A sled that has a mass of 8 kg is pulled at a 50 degree angle with a force of 20 N. The force of friction acting on the sled is 2.4 N. The free-body diagram shows the forces acting on the sled.

What is the acceleration of the sled and the normal force acting on it, to the nearest tenth?

Answer:

H = 1/2 * g * t^2     since initial velocity is zero

v = g * t    where v is the final velocity

t = v / g

H = 1/2 g * v^2 / g^2 = 1/2 v^2 / g

v = (2 * H * g)^1.2

v = (2 * 500 * 9.8)^1/2 = 99 m/s

Check: t = v / g = 99 / 9.8 = 10.1 sec

H = 1/2 * 9.8 * 10.1^2 = 500 m

Answer:

Explanation:

In a velocity/time (aka acceleration) graph, the slope of a line indicates the value of the acceleration in m/s/s. Acceleration is the change in velocity over the change in time. From 0 - 2 seconds, there is no change in velocity, so the acceleration during this interval is 0 (which is the same as the slope of the line). From 2 - 4 seconds, the slope of the line is -2, so the acceleration during the time interval from 2 to 4 seconds is -2 (negative because David is slowing down but is still going the same direction: to the right).

Answer:

3) Act on different objects

Explanation:

Newton's third law of motion states that for every action there is an equal and opposite reaction.

Action-reaction force pairs make it possible for fishes to swim, birds to fly, cars to move, etc.

Basically, action-reaction force pairs are characterized by the following statements;

I. The forces are the same type such as magnetic force, contact force or gravitational force.

II. The forces are equal in magnitude but opposite in direction.

III. They act up on two different bodies.

Hence, the two forces that make up 3rd law of motion can act on different objects.

For example, while driving down the road, a bug strikes the windshield of a vehicle (Action) and makes a quite obvious mess in front of the face of the driver of the vehicle (Reaction) i.e the bug hit the vehicle and the vehicle hits the bug.

Answer:

W = 66 J

Explanation:

Given that,

The weight of the box, W = 44 N

It is placed on a shelf that is 1.5 m above the ground.

We need to find the work done in lifting the box.

We know that,

Work done, W = Fd

So,

W = 44 N × 1.5 m

= 66 J

So, the required work done is equal to 66 J.

Answer:

WHat do you mean by that

Explanation:

I dont get what you re asking

Explanation:

If the satellite is moving too quickly then the gravitational attraction between the Earth and the satellite is too weak to keep it in orbit. If this is the case, the satellite will move off into space. This occurs at speeds around or above 11,200 metres per second (m/s).

Answer:

Push-ups

explanation:

Answer:

the anser for your qestion is

c. push- ups

Answer:

[tex]1) \: \: \: 4Al+ 3MnO _{2}→ 3Mn + 2Al _{2} O _{3} \\ 2) \: \: \:2Ga + 3H _{2}SO _{4} → Ga _{2} (SO _{4}) _{3} +3 H _{2} \\ 3) \: \: \: Mg + 2HCI→ MgCl _{2}+ H _{2}[/tex]

Answer:

The sun is located in the Milky Way Galaxy.

Answer:

If the collector of the cell is covered, the voltage is higher

Explanation:

The collector of the a passive, active, or photovoltaic (PV) solar cell is the device that takes the Sun's energy by the absorption of the Sun's radiation which is then transformed into electricity and heat. The ability to absorb the Sun's energy is given by the material type and the coating of solar collector

Therefore, the device requires access to energy from Sunlight to get the energy which can be stored in a rechargeable cell and well the collector's cell is covered, access to Sunlight is denied and therefore energy is not supplied to the cells and current is not generated and there is no flow of electricity and the voltage in the circuit is lower or there is no voltage in the circuit

The statement which is wrong about the solar cell is therefore, that if the collector of the cell is covered, the voltage is higher

Answer:

A. 59.4

Explanation:

The refractive index of the glass, n₁ = 1.50

The angle of incidence of the light, θ₁ = 35°

The refractive index of air, n₂ = 1.0

Snell's law states that n₁·sin(θ₁) = n₂·sin(θ₂)

Where;

θ₂ = The angle of refraction of the light, which is the angle the light will have when it passes from the glass into the air

Therefore;

θ₂ = arcsin(n₁·sin(θ₁)/n₂)

Plugging in the values of n₁, n₂ and θ₁ gives;

θ₂ = arcsin(1.50 × sin(35°)/1.0) ≈ 59.357551° ≈ 59.4°

The angle the light will have when it passes from the glass into the air, θ₂ ≈ 59.4°.

Answer:

A. 59.4

Explanation:

got it right, trust

Coordinates of y-intercept : (0,3)

Slope = 2

Another coordinate = 2 steps of rise and 1 step of run = (1,5)

Verification

Slope = (3-5) / (0-1) = -2 / -1 = 2

The net displacement of the body is

∆x = (4, 3, 3) m - (-5, 3, 1) m = (9, 0, 2) m

so the work done by F = (3, 0, 4) N in the direction of ∆x is

F • ∆x = (3, 0, 4) • (9, 0, 2) N•m = (27 + 0 + 8) N•m = 35 J

The angle between the force and initial velocity v₀ is θ, such that

F • v₀ = ||F|| ||v₀|| cos(θ)

(3, 0, 4) • (6, 1, 1) N•m/s = √(3² + 0² + 4²) √(6² + 1² + 1²) cos(θ) N•m/s

==>   cos(θ) = (18 + 0 + 4) / (√25 × √38) = 22/(5√38)

