Potential and kinetic energy 1. An apple falling from a tree
2. A stationary ball on the ground
3. A sleeping dog
4. A boy running across the street
5. A car traveling on the road
6. A stretched rubber band
7. A basketball being thrown
8. A girl biking at the park
9. A leaf lying on the ground
10. A planet revolving around a star

Answers

Answer 1

Answer: Here's how potential and kinetic energy relate to the scenarios you've mentioned:

1. An apple falling from a tree: Kinetic energy increases as it falls, while potential energy decreases.

2. A stationary ball on the ground: No kinetic energy (it's not moving), but it has potential energy due to its position above the ground.

3. A sleeping dog: The dog has potential energy due to its position above the ground, but it's not in motion, so there's no significant kinetic energy.

4. A boy running across the street: The boy has both kinetic and potential energy. His motion represents kinetic energy, and his position above the ground while running represents potential energy.

5. A car traveling on the road: The car has both kinetic energy (due to its motion) and potential energy (due to its position above the road).

6. A stretched rubber band: The stretched rubber band has potential energy stored in its stretched configuration.

7. A basketball being thrown: The basketball has both kinetic energy (while it's in motion) and potential energy (when it's at the highest point of its trajectory).

8. A girl biking at the park: Similar to the boy running, the girl on the bike has both kinetic and potential energy.

9. A leaf lying on the ground: The leaf has potential energy due to its position above the ground, but it has little to no kinetic energy unless it's moving in the wind.

10. A planet revolving around a star: The planet has both kinetic energy (due to its orbital motion) and potential energy (related to its position within the gravitational field of the star).

In general, potential energy is associated with an object's position or state, while kinetic energy is associated with its motion.

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How does a controlled experiment work?

Answers

A controlled experiment works when an observer tests a hypothesis by looking for changes brought on by alterations to a variable.

A 2.9-kg cart is rolling along a frictionless, horizontal track towards a 1.4-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts collide, the first cart's velocity is +3.9 m/s, and the second cart's velocity is -1.2 m/s. (a) What is the total momentum of the system of the two carts at this instant? (b) What was the velocity of the first cart when the second cart was still at rest?

Answers

Answer:

9.63 kg m/s

3.32 m/s

Explanation:

$m_1$ = Mass of first cart = 2.9 kg

$m_2$ = Mass of second cart = 1.4 kg

$v_1$ = Velocity of first cart = 3.9 m/s

$v_2$ = Velocity of second cart = -1.2 m/s

Total momentum of the system

$p=m_1v_1+m_2v_2\n\Rightarrow p=2.9* 3.9+1.4* -1.2\n\Rightarrow p=9.63\ kg m/s$

The total momentum of the system is 9.63 kg m/s

Equating the same equation with $v_2=0$

$p=m_1v_1+m_2v_2\n\Rightarrow v_1=(P-m_2v_2)/(m_1)\n\Rightarrow v_1=(9.63-1.4* 0)/(2.9)\n\Rightarrow v_1=3.32\ m/s$

The velocity of the first cart when the second cart was still at rest is 3.32 m/s

Un herrero calienta un trozo de acero en un horno para poder forjarlo.A medida que aumenta la temperatura del metal ¿Que ocurre con su densidad?¿Aumenta o disminuye? Explica tu respuesta

Answers

La densidad del metal disminuye a medida que se calienta . Piense en el agua . Cuando hace frío , se convierte en hielo , lo cual es muy densa . Cuando hace calor , se evapora en gas , que no es denso.

Espero que esto no es confuso , yo no soy un hablante nativo de español .

Give two examples of workplace environments where considerations must be made with respect to the possibility of electric discharges. Explain why this is a necessary concern

Answers

Answer:

1.) Oil and gas environment

2.) Mechanical engineering and electrical environment.

Explanation:

1.) Oil and gas environment.

Electricity and electric discharge are recognized as serious workplace hazard in oil and gas companies, exposing employees to burns, fires, and explosions.

2.) Mechanical engineering and electrical environment.

Electricity or electric discharge has long been recognized as a serious workplace hazard, exposing employees to electric shock, electrocution, burns, fires, and explosions. Workers could die from electrocutions at work. This is

accounting for on-the-job fatalities and what makes these more tragic is that most of these fatalities could have been easily avoided.

When a wave is acted upon by an external damping force what happens to the energy of the waveA-the energy of the wave decreases gradually
B-rhe energy of the wave increases gradually
C-there is no change in the energy of the wave
D-the propagation of the wave stops immediately

Answers

Answer:

A-the energy of the wave decreases gradually

Explanation:

when a wave is acted upon by an external damping force the energy of the wave decreases gradually.

The energy degrades into the form of heat which is considered to be of less value and use. The reason is because it disperses and spreads more widely.

So therefore it end up as heat with a little sound but that is close to none because that too disperses into heat i.e. decreased form of energy.

Answer:

Explanation:

PLATO

In a posteroanterior (pa) projection of the chest being used for cardiac evaluation, the heart measures 14.7 cm between its widest points. if the magnification factor is known to be 1.2, what is the actual diameter of the heart?

Answers

The actual diameter of the heart is 12.25 cm. Given : Heart measure = 14.7 cm Magnification factor = 1.2

14.7 / 1.2 = 12.25

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