Your backpack has a mass of 8 kg. You lift it from the ground to a height of
0.7 m. How much work is done by gravity as you lift the backpack?
A. -5.6 J
B. 54.9 J
C. -54.9 J
D. 5.6 J
Will mark brainliest!

Answer:

The ramps length, height, degree, and the weight of the car.

Explanation:

Answer:

I think they need the slope of the ram(degree) .

& current gravitational acceleration

& the length of the ram and also l don't think mass of the cars are not needed becoz the acceleration of the cars are given by its,

Gravitational acceleration * sin( slope).

So then use that in v^2=u^2+2as equation.

s for length

a for acceleration

v for end velocity

u for start velocity

Answer:

B. 45 g because it is the given answer of the division that is given to the equation

Answer:

its z trust me

Explanation:

trust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Answer:

Vx = 3.10 [m/s]

Vy = 11.59 [m/s]

Explanation:

To solve this problem we must decompose the velocity vector by means of the angle on the horizontal.

v = 12 [m/s]

Vx = 12*cos (75) = 3.10 [m/s]

Vy = 12*sin (75) = 11.59 [m/s]

Answer:

No it will not (false)

Explanation:

I say this because if anything the ice will sink and melt from a solid to a liquid and that will lead to i guess more water for the aquatic life. (THIS IS A THEORY SHAWTY)

Answer:

A) Dendrite

B) Soma

C) Axon

D) Myelin Sheath

E) Synapse

Explanation:

EDG 100%

We have that from the options, the  force require to move the table will be the Reaction force.i.e the force that will get a reaction out of the table i.e is Motion

The reaction force on the box

Correct  Option is C

From the question we are told

Lien is pushing a box across a table. She used a force of 100 N to get the box moving

Generally The Force Requird to Move a table is greater than the contiunes force applied to it to en sure it contines in Motion.

Having said that Newtons Third law states for every action there most be an equal and opposite reaction

Therefore

From The options the  force require to move the table will be the Reaction for.that is the force that will get a reaction out of the table i.e is Motion

Correct  Option is C

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Answer:

soi nuevo

Explanation:me  regalan puntos

Answer:

15,200J

Explanation:

The equation is 1/2 x m x v², where m= mass and v= velocity.

Answer:

4 miles per hour

Explanation:

Your welcome

Answer:

polar-molecule

Explanation:

Answer:

B) 30 mph northwest

Explanation: Vector quantities have both direction and magnitude. In this case the direction is northwest, and magnitude is 30 mph.

The following is a vector quantity, 30 mph northwest. Option B is correct.

A vector quantity is a physical quantity that has both magnitude and direction. Examples of vector quantities include displacement, velocity, acceleration, force, and momentum.

In contrast, a scalar quantity is a physical quantity that has only magnitude and no direction associated with it. Examples of scalar quantities include speed, distance, mass, temperature, and time.

Here,
A vector quantity is a physical quantity that has both magnitude and direction. In this case, the magnitude is 30 mph and the direction is northwest, which makes it a vector quantity.

Option A is a scalar quantity because it only has a magnitude, but no direction associated with it. Option C is also a vector quantity because it has both magnitude and direction, but it is not given a direction in the question. Option D is a scalar quantity because it only has a magnitude.

Thus, the following is a vector quantity, 30 mph northwest. Option B is correct.

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Answer

:Fold mountains are often associated with continental crust. They are created at convergent plate boundaries, sometimes called continental collision zones or compression zones. Convergent plate boundaries are sites of collisions, where tectonic plates crash into each other.

Answer:

(A). The horizontal initial velocity is 25 m/s.

(B).  The vertical initial velocity is 43.3 m/s.

(C). The velocity component is

[tex]u_{x}=u\cos\theta[/tex]

[tex]u_{y}=u\sin\theta[/tex]

Explanation:

Given that,

Initial velocity = 50.0 m/s

Angle = 60°

We need to calculate the component of velocity

Using formula of component

(A). Horizontal initial velocity

[tex]\cos\theta=\dfrac{u_{x}}{u}[/tex]

Put the value in to the formula

[tex]\cos60=\dfrac{u_{x}}{50}[/tex]

[tex]u_{x}=50\times\cos60[/tex]

[tex]u_{x}=25\ m/s[/tex]

(B). Vertical initial velocity

[tex]\sin\theta=\dfrac{u_{y}}{u}[/tex]

Put the value in to the formula

[tex]\sin60=\dfrac{u_{y}}{50}[/tex]

[tex]u_{y}=50\times\sin60[/tex]

[tex]u_{y}=43.3\ m/s[/tex]

The velocity component is

[tex]u_{x}=u\cos\theta[/tex]

[tex]u_{y}=u\sin\theta[/tex]

Hence, (A). The horizontal initial velocity is 25 m/s.

(B).  The vertical initial velocity is 43.3 m/s.

(C). The velocity component is

[tex]u_{x}=u\cos\theta[/tex]

[tex]u_{y}=u\sin\theta[/tex]

Answer:

First Quarter

Explanation:

Answer:

net force

Explanation:

The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.