==>   θ = arccos(22/(5√38)) ≈ 44.5°

Answer: [tex]3.5\ km[/tex]

Explanation:

Given

Car starts from the state of rest and acquires a velocity of [tex]70\ km/hr[/tex] in 6 minutes

Final velocity in m/s is [tex]v=70\approx 19.44\ m/s[/tex]

Using equation of motion

[tex]v=u+at\\\Rightarrow 19.44=0+a(6\times 60)\\\Rightarrow a=0.054\ m/s^2[/tex]

Distance covered in 360 s

[tex]\Rightarrow v^2-u^2=2as\\\Rightarrow 19.44^2-0=2\times 0.054\times s\\\Rightarrow s=3500.64\ m\approx 3.5\ km[/tex]

Explanation:

I think number has the greater pressure because the molecules are seen tightly packed

Answer:

I think part A) is b because there's more matter(molecules) inside the second so it has more tension

and to part b) I think it would deflated because the air molecules decrease when the temperature does I think.

Answer:

8.89 secs

Explanation:

720m = 1 sec

6400m = ?

6400/720 = 8.89 secs

Answer:

Explanation:

An object in free fall, NOT experiencing parabolic motion, has an equation of

[tex]h(t)=\frac{1}{2} gt^2+h_0[/tex] which says:

The height of an object with respect to time in seconds is equal to the pull of gravity times time-squared plus the height from which it was dropped. Normally we use -9.8 for gravity but you said to use 10, so be it.

For us, h(t) is 5 because we are looking for the height of the window when the object is 5 m off the ground at .5 seconds;

g = 10 m/s/s, and

t = .5sec

[tex]5=\frac{1}{2}(-10)(.5)^2[/tex]+h and

5 = -5(.5)² + h and

5 = -5(.25) + h and

5 = -1.25 + h so

h = 6.25

That's how high the window is above the ground.

Height above the window object was dropped is 6.25 m

Given:

Height of window = 5 m

Time taken to drop object = 0.5 sec

Gravitational acceleration = 10 m/s²

Find:

Height above the window object was dropped

Computation:

We know that;

[tex]H(T) = \frac{1}{2}(g)(t^2) + H(S)\\\\5 = \frac{1}{2}(10)(0.5^2) +H(S)\\\\5 = (5)(0.5^2)+H(S)\\\\H(S) = 6.25[/tex]

So,

Height above the window object was dropped = 6.25 m

Learn more:

https://brainly.com/question/13704950?referrer=searchResults

Answer:

fertilization and it produces a Zygote

Explanation:

Potential energy is the energy occupied by an object or substance due to its position.

For example, a sled drops 20 meters in height on a hill shows that a decrease in height is taking place.

Hence, potential energy is involved there.

Kinetic energy is the energy acquired by an object due to its motion.

For example, a rider is going 20 m/s at the bottom of the hill shows that rider is in motion due to which it has kinetic energy.

Explanation:

everything can be found in the picture

Answer:

[tex]h_{moon} = 11.8\ m[/tex]

Explanation:

Since the work done is same everywhere in the universe. Hence, the work done in jumping will be same for the person on moon and earth:

[tex]W_{moon} = W_{earth}\\\\P.E_{moon} = P.E_{earth}\\\\mg_{moon}h_{moon} = mg_{earth}h_{earth}\\\\g_{moon}h_{moon} = g_{earth}h_{earth}\\\\(1.66\ m/s^2)h_{moon} = (9.8\ m/s^2)(2\ m)\\\\h_{moon} = \frac{(9.8\ m/s^2)(2\ m)}{1.66\ m/s^2}\\\\h_{moon} = 11.8\ m[/tex]

Answer:

I)  the correct one is A

II)  the alternatives C

III) corresponds to option D

IV)  alternative B

Explanation:

Various information can be obtained from the speed versus time graphs

* If the graph is an inclined line, the speed is constant

* if the graph is a horizontal line the velocity is zero

In this case, the first graph (I) has two parts: an inclined line that corresponds to a uniform movement with speed and a second one, so that it is a horizontal line that indicates that the body is stopped.

If we see the different alternatives, the correct one is A

The second graph (II) has a movement with constant speed second period of being stopped

This graph corresponds to the alternatives C

The third graph (III) the body moves at constant speed without stopping

This corresponds to option D

The fourth graph (IV) the body moves with a slow speed and after 40 s it stops

This graph is associated with alternative B

Answer:

Energy is what makes change happen and can be transferred form one object to another. Energy can also be transformed from one form to another. Power is the rate at which energy is transferred. It is not energy but is often confused with energy.

Explanation:

Answer:

when u have energy u will have power n u can work as power is the capacity to do the work

Answer:

Los 11 colores básicos (negro, azul, marrón, gris, verde, naranja, rosa, púrpura, rojo, blanco y amarillo) y los 28 adicionales (turquesa, verde oliva, verde menta, borgoña, lavanda, magenta, salmón, cian, beige, rosado, verde oscuro, verde oliva, lila, amarillo pálido, fucsia, mostaza, ocre, trullo, malva, púrpura

hope that helps bby<3

Answer:

10 millones

Explanation:

En primer lugar, los científicos han determinado que en el laboratorio podemos ver unos 1.000 niveles de luz oscura y unos 100 niveles de rojo-verde y amarillo-azul. Eso es alrededor de 10 millones de colores ahí mismo.

Explanation:

I think a) Waste product and b) 80%

Answer:

oxygen is used up is the answer

Explanation:

These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapor (H2O) and carbon dioxide (CO2).