Your backpack has a mass of 8 kg. You drop it from a height of 1.3m. How much work is done by gravity as the backpack falls?

A. -102 J
B. -10.4 J
C. 102 J
D. 10.4 J

Answer:

[tex]2.2\cdot 10^{-3} \Omega[/tex]

Explanation:

The resistance of the lead block is given by

[tex]R=\frac{\rho L}{A}[/tex]

where

[tex]\rho = 2.2\cdot 10^{-5}\Omega cm[/tex] is the resistivity of lead

[tex]L = 10 cm[/tex] is the length of the block

[tex]A=0.10 cm^2[/tex] is the cross sectional area of the block

Substituting into the equation, we find

[tex]R=\frac{(2.2\cdot 10^{-5} \Omega cm)(10 cm)}{0.10 cm^2}=2.2\cdot 10^{-3} \Omega[/tex]

Permanent magnet:

Hard to demagnetize

Hard

Bar magnet

Temporary magnet:

Easy to demagnetize

Soft

Thumbtack

Answer:

Permanent magnet:                    Temporary magnet:

Hard to demagnetize                  Easy to demagnetize

Hard                                             Soft

Bar magnet                                  Thumbtack

Answer:

Chlorofluorocarbons (CFC's)

Explanation:

The substances that are the most responsible for the damage done on the ozone layer are the chlorofluorocarbons (CFC's). The CFC's are very light, so they get up into the atmosphere with ease. While they are in the lower part of the atmosphere they do not cause any particular problems as the UV radiation is very limited, but that all changes when they reach the ozone layer. Once they reach the ozone layer in the stratosphere, the CFC's are exposed to much stronger UV radiation. This causes them to dissociate and release chlorine atoms. Once this has happened, these atoms manage to break down the bond between the oxygen atoms, thus destroying the ozone layer.

Using the combined gas law, we can find that the new volume of the gas would be approximately 22.62 L.

In order to find the new volume of the gas when the pressure is increased to 250 kPa and the temperature is decreased to 0°C, we can use the combined gas law.

The combined gas law states that for a given amount of gas, the ratio of pressure, volume, and temperature remains constant:

P1V1/T1 = P2V2/T2

Plugging in the values given in the question, we have:

200 kPa * 25 L / (25 + 273) K = 250 kPa * V2 / (0 + 273) K

Simplifying and solving for V2, we find:

V2 = (200 kPa * 25 L * 273 K) / (250 kPa * (25 + 273) K)

V2 ≈  22.62 L

A water pipe freezes and cracks on a cold night. (D)

There are three physical changes going on in this scenario:

1).  The air gets cold and dark at night.

2).  The water in the pipe freezes and expands.

3).  The pipe cracks.

There are no chemical changes in the description.

Answer:

A water pipe freezes and cracks on a cold night

Explanation:

A water pipe freezing and cracking is a physical change, not a chemical change. A physical change is a change in what the item looks like, feels like, or how the item has a different form. The water pipe freezing is an example of a physical change because the liquid water has turned to frozen water. The frozen water has expanded the pipe, causing it to crack. There are no chemical changes taking place in this scenario.

Mordancy.

The distance from point B to point E is the sum of the absolute values of the differences in their positions, resulting in a total distance traveled of 65 meters.

The question is asking for the distance from point B to point E. Given the points A(0m), B(15m), C(-30m), D(-20m), and E(10m), we are interested in the segment from B to E. The distance traveled from B to E includes the change from B to D followed by the change from D to E. Specifically, the distance from B to D is the absolute value of the difference between their positions, which is |15 - (-20)| = 35 meters. Then from D to E, the distance is |(-20) - 10| = 30 meters. Therefore, the total distance traveled from point B to point E is 35 meters + 30 meters = 65 meters.

Answer:

The gravitational force does change believe it or not, but the explaination for this is because the earths orbit is an oval (or a not circle) the closer it nears its self to the sun. the suns gravitational pull, pulls the earth to it bringing it closer and as it reaches the other side lets call this L when it reaches L it becomes the same gravitational pull reset as P is and another section over the sun lets call this M and when it reaches M its the same pull as Q, you get it now?

The change in the magnitude of gravitational force would show that the force is more at Q than at position P

Gravitational force or force of gravity is the force of attraction between masses in the universe.

This is given by Newtons law of gravitation as;

Force (F) is directly proportional to the product of the masses and inversely proportion to the square of the distance apart.

Since the earth's orbit is oval the distance from the center is not equal at all parts of the orbit hence points closer to the earth has more force of attraction and if it is further apart it will have lesser force of attraction in conformity to  the inverse relationship.

