CAN SOMEONE HELP ME PLEASE

Answer:

324.76J

Explanation:

Given parameters:

Force of pull on the box = 25N

Displacement  = 15m

Angle of pull  = 30°  

Unknown:

Work done by the force  = ?

Solution:

Work done is the force applied on a body to move it through a particular distance.

It can be expressed as;

   Work done  = F x dcosФ

F is the force

d is the displacement

Ф is the angle

So;

        Work done  = 25 x 15cos 30  = 324.76J

Answer:

15s

Explanation:

Given parameters:

Distance traveled  = 375m

Speed = 25m/s

Unknown:

Time taken = ?

Solution:

To solve this problem, we make time the subject of the speed equation.

    Speed  = [tex]\frac{distance}{time}[/tex]  

  Time  = [tex]\frac{distance}{speed}[/tex]  

 Now insert the parameters and solve;

  Time  = [tex]\frac{375}{25}[/tex]   = 15s

Answer:

I. Speed = 20m/s

II. Velocity = 20m/s due North.

Explanation:

Given the following data;

Distance = 40m

Time = 2secs

To find the speed;

Mathematically, speed is given by the formula;

[tex]Speed = \frac{distance}{time}[/tex]

Substituting into the equation, we have;

[tex]Speed = \frac{40}{2}[/tex]

Speed = 20m/s.

In physics, we use the same formula for calculating speed and velocity. The only difference is that speed is a scalar quantity and as such has magnitude but no direction while velocity is a vector quantity and as such it has both magnitude and direction.

[tex]Velocity = \frac{distance}{time}[/tex]

Therefore, the velocity is 20m/s due North.

Answer:

473.8miles/hr

Explanation:

Given parameters:

Time of flight  = 4hrs

Distance traveled  = 1895miles

Unknown:

Speed of the plane  = ?

Solution:

Speed is the rate of distance covered per unit of time.

It is expressed as:

        Speed  = [tex]\frac{distance}{time}[/tex]  

So;

  Speed  = [tex]\frac{1895}{4}[/tex]   = 473.8miles/hr

Answer:

Rocket 2 has highest acceleration.

Explanation:

Net force,

F = mass (m) × acceleration (a)

We have,

m₁ = 4.25 kg and F = 120 N

[tex]a_1=\dfrac{F_1}{m_1}\\\\a_1=\dfrac{120}{4.25}\\\\a_1=28.23\ m/s^2[/tex]

m₂ = 3.25 kg, F₂ = 120 N

[tex]a_2=\dfrac{F_2}{m_2}\\\\a_2=\dfrac{120}{3.25}\\\\a_2=36.92\ m/s^2[/tex]

m₃ = 5.5 kg, F₃ = 120 N

[tex]a_3=\dfrac{F_3}{m_3}\\\\a_3=\dfrac{120}{5.5}\\\\a_3=21.81\ m/s^2[/tex]

m₄ = 4.5 kg, F₄ = 120 N

[tex]a_4=\dfrac{F_4}{m_4}\\\\a_4=\dfrac{120}{4.5}\\\\a_4=26.66\ m/s^2[/tex]

Hence, it can be seen that the highest acceleration is of rocket 2.

Answer:

A. The first option: An absorber that is dark in color and rough.

Explanation:

a material absorbs - or transfers the most thermal energy when it is dark in color and rough in texture.

The material that would result in the greatest amount of energy transfer will be an absorber that is dark in color and rough.

A piece of a substance called an absorber is used to absorb a few of the energy of an incoming particle.

Depending on the application, absorbers can be manufactured of a range of materials, including lead, tungsten, and liquid hydrogen.

The majority of absorbers are found in particle detectors, but they are also utilized in particle accelerators to protect their components from radiation damage.

The material that would result in the greatest amount of energy transfer will be an absorber that is dark in color and rough.

Hence option A is correct.

