In a certain process, 400 j of heat is added to a system and the system simultaneously does 100 j of work. the change in internal energy of the system is:_________

Answer:

Its C

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Now bye

The mass of a 9.0 cm³ cube of lead is approximately 8.3166 kilograms.

To calculate the mass of the lead cube, we use the formula:

Mass = Density x Volume

In this case, the given density of lead is 11.4 g/cm³, and the volume of the cube is 9.0 cm³.

First, let's calculate the volume of the cube. Since it is a cube, we can find its volume by cubing the length of one side. The given length is 9.0 cm:

Volume of the cube = (9.0 cm)³ = 729.0 cm³

Now that we have the volume, we can calculate the mass by multiplying the volume by the density:

Mass = 11.4 g/cm³ x 729.0 cm³

Multiplying these values gives us:

Mass = 8316.6 grams

Converting grams to kilograms, we get:

Mass = 8.3166 kilograms

Therefore, the mass of the 9.0 cm³ cube of lead is approximately 8.3166 kilograms.

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If the current in a long straight wire is increasing, the current is induced in the circular loop will be generated in the nearby circular loop.

Faraday's Law states that the electromotive force (EMF) induced in a circuit is proportional to the rate of change of magnetic flux passing through it. As the current in the straight wire increases, the magnetic field around it strengthens, and the change in magnetic flux through the circular loop causes an induced current. The direction of this induced current is determined by Lenz's Law, which states that the induced current will flow in such a way as to oppose the change in magnetic flux causing it.

In this case, as the magnetic field due to the straight wire increases, the induced current in the circular loop will flow in a direction that generates a magnetic field opposing the increase in the straight wire's magnetic field. The magnitude of the induced current depends on the rate of change of the magnetic field, the loop's size, shape, and distance from the straight wire, as well as the resistance of the loop's material. If the current in a long straight wire is increasing, the current is induced in the circular loop will be generated in the nearby circular loop.

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The current in the circuit would be approximately 13.33 Amps.

To find the current in the circuit, we can use Ohm's Law, which states that the current (I) flowing through a circuit is equal to the voltage (V) divided by the resistance (R).

In this case, the resistance of each element is 36 ohms, and they are connected in parallel. When resistors are connected in parallel, the total resistance (Rt) can be calculated using the formula:

1/Rt = 1/R1 + 1/R2 + 1/R3 + ...

1/Rt = 1/36 + 1/36

1/Rt = 2/36

1/Rt = 1/18

Rt = 18 ohms

To calculate the current (I) in the circuit, we can use Ohm's law:

I = V / Rt

I = 240 V / 18 ohms

I ≈ 13.33 Amps

The correct option is d. 13.3 Amps.

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Answer:

66.86m

Explanation:

Velocity of ball thrown, u = 23.5 m/s

Initial height of the ball above the water, H = 11.5 m

Angle of projection, θ = 39.5°

Vertical components of veloclty = usinθ

Horizontal components of veloclty = ucosθ

The soft ball hits the water after time 't'

Considering the second equation of motion

S = ut + 1/2at^2........ 1

But since the ball went through motion under gravity ( free fall ) rather than linear motion, then equation 1 can be rewritten as:

H = ut +/- 1/2gt^2

H = - 11.5m

U = usinθ

θ = 39.5°

a = -g = -9.8m/s^2

- 11.5m = 23.5(sin39.5°)t + 1/2(-9.8)t^2

-11.5m = 23.5(0.6360)t - 4.9t^2

-11.5m = 14.946t - 4.9t^2

4.9t^2 -14.946t-11.5m = 0

Since the ball drifted horizontally

D = (Ucosθ)t

Where θ = 39.5°

U = 23.5m/s t=

Alternatively,

horizontal component of the velocity is 23.5 cos 39.5º = 18.1331 m/s

now how long does it take the ball to raise to a peak and fall to the water.

vertical component of velocity = 23.5 sin 39.5º = 14.947m/s

time to reach peak t = v/g = 11.947/9.8 = 1.5252 sec

peak reached above cliff top is

h = ½gt² = ½(9.8)(1.5252)²

= ½×22.797

= 11.3985m

now the ball has to fall 11.3985+ 11.5 = 22.8985m

time to fall from that height is

t = √(2h/g) = √(2• 22.8986/9.8) = 2.1617 sec

add up the two times to get time it is in the air, 2.1617 + 1.5252 = 3.6869

now haw far does the ball travel horizontally in that time

d = vt = 18.1331 ×3.6869= 66.856m

= 66.86m

Answer:

gagaggagagagagooo

Explanation:

gagagagagagagagaoooo

Answer:the first one gravitational potential energy turns into kinetic energy

Explanation:

Answer:

A) Gravitational potential energy transforms into kinetic energy.

