________ is the speed and direction of an object

Answer:

the car slowed at a rate of 2.93 mph

Answer:

An impact which stops a moving object must do enough work to take away its kinetic energy, so extending the distance moved during the collision reduces the impact force.

Explanation:

Answer:

[tex]v_m \approx -4.38\; \rm m \cdot s^{-1}[/tex] (moving toward the incline.)

[tex]v_M \approx 4.02\; \rm m \cdot s^{-1}[/tex] (moving away from the incline.)

(Assumption: [tex]g = 9.81\; \rm m \cdot s^{-2}[/tex].)

Explanation:

If [tex]g = 9.81\; \rm m \cdot s^{-2}[/tex], the potential energy of the block of [tex]m = 2.20\; \rm kg[/tex] would be [tex]m \cdot g\cdot h = 2.20\; \rm kg \times 9.81\; \rm m \cdot s^{-2} \times 3.60\; \rm m \approx 77.695\; \rm J[/tex] when it was at the top of the incline.

If friction is negligible, all these energies would be converted to kinetic energy when this block reaches the bottom of the incline. There shouldn't be any energy loss along the horizontal surface, either. Therefore, the kinetic energy of this [tex]m = 2.20\; \rm kg\![/tex] block right before the collision would also be approximately [tex]77.695\; \rm J[/tex].

Calculate the velocity of that [tex]m = 2.20\; \rm kg[/tex] based on its kinetic energy:

[tex]\displaystyle v_m(\text{initial}) = \sqrt{\frac{2\times (\text{Kinetic Energy})}{m}} \approx \sqrt{\frac{2 \times 77.695\; \rm J}{2.20\; \rm kg}} \approx 8.4043\; \rm m \cdot s^{-1}}[/tex].

A collision is considered as an elastic collision if both momentum and kinetic energy are conserved.

Initial momentum of the two blocks:

[tex]p_m = m \cdot v_m(\text{initial}) \approx 2.20\; \rm kg \times 8.4043\; \rm m \cdot s^{-1} \approx 18.489\; \rm kg \cdot m \cdot s^{-1}[/tex].

[tex]p_M = M \cdot v_M(\text{initial}) \approx 2.20\; \rm kg \times 0\; \rm m \cdot s^{-1} \approx 0\; \rm kg \cdot m \cdot s^{-1}[/tex].

Sum of the momentum of each block right before the collision: approximately [tex]18.489\; \rm kg \cdot m \cdot s^{-1}[/tex].

Sum of the momentum of each block right after the collision: [tex](m\cdot v_m + m \cdot v_M)[/tex].

For momentum to conserve in this collision, [tex]v_m[/tex] and [tex]v_M[/tex] should ensure that [tex]m\cdot v_m + m \cdot v_M \approx 18.489\; \rm kg \cdot m \cdot s^{-1}[/tex].

Kinetic energy of the two blocks right before the collision: approximately [tex]77.695\; \rm J[/tex] and [tex]0\; \rm J[/tex]. Sum of these two values: approximately [tex]77.695\; \rm J\![/tex].

Sum of the energy of each block right after the collision:

[tex]\displaystyle \left(\frac{1}{2}\, m \cdot {v_m}^2 + \frac{1}{2}\, M \cdot {v_M}^2\right)[/tex].

Similarly, for kinetic energy to conserve in this collision, [tex]v_m[/tex] and [tex]v_M[/tex] should ensure that [tex]\displaystyle \frac{1}{2}\, m \cdot {v_m}^2 + \frac{1}{2}\, M \cdot {v_M}^2 \approx 77.695\; \rm J[/tex].

Combine to obtain two equations about [tex]v_m[/tex] and [tex]v_M[/tex] (given that [tex]m = 2.20\; \rm kg[/tex] whereas [tex]M = 7.00\; \rm kg[/tex].)

