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grandymaker [24]
3 years ago
12

Which of the following choices defines energy in scientific terms?

Physics
2 answers:
snow_tiger [21]3 years ago
8 0
1) B. Energy is the ability to do work

2) C. Energy is conserved, it just goes from one form to another.

3) Work = Force x displacement
= 300 x 100 = 30,000 Joules

4) leaning a brick because no displacement is taking place.

5) They change the amount/strength or direction of the force needed.

6) Less force is needed and applied over a longer distance.

7) Heat is the flow of thermal energy from one object to another.
allsm [11]3 years ago
8 0

1. B. the ability to do work

In fact, energy is exactly defined as the ability to do work: for example, if the gravitational potential energy of an object is 100 J, it means that it can converts this energy into work done.

2. The form of energy changes, but the total energy remains the same

The law of conservation of energy states that the energy cannot be created nor destroyed, but only transformed into different forms: in this case, the electrical energy due to the current inside the circuit is converted into radiant energy, due to the light emitted by the lamp, but the total energy remains the same.

3. 30,000 J

The work done when the force of F=300 N pushes the box for a distance of d=100 m is given by the product between the two:

W=Fd=(300 N)(100 m)=30,000 J

4. leaning against a brick wall on the side of a building

This is not an example of work, because work is defined as the product between the force F and the displacement d:

W=Fd

however, in this case no displacement occurs, so d=0 and W=0.

5. They change the strength or direction of a force.

In fact, simple machines (like pulleys or levers) generally work by multiplying the input force, so that it is able to move/lift a much larger force.

6. Less force is applied over a longer distance.

By using levers, the force is applied over a longer distance. This means that a less force can be used: in fact, the momentum applied is given by

M=Fd

where F is the force applied and d is the distance of the force from the fulcrum: by increasing d, the distance, a less force F can be applied, keeping the same value of momentum M.

7. Heat is the flow of thermal energy from one object to another.

In fact, heat is related to how much thermal energy flows between two objects. Thermal energy, instead, refers to the amount of energy due to the random motion of the molecules inside an object, and it is proportional to the temperature of the object.

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A block of mass 4 kilograms is initially moving at 5m/s on a horizontal surface. There is friction between the block and the sur
emmasim [6.3K]

• Net vertical force on the block:

∑ <em>F</em> = <em>n</em> - <em>w</em> = 0

(<em>n</em> = magnitude of normal force, <em>w</em> = weight)

<em>n</em> = <em>w</em> = <em>m g</em>

(<em>m</em> = mass, <em>g</em> = 9.8 m/s²)

<em>n</em> = (4 kg) (9.8 m/s²) = 39.2 N

• Net horizontal force:

∑ <em>F</em> = -<em>f</em> = <em>m a</em>

(<em>f</em> = mag. of friction, <em>a</em> = acceleration)

We have <em>f</em> = <em>µ</em> <em>n</em> = 0.5 (39.2 N) = 19.6 N, so

-19.6 N = (4 kg) <em>a</em>

<em>a</em> = -4.9 m/s²

With this acceleration, the block comes to a rest from an initial speed of 5 m/s, so that it travels a distance ∆<em>x</em> in this time such that

0² - (5 m/s)² = 2 (-4.9 m/s²) ∆<em>x</em>

∆<em>x</em> = (25 m²/s²) / (9.8 m/s²) ≈ 2.55 m ≈ 2.6 m

8 0
3 years ago
The magnitude of electrical force between a pair of charged particles is ____ as much when the particles are moved half as far a
Gnesinka [82]

The magnitude of the electrical force between a pair of charged particles is 4 Times as much when the particles are moved half as far apart.

This can be easily understood by Columb's law,

F_{new} = \frac{kQ_{1}Q_{2}}{r^{2}}

which state's that the amount of electrical force experienced by two charged particles is inversely proportional to the square of the distance between them.

∴ \frac{F_{new} }{F_{old} } = \frac{Distance_{new}^{2}  }{Distance_{old}^{2}  }

Now, we know the new distance is half the original distance,

F_{new} = \frac{kQ_{1}Q_{2}}{\frac{r}{2}^{2} } \\F_{new} = 4\frac{kQ_{1}Q_{2}}{r^{2}}

F_{new} = 4F_{old}

The electrical force of attraction or electrostatic force of attraction between two charged particles refers to the amount of attractive or repulsive force that exists between the two charges. This can be calculated by Columb's Law.

A charged particle in physics is a particle that has an electric charge. It might be an ion, such as a molecule or atom having an excess or shortage of electrons in comparison to protons. The same charge is thought to be shared by an electron, a proton, or another primary particle.

Learn more about electrical force here

brainly.com/question/2526815

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8 0
1 year ago
A cat jumps off a piano that is 1.3m high. The initial velocity of the cat is 3m/s at an angle of 37degrees above the horizontal
SpyIntel [72]

Answer:

x=1.75m

Explanation:

From the exercise we have that

y_{o}=1.3m\\v_{o}=3m/s, \beta  =37\\

<em><u>To find how far from the edge of the piano does the cat strike the floor, we need to calculate its time first </u></em>

y=y_{o}+v_{oy}t+\frac{1}{2}gt^{2}

At the end of the motion y=0m

0=1.3+3sin(37)t-\frac{1}{2}(9.8)t^{2}

Solving for t

t=-0.36 s or t=0.73s

Since the <u>time</u> can't be negative the answer is t=0.73

Knowing that we can calculate how far does the cat strike the floor

x=v_{ox}t=3cos(37)(0.73)=1.75m

6 0
3 years ago
Help! 50 points each and brainliest!!!
klio [65]

Answer:

Your answer is the following...

(b)"Many valence electrons are shared between the atoms"

Explanation:

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hjlf
Periodic motion implies that the ride oscillates back and forth. The period is the time it takes to complete one cycle. Therefore it would be the swing.
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