamete b. gametophyte c. sporophyte d. zygote Is it d? 2. A plant continues to grow throughout its life through the use of s a process called... a. alternation of generations b. photosynthesis c...
Wednesday, February 3, 2016 by jjiiddss
1.Some people believe that certain drugs such as marijuana should be legalized. Do you agree or disagree? What impact might legalization have on forensic science as a field? for the first one I think that marijuana should not be legalized because people can mistreat the drug. ...
Wednesday, February 3, 2016 by anonymas
a car moves with a speed of 30km/h for 10 minutes and then 50km/h for 20 minutes.what will be the total distance covered by the car for 30 minutes?
Wednesday, February 3, 2016 by aastha
1) Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means. B. both substances have a set ratio of atoms that can be separated by physical means. C. both ...
Tuesday, February 2, 2016 by EEE
Two forces of 5n and 12n respectively act on the same piun.Show how you would determine the magnitude of the resultant by using the tail to head and tail to tail method and Pythagoras theorem(13n)
Tuesday, February 2, 2016 by Lerato
1. A ___ has a definite shape and a definite volume. (1 point) solid liquid gas molecule 2. Why is a gas able to flow? (1 point) Its particles have melted and can move around. Its particles have high viscosity and can move around. Its particles have enough energy ...
Tuesday, February 2, 2016 by Vanessa
A boy is standing at the top of the a building, 40 m high. He leans over the side and throws a pebble vertically upwards from the edge of the building at 12m.s^-1. The pebble reaches the ground at the foot of the building. Calculate time for the pebble to reach the ground
Tuesday, February 2, 2016 by Itumeleng
1. what is the momentum of a 20.0 kg scooter traveling at 5.00 m/s? 4.00 kg m/s 20.0 kg m/s 25.0 kg m/s 100 kg m/s 2. Which of the following describes the relationships between friction and inertia? when there is more friction, there is less inertia when there is less friction...
Tuesday, February 2, 2016 by Help Please
A force of 20N act an object angle of 30 to the inclined plane . The object move 8.0m up the unclined plane what is the workdone by the force plz draw.
Tuesday, February 2, 2016 by Ibn isah pd.
the active ingredient in the alergy medication claritin contain carbon,hydrogen,chloride,nitrogen,and oxygen its molecules formula is C22H23ClN2O2.the standard adult gosage utizies 1.572*10^19 molecules of the spicies determine the mass gosage of the active ingridient in the ...
Tuesday, February 2, 2016 by Kriatian ferrer
A flatt horizontal road is been designed for 60km/hr speed limit if the maximun acceleration of the car travelling on the road is to be 15m/s at the above speed limit.what is the minimun radius of the curvature of the curve on the road
Tuesday, February 2, 2016 by Paul
The equilibrium constant for the gas phase reaction N2O4 ⇀↽ 2 NO2 at a certain temperature is K = 0.0466. If the initial concentrations are [N2O4] = 1.0 M, [NO2] = 0.0 M, what are the final concentrations of [N2O4] and [NO2], respectively? 1. 1.0 M ; 0.22 M 2. 0.8 ...
Monday, February 1, 2016 by cora
How do you think a scientist might figure out a persons identity from bones? My answer I think that depending on the shape and size of the bones are different for every person like you DNA. This is how they know who you are. it is also possible that your bones carry DNA ...
Monday, February 1, 2016 by Anonymous
A body of mass 8kg moving with a velocity of 10m/s collides with another body of mass 6kg moving in the opposite direction with a velocity of 50m/s.determine their common velocity in the direction of A after collision
Monday, February 1, 2016 by Yunus
1. Calculate the theoretical density of Barium metal barium 2. Calculate the theoretical densities and packing factor of barium zirconate (BaZrO3), and barium cerate (BaCeO3), both of which form the perovskite structure
Monday, February 1, 2016 by MANFRED
A golfer on a level fairway hits a ball at an angle of 38° to the horizontal that travels 85 yd before striking the ground. He then hits another ball from the same spot with the same speed, but at a different angle. This ball also travels 85 yd. At what angle was the ...
Monday, February 1, 2016 by Brian
If exponential growth occurs in the population of a species of predator, the population of its prey will most likely decrease quickly. increase slowly. stay the same. experience exponential growth.
Monday, February 1, 2016 by sarah
a bullet is fired vertically upwards wth a initial velocity of 300m/s as it leaves the barrel.the rifle barrel is level with the ground and the rifleman stands in a trench.calculate the velocity of the bullet when it is 200m from ground level during the downward movement.
Monday, February 1, 2016 by nare
Plz correct me if I'm wrong!! 1) Which of the following is a chemical change? (1 point) Boiling of water Melting a cube of ice Dissolving 10 grams of salt in water Splitting water into hydrogen and oxygen*** 2) What is the mass of water that results from combining 2.0g of ...
Monday, February 1, 2016 by Vanessa
if more sugar is placed into a glass of iced tea than can dissolve in the te,the additional sugar will sink to the bottom of the iced tea. Which of the following statements best accounts for the observation that an oversupply of sugar crystals will collect on the bottom of the...
Sunday, January 31, 2016 by Flora
The global ocean covers about 70% of the Earths surface. If all the ocean water was uniformly distributed over the whole surface, what would be its depth? Assume that the Earth is a perfect sphere, and the average ocean depth is 4 km.
Sunday, January 31, 2016 by Marisa
SCIENCE HELP PLS
Which of the following is a source of graywater? Sewage water Shower water Water waste from an auto repair garage Water waste from a chemical company is it b
Sunday, January 31, 2016 by Oscar
-Explain how and when the universe formed according to the big bang theory? -Explain how and when our solar system formed? -Describe one observation astronomers use to show that the universe is Expanding?
Sunday, January 31, 2016 by Sarah
1. The liquid part of the blood is called _____. (1 point) hemoglobin plasma platelets white blood cells 2. Your circulatory system can best be compared to _____. (1 point) gates a net pipes a balloon 3. Which of the following shows the correct order of blood flow? (1 point) ...
Sunday, January 31, 2016 by Anonymous
Which of the following describes Joseph Listers role in discovery and prevention of disease? (1 point) recognized the relationship between disease and cleanliness discovered that microorganisms cause disease in humans invented pasteurization developed a series of methods...
Sunday, January 31, 2016 by Anonymous
A MACHINE OF EFFICIENCY 60% IS USED TO RAISE A LOAD OF 150kg THROUGH A VERTICAL DISTANCE OF 2.5m.CALCULATE THE WORK DONE [IN JOULES]. I tried E=WORK OUTUT/WORK INPUT times 100% 60=150 times 10 times 2.5/work input times 100 60 times work input=3750 times 100 work input=375000/...
Sunday, January 31, 2016 by JOY
An artificial satellite circles around the earth at the height where the gravitational force is one fourth of that at earth's surface. If the earth's radius is R the height of the satellite above the surface of the earth is?
Sunday, January 31, 2016 by Shubham
Ionic bonds: a. result from the sharing of electrons between atoms. b. form only between polar molecules. c. form between atoms that develop opposite charges. d. result from the natural repulsion that develops between protons. answer is C
Saturday, January 30, 2016 by mandy
As a result of rigorous experimentation Question 7 options: more hypotheses may be developed. more questions may be asked. a new biological concept could emerge. entire theories may be modified or discarded. all of these i suppose
Saturday, January 30, 2016 by mandy
Consider the researcher's experiments on the mysterious die-offs of fish in North Carolina rivers. Which of the following best represents her main hypothesis? Question 8 options: Fish maintained in laboratory environments were dying when exposed to river water. Microscopic...
Saturday, January 30, 2016 by Seth