What are the units for speed velocity and acceleration?

Answer:kinetic energy

Explanation:

Answer:

See the answer below.

Explanation:

The weight of the table should be equal to the weight of the table plus the weight of the book.

[tex]w_{table}=m_{table}*g\\w_{table}=200*9.81\\w_{table}=1962[N][/tex]

And for the book

[tex]w_{book}=m_{book}*g\\w_{book}=50*9.81\\w_{book}=490.5[N][/tex]

And the total weight

[tex]w = w_{table}+w_{book}\\w=1962+490.5\\w = 2452.5 [N][/tex]

For the system to be in balance, the reaction force exerted by the table on the book must be equal to the weight of the book. This force in physics is known as the normal force.

[tex]N_{force} = w_{book}\\N_{force}=490.5[N][/tex]

Answer: Yes

Explanation: Yes

Answer:

B

Explanation:

direction is literally the only difference between speed and velocity

Taking into account the definition of speed and velocity, the correct answer is option b. Unlike acceleration and velocity, speed is NOT a quantity that accounts for direction.

Speed ​​refers to the distance an object travels in a given time and is a scalar quantity.

On the other hand, velocity is a magnitude that expresses the relationship between the space traveled by an object, the time used for it and its direction. In other words, velocity refers to the interval of time it takes for an object to move towards a certain direction. Since velocity considers the direction in which an object moves, it is considered a vector character magnitude.

In summary, speed does not take into account the direction of movement, while speed implies the change of position of an object in space within a certain amount of time, that is, speed plus the direction in which said movement is produced.

Finally, the correct answer is option b. Unlike acceleration and velocity, speed is NOT a quantity that accounts for direction.

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Answer:

Explanation:

i wanna say its A

Answer:

The new position of the sailboat is 108.2 m, at N 53.3° E

Explanation:

From the image uploaded, R is the resultant displacement and it is calculated as;

R² = 90² + 60² (Pythagoras theorem)

R² = 11700

R = √11700

R = 108.2 m

The direction of the boat is given by θ in the image uploaded;

tanθ = opp/adj

tanθ = 90 / 60

tanθ = 1.5

θ = tan⁻¹(1.5)

θ = 53.3°

θ = N 53.3° E

Therefore, the new position of the sailboat is 108.2 m, at N 53.3° E

Answer:

K.Eₓ = 4 K.E

K.Eₓ = 9 K.E

Explanation:

Th formula for the kinetic energy of a body is given as follows:

[tex]K.E = \frac{1}{2}mv^2\\[/tex]   ---------------equation (1)

where,

K.E = Kinetic Energy of Automobile

m = mass of automobile

v = speed of automobile

For twice speed:

vₓ = 2v

then,

[tex]K.E_{x} = \frac{1}{2}mv_{x}^2\\K.E_{x} = \frac{1}{2}m(2v)^2\\K.E_{x} = 4\frac{1}{2}mv^2\\[/tex]

using equation (1):

K.Eₓ = 4 K.E

For thrice speed:

vₓ = 3v

then,

[tex]K.E_{x} = \frac{1}{2}mv_{x}^2\\K.E_{x} = \frac{1}{2}m(3v)^2\\K.E_{x} = 9\frac{1}{2}mv^2\\[/tex]

using equation (1):

K.Eₓ = 9 K.E

A. The kinetic energy of automobile when it moves at twice the speed is 8000 J

B. The kinetic energy of automobile when it moves at three times the speed is 18000 J

Let the mass of the automobile be constant.

Let the initial velocity be v

A. Determination of the kinetic energy of the automobile when it moves at twice the speed.

KE₁ /v₁² = KE₂ / v₂²

2000 / v² = KE₂ / (2v)²

2000 / v² = KE₂ / 4v²

Cancel out v²

2000  = KE₂ / 4

Cross multiply

KE₂ = 2000 × 4

KE₂ = 8000 J

B. Determination of the kinetic energy of the automobile when it moves at three times the speed.

KE₁ /v₁² = KE₂ / v₂²

2000 / v² = KE₂ / (3v)²

2000 / v² = KE₂ / 9v²

Cancel out v²

2000  = KE₂ / 9

Cross multiply

KE₂ = 2000 × 9

KE₂ = 18000 J

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During the "U" part of the turn, the car would follow an approximately circular path, and if it's moving at a constant speed, it would have to accelerate toward the center of the circle in order to change its direction.

Answer:

A = 2,

Explanation:

(3 + 2) - 7

2 -  A: 2

3 + 6 + 5

14 - B: 14

YOUR WELCOME

Answer:

[tex]\mathbf{\dfrac{F}{A}= -\dfrac{( \alpha_A + \alpha _B)\Delta T}{\bigg ( \dfrac{1}{Y_A}+ \dfrac{1}{Y_B}\bigg )} }[/tex]

Explanation:

From the information given.

The formula for Youngs modulus(Y) can be illustrated as follows:

[tex]Y = \dfrac{F/A}{\Delta L /L}[/tex]

where;

F = force

A = area

ΔL / L = the fraction of the change that occurred in the length.

If we make ΔL / L the subject of the formula, the above expression can be re-written as:

[tex]\dfrac{\Delta L}{L } = \dfrac{1}{Y}\dfrac{F}{A}[/tex]

However, the total fractional change that occurred in the length can be computed as:

[tex]\dfrac{\Delta L_{compressive \ stress}}{L} = \dfrac{\Delta L_A}{L_A} + \dfrac{\Delta {L_B}}{L_B}[/tex]

where;

[tex]L = L_A = L_B[/tex]

The area of both rods is said to be equal as well.

Thus;

[tex]\dfrac{\Delta L_{compressive \ stress}}{L} = \dfrac{1}{Y_1} \dfrac{F}{A}+ \dfrac{1}{Y_2}\dfrac{F}{A}[/tex]

[tex]\dfrac{\Delta L_{compressive \ stress}}{L} =\bigg( \dfrac{1}{Y_1} + \dfrac{1}{Y_2} \bigg ) \dfrac{F}{A}[/tex] ----- Let this be equation (1)

Recall that:

[tex]\dfrac{\Delta L }{L }= \alpha \Delta T[/tex]

in which

ΔL = change in length

L = the original length of rod before extension

∝ = coefficient of linear expansion

ΔT = temperature change

Similarly:

The total fractional change in the length is:

[tex]\Delta L _{thermal} = \Delta L_A +\Delta L_B[/tex]

[tex]\Delta L _{thermal} = \alpha_AL \Delta T+\alpha_BL \Delta T[/tex]

[tex]\dfrac{\Delta L _{thermal}}{L} =( \alpha_A+ \alpha _B) \Delta T \ \ \ ---(2)[/tex]

The sum of both the thermal and compressive stress of the combined rod is equal to the fractional change.

Mathematically:

[tex]\Delta L_{net} = \Delta L_{thermal} + \Delta L_{compressive \ stress}[/tex]

where;

[tex]\Delta L_{net} =0[/tex]

∴

[tex]0 = \Delta L_{thermal} + \Delta L_{compressive \ stress}[/tex]

[tex]\Delta L_{compressive \ stress} =- \Delta L_{thermal}[/tex]

From equation (1) & (2)

[tex]\bigg( \dfrac{1}{Y_1} + \dfrac{1}{Y_2} \bigg ) \dfrac{F}{A}= - (\alpha_A + \alpha_B) \Delta T[/tex]

Making the stress [tex]\dfrac{F}{A}[/tex] the subject, we get;

[tex]\mathbf{\dfrac{F}{A}= -\dfrac{( \alpha_A + \alpha _B)\Delta T}{\bigg ( \dfrac{1}{Y_A}+ \dfrac{1}{Y_B}\bigg )} }[/tex]

Answer:

500 J

Explanation:

100 X 6=600

100 X 11=1,100

1,100-600=500J

Answer:

D

Explanation:

Change in speed or direction is acceleration

An object accelerates when it is moving faster. Option A is corect.

The rate of velocity change concerning time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.

The pace at which a body's velocity varies is represented by acceleration, which is a vector quantity.

[tex]\rm a = \frac{v-u}{t}[/tex]

Where,

u is the initial speed in m/sec

v is the final speed in m/sec

t is the time interval in sec

a is the acceleration in m/sec²

When an object is accelerating it speeds up.

Hence option A is correct.

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Answer:

430.5 cm

Explanation:

first we detect point digt than

323+100+6

=429

now point digt

0.7+0.6

1.5

add both:-

429+1.5

=430.5

Answer:

Carbon Dioxide

Explanation:

Isotopes can be found in Carbon 12

Answer:

Lessens

Explanation:

The performance of an engine at high altitudes is lower due to the decreasing density of air with elevation, such that at high altitude, the density is much less and a given quantity of oxygen occupies much more space at high altitudes, and the oxygen content in the air drawn in is lesser at high altitude, and the combustion power is much lesser at high altitudes when the engine speed is high up to about 4000 rpm.

Answer:

C maybe

Explanation:

A bungee jumper hangs from a bungee cord with zero velocity. If the bungee cord has a spring constant of 18 N/m and the jumper has a mass of 113 kg, he streched 6.27 m.

The zero-velocity surface is a concept that relates to the N-body problem of gravity. It represents a surface a body of given energy cannot cross, since it would have zero velocity on the surface.

It was first introduced by George William Hill. The zero-velocity surface is particularly significant when working with weak gravitational interactions among orbiting bodies.

For the purpose of locating Lagrange points, the zero-velocity surface is another crucial factor. In the rotating coordinate system, these points correspond to places where the apparent potential is extreme.

Therefore, A bungee jumper hangs from a bungee cord with zero velocity. If the bungee cord has a spring constant of 18 N/m and the jumper has a mass of 113 kg, he streched 6.27 m.

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Answer:

D

Explanation:

Answer:

a, b, a, c, that should be the order from top to bottom

Answer:

Hydrothermal vents

Explanation:

A hydrothermal vent is found along with areas of volcanic activity in the ocean floor which discharges geothermally heated water. Tectonic plates in such areas move apart at spreading centers and hotspots to form hydrothermal vent.

A hydrothermal vent ejects hot and often toxic, fluids and gases into the surrounding seawater when seawater meets magma.

Hence, the correct answer is "Hydrothermal vents".

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

v is the velocity

From the question we have

[tex]k = \frac{1}{2} \times 30 \times {15}^{2} \\ = 15 \times {15}^{2} \\ = {15}^{3} \: \: \: \: \: \: \: \: \: \: [/tex]

We have the final answer as

Hope this helps you

Answer:

i dont know the actual answer but i can tell you that it takes 4 seconds for a ball to hit the ground .

Explanation:

Answer:

44.492 kg

Explanation:

Convert pounds to kilograms.

1 lb = 0.454 kg

98 lb * 0.454 kg =44.492 kg

Answer:

what he said above is correct yes

Explanation:

Answer:

Face - off

Explanation:

Face - off is a term used in ice hockey to start periods of play and also to restart the play/action after a previous stoppage.

This face - off involves two opposing players from the 2 opposing teams standing opposite each other at an approximate distance of one sticks blade with the game official dropping the puck between them. Thereafter, two players will then to try to gain possession of the puck.