Joel the firefighter, standing 45 m from a burning building, directs a stream of water from a ground level fire hose at an angle of 25 degrees above the horizontal. The Vi of the stream as it leaves the hose is 55 m/s. What is the water’s Vix?

Answer:

Mr. Turner will not be able to stop in time.

a = - 71.2 m/s²

s₁ = 11.67 m

Explanation:

Since, Mr. Turner is driving at 45.56 m/s and his reaction time for applying brakes is 3/4th of a second. So, the distance covered by car in this time will be:

s₁ = vt

where,

s₁ = distance covered by car before applying brakes = ?

v = speed of car = 15.56 m/s

t = reaction time = 3/4th of second = 0.75 s

Therefore,

s₁ = (15.56 m/s)(0.75 s)

s₁ = 11.67 m

and the distance required for the car to stop after applying brakes is:

s₂ = 1.7 m

So, the total distance traveled by car before stopping will be:

s = s₁ + s₂

s = 11.67 m 1.7 m

s =  13.37 m

since, the driver was 13.3 m ahead.

Therefore, Mr. Turner will not be able to stop in time.

To find the deceleration of Mr. Turner after applying brakes we use 3rd equation of motion:

2as₂ = Vf² - Vi²

where,

a = deceleration = ?

Vf = Final Velocity = 0 m/s

Vi = Initial velocity = 15.56 m/s

Therefore,

2a(1.7 m) = (0 m/s)² - (15.56 m/s)²

a = - (242.1136 m²/s²)/3.4 m

a = - 71.2 m/s²

Because mercury freeze in cold temperatures

Answer:

the total kinetic and potential energy of its particles

Explanation:

In every object, there are two types of energy which can be found inside them-Kinetic and Potential Energy. For example, a solid object placed on a stationary table has a potential energy due to the vibration of the molecules of the object.

As the object is moved across the table, it has kinetic energy. The combination of both energy is known as thermal energy. An increase in both energy leads to increase in the thermal energy of a given object.

Answer:

The gravitational force between two objects is written as:

F = G*m1*m2/r^2

Where:

G = 6.67*10^(-11) m^3/kg*s

m1 and m2 are the masses of the objects.

r is the distance between the objects.

In this case, we know that:

F = 0.0005 N

r = 10m

and because the two spheres are identical, we have that:

m1 = m2 = M

then we have the equation:

0.0005 N = (6.67*10^(-11) m^3/kg*s)*(M^2/(10m)^2)

0.0005 N*(10m)^2/(6.67*10^(-11) m^3/kg*s) = M^2

√( 0.0005 N*(10m)^2/(6.67*10^(-11) m^3/kg*s) ) = M = 27,379.3 kg

The mass of each sphere is 27,379.3 kg

Answer:

respiratory = nose

circulatory = heart

digestive = mouth

nervous = brain

Answer: Does this help???

The centripetal force is required.

The centripetal force is 243.47 N.

m = Mass of runner = 78.6 kg

v = Velocity of runner = 8.8 m/s

r = Radius = 25 m

Centripetal force is given by

[tex]F_c=\dfrac{mv^2}{r}\\\Rightarrow F_c=\dfrac{78.6\times 8.8^2}{25}\\\Rightarrow F_c=243.47\ \text{N}[/tex]

The centripetal force is 243.47 N.

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Answer:

V = 2500V

Explanation:

Given the following data;

Current = 0.5A

Resistance = 5K ohms = 5*10³ = 5000 ohms

To find the voltage;

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

[tex] V = IR[/tex]

Where;

Substituting into the equation, we have;

[tex] V = 0.5 * 5000 [/tex]

V = 2500 V.

Therefore, the voltage needed to pass the current is 2500 volts.

Answer:

I think the right answer is A

Answer:

Shooting guard I think

Explanation:

Answer:

the center

Explanation:

i had it on my test

Answer:

it started to move a 1 second

Answer:

at one second :p

Explanation:

Answer:

mass and speed

Explanation:

Kinetic energy increases as mass and speed are increased

Answer: question 1 , would be one question 2 , would be 1 joule and number three would be number one and number four would be , power and last one would be, number two

Explanation: sorry if its wrong

Answer:

116g

Explanation:

Given parameters:

Mass of A  = 88g

Mass of B₂  = 28g

Unknown:

Mass of AB produced  = ?

Solution:

The reaction expression is given as:

            2A + B₂ →  2AB

According to the law of conservation of matter "matter is neither created nor destroyed but changed from one form to another".

