PLZ HELP DUE IN 5MINUTES

Answer:

t = 3.25 seconds.

Explanation:

A person throws a baseball from a height of 7 feet with an initial vertical velocity of 50 feet per second is given by :

[tex]h=-16t^2+vt+h_0[/tex]

[tex]h=-16t^2+50t+7[/tex]

We need to find the amount of time the baseball is in the air before it hits the ground. ATQ,

h = 0

[tex]-16t^2+50t+7=0\\\\t=\dfrac{-50 \pm \sqrt{50^2-4\times (-16)(7)} }{2(-16)}\\\\t=\dfrac{-50 + \sqrt{50^2-4\times (-16)(7)} }{2(-16)}, \dfrac{-50- \sqrt{50^2-4\times (-16)(7)} }{2(-16)}\\\\t=-0.134\ s,3.25\ s[/tex]

Neglecting negative value, t = 3.25 s

So, the baseball will hit the ground at t = 3.25 seconds.

Answer:

The correct option is;

C. The temperature of the air affects the speed of sound

Explanation:

The information given are;

The speed with which sound travels in the desert air = 358 m/s

The speed with which sound travels in the polar air = 330 m/s

The major difference between the desert air and the polar air is that the temperature of the desert air is hotter than the temperature of the air in the polar region. Therefore the speed of sound is affected by the air temperature.

The equation that gives the relationship of the speed of sound in air, [tex]v_{air}[/tex], to temperature is presented as follows;

[tex]v_{air} = 331\frac{m}{s} \times \sqrt{\dfrac{T_K}{273 K} } = 331\frac{m}{s} \times \sqrt{1 + \dfrac{T_{^{\circ}C}}{273 ^{\circ} C} }[/tex]

Which shows that the speed of sound in air, [tex]v_{air}[/tex], rises as the temperature of the air rises.

Where;

[tex]T_{^{\circ}C}[/tex] = The temperature of the air in degrees Celsius

[tex]T_K[/tex] = The temperature of the air in degrees Kelvin.

Answer:

The impulse on the block due to force of gravity is 235.2 N.s

Explanation:

Given;

mass of the block, m = 3 kg

time of force of gravity action on the block, t = 8 s

Force of gravity on the block is given as;

F = mg

where;

m is mass of the block

g is acceleration due to gravity = 9.8 m/s²

F is the force of gravity

Substitute the given values and calculate F

F = mg

F = 3 x 9.8

F = 29.4 N

The Impulse on the block is given by;

J = Ft

J = 29.4 N x 8 s

J = 235.2 N.s

Therefore, the impulse on the block due to force of gravity is 235.2 N.s

Answer:

The solar wind is created by the outward expansion of plasma (a collection of charged particles) from the Sun's corona (outermost atmosphere). This plasma is continually heated to the point that the Sun's gravity can't hold it down. It then travels along the Sun's magnetic field lines that extend radially outward.

Answer:

The options are not shown, so let's derive the relationship.

For an object that is at a height H above the ground, and is not moving, the potential energy will be:

U = m*g*H

where m is the mass of the object, and g is the gravitational acceleration.

Now, the kinetic energy of an object can be written as:

K = (1/2)*m*v^2

where v is the velocity.

Now, when we drop the object, the potential energy begins to transform into kinetic energy, and by the conservation of the energy, by the moment that H is equal to zero (So the potential energy is zero) all the initial potential energy must now be converted into kinetic energy.

Uinitial = Kfinal.

m*g*H = (1/2)*m*v^2

v^2 = 2*g*H

v = √(2*g*H)

So we expressed the final velocity (the velocity at which the object impacts the ground) in terms of the height, H.

Answer:

(a) Ascend at 0.8 vertical meter/meter

(b) Descend at -0.2·√2 vertical meter/meter

(c) In the (-0.6, -0.8) direction. The path begins at 45° to the horizontal

Explanation:

The given equation of the shape of the hill is z = 2000 - 0.005·x² - 0.01·y²

The current location = (60, 40, 1966)  

The direction of the positive x-axis = east

The direction of the positive y-axis = north

(a) Walking due south = Reducing the y-value 40

From the equation, the elevation varies inversely with the motion towards the north

Therefore, walking south increases the elevation, and we ascend

The rate is given by the partial derivative at in the -j direction, which is 0.02

The rate is therefore 40 × 0.02 = 0.8

(b)The unit vector in the northwest direction u = 1/√2·(-1, 1)

