what is the efficiency of an engine that puts out 250 J of work for every 500 J of heat put into it?

Based on the data provided, the impulse of the floor on the ball is 59.4 Ns.

Using the equation of motion to determine the velocity at the end of the fall

Where v is velocity at the end of fall

u is initial velocity = 0

g is acceleration due to gravity = 9.81 m/s^2

h is height = 20

v^2 = 0 + 2 (9.81)(20)

v^2 = 392.4

v = - 19.8 m/s

The velocity, v after bouncing is calculated also:

u = 0

g = 9.81 m/s^2

h = 5.0 m

v^2 = 0 + 2(9.81)(5)

v^2 = 98.1

v = 9.904 m/s

Impulse = 2.0 × (9.9 -(-19.8)

Impulse = 59.4 Ns

Therefore, the impulse of the floor on the ball is 59.4 Ns.

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An example of a solid that sunlines is a billboard.

A billboard simply refers to a very large board which is usually, frequently and most of the time used for displaying advertisements

So therefore, an example of a solid that sunlines is a billboard

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The most widely accepted theory about the universe is the big bang theory.

The Big Bounce theory refers to the universe that is expanding and contracting, move back and forth in a big-picture timeline. The Big Bang theory was happened about 13.8 billion years ago when the universe began as a tiny, dense, ball that exploded. Many astronomers use the Big Bang theory to show how the universe began. But what caused this explosion in the first thing that is still a mystery. It has passed through many stages, which can be considered cosmological theories. The flat Earth, the geocentric model, heliocentricity, galactic centricity, the Big Bang, and the Inflationary Big Bang. In the Big Bounce theory, the universe is expanding and contracting, seesawing back and forth in a massively big-picture timeline more specific theory called "Big Bounce" theory proposes that the universe could collapse to the state where it is first started and then initiate another Big Bang.

So we can conclude that The Big Bang theory says that the universe came into being from a single more than 13 billion years ago.

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Answer :A testable prediction is also known as a hypothesis.

Explanation: I think

A testable prediction is a hypothesis. (a)

The scientist would look out for patterns and connections. Option D

We define data as a set of facts that we can obtain from a study. We know that scientists are always engages in some kind of study and the reason for the study is that they want to obtain the reasons for certain occurrence.

It is common that when we present a professional scientist with a data set, what first comes to mind is that we need to find the patterns that are in the data set as well as the connections.

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As a result, the arrows in the free-body diagram that indicate the forces operating on the object will be balanced, equal in magnitude, and pointing in the opposite direction.

Arrows used in free body diagrams to depict the various forces acting on an item. Force is a vector, as was previously stated. As a result, every force on a free body diagram has a value and a direction.

Newton's rule states that if the net force acting on an object is not zero, then the object's acceleration will also not be zero. Therefore, we will analyse the total force using the free body diagram.

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The mass of the other object is 2.25 kg.

Let the mass of the unknown object be denoted as m. Using the formula for center of mass, we can set up the equation: (1.50 kg)(0.4 m) = m(0.6 m). Solving for m, we get m = 2.25 kg. The problem can be solved using the equation for the center of mass of a two-object system. The distance of the center of mass from one of the objects can be used to find the mass of the other object. By setting up the equation and solving for the unknown mass, we get the value of 2.25 kg.

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Answer: Heyo Kenji Here! Here's your answer- A planet is most likely to have tectonic activity.

Explanation: Hope this helps!

Have a nice day!

- Kenji ^^

As a result, the tension inside the string will remain the same when the mass of the blocks is doubled and the force being applied remains constant.

Tension arises whenever there is apprehension, mistrust, and a potential for an unplanned act of violence or conflict. The likelihood that the confrontation between the two countries will continue is high. Conflict, hostility, unease, and antagonism are synonyms for this word. more phrasal verbs for tension.

Tension is the term used to describe the physical and mental stress that comes along with life's events. Stress can be caused by either happy or unhappy circumstances and can manifest as physical, mental, or emotional symptoms.

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Answer:

Maybe you're hanging out around the wrong crowd. The people you are probably choosing to be around are more quiet then you.

Explanation:

The critical angle for total internal reflection of the rays at the water/air interface is approximately 48.76°.

To calculate the critical angle for total internal reflection at the water/air interface, use Snell's law and the definition of the critical angle.

Snell's law relates the angles of incidence and refraction when light passes from one medium to another:

n₁ × sin(θ₁) = n₂ × sin(θ₂)

Where:

n₁ = refractive index of the first medium (water)

θ₁ = angle of incidence

n₂ = refractive index of the second medium (air)

θ₂ = angle of refraction

When light undergoes total internal reflection, it means that the angle of refraction becomes 90°. Therefore, sin(θ₂) will be equal to 1.

sin(θ₂) = 1

Using Snell's law, rewrite the equation as:

n₁ * sin(θ₁) = n₂

The critical angle (θc) is defined as the angle of incidence at which the angle of refraction is 90°. Therefore, write:

sin(θc) = n₂ / n₁

In this case, since considering the water/air interface, the refractive indices are:

n₁ (water) ≈ 1.33

n₂ (air) ≈ 1.00 (approximated as 1)

Substituting these values into the equation:

sin(θc) = 1 / 1.33

Now, find the value of sin(θc) and then calculate the critical angle θc using the inverse sine function (sin⁻¹):

θc = sin⁻¹(1 / 1.33)

θc = 48.76°.

Therefore, the critical angle for total internal reflection of the rays at the water/air interface is approximately 48.76°.

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A bowling ball has a mass of 7.0 kg, a moment of inertia of 2.8 ´ 10-2 kg×m2 and a radius of 0.10 m. If it rolls down the lane without slipping at a linear speed of 4.0 m/s, the  total kinetic energy of the bowling ball is 78.4 Joules.

Calculate the total kinetic energy by using this formula.
Total Kinetic Energy = (1/2) * (mass) * (velocity)^2 + (1/2) * (moment of inertia) * (angular velocity)^2
Since the bowling ball is rolling without slipping, we can relate its linear speed (v) to its angular speed (ω) using the formula:
v = ω * r
where r is the radius of the ball. Rearranging this equation, we get:
ω = v / r
Substituting the given values, we get:
ω = 4.0 m/s / 0.10 m = 40 rad/s
Now, we can substitute the values of mass, moment of inertia, velocity, and angular velocity in the formula for total kinetic energy:
Total Kinetic Energy = (1/2) * (7.0 kg) * (4.0 m/s)^2 + (1/2) * (2.8 × 10^-2 kg×m^2) * (40 rad/s)^2
Simplifying this expression, we get:
Total Kinetic Energy = 56 J + 22.4 J = 78.4 J
Therefore, the total kinetic energy of the bowling ball is 78.4 Joules.

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The density of the planet is \(2249.17 \frac{kg}{m^3}\)

Solution:

Given

Time period T = 1.57 hours = \(1.57 \times 60 \times 60 sec\)

using formula

T = \(\frac{2 \times \pi}{ \omega}\)

\(\omega = \frac{2 \pi} T\\\omega = \frac{2 \pi} {1.57 \times 60 \times 60 sec}\)

also, force \(F = \frac{GMm}{R^2}\)

meanwhile Force \(F = \frac{mv}{R^2}\\\)

equating both the above equations we get

we get \(v = \sqrt{\frac{GM}{R} }\)

also \(M = \frac {4\pi R^3 \rho} 3\)

also, \(\omega = \frac vR\)

then \(\frac{2 \pi} {1.57 \times 60 \times 60 sec} = \sqrt{\frac{G \frac {4\pi R^3 \rho} 3}{R} }\)

solving the equation we get

\(\rho = 2249.17 \frac{kg}{m^3}\)

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Answer:

A. amplitude

Explanation:

please vote me brainliest?? thanks:)

The law of conservation of energy tells us that the total energy of a system remains constant. Therefore, the potential energy at the top of the pendulum's swing (20 J) must be equal to the kinetic energy at the bottom of its swing.

We can use the formula for kinetic energy:
Kinetic energy = 1/2 * mass * velocity^2

Since the pendulum's mass is given as 0.8 kg, we just need to solve for the velocity at the bottom of its swing.
20 J = 1/2 * 0.8 kg * v^2

Solving for v, we get:

v = √(40/0.8)
v ≈ 8.94 m/s

Now that we know the velocity at the bottom of the pendulum's swing, we can calculate its kinetic energy:

Kinetic energy = 1/2 * 0.8 kg * (8.94 m/s)^2
Kinetic energy ≈ 32 J

Therefore, the kinetic energy at the bottom of the pendulum's swing is approximately 32 joules.

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Answer:

Q = I * t = 2 Coulomb / sec * 1000 sec = 2000 Coulombs transferred

E (energy) = V * Q = I * t * 240 V

E = 240 J / Coul * 2000 Coul = 480,000 Joules

Next question:

Total voltage drop in circuit = 6.5 V + 4.5 V = 11 V

So the power supply must supply 11 V

Answer:

D

Explanation:

the cart will continue to travel at constant velocity

The subsequent current in the series RLC circuit is given by the equation: i(t) = I * cos(5t - Φ), where I is the amplitude of the current and Φ is the phase angle.

To find the subsequent current, we need to calculate the amplitude (I) and the phase angle (Φ) of the current.

First, let's calculate the resonant frequency (ω) of the circuit:

ω = 1 / √(LC) = 1 / √(10 * 10^(-2)) = 1 / √1 = 1 rad/s.

The applied voltage can be written as E(t) = E * cos(ωt), where E is the amplitude of the voltage.

Comparing this with the given voltage E(t) = 200 * cos(5t), we can equate the angular frequencies: ω = 5.

Now, let's find the impedance (Z) of the circuit:

Z = √(R^2 + (Xl - Xc)^2),

where R is the resistance, Xl is the inductive reactance, and Xc is the capacitive reactance.

R = 20 Ω

Xl = ωL = 1 * 10 = 10 Ω

Xc = 1 / (ωC) = 1 / (5 * 10^(-2)) = 20 Ω

Plugging in these values, we get:

Z = √(20^2 + (10 - 20)^2) = √(400 + 100) = √500 ≈ 22.36 Ω.

The amplitude of the current (I) can be calculated using Ohm's Law:

I = E / Z = 200 / 22.36 ≈ 8.94 A.

The phase angle (Φ) can be found using the relationship between resistance, inductive reactance, and capacitive reactance:

tan(Φ) = (Xl - Xc) / R = (10 - 20) / 20 = -0.5.

Therefore, Φ ≈ -0.464 rad.

The subsequent current in the series RLC circuit is given by i(t) = 8.94 * cos(5t + 0.464) A.

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Answer:

EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

Explanation:

Answer:

Velocity and force consists of two vectors as they both have magnitude and direction

Pair of physical quantities consists of two vectors are velocity and force.

"The seven elemental physical quantities are mass, time, temperature, mole, length, luminosity, and electrical charge. "Some derived physical quantities are velocity, heat, density, pressure, and momentum. Extensive physical quantities depend on the amount of substance or the size of the object.

"Velocity is the speed at which something moves in a particular direction. For example as the speed of a car travelling north on a highway, or the speed a rocket travels after launching. "The scalar means the absolute value magnitude of the velocity vector is always be the speed of the motion.

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Answer:

a and c

Explanation:

didn't actually do the math, but i am pretty positive that those are equal

Answer:

Current in the circuit(I) = 0.5 ampere

Explanation:

Given:

Number of resistors = 2 (10 ohm each)

Series of resistors

EMF = 10 volt

Find:

Current in the circuit(I)

Computation:

Total resistance in series = R1 + R2

Total resistance in series = 10 + 10

Total resistance in series = 20 ohm

Current in the circuit(I) = EMF / Total resistance in series

Current in the circuit(I) = 10 / 20

Current in the circuit(I) = 0.5 ampere

Answer:   0.0035

============================================

Explanation:

The exponent is -3, so we move the decimal point 3 spots to the left to go from 3.5 to 0.0035

If the exponent was positive, then we would move the decimal point to the right that amount of spaces.

