Answer:

**Answer:**

60 %

**Explanation:**

Efficiency is defined as the ratio of output power to the input power.

Input energy each hour = 9 x 10^12 J

Output energy each hour = 5.4 x 10^12 J

Efficiency = Output energy per hour / input energy per hour

Efficiency = (5.4 x 10^12) / ( 9 x 10^12) = 5.4 / 9 = 0.6

Efficiency in percentage form = 0.6 x 100 = 60 %

Answer:
### Final answer:

### Explanation:

### Learn more about Thermal Efficiency here:

The efficiency of a heat engine is calculated using the formula (Energy Input - Energy Output) / Energy Input. Given the figures, the **efficiency of the engine** is 40%, indicating that 40% of the input energy is converted into work.

The **efficiency** of a heat engine is determined by the ratio of work output to **energy input. I**n the given scenario, the turbine in an electric power plant is supplied with 9.0 x 10^12 joules of energy, and 5.4 x 10^12 joules of energy is expelled as heat per hour. We can calculate the efficiency using the equation:

Efficiency = (Energy Input - Energy Output) / Energy Input

By substituting the given values, Efficiency = (9.0 x 10^12 J - 5.4 x 10^12 J) / 9.0 x 10^12 J = 0.4 or 40%

This means the **heat engine** of the power plant has a 40% efficiency, meaning 40% of the energy input is converted into work while 60% is discarded as waste heat.

#SPJ3

Two cylinders with the same mass density rhoC = 713 kg / m3 are floating in a container of water (with mass density rhoW = 1025 kg / m3). Cylinder #1 has a length of L1 = 20 cm and radius r1 = 5 cm. Cylinder #2 has a length of L2 = 10 cm and radius r2 = 10 cm. If h1 and h2 are the heights that these cylinders stick out above the water, what is the ratio of the height of Cylinder #2 above the water to the height of Cylinder #1 above the water (h2 / h1)? h2 / h1 =

Alex throws a 0.15-kg rubber ball down onto the floor. The ball’s speed just before impact is 6.5 m/s, and just after is 3.5 m/s. If the ball is in contact with the floor for 0.025 s, what is the magnitude of the average force applied by the floor on the ball?

Which if, any, of these statements are true? (More than one may be true.) Assume the batteries are ideal. Check all that apply. A battery supplies the energy to a circuit. A battery is a source of potential difference; the potential difference between the terminals of the battery is always the same. A battery is a source of current; the current leaving the battery is always the same.

In the study of sound, one version of the law of tensions is:f1= f2 √ (F1/F2)If f1= 300, F2= 60, and f2=260, find f1 to the nearest unit.

What is the potential energy of a spring that is compressed 0.65 m by a 25 kg block if the spring constant is 95 N/m?A. 1.6JB. 7.9JC. 15JD. 20J

Alex throws a 0.15-kg rubber ball down onto the floor. The ball’s speed just before impact is 6.5 m/s, and just after is 3.5 m/s. If the ball is in contact with the floor for 0.025 s, what is the magnitude of the average force applied by the floor on the ball?

Which if, any, of these statements are true? (More than one may be true.) Assume the batteries are ideal. Check all that apply. A battery supplies the energy to a circuit. A battery is a source of potential difference; the potential difference between the terminals of the battery is always the same. A battery is a source of current; the current leaving the battery is always the same.

In the study of sound, one version of the law of tensions is:f1= f2 √ (F1/F2)If f1= 300, F2= 60, and f2=260, find f1 to the nearest unit.

What is the potential energy of a spring that is compressed 0.65 m by a 25 kg block if the spring constant is 95 N/m?A. 1.6JB. 7.9JC. 15JD. 20J

The gravitational force minus any contact forces acting on an object

The difference between the normal force and the gravitational force acting on an object

The sum of all the forces acting on an object in the same direction

The **sum **of all forces acting on an object in the same direction is **described **for the net force **acting **on an object.

- When the
**forces**are acting in the same direction of movement of the object it can be said as sum of the two**individual**forces will be**equal**to the "**Net Force**" .

- The net force is the combined force of all
**individual**forces acting on an**object**. - If the object with the
**forces**in the opposite direction, then the net force will not be**equal**to the sum of the forces.

**Example **: If two **forces **(2 kids pushing in the same direction to move the object big box) act on an **object **(big box) in the same direction, then the **net **force is equal to the sum of the two **forces**. If the kids pushed in the **opposite **direction, the net force will not **occur**.

Hence, **Option D **is the correct answer.

Learn more about **Net force,**

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**Answer:**

The sum of all the forces acting on an object in the same direction.

**Answer:**

It will take **29.31 seconds** for the Boxster to catch the Scion

**Explanation:**

Given the data in the question;

lets say Toyota Scion xB is car A and Porsche Boxster convertible is B and Toyota Scion xB is car A

the distance travelled by car A is

x = × t

where is the speed of the car and t is time

the distance travelled by car B before reaching car A will be;

x + x₀ = × t

Now lets replace x by × t

so

( × t) + x₀ = × t

x₀ = ( × t) - ( × t)

x₀ = t ( - )

t = x₀ / ( - )

so we substitute

t = 170 m / (24.4 - 18.6)

t = 170 / 5.8

t = **29.31 s**

Therefore; it will take **29.31 s** for the Boxster to catch the Scion

**Answer:**

the new depth is 2.3 ft

**Explanation:**

the solution is in the attached Word file

**Answer:**

HSBC keen vs kg get it yyyyyuuy

**Explanation:**

hgccccxfcffgbbbbbbbbbbghhyhhhgdghcjyddhhyfdghhhfdgbxbbndgnncvbhcxgnjffccggshgdggjhddh

nnnbvvvvvggfxrugdfutdfjhyfggigftffghhjjhhjyhrdffddfvvvvvvvvvvvbbbbbbbbbvvcxccghhyhhhjjjhjnnnnnnnnnnnnnbhbfgjgfhhccccccvvjjfdbngxvncnccbnxcvbchvxxghfdgvvhhihbvhbbhhvxcgbbbcxzxvbjhcxvvbnnxvnn

**Answer:**

the answer is 3.3 %

**Explanation:**

**Answer:**

Part a)

Part b)

Yes it is the expected value of electric field at the surface of an atom

Part c)

**Explanation:**

Since negative charge of electrons in uniformly distributed in the atom while positive charge is concentrated at the nucleus

So the electric field due to positive charge of the nucleus is given as

now charge due to electrons inside a radius "r" is given as

now we will have electric field given as

now net electric field is given as

Part b)

At the surface of an atom

Yes it is the expected value of electric field at the surface of an atom

Part c)

If Z = 92

R = 0.10 nm

so we will have