∴ The rate = (-0.01(60), -0.02(40))·u = (-0.6, -0.8)·1/√2·(-1, 1) = -0.2·√2

Therefore we descend

(c) The slope is largest in the grad of the function at the point (60, 40) which is given as follows;

d(2000 - 0.005·x² - 0.01·y² )/dx, d(2000 - 0.005·x² - 0.01·y² )/dy = (-0.6, -0.8)

Therefore, the direction is tan⁻¹(-0.8/-0.6) ≈ S 36.87° W

The slope =(√((-0.4)² + (-0.8)²) = 1

Therefore, the angle is 45° to the horizontal.

Answer:

A) basic units of matter

B) Protons, neutrons, electrons

C) In the nucleus

D) In the nucleus

E) Outside of the nucleus

Explanation:

Answer:

A-Atoms are the basic units of matter and the defining structure of elements.

B-Atoms are composed mainly of protons, neutrons, and electrons.

C and D-Protons and neutrons are found in the nucleus.

E-outside nucleus=eletron location,

Electrical charge is a fundamental aspect of matter. It has two different types called positive and negative (these are just conventional names, there’s nothing special about being positively charged vs. negatively charged). It has the peculiar property where like charges (two positive or two negative) will repel each other while two opposed charges (one each of positive and negative) will attract each other.

Hope this helps!

Answer:ghjkdfrtghjExplanation:

Answer:

F = 294.3 [N]

Explanation:

To solve this problem we must use Newton's second law which tells us that force is equal to the product of mass by acceleration. It is this particular case the acceleration is due to the gravitational acceleration since the body is in free fall.

Therefore we have:

F = m*g

where:

F  = force [N]

m = mass = 30 [kg]

g = gravity acceleration = 9.81 [m/s^2]

F = 30*9.81

F = 294.3 [N]

Answer:

25m/s

Explanation:

200m/ 8s =25m/s

Answer:

UR ANSWER IS WAVELENGTH

Answer:

The number of turns is  [tex]N  = 1750 \ turns [/tex]

Explanation:

From the question we are told that

  The inner radius is [tex]r_i =  12.0 \  cm  =  0.12 \  m[/tex]

   The outer radius is  [tex]r_o =  15.0 \  cm  =  0.15 \  m[/tex]

   The current it carries is [tex]I =  1.50 \  A[/tex]

    The magnetic field is  [tex]B  =   3.75 mT = 3.75 *10^{-3} \  T[/tex]

   The distance from the center is [tex]d =  14.0 \ cm  =  0.14 \  m[/tex]

Generally the number of turns is mathematically represented as

    [tex]N  =  \frac{2 *  \pi  * d  *  B}{ \mu_o *  r_o }[/tex]

Generally  [tex]\mu_o[/tex] is the permeability of free space with value  

    [tex]\mu_o  =  4\pi * 10^{-7} \ N/A^2[/tex]

So

  [tex]N  =  \frac{2 *  3.142   * 0.14 *  3.75 *10^{-3} }{ 4\pi * 10^{-7}  * 0.15  }[/tex]

  [tex]N  = 1750 \ turns [/tex]

answer:

in 18 years there are 9,467280 minutes

hope this helped! <3 i answered your question & hope you have a great day! if you wouldn't mind could you pls give me brainliest? (im trying to level up) thanks! :)

Answer:

162

Explanation:

When the amplitude of the wave is 8 units, the corresponding energy of the wave is 128 units. Therefore, option C is correct.

The term amplitude is defined as the maximum distance moved by a point on a vibrating body or wave calculated from its equilibrium position.

We have given,

first amplitude, A = 1, corresponding energy = 2

second amplitude, A = 2, corresponding energy = 8

The energy of a string at  a given amplitude is calculated as follows;

E ∝ A²

Energy varies as the square of the change in amplitude.

If amplitude of one has energy of two

Amplitude of 2 (double of 1)

= ( 2 x 2 ) = 4 x 2

= 8  4 times the energy at amplitude of 1.

Then for 8 units of amplitude change

8 x 8 = 64 x 2

= 128  

Thus, When the amplitude of the wave is 8 units, the corresponding energy of the wave is 128 units, option C is correct.