Explanation:

Edge

Motion involves the change of position of an object or organism with time with respect to a frame of reference. Here are five activities involving motion in our day-to-day living:

1. Driving a car- while driving a car, you move from one place to another, which involves motion. This includes a change in position concerning a reference point.

2. Walking- Walking is the simplest example of motion in everyday life. The movement of the legs is involved when a person is walking.

3. Riding a bicycle- When riding a bike, you move from one place to another, which involves motion. This includes a change in position concerning a reference point.

4. Swinging on a swing- This involves the motion of swinging back and forth. It is possible to describe the motion of a swing using physics terms such as period and amplitude.

5. Riding a roller coaster- Riding a roller coaster involves different types of motion, such as forward motion, upward and downward motion, and circular motion. Riders experience different forces like gravitational and centrifugal force. These are some of the examples of motion in our day-to-day living.

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explanation:

Here,

Using Formula;

v = u + at

or, 7 = 0 + (6.6*t)

or, 7 = 6.6t

or 7/6.6 = t

or, t = 1.06s

I think it will help you....

Answer:

Mrs Hamilton

Explanation:

Answer:huh

Explanation:

Answer:

The south pole of one magnet is near the south pole of the other

magnet.

Answer:

i say A : )

Explanation:

Answer:

Its 13n

Explanation:

for 1n its 0.2 times that by 13 and you get 2.6

Answer:

the answer is 8n

Explanation:

hope this helps

B. A wave travels through medium. Hope this helped!

Answer:

V = I×R

where -

V = potential difference across

I = current flowing in the circuit

R = Equivalent Resistance in the circuit

Answer:

Answer:

V = I×R

where -

V = potential difference across

I = current flowing in the circuit

R = Equivalent Resistance in the circuit

Explanation:

The force being applied to each bounce of the pebble as it moves downstream is a contact force.

A contact force is a force that acts upon objects when they are in physical contact with each other. In this case, the pebble comes into contact with the surface of other rocks as it bounces off them, and the force exerted during the bounce is a result of this contact.

Convective force refers to the transfer of heat or mass through the movement of a fluid or gas, and it is not applicable in the context of a pebble bouncing off rocks.

The strong force, also known as the strong nuclear force, is a fundamental force in nature that binds atomic nuclei together. It is not relevant to the bouncing of a pebble.

Non-contact forces, such as gravitational force or electromagnetic force, do not involve direct physical contact between objects and are not applicable to the scenario described.

Therefore, the correct answer is a contact force.

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Answer:

The more mass an object has, the greater its gravitational field and gravity force will be.

Explanation:

gravity force = mass × gravitational field strength (g)

The more mass, the more g-force.

There are 3.1x10²⁰ electrons flowing through this device.

Calculation:

\(Q=n_e*q_e=n_e*(1.6*10^{-19}C)\)

\(I=\frac{Q}{T}\)

Then

\(I=\frac{n_e*1.6*10^{-19}}{10s}=5A\)

Finally,

\(n_e=3.125*10^{20}electrons\).

An electrical device is a device that relies functionally on electrical energy to power its core. They contrast with traditional mechanical devices that rely on various energy sources such as fuel and human power. Electronic devices are devices that control the flow of electric current for information processing and system control.

Prominent examples are transistors and diodes. Electronic devices are usually small and can be assembled into packages called integrated circuits. An ID is assigned to a physical hardware device by the operating system.

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Answer:

The answer is positive.

Explanation:

In a middle of an atom, nucleus, contain neutrons (neutral charge) and protons (positive charge) so it will become positively charge nucleus.

The appropriate units for the Sun's luminosity are watts (W) or solar luminosities (L☉). Luminosity is a measure of the total amount of energy emitted by an object, such as a star, per unit time.

In the International System of Units (SI), the standard unit of power is the watt. The watt represents the rate of energy transfer or energy conversion per unit time. Since luminosity is a measure of power, it is typically expressed in watts. This unit allows us to quantify the amount of energy the Sun radiates into space.

