Um caminhão de entregas transporta produtos de tamanho e peso elevados, o que requer o uso de máquina simples para facilitar a descarga (observe a figura abaixo).

Que máquina simples é representada por essa figura?

(A) Roldanas.

(B) Alavancas.

(C) Rodas e eixos.

(D) Plano inclinado.

Answer:

Power is 3000 W

Explanation:

Momentum = mass × velocity

[tex]300 = 20 \times v \\ velocity = 15 \: {ms}^{ - 1} [/tex]

For power:

[tex]P = \frac{force \times distance}{time} \\ \\ P = force \times ( \frac{distance}{time} )[/tex]

but distance/time is velocity, so:

[tex]P = force \times velocity[/tex]

but force = mass × acceleration:

[tex]P = (mass \times acceleration) \times velocity \\ P = (20 \times 10) \times 15 \\ P = 3000 \: \: watts[/tex]

[ taken acceleration to be 10 m/s² ]

Answer:

car D

Explanation:

1) before to compare all the values of the velocities, they must be in the same units of measurement. It means:

for car A: V=60km / 1h=60km/h;

for car B: V=30km / 0.5h=60km/h;

for car C: V=20km / 0.25h=80km/h;

for car D: V=10km / (7/60)h≈85.7km/h.

2) according to the values calculated in item 1 the car D had the highest velocity.

Answer:

Below

Explanation:

We can use this formula to find the velocity of an object

     velocity = displacement / change in time

*note I converted all distances to meters and all times to seconds, its not necessary though**

CarAvelocity = 60,000 m / 3600 sec

                      = 16.66667 m/s

CarBvelocity = 30,000 m / 1800 sec

                     = 16.66667 m/s

CarCvelocity = 20,000 m / 900 sec

                      = 22.2222 m/s

CarDvelocity = 10,000 m / 420 sec

                      = 23.80952 m/s

Therefor, car D has the highest velocity

Hope this helps!

Answer:

jjjjjjhshahshhddhdhh

Answer:

An object in a motion when it is continuously changing its position based on a reference point and observed by a person or a device.

distance= speed*time

distance=65*7=455km

Explanation:

Time= Distance÷Velocity

Time= 1800÷90

Time= 20 hr

20×60= 1200 min

Explanation:

Distance travelled = Area under the line

= ut + ½ (v-u)t

Acceleration (a) = (v-u)/t and so (v-u) = at

Therefore,

Distance travelled (s) = ut + ½ (v-u)t = ut + ½ (at)t = ut + ½ at²

Thus,proved.

Answer:

Wagon weight 366.41314(9.81) = 3,594.5129 = 3590 N

Load weight 349.9245(9.81) = 3,432.75982 = 3430 N

Explanation:

Let's assume the surface and the applied force are horizontal.

At constant motion, the friction force must balance the applied force

(from F = ma)

Ff = 77.3

μΝ = 77.3

μmg = 77.3

m = 77.3 / (0.011(9.81))

m = 716.3376... kg

Let M be the mass of the wagon

M + 0.955M = 716.3376

M(1.955) = 716.3376

M = 366.41314...kg

0.955 M = 349.9245... kg

round to the three significant digits of the question numerals.

Answer:

Explanation:

Did this come with a Picture?

Answer:

Newton's second law of motion states that the acceleration ( a) experienced by an object is directly proportional to the net force ( Fnet) experienced by the object and inversely proportional to the mass of the object. In equation form, it could be said that a = Fnet/m. The net force is the vector sum of all the individual force values.

Explanation:

The mass of a body is a measure of its inertial property or how much matter it contains.

Body mass index (BMI) is a measure of body fat based on height and weight that applies to both adult men and adult women. To determine BMI, weight in kilograms is divided by height in meters, squared

Mass is both a property of a physical body and a measure of its resistance to acceleration (rate of change of velocity with respect to time) when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies.

Mass is measured in kilogram.

To measure mass, we usually use a balance. In the lab, mass may be measured with a triple beam balance or an electronic balance. But an old fashioned beam balance gives the most accurate value.

Answer:

5.3Km/hr

Explanation:

Velocity=Displacement/Time

D=4km;T=0.75hr

V=4/0.75=5.33..

John traveled at a speed of 5.3 km/h to get to his grandmother's house.