The magnitude of the adhesive force allows the top block to remain

attached to the bottom when the blocks and the wire are balanced.

The option that must be true is; \(\mathbf{W_{bottom} = F_{adhesion}}\)

Reason:

The tension exerted by the wire attached to the top block = T

Magnitude of the adhesive = \(F_{adhesion}\)

Weight of the top block = \(W_{top}\)

Weight of the bottom block = \(W_{bottom}\)

Given that with the exertion of the tension, the two blocks remain at rest, we have;

The adhesive causes the bottom block to remain attached to the top block, we have;

Therefore, the magnitude of the adhesive force adds the bottom weight, to the top, weight, which gives;

The magnitude of the adhesive force = The weight of the bottom block

Therefore;

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Answer:

Wbottom=Fadhersion it was right on y test

Explanation:

Answer:

382 Hz = v / 2L

v = 382 Hz * 2L

v = 764 Hz * 4L

v = 3056 Hz * L

L = v / 3056 Hz

L = 343 m/s / 3056 Hz

L = 0.246 m

Therefore, the length of the closed-end pipe is 0.246 m.

Answer:

The velocity of the wave is 100 m/s.

Explanation:

It will take approximately 0.053 seconds for a pulse to travel from one support to the other if a cord of mass 0.55 kg is stretched° between two supports 30 in apart and if the tension in the cord· is 150n

We'll be using the following terms in the solution: mass, tension, distance, pulse, and time. Calculate the linear mass density (μ) of the cord.
μ = (mass of the cord) / (length of the cord)
μ = 0.55 kg / 30 in

Note: We need to convert inches to meters. There are 0.0254 meters in 1 inch.
30 in * 0.0254 m/in = 0.762 m

Now, we can find the linear mass density:
μ = 0.55 kg / 0.762 m = 0.721 kg/m

Calculate the speed (v) of the pulse on the cord using tension (T) and linear mass density (μ).
v = √(T / μ)
v = √(150 N / 0.721 kg/m)

Solve for the speed of the pulse.
v ≈ √(207.49 m²/s²) ≈ 14.4 m/s

Calculate the time (t) it takes for the pulse to travel between the supports.
t = (distance between supports) / (speed of pulse)
t = 0.762 m / 14.4 m/s

Solve for the time.
t ≈ 0.053 s

So, it will take approximately 0.053 seconds for a pulse to travel from one support to the other.

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Using the free body diagram, let's determine the scenario the diagram illustrates.

From the free body diagram, we can see that the weight is acting on the object while the tension will be the force which supports the object.

The tension in this case, helps hang the object while the weight is the product of the mass of the object and the force of gravity acting on the object.

Tension can be defined as the pulling force transmitted through a rope or string.

Therefore, the best scenario which is represented by the free body diagram is a sign board supported by two strings.

ANSWER:

A signboard supported by

The values of load resistance that will the voltage source appear stiff is 1 ohm or larger

A voltage source is said to be "stiff" if its output voltage does not vary much with changes in the load resistance. In other words, the output voltage remains relatively constant even if the load resistance changes.

To determine the values of load resistance for which the voltage source appears stiff, we can use the following formula:

Vout = Voc × Rload / (Rload + Rint)

where Vout is the output voltage, Voc is the open circuit voltage (the voltage across the terminals when there is no load), Rload is the load resistance, and Rint is the internal resistance of the voltage source.

If we want the voltage source to appear stiff, we want the output voltage to remain relatively constant as the load resistance changes. This means that the denominator of the above formula (Rload + Rint) should be much larger than the numerator (Rload). In other words, Rint should be much smaller than Rload.

In this case, the internal resistance Rint is 0.1 ohms. So, for the voltage source to appear stiff, we want the load resistance Rload to be much larger than 0.1 ohms.

One way to quantify "much larger" is to use a rule of thumb that Rload should be at least 10 times larger than Rint. So, in this case, we want:

Rload >= 10 × Rint

Rload >= 1 ohm

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