Question

PLS HELP!

1. Indicate the kind of energy represented in each example below:

a. Burning fuel in a car

b. Exploding an atomic bomb

c. Current moving in a wire

d. Tires sliding on pavement when brakes are applied

e. Football player running for a touchdown

2. All forms of energy except nuclear fission come from the ________________.
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1. Why does it take much longer for a car to stop when applying the brakes at a speed of 60 mph than at 50 mph?

2. All forms of energy can exist as either ________ or ________ energy.
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1. Calculate the G.P.E. in joules of a 675-newton climber at the top of a 3,050-meter mountain in Colorado.
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1. Name three examples of "concentrated" forms of energy.

Review

1. An example of electromagnetic energy would be:

a. A windmill.

b. A nuclear isotope like uranium.

c. An X-ray.

d. Coal.

2. When a match is struck, the chemical energy stored in the match's head is converted to _____________ and _____________ energy.

3. The Law of Conservation of Energy states that ____________________________ _

4. "You can't get more energy out of something than you put into it" is a statement of?

5. Sir Marvin decided to improve the destructive power of his cannon by increasing the size of his cannonballs. Sir Seymour kept his cannonballs the same size, but improved his powder to provide more velocity. Which knight will have the more destructive cannon? Why?

6. In terms of the laws of thermodynamics, explain why a refrigerator vents hot air.
2. Mars has a surface gravity that is only 0.38 (a little over one-third) that of Earth's. Thus, the weight of an object will also be 0.38 times that of Earth. What is the G.P.E. of a climber who weighs 675 newtons on Earth at the top of 26,000-meter Olympus Mons? _______

3. G.P.E. on Earth is determined by an object's _______and _______.
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1. When an automobile engine burns gasoline, what are the energy conversions? (Hint: there are three.)

2. A ball drops from a height, bounces three times, and then rolls to a stop when it reaches the ground the fourth time.

At what point is its potential energy greatest?

At what points does it have zero kinetic energy?

At what point did it have maximum kinetic energy?
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1. Think about a thermos bottle. It consists of an inner bottle with a shiny silver surface separated from an outer container by a space with no air. In what ways does it block conduction, convection, and radiation?

2. Where and how does most heat loss occur in a thermos bottle? _________
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1. Which law of thermodynamics relates most directly to the Law of Conservation of Energy?

Answer 1

listed below

Step-by-step explanation:

Indicate the kind of energy represented in each example below:

a. Burning fuel in a car - Chemical Energy (potential energy stored in the bonds of the fuel that is released as heat and kinetic energy when burned)

b. Exploding an atomic bomb - Nuclear Energy (energy released from the process of nuclear fission or fusion)

c. Current moving in a wire - Electrical Energy (movement of electrons in the wire)

d. Tires sliding on pavement when brakes are applied - Kinetic Energy (energy of motion)

e. Football player running for a touchdown - Kinetic Energy (energy of motion)

All forms of energy except nuclear fission come from the sun. (The sun is the ultimate source of energy for most processes on Earth, including fossil fuels which are derived from ancient solar energy stored in organic matter over millions of years.)

It takes much longer for a car to stop when applying the brakes at a speed of 60 mph than at 50 mph because the kinetic energy of the car is greater at 60 mph. The braking system needs to dissipate this higher amount of kinetic energy to bring the car to a stop, and this requires more time and distance.

All forms of energy can exist as either potential or kinetic energy.

To calculate the G.P.E. (Gravitational Potential Energy) in joules, we can use the formula: G.P.E. = m * g * h, where m is the mass in kilograms, g is the acceleration due to gravity (approximately 9.81 m/s² on Earth), and h is the height in meters.

Assuming the climber's mass is 675 N ÷ 9.81 m/s² ≈ 68.78 kg, and the height is 3050 meters:

G.P.E. = 68.78 kg * 9.81 m/s² * 3050 m ≈ 2,020,271 joules

Review

An example of electromagnetic energy would be:

c. An X-ray.

When a match is struck, the chemical energy stored in the match's head is converted to heat and light energy.

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed from one form to another.

"You can't get more energy out of something than you put into it" is a statement of the Law of Conservation of Energy.

Sir Marvin will have the more destructive cannon because the destructive power of a projectile is primarily determined by its kinetic energy, which depends on its mass and velocity. By increasing the size of his cannonballs, Sir Marvin is increasing the mass and hence the kinetic energy, making his cannon more destructive.

In terms of the laws of thermodynamics, a refrigerator vents hot air because it operates by transferring heat from the inside (cooling compartment) to the outside (surroundings). This heat transfer is done against the natural flow of heat (from a colder region to a warmer region), which requires the removal of heat (hot air) to the surroundings.

To calculate the G.P.E. on Mars, we can use the formula: G.P.E. = weight * gravity * height.

Weight on Mars = 675 N * 0.38 ≈ 256.5 N

G.P.E. = 256.5 N * 9.81 m/s² * 26000 m ≈ 6,635,857.5 joules

Gravitational Potential Energy (G.P.E.) on Earth is determined by an object's mass and height.

When an automobile engine burns gasoline, the energy conversions are:

a. Chemical energy in the gasoline is converted to heat energy and kinetic energy in the engine through combustion.

b. Kinetic energy in the engine is converted to mechanical energy to drive the car's wheels.

c. Some of the mechanical energy is converted back to heat energy due to friction and inefficiencies in the engine and drivetrain.

At what point is its potential energy greatest? The potential energy is greatest at the highest point where the ball is before it starts falling (e.g., the initial height).

At what points does it have zero kinetic energy? The ball has zero kinetic energy at the highest point (where it momentarily stops before falling) and at the bottommost points of each bounce when it changes direction.

At what point did it have maximum kinetic energy? The ball has maximum kinetic energy just before it reaches the ground after each bounce when it's moving at its maximum speed.

A thermos bottle blocks conduction and convection by having a vacuum between the inner and outer containers, which prevents the transfer of heat through these methods. Additionally, the shiny silver surface inside the thermos minimizes radiation by reflecting thermal radiation back into the thermos, reducing heat loss. Most heat loss occurs in a thermos bottle at the opening (cap) where heat can transfer through conduction and convection. The cap is usually not as well insulated as the rest of the thermos.

the law of thermodynamics that relates most directly to the Law of Conservation of Energy is the First Law of Thermodynamics, also known as the Law of Energy Conservation.