While velocity is the rate of change of an object's position with respect to time in a specific direction, speed is the rate of change of an object's position with respect to time overall. The speed of an item moving in a certain direction is referred to as its velocity. When there is a change in speed, direction, or both, the velocity also changes.

Given:

Time taken to travel, t = 0.75 h

Total distance travelled = 4 km

Let's imagine that John traveled to his grandmother's house in a single direction at a constant pace.

Velocity = Distance travelled in a given direction/Time

So, Velocity = 4 km/0.75 h = 5.3 ≈ 5km/h

John's speed in getting to his grandmother's residence was thus 5 km/h.

Learn more about the Velocity with the help of the given link:

https://brainly.com/question/19979064

#SPJ2

Answer:

[tex]thank \: you[/tex]

Answer:

in 1 second 3m, in 2 seconds 6m, in 3 seconds 9m.

Explanation:

distance=speed × time

Answer:

because in vertical slope force of gravity is more than compared to slanted slope

Answer:

because gravity is always pulling objects down so when you climb upward gravity weighs you down, you have to use effort to move yourself in the opposite direction that gravity is pulling you that is why it is harder to climb up a slope.

Explanation:

The value of mass of a body is not same everywhere.

Because it depends on gravity and the gravity isn't same at every places.

Answer:

Mass is the quantity of matter contained in a body, while weight is the force by which the body is pulled to the earth's center. Mass is an intrinsic property of a body, as it remains the same everywhere in the universe. Weight is variable due to change in the magnitude of the gravitational force applied by the earth.

K1Answer:

s= 6.5cm

Explanation:

Point 1: just right before the block leaves the spring

Point 2: the block has v2=0 (stops moving)

Apply Kinetic-Work Theorem:

K1 + U1 + Wother = K2 + U2

K1=0

U1= 1/2×k×x² (k= 1.81e+3 N/m and x= -0.172 m)

Wother = F×s= 1.79×s

K2=0

U2=0

=> s= 6.5cm

This is my attempt to solve. Let me know if this isn't right

Answer:

A to the left increases and decreases

Answer:

50µs

Explanation:

The conversion is that 1 second equals 1,000,000 micro seconds. Since we have 0.00005 seconds, we will multiply that to a million.

0.00005 * 1,000,000 = 50µs

Keep in mind that 50 only has 1 significant figure because any trailing zeroes before the decimal point do NOT count.

Best of Luck!

0.00005 seconds = 50 μs

Thank you

Answer:

Due to interia of motion

Answer:

i think the answer was

B.Salmonella on dog food

The cause of the illness was Salmonella on dog food, therefore the correct answer is option B.

Science is the methodical, empirically-based pursuit and application of knowledge and understanding of the natural and social worlds.

As stated in the article, the dog food manufacturing facility was shut down while the situation was looked into.

Four times in the preceding five months, the pet food manufacturer had to recall food that was produced at the same factory.

The business said in a statement after reopening the facility that it has taken steps to address the issues caused by Salmonella in dog food.

Thus, the cause of the illness was Salmonella on dog food, therefore the correct answer is option B.

Learn more about the science here,

https://brainly.com/question/18186842

#SPJ2

Explanation:

s.i unit of force is kgm/s²

dimensions of force is ML/T²

s.i unit of power kgm²/s³

dimension of power is ML²/T³

s.i unit of volume is m³

the dimension of volume is L³

Answer:

downwards bro now dodododododdodo

Answer:

[tex]vertically \: downward \\ to \: the \: cenre \: of \: earth \\ thank \: you[/tex]

Answer:

the modern particle theory of matter was accepted in the mid-ninteenth century. Aistotle's continoues theory of matter was overturned. They gave matter order and determine many of its properties. your welcome :)

Answer:

19.284

or

9.33

Explanation:

Answer:

1.66

Explanation:

Found answer on chegg. Works for acellus

la respuesta es 459.183673 kg s2 / m

Answer:

44,100 N

Explanation:

4500(9.8) = 44,100

Answer:

9 times more kinetic energy

Explanation:

KE₀ = ½mv²

KE₁ = ½m(3v)² = 9(½mv²) = 9KE₀

Answer:

fundamental quanties are mass , time, length, temperature , amount of substance and luminous intensity. All other physical quantity are derived quantity and be made from fundamental quanties.

Explanation:

hope it helps u

Answer:

The other person answered

Explanation:

Answer:

25 W bulb will fuse.

The voltages will divide their ratios between the bulbs if we were to connect them.