[tex]\left\lbrace\begin{aligned}& m\cdot v_m + m \cdot v_M \approx 18.489\; \rm kg \cdot m \cdot s^{-1} \\ & \frac{1}{2}\, m \cdot {v_m}^2 + \frac{1}{2}\, M \cdot {v_M}^2 \approx 77.695\; \rm J\end{aligned}\right.[/tex].

Solve for [tex]v_m[/tex] and [tex]v_M[/tex] (ignore the root where [tex]v_M = 0[/tex].)

[tex]\left\lbrace\begin{aligned}& v_m \approx -4.38\; \rm m\cdot s^{-1} \\ & v_M \approx 4.02\; \rm m \cdot s^{-1}\end{aligned}\right.[/tex].

The collision flipped the sign of the velocity of the [tex]m = 2.20\; \rm kg[/tex] block. In other words, this block is moving backwards towards the incline after the collision.

Answer:

just to have conflict

Explanation:

Answer:

·Some people find enjoyment in conflict. (Negative people and bullies)

·Sometimes the only thing that makes that person feel food is to throw people down.

·Conflict happens when two people disagree.

Explanation:

These are just some but there are many more :)

Hope this Helps

:D

Answer:

its alot

Explanation:

Answer:

The distance is [tex]d = 112.5 \ m[/tex]      

Explanation:

From the question we are told that

   The horizontal speed is  [tex]v_x = 30 \ m/s[/tex]

    The height is [tex]s = 69 \ m[/tex]

Generally from kinematic equation we have that

    [tex]s = ut + \frac{1}{2} gt^2[/tex]

Here u  is the initial velocity of the turd in the vertical direction and the value is 0 m/s

So

    [tex]69 = 0 * t + \frac{1}{2} * 9.8 t^2[/tex]

=>   [tex]t = \sqrt{\frac{2 * 69}{4.9} }[/tex]

=>   [tex]t = 3.75 \ s[/tex]

Generally the distance which the robot have to  hood the bucket in order to catch the turd  is mathematically represented as

     [tex]d = v_x * t[/tex]

=>  [tex]d = 30 * 3.75[/tex]

=>  [tex]d = 112.5 \ m[/tex]      

Answer:

motion

Explanation:

Answer:

Projectile Motion

Explanation:

A p e x

Answer:

Explanation:

Given

1 ) 140 m west in 45 s .

2 ) 90 m east in 25 s .

a )

distance travelled in first 45 s = 140 m

b ) distance travelled in next 25 s = 90 m

c ) Total distance travelled = 140 m + 90 m

= 230 m

d ) average speed in first 45 s

= distance in 45 s  45

= 140 / 45 = 3.11 m /s

e ) average speed in next 25 s

distance in 25 s / 25

= 90 / 25 = 3.6 m /s

f ) average in entire trip

=  total distance / total time

= (140 + 90) / ( 25 + 45 )

= 3.28 m /s

g )

displacement in first 45 s = 140 m towards west

h )

displacement in next 25 s = 90 m towards east

i )

total displacement = 140 - 90

= 50 m towards west .

Answer:

4.3 g/ cm^3

Explanation:

Mass / Volume = density . so 2150/500= 4.3 g/cm^3

Answer:

It can really give you a new light and sense of your surroundings. With a well meditated mind, you can see things and feel different almost, but mostly same. But basically, with a meditated mind, you're more focused on what you're doing at the moment or what you're about to do.

Explanation:

~Hope this helps! If this wasn't the answer you were looking for, please don't hesitate to comment here or private message me! Have a nice day/night! :)))~

Distance = (30+40+50) = 120 km

It's back where it started, so displacement = zero

The distance traveled by truck is equal to 70 km and its displacement is 50 km.

The distance of an object can be described as the total path traveled by an object. It is a scalar quantity as it has only magnitude, not direction. The distance is always positive, it can never be zero.

The displacement can be described as the shortest distance between two points. The displacement is a vector quantity with both direction and magnitude. The displacement of an object can be positive, negative, or zero and can increase or decrease with time.