From the picture, point P is further apart and will have lesser gravitational force while position Q is closer to the earth amd will hae more force of attraction.

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Answer:

3, 4

Explanation:

High energy gamma rays are directed at a tumor from outside the body & gamma rays kill cancer cells in a tumor on edge.

Gamma rays are used in cancer treatment to kill cancer cells by damaging their DNA.

The use of gamma rays in cancer treatment involves the application of high-energy gamma rays to kill cancer cells. Gamma rays have characteristics similar to X-rays and are more penetrating and damaging to living tissue. In radiation therapy, high-energy radiation is used to damage the DNA of cancer cells, preventing them from dividing or killing them. This therapy can be delivered externally using a machine outside the body or internally using a radioactive substance. However, gamma rays are not absorbed only by cancer cells and can also damage healthy cells.

If you have fifty 15-ohm resistors all connected in parallel, their "effective" resistance is (15/50) = 0.3 ohms.

Current = (voltage) / (resistance)

Current = (115 V) / (0.3 ohm)

Current = 383.3 Amperes

This is an interesting question, with a VERRRRY interesting answer.  The fuse or circuit breaker that feeds the outlet where these lights are plugged in is most likely rated 15 or 20 or 25 Amperes, and it trips immediately.

But let's say it doesn't ... let's say the juice just keeps on flowing.

Power = (voltage) x (current)

These lights use energy at the rate of (115V)x(383.3A) = 44,083 watts.  This is roughly the same as the power used to run 22 toasters or 37 blow-dryers, all at the same time.  AND ... the lights are going to produce almost as much heat as 22 toasters or 37 blow-dryers all running at the same time.  The lights will probably burn the house down before long.

If electrical energy costs 20¢ per kilowatt-hour in this city, then running those lights for ONE HOUR is going to cost $8.82 !

All in all, it will be a good idea to unplug the Christmas tree lights when the family goes to bed.

The total current in the circuit when 50 parallel-connected 15-Ohm Christmas tree lights are connected to a 115VAC source is 383.5 A.

To calculate the total current of 50 parallel connected Christmas tree lights that each have 15 ohms of resistance connected to a source of 115 VAC we will apply Ohm's law which is I = V/R. Here I represents current V represents voltage and R represents resistance.

In a parallel circuit all the resistor leads on one side of the resistors are connected together and all the leads on the other side are connected together. Therefore each resistor in a parallel circuit has the same full voltage of the source applied to it. That said, each of the 50 15-ohm lights will experience the full 115 volts.

So first we calculate the current for one light: I = V/R = 115V/15Ω = 7.67 A. Being a parallel connection each light draws this same current from the power source, so for 50 light the total current I (total) drawn will be 50 * 7.67 A = 383.5 A. Therefore, the total current in the circuit is 383.5 A.

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Answer: As per Ohm's law current= voltage divided by resistance.

Explanation:

So answer is 6/2= 3 amperes.

For this case, we have by definition, that Ohm's Law states that:

[tex]I = \frac {V} {R}[/tex]

Where:

I: It's the current

V: It's the voltage

R: It's the resistance

We have to:

[tex]V = 6V[/tex]

R = 2Ω

Substituting:

[tex]I = \frac {6} {2}\\I = 3[/tex]

Also, we have that the units of the current, by dividing volts between ohms, will be amps.

Thus, the current is [tex]I = 3 \ A[/tex]

Answer:

[tex]I = 3 \ A[/tex]

Answer: Absorbs and Increases

Explanation: As temperature of this substance rises from 20°C to 50°C, the substance absorbs heat and its kinetic energy increases.

Hopefully this help you. Have a great day. :)

Answer:

Absorbs, increases.

Explanation:

As we know that the amount of heat absorb or radiate is defined by a parameter called temperature. The change in temperature is defined as the heat absorb or radiate.

In the given situation, the temperature is increased from 20°C to 50°C, this is caused due to the substance's absorption of heat.

And the temperature is defined as the measurement of average kinetic energy of all the particles which are present in object. If any body or object temperature is increasing from 20°C to 50°C than its average velocity or movement of particle becomes fast. This will lead in increase of kinetic energy.

The sack of flour would have traveled 468 meters from the point of release when it hits the ground, assuming no air resistance.

The subject of your question is related to kinematic physics, particularly projectile motion. When the airplane drops the sack of flour, we need to separate the problem into vertical and horizontal components. The horizontal component is the initial speed of the airplane, which is 60 m/s, and the vertical component is influenced by gravity alone.

Before calculating how far from the point of release the sack would have traveled, we need to find the time it takes for the sack to hit the ground. Using the equation of motion for vertical motion (that is, ignoring air resistance) (h=1/2*gt², where h is the height, g is the acceleration due to gravity and t is time), we can find the time t. Substituting the given values, 300m = 1/2*9.8m/s²*t², we find that t is approximately 7.8 s.