Answer:

a

Explanation:

Answer:

Explanation:

a) Using the equation of motion

S = ut + 1/2gt²

S is the distance of fall

g is the acceleration due to gravity

t is the time taken

Given S = 12.0m, g = 9.81m/s^2, un= 0m/s

12 = 0+1/2(9.81)t²

12 = 4.905t²²²

t² = 12/4.905

t² = 2.446

t = √2.446

t = 1.56secs

b) To determine how fast is the frog falling at this point, we need to calculate the speed of the frog. Using the equaton v = u+gt

v = 0+9.81(1.56)

v = 15.34m/s

Hence the frog is falling at the rate of 15.34m/s

Explanation:

A vertical column of elements in the periodic table is called a group

A horizontal row of elements in the periodic table is called a period

Atoms of elements in the same group have the same number of valence electrons

As you move from left to right on the periodic table, the atomic number increases

Answer: the first one is group

2. Period

3. Number of valence elections

4. increases

Answer:

D. 1×10⁻⁸ M

Explanation:

[H⁺] [OH⁻] = 10⁻¹⁴

(1×10⁻⁶) [OH⁻] = 10⁻¹⁴

[OH⁻] = 1×10⁻⁸

The concentration of hydroxyl ion will be  [tex]10^{-8}[/tex]M.

The amount of a chemical substance in a mixture is expressed by the substance's concentration.

Calculation of concentration.

Given data:

Concentration of H+ =  1 x [tex]10^{-6}[/tex] M.

It is known that,

[[tex]H^{+}[/tex]][[tex]OH^{-}[/tex]] = [tex]10^{-14}[/tex]M

Now, put the value of concentration of [[tex]H^{+}[/tex]] in above equation.

[1× [tex]10^{-6}[/tex]][[tex]OH^{-}[/tex]] =  [tex]10^{-14}[/tex]M

[[tex]OH^{-}[/tex]]  =   [tex]10^{-14}[/tex] / [1× [tex]10^{-6}[/tex]]M

[[tex]OH^{-}[/tex]]  = [tex]10^{-8}[/tex]M

Therefore, the concentration of hydroxyl ion will be  [tex]10^{-8}[/tex]M.

Hence, the correct answer will be an option (D).

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Because it takes more force to accelerate a mass, and gravity exerts more force on a greater mass.  So every object winds up with the same acceleration.  

And THAT, of course, says that all objects in the same gravity will pick up the same speed in the same time, and fall the same distance in the same time.

Explanation:

Because they change the direction of force and multiply the effort.

They increase the rate of doing work.

So, MA of first class lever can be one or greater than one or less than one

Explanation:

(a) What is the maximum height the arrow will attain?

Given:

v₀ᵧ = 54 sin 27.0° m/s = 24.5 m/s

vᵧ = 0 m/s

aᵧ = -9.8 m/s²

Find: Δy

vᵧ² = v₀ᵧ² + 2aᵧΔy

(0 m/s)² = (24.5 m/s)² + 2 (-9.8 m/s²) Δy

Δy = 30.7 m

(b) The target is at the height from which the arrow was shot. How far away is it?

Given:

Δy = 0 m

v₀ᵧ = 54 sin 27.0° m/s = 24.5 m/s

aᵧ = -9.8 m/s²

Find: t

Δy = v₀ᵧ t + ½ aᵧt²

0 m = (24.5 m/s) t + ½ (-9.8 m/s²) t²

t = 5.00 s

Given:

v₀ₓ = 54 cos 27.0° m/s = 48.1 m/s

aₓ = 0 m/s²

t = 5.00 s

Find: Δx

Δx = v₀ₓ t + ½ aₓt²

Δx = (48.1 m/s) (5.00 s) + ½ (0 m/s²) (5.00 s)²

Δx = 241 m

Answer:

1. Solid, liquid, gas, plasma

3. latent heat of vaporization

4. melting

6. heat

7. amount of heat transferred when 1g of a substance melts or freezes

Answer:

1. Solid, liquid, gas, plasma

2.  In a solid and liquid, the particles are close together. In a solid, the particles are packed close together and are held in a fixed position. ... In liquids, particles are usually almost as close to each other as in solids.

3. latent heat of vaporization

4. melting

5. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid.

6. heat

7. amount of heat transferred when 1g of a substance melts or freezes

Explanation:

Textbook online

Answer:

8.042m

Explanation:

Ep = mgh

given that ,

m = 110.8kg

h =?

g = 9.81 m/s^2

Ep= 8741J

8741= 110.8 × 9.81 × h

h= 8741 ÷ ( 110.8 × 9.81 )

h = 8.042m

Answer:

the net force is 10 and it is pushing to the right

Explanation:

The net force is the total and sonce the 20N is overpowering the 10N it will have 10N which will put the 20N ahead

Answer:

We know that:

Distance between Odysseus and Penelope = 50m

Speed of Odysseus = So = 4m/s

Speed of Penelope = Sp = 6m/s.

Now we want to find the equation of motion for Odysseus.

First, let's find the amount of time that he is moving, we know that when he meets with Penelope, he will stop moving.

Now they weel meet each other when the total distance traveled by both of them is equal to 50m.

Then, recalling that:

Distance = Time*speed.

50m = 4m/s*t + 6m/s*t = 10m/s*t

t = 50m/10m/s = 5s

They will move for 5 seconds.

Now we can write the movement equation for Odysseus as:

p(t) = 4m/s*t + p0 for (0s ≤ t ≤ 5s)

Where p0 is the initial position of Odysseus, and because we can put our coordinate axis where we want, we can define p0 = 0m.

Then the position of Odysseus is:

P(t) = 4m/s*t                    if 0s ≤ t ≤ 5s

P(t) = 4m/s*5s = 20m     if t > 5s.

The second piece says that for t larger than 5 seconds, he will not move (at least for a given amount of time)