Given, a truck moves 30 km along AB in the West as shown in the attached figure below, and then 40 km North along BC.

The distance of the truck will be = AB + BC = 30 + 40 = 70Km

The displacement (AC) can be calculated by using Pythagoras' theorem:

AC² = AB² + BC²

AC² = (30)² + (40)²

AC² = 2500

AC = 50 Km

Therefore, the distance is 70 Km and the displacement of the truck is 50 Km.

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On the way down the ball's velocity is Positive 9.8.

Option A) is the correct answer.

What is velocity:?

This refers to the speed at which an object moves in a given direction. It unit is meters per secocond, m/s.

What is acceleration?

This is the rate of change of velocity with respect to time. The speed and direction of the accelerating object are also very important. It unit is meters per second square, m/s².

What is Gravity?

This is the force that pulls a body toward the center of the earth. This force causes objects to fall freely. This free-falling object has an acceleration of 9.8m/s downward the earth. This is called acceleration gravity.

Learn more about  gravity on

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Answer: force...

Explanation:

Answer:the nail is magnetized by a permanent magnet instead of by a solenoid with an electric current running through it

Explanation:

The permanent magnet magnetizing the nail will differently function like electromagnet, by utilizing the electric current through the iron. Hence, option (B) is correct.

The given problem is based on the concept and fundamentals of magnetization. The term magnetizations means that the density of magnetic dipole moments induced in a magnetic material, when it is placed near a permanent magnet.

Thus, we can conclude that the permanent magnet magnetizing the nail will differently function like electromagnet, by utilizing the electric current through the iron. Hence, option (B) is correct.

Learn more about the magnetization here:

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Answer: The statement that correctly identified the difference between laws and theories is

(LAWS describe phenomena (things happening in nature), while THEORIES explain why phenomena exist.)

Explanation:

LAW in the field of natural sciences is defined as a statement which describes a remarkable event( things happening in nature) after repeated close observations.

Example of law in natural science includes:

--> law of conservation of mass

--> law of conservation of energy

THEORY in the field of natural sciences is the explanation of these remarkable events after repeated observations. This helps in bringing together facts and hypothesis (ideas that can be tested with further scientific observations).

Example of theory includes:

--> kinetic theory of matter

--> Dalton's atomic theory.

Answer:

in short the answer is b

Explanation:

took nthe test

Answer:

9828 coulombs

Explanation:

z = [tex]\sqrt{3x^2 + 3y^2}[/tex]

Relation between the cartesian and polar coordinates

x = r cos ∅

y = r sin ∅

z = [tex]\sqrt{3x^2 + 3y^2}[/tex] = [tex]\sqrt{3r}[/tex]

next we calculate the surface charge density of the cone

б ( r, ∅ ) = xyz^2 = 3r^4 sin∅ cos∅

Charge given as

Q = ∫ б(r,∅ )ds

   = ∫ б(r,∅ ) [tex]\sqrt{1 +( \frac{dz}{dx})^2 + (\frac{dz}{dx} )^2 } dA[/tex]

after integration

Q  = ∫ б(r,∅ ) 2dA

Attached below is the remaining part of the solution

Answer:

7 seconds

Explanation:

[tex]From\ the\ information\ provided, \ we\ know\ that:\\Initial\ velocity\ of\ the\ car=25\ m/s\\Final\ velocity\ of\ the\ car=60\ m/s\\\\Acceleration=5\ m/s^2\\[/tex][tex]As\ we\ know\ that\ , \\Acceleration=\frac{Change\ in\ velocity}{Change\ in\ time} \\a=\frac{v-u}{t} \\Hence,\\t=\frac{v-u}{a} \\Substituting\ u=25,v=60,a=5,\\t=\frac{60-25}{5}\\t=\frac{35}{5}\\t=7\ seconds[/tex]

Answer:

B)

Explanation:

Answer:

A. Repeating an experiment to verify results

Explanation:

A scientific theory may be defined as the theory of science that is a thought out explanation of the observations done in the nature or that happens in the natural world. They are constructed using several scientific methods by observing many facts and hypothesis.