The horizontal distance traveled by the sack is then obtained by multiplying the time t by the horizontal velocity of the airplane. That is, d = 60m/s * 7.8s = 468 m.

So, the sack of flour would have traveled 468 meters from the point of release when it hits the ground, assuming no air resistance.

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Answer:

Explanation:

Velocity:

Formula : displacement/time

SI unit : m/s

Acceleration :

Formula: change in Velocity/time

SI unit : m/s²

Force:

Formula: mass x acceleration due to gravity

SI unit: N(newton)

Mass:

SI unit: kilogram(kg)

Answer:

1. The SI units for measuring the velocity of the car: meters per second

2.The SI units for measuring the acceleration of the car:meters per secend squared

3.The SI units of measuring force:Newton’s

4.The SI units for measuring mass:kilograms

These are the correct answers on Ed

for first question

there are four engines .. each producing 250,000 N so total comes 4*250,000 N

is has weight 400,000 kg

thus Calculate it 4*250,000/400,000 gives you the answer

2nd question

after calculating acceleration from first part

apply it to the third equation of kinematics

v^2 = u^2 + 2asS.

where s is the distance required

Answer:

Super cluster

Explanation:

Answer:

216.0 units

Explanation:

The electrostatic force between two charged objects is given by:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where

k is the Coulomb's constant

q1 and q2 are the two charges

r is the distance between the charges

In this problem, the charge of object 2 is tripled, so

[tex]q_2 ' = 3 q_2[/tex]

Substituting into the original equation,

[tex]F'=k\frac{q_1 (3 q_2)}{r^2}=3 (k\frac{q_1 q_2}{r^2})=3 F[/tex]

So, the electrostatic force will be tripled.

Since the initial electrostatic force is

F = 72.0 units

the new force will be

[tex]F' = 3 F = 3(72.0 )=216.0[/tex]

Answer:

216

Explanation:

'A' is the false one, but 'C' is also so poorly worded that it's misleading.

digestion is what you call it

did it help

Answer:

wouldnt it be chewing or breaking down the food because digesting would be more after you swallow the food and it said in your mouth

Explanation:

Answer: 40 m/s^2

Explanation:

Answer:

10m/s

Explanation:

Answer:

|F| = 2.09 × 10⁻⁸ assuming that the two ions are point charges.

Explanation:

What's the charge on each ion?

The symbol [tex]e[/tex] here stands for fundamental charge. Each electron carries a negative fundamental charge of -e. Each proton carry a positive fundamental charge of +e.

Molecules and atoms are neutral. They contain an equal number of electrons and protons. Remove one electron from a molecule or atom, and that particle will end up with more protons (which are positive) than electrons. That particle will carry a positive charge of +e become an ion (a cation to be precise.) Remove another electron and the ion will carry a charge of +2e.

For each ion [tex]q = +2 \;e = 2\times 1.60\times 10^{-19}\;\text{C} = 3.2\times 10^{-19}\;\text{C}[/tex].

What's the size of the electrostatic force between the two ions?

Consider Coulomb's Law for the electrostatic force [tex]F[/tex] between two point charges:

[tex]\displaystyle F = -\frac{k\cdot q_1\cdot q_2}{r^{2}}[/tex],

where

Make sure that all values are in SI units. Assume that the two ions are small enough that they act like point charges:

[tex]\displaystyle \begin{aligned}F &= -\frac{k\cdot q_1 \cdot q_2}{r^{2}}\\&=-\frac{8.99\times 10^{9}\cdot(3.2\times 10^{-19}) \cdot (3.2\times 10^{-19})}{(2.1\times 10^{-10})^{2}}\\ &= -2.09\times 10^{-8}\;\text{N}\end{aligned}[/tex].

The value of [tex]F[/tex] is negative, meaning that the two charges will repel each other because they are both positive. The question is asking for the magnitude of this force. Thus drop the sign in front of [tex]F[/tex] to obtain [tex]2.09\times 10^{-8}\;\text{N}[/tex], which is the magnitude of [tex]F[/tex].

Using Coulomb's Law, the magnitude of the force between two identical ions, each missing two electrons and separated by 2.1×10⁻¹⁰ m, is approximately 2.09 × 10⁻⁹ N.

To find the magnitude of the force between two identical ions, we use Coulomb's Law:

F = k × (q1 × q2) / r²

Here, k is the electrostatic constant, 8.99 × 10⁹ N⋅m²/C², q₁ and q₂ are the charges of the ions, and r is the separation distance between them.

