A living thing is called?
Answers
Related Questions
Is carbon dioxide a polar or non-polar molecule?
Imagin you are walking along the roadway and see a syncline what can you conclude about the formation of that fold
30 Points 4 correct answer!!! ^u^This chart lists information from the periodic table about several elements.Which answer correctly fills in the blanks?A. Lithium has an atomic number of 3; boron has 5 electrons; oxygen has 8 neutrons; neon has an atomic mass of 20.B. Lithium has an atomic number of 4; boron has 6 electrons; oxygen has 8 neutrons; neon has an atomic mass of 20.C. Lithium has an atomic number of 7; boron has 11 electrons; oxygen has 16 neutrons; neon has an atomic mass of 10. D. Lithium has an atomic number of 73; boron has 5 electrons; oxygen has 8 neutrons; neon has an atomic mass of 30.
Plants are made of_________________cells, which have membrain-bound_____.
Answers
-- Take the lid off of the jar.
-- Wave the jar around for a while.
-- Put the lid back on the jar, tightly.
You now have a jar full of air and everything in the air.
You can take it into your laboratory and have your way with it.
Answers
Explanation :
It is given that,
Area of the container,
Load carried by piston, m = 350 kg
Pressure on the upper surface of the liquid is defined as the force acting per unit area.
Mathematically it can be written as :
From Newton's second law of motion :
F = m a
So,
P = 3430 Pa ( Pa = pascal)
or
P = 3.43 kPa
So, the correct option is (D)
Hence, this is the required solution.
Answers
Whenever the motion (speed or direction) of an object changes, we say that acceleration has occurred. From Newton's First Law of Motion, we know that force has been applied to the object.
E. If you knew the pressure, volume, and temperature of the helium in the balloon, what equation would you use to determine its number of moles? (2 points)
F. Your friend's mom has a great new car. What type of device does it use to move? Describe how this device operates, in terms of the second law of thermodynamics. (3 points)
G. The heat is getting to your friend. You start to share your iced drink with her, but the ice has disappeared! What phase change did the ice cubes undergo? What happened to the ice's molecules during this phase change? If the drink continued to heat, what would be its next phase change? (3 points)
H. Did the entropy of the ice cubes increase or decrease over time? Explain your answer, including a definition of entropy. (3 points)
6.A. The following is a nuclear equation for which type of decay process? (1 point)
235 92 U --> 4 2 He + 231 90 Th
B. Describe this type of decay process. What are the other two types of decay? How are the types of decay different? (4 points)
C. What is the name for the length of time of a decay process? How can this be used to calculate the amount of a radioactive element, compared to its original amount? (4 points)
7.A. Describe Einstein's famous equation, E = mc2, using two well-known conservation laws. Give an example of when you would use this equation. (4 points)
B. Describe fission and fusion. Explain how Einstein's equation relates to the concepts of fission and fusion. (5 points)
8. Describe an alternative energy source that involves the earth. (2 points)
Answers
where p is the gas pressure, V is the gas volume, n is the number of moles, R is the gas constant and T the gas temperature. Since we know p,V and T of the gas, we can find the number of moles n by re-arranging the equation:
F) The car uses an internal combustion engine. In an internal combustion engine, the fuel (gasoline) burns releasing heat, which moves the pistons of the engine. The motion of the pistons is then converted into motion of the wheels of the car.
The second law of thermodynamics states that the entropy of an isolated system can never decrease. If we take the engine as an isolated system, the this law applied also to it. In fact, at the beginning the engine containes fuel, which has a certain degree of "order" (entropy). When the fuel burns, the chemical bonds of the fuel are converted into heat, which has a higher degree of "disorder" (=more entropy) than the initial state.
G1) The ice cubes in the drink undergo melting: they go from solid state into liquid state (water).
G2) Since the temperature of the ice cubes is lower than the temperature of the surrounding liquid drink, the drink releases heat to the ice cubes. This heat makes the molecules of the ice cubes to vibrate faster and faster, eventually breaking the bonds between the molecules. When this occurs, the ice cubes start melting.
G3) If the drink continues to heat, it will undergo evaporation, which is the transition between the liquid state and the gas state. This transition occurs when the energy given to the molecules of the drink is large enough to remove the intermolecular forces between the molecules of the liquid, allowing them to escape from each other.
H) Entropy is the amount of thermal energy of a system (per unit temperature) which cannot be used to do work. In practise, the entropy of a system gives a measure of the degree of "disorder" of a system. When the ice cubes melt, the entropy of the system (the ice cubes) increases, because they move from a state with higher degree of "order" (the solid state) to a state with lower degree of "order" (the liquid state).
A) This nuclear equation is an example of alpha-decay, where an unstable nucleus (uranium-235) decays into a daughter nucleus (thorum-231) releasing an alpha particle (a nucleum of helium, consisting of 2 protons and 2 neutrons).
B) The other three types of decay are:
- beta minus decay: in an unstable nucleus, a neutron decays into a proton, releasing a fast moving electron and an antineutrino. Following this decay, the atomic number of the nucleus increases by 1 unit while its mass number remains the same
- beta plus decay: in an unstable nucleus, a proton decays into a neutron, releasing a fast moving positron and a neutrino. Following this decay, the atomic number of the nucleus decreases by 1 unit while its mass number remains the same
- gamma decay: a nucleus in excited states decays to its ground state by emitting a gamma photon, whose energy is equal to the difference in energy between the two nuclear levels.
C) The length of time of a decay process is usually expressed by using the concept of half life. The half life of a substance is the time it takes for the substance to decrease to half of its original amount. The equation that gives the amount left of a substance at time t is given by:
where m0 is the original mass of the substance,and
7B1) In nuclear fusion, two smaller nuclei combine together (fuse) to form a new larger nucleus. An example of this process is the hydrogen-to-helium fusion, which occurs inside the stars, where two nuclei of hydrogen (one proton each) fuse together to form a nucleus of helium-4. In the nuclear fusion process, the sum of the masses of the initial nuclei is larger than the mass of the final nucleus, so the mass lost in the process has converted into energy, according to Einstein's formula:
7B2) In nuclear fission, a nucleus of a heavy element absorbs a slow moving neutron, becoming unstable and decaying into smaller nuclei. An example of this process is the fission of uranium-235, which occurs inside nuclear power plants on Earth. In the process, uranium-235 decays into lighter nuclei and many neutrons, which are used to further induce other fission reactions with other nuclei of uranium-235. In the nuclear fission, the mass of the initial nucleus is greater than the masses of the final products, so the mass lost in the process has been converted into energy according to Einstein's formula:
8) An alternative energy source that involves the Earth is wind power: the air flows through turbines, which are put in motion by the wind. The motion of the turbines is then converted into electrical energy.
Answers
Answer:
2.5 m/s
Explanation:
Mechanical energy is the sum of the potential and kinetic energy.
E = PE + KE
E = mgh + ½mv²
172.1 J = (7.26 kg) (9.8 m/s²) (2.1 m) + ½ (7.26 kg) v²
v = 2.5 m/s
Answer:
2.5 m/s
Explanation: i jus did this on edg. its right:)