To learn more about the absorber refer to the link;

https://brainly.com/question/23461193

Explanation:

Given parameters:

Jermaine runs exactly 2 laps around a 400m track

Start time  = 3:02:00PM

End time  = 3:04:45PM

Unknown:

Distance traveled  = ?

Speed  = ?

Displacement  = ?

Velocity  = ?

Solution:

To solve this problem, we need to find the distance and time first;

        Distance  = 2 x 400  = 800m

Time taken  = 3:04:45PM  - 3:02:00PM  = 165s

Speed  = [tex]\frac{distance}{time}[/tex]   = [tex]\frac{800}{165 }[/tex]   = 4.85m/s

The velocity of the body is 0m/s and so is the displacement.

This is because the starting and finishing position of the Jermaine is the same.

Answer:

Explanation:

Pliability

Explanation:

Mostly in metamorphic or lava materials is uranium-238 contained. Then no fossil could be estimated utilizing U 238 specifically. They should never be used combined due to the huge variations in the half-life of Carbon 14 with Uranium-238. It is only possible to be using carbon 14 to classify fossil from a very current generation.

Answer:

1800J

Explanation:

Given parameters:

Weight of the book  = 20N

Total distance covered  = 45m + 15m + 30m  = 90m

Unknown:

Total work performed on the books  = ?

Solution:

To solve this problem we must understand that work done is the force applied to move a body through a certain distance.

So;

    Work done  = Force x distance

  Work done  = 20 x 90  = 1800J

Answer:

a) 4

b) 5

c) 2s

d) 10 m/s

e) 5-10m/s^2

want to zøom?

Answer:

See the answer below

Explanation:

The weight of a body is defined as the product of mass by the acceleration gravitation of space or place.

1)

[tex]W=m*g[/tex]

where:

m = mass [kg]

g = gravity acceleration = 9.8 [m/s²]

Therefore:

[tex]m=W/g\\m=62/9.8\\m=6.32[kg][/tex]

2)

The mass remains the same regardless of where the object or body is located. That is, the mass will be equal on Mars and on Earth.

3)

We used the same equation to determine the weight, using the Mars gravity constant.

[tex]W=6.32*3.7\\W=23.4[N][/tex]

Answer:

The net force is 50 Newton

Explanation:

Mechanical Force

According to Newton's second law, the net force exerted by an external agent on an object of mass m is:

F=m.a

Where a is the acceleration produced on the object.  

We are given the mass of the object m=5 kg and its acceleration [tex]a=10\ m/s^2[/tex].

The net force is:

F = 5 * 10

F = 50 N

The net force is 50 Newton

Explanation:

A spring has a spring constant, (k), of 3 N/m. It is stretched until it is extended by 50 cm. Calculate the elastic potential energy stored by the spring, assuming it is not stretched beyond the limit of proportionality.

First convert centimetres to metres:

50 cm = 50 ÷ 100 = 0.5 m

Then calculate using the values in the question:

Ee=12 k e2

Ee=12×3×0.52

Ee=1.5×0.25

Ee=0.375 J

Answer:

53.8

Explanation:

Knowns:

Distance - 1,400

Speed - 52

Unknowns:

Velocity - ?

V = 2([tex]\frac{Distance}{Time}[/tex])

V = 2([tex]\frac{1,400}{52}[/tex])

V = 2(26.9)

V = 53.8

Answer:

When a fluid flows into a narrower channel, its speed increases. That means its kinetic energy also increases. Where does that change in kinetic energy come from? The increased kinetic energy comes from the net work done on the fluid to push it into the channel and the work done on the fluid by the gravitational force, if the fluid changes vertical position. Recall the work-energy theorem,

There is a pressure difference when the channel narrows. This pressure difference results in a net force on the fluid: recall that pressure times area equals force. The net work done increases the fluid’s kinetic energy. As a result, the pressure will drop in a rapidly-moving fluid, whether or not the fluid is confined to a tube.