  In retrospect;

      Mass of A + Mass of B₂  =  Mass of AB

  Now insert the parameters and solve;

  Mass of AB  = 88g + 28g  = 116g

Answer: 10.05m/s²

Explanation:

Force acting on the plane has a magnitude of 1900N.

Mass of plane = 860kg

We then calculate the acceleration which will be:

= 1900 / 860

= 2.21 m/s²

Since acceleration due to gravity is equal to 9.8m/s², then the net acceleration will be:

= ✓(2.21² + 9.8²)

= ✓(4.88 + 96.04)

=✓100.92

= 10.05m/s²

Explanation:

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yes the answer is force

Explanation:

Force is a push or pull which can change the state of body whether it is rest or in motion or tries to change the state of body.

Answer:

B

Explanation:

Since

K.E = 1/2 mv^2

P.E = mgh

Answer:

It depends on

1 The energy of the body

2 Motion

Explanation:

✌♥️✌♥️

The speed of the wave is 14.4 m/s.

Speed is the rate of change of distance.

To calculate the speed of the wave, we apply the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the speed of the wave is 14.4 m/s.

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Answer:

looks like law of inertia

Explanation:

Answer:

The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. Newton's first law of motion is often stated as. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

no clue what the question is but pop off i guess

Answer: (from top to bottom)

350 N, 80 kg, 10 m/s^2, 80 kg, -15 m/s^2, -3000 N

Explanation:

Force = Mass*Acceleration (aka F = ma)

Using algebra, you can find the variables/unknown values.

Answer:

Explanation:

Time taken by sound to come back to surface after reflection from trench

= distance travelled / speed of sound

= 2 x 11000 / 1500

= 14.66 s

In one way , sound will take half the time = 7.33 s .

Answer:

moon by earth is 1.62/s and squre in mathematical terms and earth by moon is the same answer

Compared to the earth, which has a mass of 5.97 into 10 to the power of 24 kilograms, the moon has a mass of 7.35 into 10 to the power of 22 kilograms. The moon is 3.84 into 10 to the power 8 meters away from the earth, but this is from the center, where the earth cannot see it. We have to judge by the moon.

The moon's mass divided by its orbital distance will determine the magnitude of both forces, which will be equal in strength but acting in opposite directions. It is commonplace.

This can be solved within the square as a whole, giving us a result of 19.85 into 10 to the power of 19 newtons. This force will be roughly equivalent to 1.99 into 10 and will have a magnitude of 20 newtons. This will turn out to be the solution to the issue.

The earth will be the moon, and both forces will be moving in the same direction. The force on the moon and the force on earth are the same.

Therefore, The moon's mass is 7.35 into 10 to the power 22, the earth's g square mass is 5.97 into 10 to the power 24, and the r value is 3.84 into 10 to the power 8. Moon by earth is 1.62/s.

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#SPJ2

Answer:

Non- examples will include processes that are not involving earthquakes or tectonic plates movements.

Explanation:

Seismology is the scientific study of earthquakes and internal structure of the earth. This study involves geographical distributions , origins, the effects and possible predictions of earthquakes. Seismology study can further include the  movement of Earth's tectonic plates.

Example of seismology is geological surveying.

Answer:

k = 25.18 N/m

Explanation:

Simple Harmonic Oscillator

It consists of a weight attached to one end of a spring being allowed to move forth and back.

If m is the mass of the weight and k is the constant of the spring, the period of the oscillation is given by:

[tex]\displaystyle T=2\pi {\sqrt {\frac {m}{k}}}[/tex]

If the period is known, we can find the value of the constant by solving for k:

[tex]\displaystyle k=m\left(\frac{2\pi}{T}\right)^2[/tex]

Substituting the given values m=5 Kg and T=2.8 seconds:

[tex]\displaystyle k=5 \left(\frac{2\pi}{2.8}\right)^2[/tex]

k = 25.18 N/m

Answer:

The force will have to increase

Explanation:

Since Juan has upgraded from a sports car to a large truck, based on Newton's second law of motion, the force needed to keep the truck going at the same speed will have to increase.

 According to Newton's second law "the force on an object is equal to the product of its mass and acceleration".

       Force  = mass x acceleration

A truck has a larger mass compared to a sports car.

By virtue of this, to make sure both automobiles attain the same speed, the force powering them to accelerate must be the same.

 Therefore, the force from the engine must increase.

Answer: They both do the same amount of work but Tow A has more power

Explanation: