Which vector shows the velocity of the yo-yo at this moment?

Answer:

The amount of thermal energy needed is 626.6 J

Explanation:

When a certain amount of heat energy Q is supplied to a substance, the temperature of the substance increases according to the equation

where m is the mass of the substance is the specific heat capacity of the substance is the change in temperature

Answer:

642.6 kJ

Explanation:

Using the formula for heat energy required:

[tex]Q = mc \Delta T[/tex] ,

where:

C   → specific heat capacity  =  1.68 kJ/kg°C

Q   → heat energy required  =  ?

m   → mass of the object  =  4.5 kg

ΔT → change in temperature  =  97°C - 12°C  =  85°C,

Q = 4.5  x  1.68  x  85

   = 642.6 kJ

Answer:

i think the planet is Uranus

Chemical reactions produces new substances and may be a synthesis, decomposition, combustion, replacement, or neutralization reaction.

Chemical reactions are changes which occurs in substances producing changes in the chemical properties of the substance.

The chemical reactions described are as follows:

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Answer:

Explanation:

[tex]\text{Since the fulcrum lies in between the load and effort, it is class I lever.}[/tex]

[tex]\text{Mechanical advantage (M.A.) of levers is given by,}[/tex]

[tex]\text{M.A.=effort armload arm=50cm,10cm}[/tex]

[tex]\text{Thus, mechanical advantage , M.A. = 5.}[/tex]

[tex]\text{Given, effort (E)=10N, Load(L)=?}[/tex]

∴ [tex]L=E \times M.A.[/tex]

[tex]=10\times5=50N[/tex]

Answer:

[tex]\fbox {100 cm}[/tex]

Explanation:

Finding Mechanical Advantage :

MA = Load / Effort

MA = 1000/250

MA = 4

Finding length of effort arm :

Load arm = Effort arm / 4

Effort arm = 25 cm x 4

Effort arm = 100 cm

The total angle, in radians, through which a point on the flywheel rotates is 7540 radians

From the question, we are to determine the total angle in radians

Using the formula,

[tex]\omega = \frac{\theta}{t}[/tex]

Where [tex]\omega[/tex] is the angular velocity

[tex]\theta[/tex] is the angle

and t is the time

From the given information,

[tex]\omega = 30 \ rev/s[/tex]

Convert to rad/s

[tex]\omega = 30 \times 2\pi \ rad/s[/tex]

[tex]\omega = 188.496 \ rad/s[/tex]

and t = 40 s

From the formula

[tex]\omega = \frac{\theta}{t}[/tex]

[tex]\theta = \omega t[/tex]

∴ [tex]\theta = 188.496 \times 40[/tex]

θ = 7539.822 rad

θ ≅ 7540 rad

Hence, the total angle, in radians, through which a point on the flywheel rotates is 7540 radians

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A car initially traveling at 15.0 m/s accelerates at a constant rate of 4.50 m/s2 over a distance of 45.0 m, the time taken to cover this distance  is mathematically given as

t = 2.24 s

Generally, the equation for Kinematic relation is mathematically given as

S = ut + (1/2)at^2

Therefore

45 = 15t + 2.25 t^2

2.25 t^2 + 15 t -45 = 0

t = 2.24 s

In conclusion, the time is taken to cover this distance

t = 2.24 s

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Answer:

The change in time for the first quarter is  seconds.  = 2.07

The change in time for the second quarter is  seconds.

=1.09

The change in time for the third quarter is  seconds.

=0.95

The change in time for the fourth quarter is  seconds.=0.81

Explanation:

Hope this helped.

Momentum is the rate of increase in speed or decrease in speed after application of force

The formula is given by

p is momentum

m is mass

v is velocity

An example of an object moving in projectile motion is; A basketball being thrown into a net.

Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity.

Now, an example of an object moving in a projectile motion is throwing a basketball into a basketball net in a game. This is because the ball is thrown into the air at an angle towards the net and as such is subject to only acceleration of gravity.

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A virtual and erect image is formed by concave mirror.

The focal length of the mirror is the distance between the lens and the image sensor.

It is also defined as the distance from a lens or mirror to the focal point.

It is also stated by the formula

[tex]\frac{1}{y} +\frac{1}{u} = \frac{1}{f}[/tex]

u = -50 cm and f = 0.50 m (50cm)

[tex]\frac{1}{v} +\frac{1}{-50} =\frac{1}{50}[/tex]

v= -50 cm

where - sign shows that image is virtual.

Magnification  m= [tex]\frac{v}{u}[/tex]

m = -50/50

m = 0

hence, virtual and erect image will be formed.

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Answer:

This process is CONDENSATION

Explanation:

Condensation occurs when water vapour loses some of its kinetic energy to a colder body and changes into liquid state.