There are a number of common examples of pressure dropping in rapidly-moving fluids. Shower curtains have a disagreeable habit of bulging into the shower stall when the shower is on. The high-velocity stream of water and air creates a region of lower pressure inside the shower, and standard atmospheric pressure on the other side. The pressure difference results in a net force inward pushing the curtain in. You may also have noticed that when passing a truck on the highway, your car tends to veer toward it. The reason is the same—the high velocity of the air between the car and the truck creates a region of lower pressure, and the vehicles are pushed together by greater pressure on the outside.  This effect was observed as far back as the mid-1800s, when it was found that trains passing in opposite directions tipped precariously toward one another.

Explanation:

The air flowing over a roof top which has a high velocity as compared to that flowing underneath. This is because of the increase in the kinetic energy of the air.

Kinetic energy is the energy which is due to the motion of an object. It is the energy which is present inside the body of an object which is in motion. Kinetic energy undergoes transformation to potential energy when the object comes at rest. The SI unit of Kinetic energy is Joule (J). Kinetic energy is a vector quantity as it has both the magnitude and direction.

When a fluid or other substances such as air flows into a narrower channel, the speed or velocity of the compound increases. This means that the kinetic energy of the substance also increases. This is because, kinetic energy is directly proportional to the velocity of the object.

Learn more about Kinetic energy here:

https://brainly.com/question/26472013

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Answer:

The height of the hill is "31.85 m".

Explanation:

The given value is:

Velocity,

v = 25 m/s

As we know,

⇒ [tex]Kinetic \ energy =Potential \ energy[/tex]

i.e,

⇒ [tex]mgh=\frac{1}{2} mv^2[/tex]

⇒    [tex]gh=\frac{1}{2} v^2[/tex]

⇒      [tex]h=\frac{v^2}{2g}[/tex]

On substituting the given value, we get

⇒      [tex]h=\frac{(25)^2}{2\times 9.81}[/tex]

⇒         [tex]=\frac{625}{19.62}[/tex]

⇒         [tex]=31.85 \ m[/tex]

Given;

We know the relation,

→ [tex]Kinetic \ energy (K.E) = Potential \ energy (P.E)[/tex]

or,

→ [tex]mgh = \frac{1}{2}mv^2[/tex]

or,

→    [tex]gh = \frac{1}{2}v^2[/tex]

         [tex]h = \frac{v^2}{2g}[/tex]

By putting the values, we get

            [tex]= \frac{(25)^2}{2\times 9.81}[/tex]

            [tex]= \frac{625}{19.62}[/tex]

            [tex]= 31.85 \ m[/tex]

Thus the response above is right.

Learn more about velocity here:

https://brainly.com/question/15447166

Answer:

Newton's law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them.

Explanation:

Answer:

42.5mph

Explanation:

The computation of the average speed is shown below:

As we know that

Speed = Distance ÷ Time

ANd, distance = Speed × time

So, the distance would be

= (50 × 5 hours) + (30 × 3)

= 250 + 90

= 340 miles

And, the total time taken is 8 hours

So, the average speed is

= 340 miles ÷ 8 hours

= 42.5mph

Answer:

[tex]64 cm^3[/tex]

Explanation:

Density

The density of a substance is the mass per unit volume. The density varies with temperature and pressure.

The formula to calculate the density of a substance of mass (m) and volume (V) is:

[tex]\displaystyle \rho=\frac{m}{V}[/tex]

We have a cube-shaped piece of copper of 4 cm of side length. The volume of the piece is:

[tex]V=(4\ cm)^3=64\ cm^3[/tex]

Surprisingly, no other magnitude is required, thus the answer is:

[tex]\mathbf{64 cm^3}[/tex]

Answer:

acceleration or velocity

Explanation:

Gamma rays

each section of the electromagnetic spectrum has characteristics energy level, wavelength and frequencies association with it's photons

because earth has lava underneath us all and it makes earthquakes and etc things like that

Try to split the questions for easy access

Answer:

B

Explanation: