Find the work done while lifting a 115 kg sofa 1.5 m off the ground.
Find the weight first

Answer:

potential energy depends on position or shape

Answer: Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

Answer:

just give the other person brainlyest

Explanation:

Hi there!

(A) The force that the ball exerts on Earth is equal in magnitude to the force that Earth exerts on the ball.

Gravitational force is an example of an action-reaction pair:

[tex]F_{1,2} = -F_{2,1}[/tex]

Gravitational force is given by the equation:

[tex]F_g = \frac{Gm_1m_2}{r^2}[/tex]

Plugging in the masses of the Earth and ball, gravitational constant, and radius will result in the SAME GRAVITATIONAL FORCE exerted by both objects on each other.

Explanation:

The resulting displacement of the medium during complete overlap is -1 unit. This is still destructive interference since the two interfering pulses have opposite displacements.

The galaxy is known to contain stars of different ages. The indicated features as it points  from left to right are;

Bottom row

The Milky Way Milky exist because  our Sun (a star) and all the planets close to it are part of a galaxy called the Milky Way Galaxy.

A galaxy is known to be a large group of stars, gas, and dust bound together by the force of gravity.

Our galaxy is called by the name the Milky Way because it is usually seen or it appears as a milky band of light in the sky when you view it in a really dark area.

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Answer: D, All of the above!

Explanation:

I just helped my daughter with this test and it was correct!! Good luck !!

Answer:

a= -5404.6 [m/s²]; F=785.75 [N].

Explanation:

1. Determine is the acceleration of the ball:

equation of the distance (0.135m) is:

[tex]S=-\frac{at^2}{2} +v_0t,[/tex]  where S=0.135[m]; a - required acceleration; t - elapsed time; v₀ - initial velocity (38.2 m/s);

also the required acceleration is:

[tex]a=\frac{v-v_0}{t}, where[/tex] V - the end velocity (0 m/s), t - elapsed time, ₀ - initial velocity (38.2 m/s).

Using the equations of reqruired acceleration and the distance it is possible to make up and solve the next system:

[tex]\left \{ {{a=-\frac{38.2}{t} } \atop {S=-\frac{at^2}{2}+38.2t }} \right. \ => \ \left \{ {{a=-\frac{38.2}{t} } \atop {0.5at^2-38.2t=0.135}} \right. \ => \ \left \{ {{a=-\frac{38.2}{t} } \atop {19.1t-38.2t=0.135}} \right. \ => \ \left \{ {{a=-5404.6} \atop {t=0.007}} \right.[/tex]

finally, a≈-5404.6 [m/s²].

2. Determine the force applied by Alejandro.

the energy is:

[tex]E=\frac{mv^2}{2}; \ or E=FS, where \ m-the \ mass; \ v-velocity; \ F-required \ force; S-distance;[/tex]

According to these two equations, the required force is:

[tex]F=\frac{E}{S}=\frac{mv^2}{2S};[/tex]

F=0.145*38.8²/2/0.135≈785.75 [N].

note, the suggested way is not the shortest one and not the only one.

P.S. if it is possible, check the arithmetic operations and the provided answers in other sources.

What is the weight of a car with the mass of 1000 kg?

Answer: it is 9800 N.

The distance the bus travelled in 20 seconds is 12.75 m

The first step is to write out parameters given in the question

Final velocity= 15

Initial velocity= 5

Time= 20

Distance= ?

V² + U²= 2as

15² + 5²= 2(9.8)s

225+25= 19.6s

250= 19.6s

s= 250/19.6

= 12.75

Hence the distance the bus travelled in 20 seconds is 12.75 m

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

m is the mass in kg

v is the velocity of the object in m/s

From the question

m = 100 kg

v = 10 m/s

We have

[tex]k = \frac{1}{2} \times 100 \times {10}^{2} \\ = 50 \times 100 \\ = 5000 \: \: \: \: \: \: \: \: [/tex]

We have the final answer as

Hope this helps you

[tex]\huge \bf༆ Answer ༄[/tex]

First, find the force exerted by the box.

[tex] \sf \: F = ma [/tex]

The required terms are :

Calculate the force : -

_____________________________________

Pressure can be calculated using this formula : -

The stated terms are :

Calculate the Pressure now : -

[tex]꧁  \:  \large \frak{Eternal \:  Being } \: ꧂[/tex]

Answer:

true

Explanation:

Energy stored in the nuclei of atoms can be used to generate electricity. ... Most of the energy of food is converted to heat.

Answer:

Socratic app

Explanation:

it will help you

Answer:

2 m/s2

Explanation:

|acceleration| = (change in speed) divided by (time for the change)

Change in speed = (end speed) minus (start speed)

Initial speed of walking = 1 m/s

Final speed of walking = 3 m/s

Change of speed in walking = (3 - 1) m/s

                                            = 2 m/s

Time in which the change of speed occurred = 1 sec

Then

Acceleration = Change of Speed/ Time taken

                    = 2/1 m/s^2

                    = 2 m/s^2

Therefore the answer is 2 m/s2.

The acceleration is 2 m/s².

Acceleration can be defined as the rate of change of velocity.

The acceleration can be calculated using the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, The acceleration is 2 m/s².
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Answer:

represents the energy the object possesses by virtue of its motion. ... This type of energy is generally known as kinetic energy. Thus, Equation (16) states that any work done on point object by an external force goes to increase the object's kinetic energy.

Explanation:

   The relation between some bodies are involved by Object's position and motion, i.e., through potential and kinetic energy in which it actually explained by Newton's second law of motion.

Definition:

      Newton's second law states that force is equal to the rate of change of momentum, i.e., the mass and velocity.

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Water waves shake energy over the surface of the sea, while sound waves thump energy through the body of the air. Sound waves are compression waves. They're also called longitudinal waves because the air vibrates along the same direction as the wave travels.

Answer:

[tex]\boxed {\boxed {\sf A. \ 2 \ m/s}}[/tex]

Explanation:

Speed is the distance traveled per unit of time, or how fast an object is moving.

It is calculated by dividing the distance by the time.

[tex]s= \frac{d}{t}[/tex]

Jake traveled 10 meters in 5 seconds.

Substitute the values into the formula.

[tex]s= \frac{10 \ m}{5 \ s}[/tex]

Divide.

[tex]s= 2 \ m/s[/tex]

Jake's speed was 2 meters per second and choice A is correct.

The hazards of using electricity in this kitchen include the following below:

Risk of electric shocks: These electrical appliances use an electric source for their various functions in which electric current flows through them when

turned on. Exposure and contact of the naked wire with individuals will bring

about shock.

Risk of burns: The kitchen has various heating appliances such as toaster,

kettle,iron and oven which may result in burns if not carefully handled.

Risks of fire : The heat and electric current from these appliances can trigger a spark and fire which may raze down the building is also another hazard.

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Answer:

15J

Explanation:

Let's assume force and motion have the same direction, so the dot product between the two reduces to the product of magnitudes.

If you studied calculus:  [tex]w= \int \limits^3_0 6x-4dx[/tex], by definition. Some "easy" math, that's [tex](3x^2-4x)\limits^3_0=27-12 - 0 = 15 J[/tex]

Else. we have to take the long way.  if the force was constant, and you plotted magnitude of the force vs position in a graph, you would get an horizontal line, and your work would be the area between the line and the x axis. And there is no reason why it shouldn't be the same for a variable force - if you think about it, it's the same way they justify the position formula for an accelerated motion. Let's graph it and start debating - sorry for my paint skills. We can easily say that in the green triangle the force is opposing the motion, so its work is negative, while in the blue area force and displacement go in the same direction, thus work is positive. Now it's just to calculate the area of two triangles

For the green one, it's a right triangle with side lengths 4 and 2/3, whose area is [tex]\frac12(4)(\frac23) = \frac43[/tex].

For the blue triangle, it's again a right triangle with side lengths 14 and 3-2/3= 7/3, whose area is [tex]\frac12(14)(\frac73) = \frac{49}3[/tex]

Our total work is the difference between the two, or [tex]w= \frac{49}3-\frac43 = \frac{45}3 = 15[/tex]

Answer:

the vertical velocity is constant.

Explanation:

The horizontal velocity of a projectile is constant (a never changing in value), There is a vertical acceleration caused by gravity; thus, the vertical velocity of a projectile changes. and the horizontal motion of a projectile is independent of its vertical motion.

Answer:

The density of water is around 997 kg/m³ of 1 gran per millilimeter

Answer:

A hydrometer is an instrument used to determine specific gravity

Answer:

it is used determine specific gravity

Explanation:

and u can see them in use by measuring proof of moonshine

Answer:

kinetic energy equation is 85,714.2857 kg.

Explanation:

When calculating the binding energy, z multiplied by the sum of mass of proton and mass of electron.

Z in binding energy calaculation is the number of protons in the nuclides.

To calculate the binding energy we use the formula below;

E = Z (mp + me) + Nmn − mn

Where;

Thus, when calculating the binding energy, z multiplied by the sum of mass of proton and mass of electron.

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Answer: Levers

Explanation: Levers lifte

the machines arm