Answer

100% - double

200% - triple

300% - 4X

For a 300% increase the KE must be 4 time as large

KE2 / KE1 = M V2^2 / M V1^2 = (V1 / V2)^2 = 4

So V2 = 2 V1 for the requested increase

M V2 / M V1 = V2 / V1 = 2

So the momentum would double for a 100% increase

Answer:

a) 22.2 N

Explanation:

To find load effort. Identify load, efficiency and velocity ratio (VR)

Here given:

Effort :

[tex]\rightarrow \sf \dfrac{MA}{VR} = \dfrac{Load \ \div \ efficiency }{VR} = \dfrac{100 \div 75 \% }{6} = 22.22 \ N[/tex]

Answer:

[tex]\frac{\pi }{15}[/tex]m

Explanation:

At 10am, the minute hand and hour hand are ' 2 hours apart', since the minute hand is at 12pm and hour hand is at 10am.

Angle between the two hands = 2/12 * 360

= 60°

Arc Length = [tex]2\pi r(\frac{60}{360} )[/tex]

= [tex]2\pi (0.2)(\frac{1}{6} )\\= \frac{\pi }{15} m[/tex]

Answer:

B. Time and Space

Explanation:

Matter is a pshyical or corporeal susbtance in general, whether solid, liquid, or gaseous especially as distinguised from incorpeal substance, as spirit or mind, or form qualities, actions, and the

Within this time-and-space boundary, all matter exists. All matter is made up of atoms. Because these atoms take up space in the universe, solids, liquids, and gases are recognized as existing and may be found in all three dimensions.

Time is a figurative term. Space has three dimensions but time only has one.

Answer:

time and space (A)

Explanation:

When something physically exists, it must exist in time and space. Matter/atoms are recognized as existing--which must be described by existence in time and space.

> Time and space exist as the same property (time cannot exist without space), and is called space-time

> Time is seen as relative {theory of special relativity} meaning that it changes based on your perspective and the space it exists in.

hope this helps!!

The acceleration of the plane will be −8 m/s²

How to find the acceleration of a plane?

Acceleration is the rate of change in velocity over time (Δv/t).

Given, that the initial velocity of the plane u=480 m/s

The final velocity of the plane is zero after landing, v= 0 m/s

t= 1 minute= 60 seconds

we know, v=u + at

0= 480 + 60a

a=[tex]\frac{-480}{60}[/tex]  = -8m/s²

Thus, the acceleration of the plane is -8 m/s²

(negative acceleration implies that the object is slowing down)

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Answer:

A

Explanation:

The electrostatic force and strong nuclear force are opposite forces. The electrostatic force causes the repulsion beteween the positively charged protons in the nucleus but the strong force keeps the nucleus glued together but overcoming the electrostatic force. They would both increase upon the addition of a proton or radioactivity will result.

Answer:

Actually, the correct answer is D. The system releases 75 J of heat, and its volume doubles.

Explanation:

I took this computer-scored test, and while I was stuck on this answer for a while, I was able to get 100%. This was my thought process:

We know that molecular motion increases with an increase in temperature, because collisions increase. For that reason, for molecular motion to decrease in a system, as the question states, the system must RELEASE heat and decrease in temperature.  Additionally, when a system's volume is smaller, its molecular motion increases. This is because the molecules hit the container more easily and more often. If the volume is halved then, the molecules would have MORE motion, which we aren't looking for in this question! Therefore, the volume must DOUBLE so that less molecular motion takes place. The answer is D! :)

The degree measure of angle ∠ bac will be 70°. Option C is correct.

The angle is the distance between the intersecting lines or surfaces. In addition, the angle is expressed in degrees. The angle is 360 degrees for a full revolution.

Given expression;

[tex]\rm cos^{-1}(\frac{3.4}{10})=x \\\\ x = cos^{-1}(0.34) \\\\ x = 70.12^0[/tex]

The degree measure of angle ∠bac will be 70°.

Hence option C is correct.

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Answer:

70 Degrees

Explanation:

Geometry B E2020!! :3

Answer:

designing a solution

Explanation:

after knowing & identifying a problem we start putting a solution

Answer:

15.29 kg

Explanation:

F = k * d                  5cm = .05 m

 = 3 x 10^3  n/m     *   .05 m  = 150 N

                                                =  150 kg -m / s^2

150 kg- m / s^2   / 9.81 m/s^2 =15.29kg

Answer:

friction

Explanation:

i believe that is the answer

Answer:

Option C - Friction

Explanation:

Inertia would be an invalid option as it is not changing state.

Gravity would be invalid option as it will stay on the ground constantly.

Friction would be a valid option as the friction between the bottom part of the furniture and the floor are being rubbed together .

Air resistance is valid but will not be as strong as the friction

Therefore Option C - Friction will be the primary force that the person has to work against to keep this piece moving .  

Hope this helped and have a good day

It is much easier to balance a thing that has a large base of support and a low center of gravity. The object won't topple over as a result of little center of gravity wobble because of the wide base and low center of gravity. Therefore, balancing a nail on its base as opposed to its tip would be simpler.

Answer:2140 watts x 6 hours =12.84 kWh. Are you looking for specific type units such as Jules?

Answer:

Your answer is right

Answer:

20 days, 480 hours

Answer:

natural is the answer

Friction is a natural force which exist

The specific heat capacity of iron is greater than that of lead hence the iron will melt the ice more than the lead.

The specific heat capacity refers to the amount of heat that is required to raise the temperature of 1Kg of a body by 1 K.

We know that the specific heat capacity of iron is greater than that of lead hence the iron will melt the ice more than the lead.

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