Given:

First, calculate the charge of each ion:

q₁ = q₂ = 2 × 1.60 × 10⁻¹⁹ C = 3.20 × 10⁻¹⁹ C

Next, substitute the values into Coulomb's Law:

F = (8.99 × 10⁹ N⋅m²/C²) × [(3.20 × 10⁻¹⁹ C) × (3.20 × 10⁻¹⁹ C)] / (2.1 × 10⁻¹⁰ m)²

Simplify the calculation:

F = (8.99 × 10⁹) × (10.24 × 10⁻³⁸) / (4.41 × 10⁻²⁰)

F ≈ 2.09 × 10⁻⁹ N

Therefore, the magnitude of the force between the ions is approximately 2.09 × 10⁻⁹ N.

45 kg * 9.8 m/s^2 = 441 N.

Answer:

The force of a mass's weight is defined as its mass * acceleration due to gravity.

On Earth, g is about 9.8 m/s^2. This will be the acceleration due to gravity.

Then, 45 kg * 9.8 m/s^2 = 441 N.

Answer:

5017 kg

Explanation:

Since it is an inelastic collision, the truck and the car move together after the collision. The law of conservation of momentum states that the total momentum before and after the collision is conserved:

[tex]M u_t + m u_c = (M+m)v[/tex]

where

M is the mass of the truck

[tex]u_t = 11.0 m/s[/tex] is the velocity of the truck before the collision

m = 1290 kg is the mass of the car

[tex]u_c = 0[/tex] is the initial velocity of the car (stationary, so u=0)

v = 8.75 m/s is the final speed of the truck+car after the collision

Solving the equation for M, we can find the mass of the truck:

[tex]M u_t = Mv + mv\\M(u_t-v)=mv\\M=\frac{mv}{u_t -v}=\frac{(1290 kg)(8.75 m/s)}{11.0 m/s-8.75 m/s}=5017 kg[/tex]

Answer:

5017

Explanation:

2A, is right answer i think

Answer:

A

Explanation:

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Therefore it can not be any of the other answers because the substance was water at first but now its salty water.

ps what kind of person would drink water after you put salt in it lol.

The spectrum of infrared rays are used for the weather technology by observing the difference of temperature over specified area.

Answer : Option D

Explanation:

The infrared imagery or rather say infrared imaging is the spectral study of the infrared spectrum which is obtained by the sensors which read the certain parameters.

Here in weather technology, those sensors which are used to detect the signal or observations are scanning radiometers. The observation detected are the height of the cloud and their types. These infer in the calculation of temperature of surface water and the land.

The density of the cube is 0.466 g/cm³.

The density of a cube can be calculated by dividing its mass by its volume. The volume of a cube is calculated by cubing the edge length. In this case, the mass of the cube is 65.8 g and the length of one side is 5.22 cm. To find the volume, we cube the length: 5.22 cm * 5.22 cm * 5.22 cm = 141.158088 cm³. Then, we divide the mass by the volume: 65.8 g / 141.158088 cm³ = 0.466 g/cm³.

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Answer:

B

Explanation:

This option is exactly the same as the example. Thus it would require the same amount of heat.

Answer:

B) A 3-kg mass experiences a temperature rise of 50°C.

Explanation:

As we know that the rise in temperature for 3 kg object is 50 degree C then the heat added is given as 1000 J

so here we can say that formula of heat is

[tex]Q = ms\Delta T[/tex]

here we will have

[tex]m = mass[/tex]

s = specific heat capacity

[tex]\Delta T [/tex] = temperature rise

so here if we make all three parameters same to make this heat energy same

so correct answer will be

B) A 3-kg mass experiences a temperature rise of 50°C.

Weight = (mass) x (acceleration of gravity where the object is)

You didn't tell us WHERE the boulder is, so I have to assume that it's on Mars, where the acceleration of gravity is 3.71 m/s².

675,000 N = (mass) (3.71 m/s²)

Mass = (675,000 N) / (3.71 m/s²)

Mass = 181,941 kilograms

The same weight on Earth would suggest a mass of only 68,807 kg, so you can see how important it is to know where you are when you make your measurements.

Answer:

We know there's two forces acting on a book while it sits on a table:the force of gravity pulling it down, and the normal force of the table acting upward on the book.

Explanation:

Answer:

When the object is at rest, it stays in a balanced condition and so it does not tend to move from its current position unless an external force tend to act on it.  When the external force acts on it, there will be a displacement experienced by the object.

When a book is placed on a table, it does not move it is at rest and balanced position. So If you pick up a book from the floor and place it on the table. The potential energy of the book on the desk corresponds to the work required to move the book from the floor to the desk.

Meditation is your answer

B. Meditation is correct