What is the kinetic energy of the skier at a height of 60 meters above ground? (3 points)a.20,000 units, because total energy remains unchanged
b. 80,000 units, because total energy remains unchanged
c. 20,000 units, because total energy of the skier decreases
d. 80,000 units, because total energy of the skier decreases
Answers
Answer:
30,000 units, because total energy remains unchanged.
Step-by-step explanation:
The law of conservation of energy states that energy cannot be destroyed, it remains conserved but transforms from one form to the other form.
Hence, we can say that
Total energy = kinetic energy (KE) + potential energy (PE).
At 100 meters above
Total energy = 0 + 50000 = 50000 units.
Hence, 60 meters, total energy would be
20,000 + x = 50000 units
Finally,
x = 50,000 - 20,000
= 30,000
The energy will only transform from one form to the other but will not change.
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Answers
Answer:
207.50°C
Explanation:
Mass of metal (M1) = 440g
Volume of water = 400mL
Initial temperature of water (T2) = 20°C
Final temperature of the mixture (T3) = 35.80°C
Specific heat capacity of the metal (C1) = 0.3850J/g°C
Specific heat capacity of water = 4.184J/g°C
Density of water = 1g/mL
Temperature of metal (T1) = ?
Heat lost by the metal = Heat gained by the water
Q = MC∇T
Q = heat energy
M = Mass
C = specific heat capacity
∇T = change in temperature
M1C1(T1 - T3) = M2C2(T3 - T2)
M2 = ?
Density = mass / volume
Mass = density * volume
Mass = 1g/mL * 400mL
Mass = 400g
M1C1(T1 - T3) = M2C2(T3 - T2)
400 * 0.3850 (T1 - 35.80) = 400 * 4.184 * (35.80 - 20)
154(T1 - 35.80) = 1673.6 * (15.8)
154T1 - 5513.2 = 26442.88
154T1 = 26442.88 + 5513.2
154T1 = 31956.08
T1 = 31956.08 / 154
T1 = 207.50
The initial temperature of the metal was 207.50°C
Answers
Answer:
Explanation:
Givens
P = 1.25 atm
V = 5.4 L
P1 = 3 atm
V1 = ??
Formula
The basic formula is P*V = P1 * V1
Solution
1.25 * 5.4 = 3 * V1
6.75 = 3*V1
6.75 /3 = 3*V1/3
2.25 = V1
Answers
Following are the list of inert gases, along with their application:
Helium:Used as component of breathing gases due to its poor solubility in fluids or lipids. Helium is used in low temperature cryogenics.
Neon: Neon finds widespread applications in daily life such as lights, fog lights, TV cine-scopes, lasers, luminous warnings etc.
Argon: Argon is used in electrical components to provide a protective heat transfer medium for semiconductors. Argon is also capable to fill fluorescent and incandescent light bulbs. It assist in providing blue light.
Krypton: Krypton are usually mixed with a halogen to produce excimer lasers
Xenon: It is possible to generate X-rays from Xe. When Xe mixed with oxygen, it has to capability to enhance the contrast in CT imaging.
Radon: Radon is a radioactive element, which is used for radiotherapy and relief from arthritis.
Noble gases/inert gases are used in various fields including lamp fillers, metal welding or coolers
Further explanation
Noble gas (group 8A in the periodic system the element) is an element that is not reactive (stable)/inert
Its stability is caused by:
- 1. ns² np⁶ electron configuration (except He: 1s2), electrons in the subshell are already paired, making it difficult to form bonds with other elements
- 2. High ionization energy making it difficult to form positive ions (ionic compounds)
- 3. Low electron affinity that makes it difficult to bind electrons to become negative ions
Some noble gases such as Ar, Kr are obtained from multilevel distillation
The use of noble gases include:
- 1. Helium: filler of a gas balloon, mix with oxygen in a diver's tube, coolant
- 2. Neon: filler lights in red, can penetrate the fog
- 3. Argon: metal welding
- 4. Krypton and Xenon: colorful lights
Learn more
the periodic table
electron affinity
ionic compounds:Al₂X₃, XCO₃
Keywords : inert gas, application,electron configuration
Answers
B)Each Oxygen shares 2 electrons with the other
C)Each Oxygen shares 8 electrons with the other
D)Each Oxygen shares 1 electrons with the other
Answers
Answers
Answer:
The middle, or the transitional metals
Explanation:
When naming elements, we use roman numerals to indicate what their charge is. The charge of an element is affected by their number of valence electrons (outermost electrons).
Transitional metals are generally multivalent, meaning that element has more than one possible number of valence electrons. This makes them have more than one possible charge. Roman numerals indicate which charge of that element is used/discussed.