According to the question, repeating of an experiment a number of times and verifying its result may help in improving a scientific theory as if we get the similar result for each experiments, then it confirms the basis of the hypothesis or the facts that are observe in the nature and conclude a scientific theory.

Answer:

b

Explanation:

Answer:

a.) 20.4 h

b.) 3.46 km/h

Explanation:

Given that an English Channel is 35 km wide at its narrowest point, which is where most swimmers attempt to cross north to south from England to France. The current across this portion of the English Channel runs at about 2 km/h east to west.

a.) If a swimmer has a relative velocity to the shore of 3 km/h north to south, The resultant velocity (Vr) will be achieved by using Pythagoras theorem  

Vr = [tex]\sqrt{2^{2} + 3^{2} }[/tex]

Vr = [tex]\sqrt{4 + 9}[/tex]

Vr = [tex]\sqrt{12}[/tex]

Vr = 3.46 m/s

To get how long it take her to cross the 35 km distance, Let us first find acceleration by using third equation of motion.

[tex]V^{2} = U^{2} + 2aS[/tex]

Where U = 0

Substitute all the parameters into the equation

[tex]3.46^{2} = 2 x a x 35[/tex]

11.97 = 70a

a = 11.97/70

a = 0.17 km/h^2

The time can be found by using equation

V = U + at

let U = 0

3.46 = 0.17t

t = 3.46/0.17

t = 20.35h

b. What must be her velocity relative to the water if she has a velocity of 3 km/h north to south relative to the shore?

her velocity relative to the water will be

Vr = [tex]\sqrt{2^{2} + 3^{2} }[/tex]

Vr = [tex]\sqrt{4 + 9}[/tex]

Vr = [tex]\sqrt{12}[/tex]

Vr = 3.46 m/s

Answer: 0.076 m/s

Explanation:

Momentum is conserved:

m v = (m + M) V

(0.111 kg) (55 m/s) = (0.111 kg + 80. kg) V

V = 0.076 m/s

After catching the puck, the goalie slides at 0.076 m/s.

A 0.111 kg hockey puck moving at 55 m/s is caught by a 80 kg goalie at rest. With speed does the goalie slide on the ice is 0.076 m/s

The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.

Momentum is conserved:

m v = (m + M) V

(0.111 kg) (55 m/s) = (0.111 kg + 80. kg) V

V = 0.076 m/s

After catching the puck, the goalie slides at 0.076 m/s.

A 0.111 kg hockey puck moving at 55 m/s is caught by a 80 kg goalie at rest. With speed does the goalie slide on the  ice is 0.076 m/s.

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Answer:

A. pH greater than 7

Explanation:

Because a base has a pH scale of 8 to 14

Answer:

The fireball slows down when moving upward. It speeds up when moving downward. So, its velocity is always changing.

Answer:

The fireball went in the air and slowed down. This is because, the gravity holds us down on earth and if not, we would be floating everywhere. So, the fireball slows down because the gravity is pulling it back down. As well as it's going down, it becomes faster. Just like when we jump, we come down pretty fast. So, when the gravity pulls you down and you go down it starts to pick up speed. Thats just how gravity works.

Explanation:

I put this in my own words.

I hope this helps anyone that needs it! :)

Answer:

radiation heat.

Explanation:

That is any heat that passes through the air, like the sun.

Answer:

radiation

Explanation: I’m sure

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Answer:

a = 10.5 m/s²

Explanation:

In order to find the acceleration of the car we will use the basic definition of the acceleration, that is the rate of change of velocity. So, the definition of the acceleration of the car will be:

a = (Vf - Vi)/t

where,

a = acceleration = ?

Vf = Final Velocity = 45 m/s

Vi = Initial Velocity = 24 m/s

t = time = 2 s

Therefore,

a = (45 m/s - 24 m/s)/2 s

a = 10.5 m/s²

Answer:

B

Explanation:

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