To learn more about an amplitude, follow the link;

https://brainly.com/question/15930409

#SPJ2

Your question is incomplete, most probably your question was

The data table shows how the amplitude of a mechanical wave varies with the energy it carries. Analyze the data to identify the mathematical relationship between amplitude and energy. Use your equation to find the energy if the amplitude is 8 units.

Amplitude

1

2

3

4

energy

2

8

18

32

A.66 units

B. 108 units

C. 128 units

D. 88 units ​

Answer:

Explanation:

The force acting on the object can be found by using the formula

[tex]f = \frac{w}{d} \\ [/tex]

where

d is the distance

w is the work done

We have

[tex]f = \frac{3600}{45} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Tech B is correct.

Explanation:

The voltage drop between the two terminals of a circuit is the measurement of the potential difference between the two terminals.

If [tex]v_1[/tex] and [tex]v_2[/tex] ( assuming [tex]v_1 > v_2[/tex]) are potentials at terminal 1 and terminal 2 of the given open circuit.

According to A, the measurement of the potential drop is 12 volts, i.e

The measurement of potential difference [tex]=v_1 -v_2[/tex]

= 12 volts which is correct.

But according to B, a measurement of 12 volts means there are 12 volts on each side of the switch ([tex]v_1= 12[/tex] volts and [tex]v_2=12[/tex] volts), i.e

According to the claim of B, the potential difference (or drop) across the terminals is

[tex]v_1-v_2= 12-12=0[/tex] but the measured potential drop is 12 volts, so B is wrong.

Hence, Tech B is correct.

Answer:

A

Explanation:

the air is the medium man

Answer:

the desk

Explanation:

Answer:

160,934.4 cm or in other words *160,934*

Explanation:

1 mile = 5280 ft.

5280 ft. = 63360 in.

63360 in. = 160934.4

Explanation:

80*24=1920 or 1,920

Just multiply

[tex]hopethishelpsyou[/tex]

Answer:

jeeze... this would be easier if the numbers were switched

Explanation:

i dont have an answer for ya but put 80x24=? in ur calculator

good luck m8

Answer:

The torque is  [tex]\tau = B * m sin(\phi )[/tex]

Explanation:

Generally when current flow through a rectangular loop the magnetic dipole generated we can denote this as  [tex]\vec m[/tex]

Here k is the length of the side of one side of the rectangular loop

Now when this loop is place in a magnetic field, the torque it experience is mathematically represented as

      [tex]\vec \tau = \vec B \ X \ \vec m[/tex]

Here  X stands for cross - product

From the question we are told that the angle between the vector ( [tex]\vec m[/tex])perpendicular to the plane of the coil and magnetic field(B) as [tex]\phi[/tex]

So

=>     [tex]\tau = B * m sin(\phi )[/tex]

Answer:

The product of mass X velocity is the same for both

Explanation:

The momentum of a body is the product of its mass and velocity.

  Momentum  = mass x velocity

Two objects having equal momentum will have the same for the product of their mass and velocity.

Answer:

You should tell her in a nice way that that's just not your style and if she doesnt accept that then maybe you should just not talk to her for a while and let her cool down

Explanation:

Hope this helps

Answer:

1 is summer, 2 is most likely winter,3 is most likely summer, and 4 is fall

Explanation:

Complete Question

A coal train in Montana starts from rest and accelerates at 2.5m/s^2 for 15 Find the trains maximum velocity

Answer:

The maximum velocity is   [tex]v =  37.5 \ m/s [/tex]  

Explanation:

From the question we are told that

   The acceleration is [tex]a =2.5\ m/s^2[/tex]

   The time for the acceleration is [tex]t = 15 \  s[/tex]

Generally from the kinematics equation

   [tex]v =  u  +  at[/tex]  

here u  is the initial  velocity and the value  is  0 m/s  given that it started rom rest

     [tex]v =  0  +  2.5  *  15[/tex]  

     [tex]v =  37.5 \ m/s [/tex]  

Answer:

Please find the answers in the explanation

Explanation:

In examination of any scientific observation, some experiments may be needed to be carried out.

When examining evidence, the investigators might want to be more careful examining chemical properties than physical properties because anything that involve chemical reaction are irreversible. While physical one can be reversible.

Also, reaction can easily take place when examining the chemical properties of some substances.

It is seldom for reaction to take place with physical one.

there can be some complications and danger with chemical properties but less complication and danger with physical one.

Therefore, the investigators will want to be more careful when examining evidence on chemical properties than physical properties due to the given reasons above.