PHYSICS HIGH SCHOOL

Calculate the annual potential energy contained in the water that is held back by the dam. Assume an average height of the water, h of 100.0 m. Express the answer in GJ (at least three significant figures).

Answers

Answer 1

Answer:

The potential energy can be given as

E = mgh. m is mass, g = acceleration due to gravity = 9.8m/s, h is the heigh, given as 100.0m

E = m x 9.8 x 100 = (980m)J

E = (980m)/10^9GJ = (0.000000980m)GJ to 3 significant figures

Explanation:

Hydroelectric dams exploit storage of gravitational potential energy. A mass, m, raised a height, h against gravity, g = 9.8 m/s², is given a potential energy E = mgh. The result will be in Joules if the input is expressed in meters, kilograms, and seconds (MKS, or SI units).

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A small object with mass m = 0.0900 kg moves along the +x-axis. The only force on the object is a conservative force that has the potential-energy function U(x)=−αx2+βx3, where α=2.00J/m2 and β=0.300J/m3. The object is released from rest at small x. When the object is at x = 4.00 m, what are its (a) speed and (b) acceleration (magnitude and direction)? (c) What is the maximum value of x reached by the object during its motion?

Regan has an empty glass cup. it has a mass of 0.3 kg. she drops the cup on the ground and it shatters into several pieces. if she collected all of the pieces of the cup, how much mass would all of the pieces have combined?

Answers

0.3, because its the same thing, just in pieces.

10 pointsTrue or False? Charging by friction happens when you rub two objects
together and PROTONS move from one object to the other.

Answers

Answer:

true

Explanation:

yes because I said so

If you mix 40.0 ml of a 0.200 m solution of k2cro4 with an aqueous solution of agno3, what mass of solid forms? (hint: most chromates are insoluble.)

Answers

The mass of solid formed is 2.654 g

calculation

step 1: write the balanced molecular equation

=2AgNO3(aq) + k2CrO4(aq)→ Ag2CrO4(s) + 2 KNO3(aq)

step 2: calculate the moles of K2CrO4

moles = molarity x volume in liters

molarity = 0.200 M = 0.200 mol/L

volume = 40 .0 ml in liters = 40/1000 = 0.04 liters

moles is = 0.200 mol/l x0.04 L =0.008 moles

Step 3: use the mole ratio to determine the moles of solid formed( Ag2CrO4)

K2CrO4 :Ag2CrO4 is 1:1 therefore the moles of Ag2CrO4 is also

0.008 moles

step 4: calculate the mass of Ag2CrO4

mass = moles x molar mass

from periodic table the molar mass of Ag2Cro4

=(107.87 x2) + 52 +(16 x4) =331.74 g/mol

mass = 0.008 moles x 331.74 = 2.654 g

Why should the lock and key be gay?

Answers

They shouldn't because it's lock and key

Answer:

.-.

Explanation:

What is the speed of an object at rest? a. 15 km/h b. 0 km/h c. 1 km/h d. This cannot be determined without further information.

Answers

b, an object at rest does not move

B. B. Bb b. Bb. Bb bb

___________is a highly reactive chemical species with one or more unpaired electrons

Answers

Explanation:

A specie with no charge and containing one or more number of unpaired electrons is known as a free radical.

These free radicals tend to attain stable configuration by gaining an electron from another atom. Hence, they fill their outer energy levels.

For example, a free radical of chlorine will readily combine with a hydrogen atom in order to attain stability and it leads to the formation of a new chemical bond between the hydrogen and chlorine atom.

As a result, it will form a hydrogen free radical.

Thus, we can conclude that free radical is a highly reactive chemical species with one or more unpaired electrons.

Final answer:

A free radical is a highly reactive chemical species with one or more unpaired electrons. They actively participate in chemical reactions due to their need to complete their electron shell. These radicals can be both harmful and beneficial, depending on their context.

Explanation:

A free radical is a highly reactive chemical species with one or more unpaired electrons. These species are reactive because they seek to complete their electron shell by forming pairs, making them eager to engage in chemical reactions.

For instance, in combustion processes, free radicals like hydroxyl (OH) play a crucial role. Despite their reputation for causing damage in biological systems, free radicals are also beneficial as they are used by the immune system to neutralize pathogens.

Learn more about Free Radicals here:

brainly.com/question/34681981

#SPJ3

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