PHYSICS HIGH SCHOOL

A 2,100 kg car is lifted by a pulley. If the cable breaks at 4.50 m, what is the velocity of the car when it hits the ground

Answers

Answer 1
Answer: The problem involves the conversion of potential energy to kinetic energy as the object falls from rest. Energy is conserved, so the equation used is:

PEi + KEi = PEf + KEf

Since the object is falling from rest, the initial kinetic energy is zero. Also, since the object hits the ground at its final position, the final potential energy is zero. This leaves:

PEi = KEf
mgh = 1/2 mv^2

*cancel out mass on both sides of the equation

gh = 0.5v^2
v = sqrt(2gh) = sqrt(2*9.81*4.5) = 9.40 m/s --> final ans.

Related Questions

A rock at the top of a 30 meter cliff has a mass of 25 kg. Calculate the rock’s gravitational potential energy when dropped off the cliff. Assuming that energy is conserved and there is no air friction and gravity is 9.8 m/sec., at the bottom of the cliff the rock’s potential energy is completely converted to kinetic energy. Use the formula for kinetic energy to calculate the rock’s speed at the bottom of the cliff. Show all calculations.
If the core of a supernova explosion contains three or more solar masses of matter, the core will most likely become a _____.
The circuit you should use to find the open-circuit voltage is
The wavelength of a given region of the electromagnetic spectrum ranges from 1 x 10-11 - 1 x 10-8 meters. Which waves are found in this region?A) gamma rays B) x-rays C) micro waves D) radio waves
A soccer ball is kicked horizontally. What is its average speed if its displacement is 55.0 m after 12.00 s? What formula was used to solve this problem?

Which type of bond will sulfer (S) and nitrogen (N) form?a. metallic bond
b. covalent bond
c. iconic bond

Answers

Answer:

In ionic compounds, electrons are transferred between atoms of different elements ... For example, two hydrogen atoms bond covalently to form an H2 molecule; each ... is released when one mole of H2 molecules forms from two moles of H atoms: ... atom in each pair is more electronegative: (a) N or P. (b) N or Ge. (c) S or F.

Explanation:

Which does not contain a lens?
A.a camera
B.an eye
C.a mirror
D.binoculars

Answers

A MIRROR does not contain a lens.

Answer:

C. A Mirror

Explanation:

Took the test <3

An ultrasound system can produce images of body structures because sound waves

Answers

travel at different speeds through materials of different densities.

1. Who first published the classification of the elements that is the basis of our periodic table today?2. By what property did Mendeleev arrange the elements?

3. By what property did Moseley suggest that the periodic table be arranged?

4. “The properties of the elements repeat periodically” defines the _____.

5. What is a period and how many are there in the periodic table?

6. What is a group (also called a family)? How many are there in the periodic table?

7. State the number of valence electrons in the following:

Element Valence Electrons
Magnesium
Phosphorous
Fluorine
Neon

8. Give the names and chemical symbols for the following:

Atomic Number Element Name Chemical Symbol
13
92
5
25

9. List, by number, both the period and group of each of these elements.

Element Symbol Period Group
Beryllium Be
Iron Fe
Lead Pb

10. Which of the following pairs of elements belong to the same period? Highlight
a. Na and Cl b. Na and Li c. Na and Cu d. Na and Ne

11. Which of the following pairs of elements belong to the same group? Highlight
a. H and He b. Li and Be c. C and Pb d. Ga and Ge

12. What group numbers are the transitions elements?

13. What are the group 1/IA elements called?

14. What are the group 2/IIA elements called?

15. What are the group 17/VIIA elements called?

16. What are the group 18/VIIIA elements called?

17. Which alkali metal belongs to the sixth period?

18. Which halogen belongs to the fourth period?

19. What element is in the fifth period and the eleventh group?

20. What is the heaviest noble gas?

21. What is the heaviest alkaline earth metal?

22. Would you expect strontium to be, chemically, more similar to calcium or rubidium and WHY?

23. List the three lightest noble gases.

24. List all of the alkali metals

Answers

That particular group of elements is reffered to as the "Noble Gasses"--a title that comes from the fact that these gases are very "secure" and don't mix well with other elements.

Final answer:

The first published classification of the periodic table is by Dmitri Mendeleev who arranged it by atomic mass, but it was later rearranged by Henry Moseley by atomic number. This forms the basis of the modern periodic table. Various chemistry concepts related to the periodic table such as groups, periods, valence electrons, and names of certain elements are also discussed.

Explanation:

The first published classification of elements which forms the basis of our periodic table today was by Dmitri Mendeleev. Mendeleev initially arranged the elements by their atomic mass, and he noticed that the properties of elements repeated periodically when arranged in this order. However, later on, Henry Moseley suggested that the periodic table be arranged by atomic number (the number of protons in an atom's nucleus), which is how the modern periodic table is ordered.

"The properties of the elements repeat periodically" defines the Periodic Law. A 'period' in the periodic table is a horizontal row and there are 7 periods. A 'group' or 'family' in the periodic table is a vertical column and there are 18 groups.

Magnesium has 2 valence electrons, Phosphorous has 5, Fluorine has 7, and Neon has 8. The elements with atomic numbers 13, 92, 5, and 25 are Aluminum (Al), Uranium (U), Boron (B), and Manganese (Mn) respectively.

Beryllium (Be) belongs to period 2 and group 2, Iron (Fe) is in period 4 and group 8, and Lead (Pb) is in period 6 and group 14. The two pairs of elements that belong to the same period are Na and Cl, and Na and Ne. The pairs that belong to the same group are H and He, and Ga and Ge.

The transition elements are in groups 3-12. The group 1/IA elements are called Alkali metals, the group 2/IIA elements are called Alkaline earth metals, the group 17/VIIA elements are called Halogens, and the group 18/VIIIA elements are called Noble gases. The alkali metal that belongs to the sixth period is Cesium, the halogen that belongs to the fourth period is Bromine, the element in the fifth period and the eleventh group is Silver. The heaviest noble gas is Radon and the heaviest alkaline earth metal is Radium. Strontium is chemically more similar to Calcium, as they are in the same group and have the same number of valence electrons. The three lightest noble gases are Helium, Neon, and Argon, and the alkali metals are Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium.

Learn more about Periodic Table here:

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Which one of the following statements about sulfuric acid is correct? A. Sulfuric acid is a known muriatic acid.
B. Sulfuric acid is a strong oxidizing agent.
C. Sulfuric acid is dangerous to living organisms.
D. Sulfuric acid has little effect on metals

Answers

The answer is C. Sulfuric Acid is dangerous to living organism

Direct contact with your skin and it will cause Chemical Burns , Direct contact with your eyes and it could cause a permanent Blindness.

This chemical also suck the water out of everything, so you can guess what will happen if it get into your body.

Select the correct answer. Rita is a registered dietician. What does her work entail? A. prescribing medication for clients B. cooking healthy meals for students C. demonstrating how to use gym equipment D. making recommendations for healthy eating habits

Answers

Answer:

D

Explanation:

The answer is D because:

A) Only doctors are allowed to prescribe medications.

B) Rita is not a chef/cook.

C) Rita is not a personal trainer

D) The job of a dietican is to provide reccomendations to their clients in order for them to implement a healthy lifestyle via consuming what is best for them.

Hope this helps :)

Answer:

D.) Making recommendations for healthy eating habits

Explanation: PLATO :)))
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