Another commonly used unit for the Sun's luminosity is the solar luminosity (L☉). It is defined as the luminosity of the Sun. One solar luminosity is approximately equal to 3.828 x 10^26 watts. This unit is often used in astrophysics and astronomy to compare the luminosities of stars to the Sun, as stars can vary greatly in size and energy output.

Therefore, when discussing the Sun's luminosity, either watts or solar luminosities are the appropriate units to describe the amount of energy radiated by the Sun per unit time.

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The correct answer is A. The star changes too quickly.

A planet around a massive star is unlikely to evolve complex life because the star changes too quickly.

Massive stars burn through their fuel much more quickly than smaller stars, causing them to evolve much faster.

They also have a much shorter lifespan, typically only lasting a few million years compared to billions of years for smaller stars like the sun.

This means that any planet in the habitable zone around a massive star would have a very short window of opportunity for life to evolve before the star runs out of fuel, explodes as a supernova, or becomes a white dwarf.

Additionally, massive stars produce intense radiation, which can be harmful to life on nearby planets.

They may also be more likely to experience frequent flares or coronal mass ejections that could strip away a planet's atmosphere or damage any life that may have evolved.

While a planet around a massive star may be able to support life for a time, the rapid changes and short lifespan of the star make it much less likely that complex life could evolve and thrive over the long term.

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Answer:

I think it is true I'm not saying it is but if you get another person who says its true say true

Explanation:

Answer:

let the voltages of the cell be V and R the equivalent resistance of the circuit.

I1=RV∵ only one cell connected  ;

I2=RV+V=R2V∵ two cells connected in series  ;

I3=RV+RV=R2V∵ two cells connected in parallel ⇒ total current is same as sum of the currents due to each.

Now , 

LHS = 3I3I2=3R2VR2V=3(R24V2) 

RHS = 2I3(I1+I2)=2R2V(RV+R2V)=2R2VR3V=3R2therefore, LHS = RHS   

The speed at which the other car is travelling is 27.71 m/s.

The speed of the second car is calculated as follows;

f₂ = f₁(v + v₁)/(v - v₂)

where;

600 = 512(345 + 26.8) / (345 - v₂)

600/512 = (345 + 26.8) / (345 - v₂)

1.1718 = 371.8/(345 - v₂)

345 - v₂ = 371.8/1.1718

345 - v₂ = 317.289

v₂ = 345 - 317.289

v₂ = 27.71 m/s

Thus, the speed at which the other car is travelling is 27.71 m/s.

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The process of gravitational collapse does not work in the silicon-fusion cycle that produces iron. It is because the iron nuclei do not have sufficient energy and therefore will not produce the additional gas pressure to halt the collapse.

The gravitational collapse process is a process during which astronomical objects such as massive stars contract due to their own gravitational pressure.

The gravitational pull draws the matter to the core of the object thus increasing energy generation which in turn increases the temperature of the central part of the object.

Due to this fundamental process, the old structure collapse, and new structure are formed in the universe.

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Answer:

White Lake was contaminated with the Chemical Complany dispersing their waste in the lake. Eventually, they were forced to stop dumping it into the lake

Answer:

A. Her speed is 4.4 m/s, and her velocity is 0 m/s.

Explanation:

Given parameters:

Length of path = 400m

Time taken  = 6min = 360s

Unknown:

Speed and velocity  = ?

Solution:

Velocity is the displacement divide by the time. Displacement takes into the account the distance covered with specific reference to direction. Since the student started and ended the journey on the same spot, the net displacement is 0.

So,

  Since velocity  = \(\frac{displacement }{time}\)

            Velocity  = 0

Speed is the distance divided by time;

  One lap = 400m,

   four laps  = 400 x 4 = 1600m

Speed  = \(\frac{1600}{360 }\)  = 4.4m/s

A casserole made with ground beef must be cooked to at least 155°F because ground beef is a perishable food that can be contaminated with harmful bacteria like E.coli or Salmonella.

These bacteria are commonly found in raw meat, and if not cooked properly, can cause foodborne illness. Cooking ground beef to an internal temperature of 155°F is necessary to kill these harmful bacteria and make the food safe for consumption. When preparing a casserole, it's important to ensure that the ground beef is fully cooked before adding it to the dish. This can be achieved by browning the beef in a skillet and then allowing it to cook for an additional few minutes until it reaches the desired internal temperature. It's also important to ensure that the casserole is cooked thoroughly in the oven to ensure that the beef and any other ingredients are fully cooked and safe to eat.

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