• ### How do you actually work out this maths problem? If 3/5 of a number is 81, what would 4/9 be?

Mathematics · 6 mins ago
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• ### Calorimetry: I have two substances, their masses, their initial temps, their specific heats, and the deltarH° of the reaction. Final temp?

I would like a formula, please. By the way, what does deltarH° mean? Is it "change of the heat of the reaction," or is it just "the heat of the reaction"?
Chemistry · 12 mins ago
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• ### Determine algebraically where the cubic polynomial function with zeroes 2, 3, -5 passes through point (4, 36) has value of 120?

Mathematics · 19 mins ago
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• ### A 30.5 g sample of a compound contains 9.29 g of nitrogen and the rest is oxygen. What is the empirical formula of the compound?

Chemistry · 22 mins ago
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• ### Sp ht of AL=0.9 J/g/degC. Box is 20g. So, 0.9x20=18J for 1 deg.raise. For 16 deg its 288J or .08 W-h. Time to do this with 25W? 2hrs? hdacke?

Geography · 23 mins ago
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Heat addition increases both kinetic energy and potential energy within a body. True or false? Thanks!
Chemistry · 25 mins ago
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• ### If an objects mass increases, then its gravitational pull _______? stays the same. increases or decreases?

Physics · 33 mins ago
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• ### A particle's initial velocity is −24.0 m/s. Its final velocity, 3.08 seconds later, is −14.0 m/s. What was its average acceleration?

Physics · 33 mins ago
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• ### Physics acceleration problem?

The speed limit on a particular freeway is 28.0 m/s (about 101 km/hour). A car that is merging onto the freeway is capable of accelerating at 4.75 m/s2. If the car is currently traveling forward at 13.0 m/s, what is the shortest amount of time it could take the vehicle to reach the speed limit?
Physics · 37 mins ago
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• ### Regarding the Lithosphere, what things in the lithosphere are necessary for a sustainable biosphere. (Relate to Biosphere 2)?

Earth Sciences & Geology · 41 mins ago
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• ### DONT AWNSER THIS QUESTION?

Mathematics · 41 mins ago
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• ### Describe how a chemical reaction that “goes to completion" relates to the idea of limiting reactants?

Chemistry · 43 mins ago
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• ### BIO 20 HELP?

As you may remember from previous science courses, the Sun's incoming solar radiation is stronger at the equator than at the Earth's poles. What effect might this have on ecosystems at the equator and in the northern hemisphere? a. The total energy in the ecosystem at the equator will be higher due to more incoming radiation and more... show more
Biology · 47 mins ago
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• ### Motion Average Velocity?

In 1271, Marco Polo departed Venice and traveled to Kublai Khan's court near Beijing, approximately 7900 km away in a direction we will call positive. Assume that the Earth is flat (as some did at the time) and that the trip took him 4.0 years, with 365 days in a year. (a) What was his average velocity for the trip, in meters per second? (b) A... show more
Physics · 48 mins ago
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• ### Someone Help me on this chemistry problem please?

Chemistry · 49 mins ago
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• ### General chemistry problem?

Chemistry · 51 mins ago
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• ### Can someone help me with this chemistry problem please. I'll award you best answer asap?

Chemistry · 51 mins ago
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• ### Help with maths?

Mathematics · 53 mins ago
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