IIIIIII-PLEASE HELP-IIIIII THERE ARE TWO QUESTIONS (ILL GIVE BRAINLIST)

Answer:

A force is a push or a pull. It causes an object at rest to move. It can cause an object that is moving to change speed, or the distance covered over time. It can also change which way the object is moving its direction. Lastly, it can also cause an object to stop moving completely. A force has both magnitude and direction. An object with balance forces or a net force of zero will not change position.

Explanation:

Answer:

dark-field microscopy

Explanation:

A darkfield microscope can be regarded as a brightfield microscope with a significant modification to condenser. There is an opaque disk, with a diameter of about 1cm placed in between the illuminator and condenser lens, the disk responsible for the blocking of most of the light from the illuminator, passing through the condenser to objective lens , which will then form hollow cone of light that has its focus on the specimen. Using a darkfield microscope the light that get to the objective is the only refracted or reflected light of structures in the specimen. And the image formed usually display a bright object with a dark background.

It should be noted that darkfield microscope is a type of microscopy works by allowing only light waves that have reflected from or refracted though the sample to enter the lens system.

Answer:

1.318m

Explanation:

The set up is a right angled triangle

Horizontal distance is the distance covered by the hurdler = 0.535m =adjacent

Angle of elevation = 67.9°

Height of the hurdler = opposite

Using the SOH CAH TOA identity

Using the TOA identity

Tan67.9° = opp/adj

Tan67.9 = opp/0.535

Opp = 0.535tan67.9°

Opp = 1.318m

Hence the required height is 1.318m

Answer:

because the density of iron nail is more tha n density of water but the density of ship made iron steel is less than the density of water

Answer:

E∝A²

Energy varies as square of change in amplitude

If amplitude of 1 has energy of 2

Amplitude of 2 (double of 1) = (2x2)=4x2=8  4 times the energy at amplitude of 1.

For 8 units of amplitude change

8x8=64x2= 128  or C:

Explanation:

When the amplitude of the wave is 8 units, the corresponding energy of the wave is 128 units.

The given parameters;

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

[tex]E = \frac{1}{2} kA^2\\\\\frac{E}{A^2} = \frac{E_1}{A_1^2}[/tex]

When the amplitude is 8, the energy of the wave is calculated as follows;

[tex]\frac{2}{1^2} = \frac{E_2}{8^2} \\\\E_2 = 2(8^2)\\\\E_2 = 2(64)\\\\E_2 = 128 \ units[/tex]

Thus, when the amplitude of the wave is 8 units, the corresponding energy of the wave is 128 units.

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Answer:

See the answers below

Explanation:

To solve this problem we must use the following equation of kinematics.

[tex]v_{f}=v_{o}+a*t[/tex]

But first we must convert the velocity from kilometers per hour to meters per second.

[tex]72[\frac{km}{h}]*[\frac{1000m}{1km}]*\frac{1h}{3600s} =20[m/s][/tex]

i)

Vf = final velocity = 20 [m/s]

Vo = initial velocity = 0 (stars from the rest)

a = acceleration [m/s²]

t = time = 4 [s]

[tex]20 = 0+a*4\\a=20/4\\a = 5[m/s^{2}][/tex]

ii)

Now we can calculate the distance with the following equation of the kinematics.

[tex]v_{f}^{2}=v_{o}^{2} +2*a*x[/tex]

where:

x = distance covered [m]

[tex]20^{2} =0 +2*5*x\\400=10*x\\x = 40 [m][/tex]

Answer:

By putting something like a sheet of glass in the water.

Explanation:

Putting a sheet of glass in the water will make the ripples move slower because the speed of a wave depends on the depth of water.

Answer:

The two types of biogenous sediments are calcareous ooze and siliceous ooze

Explanation:

Answer:

follow me for the answer

Answer:

Corvette Corvette

Explanation:

teehee

The answer is A btw :)

When two particle have the same displacement from the equilibrium position and the same velocity, they are said to be in phase with one another.

Phase is the location of a time point on a waveform's cycle. A phase is an dimensionless quantity. While two or more waveforms may have the same frequency, cycle, and wavelength, phase refers to how closely they are aligned.

Particles in a medium said to be in phase with one another  when they have the same displacement from the equilibrium position and the same velocity. As frequency and wavelength is property of waves - not  particles.

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Ultraviolet (UV) "light" is a type of electromagnetic radiation. UV light has a shorter wavelength than visible light. ... The wavelength of violet light is around 400 nanometers (or 4,000 Å). Ultraviolet radiation oscillates at rates between about 800 terahertz (THz or 1012 hertz) and 30,000 THz.

If you're starting at the lowest frequency that our eyes can see, you're at RED light.  

Then, as you hike through higher and higher frequencies, you travel through orange light, yellow light, green light, blue light, violet light.

Suddenly, as you keep going to higher frequency, you can't see the light any more. You've crossed the line from violet to ULTRAviolet. Now your eyes don't know it's there.  The frequency is too high. (Wavelength is too short.)

Answer:

[tex]\huge\boxed{\sf v = 0.75\ m / s}[/tex]

Explanation:

Given Data:

Wavelength = λ = 0.25 m

Frequency = f = 3 Hz

Required:

Speed = v = ?

Formula:

v = fλ

Solution:

v = (3)(0.25)

v = 0.75 m / sec

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Solution :

Given weight of Kathy = 82 kg

Her speed before striking the water, [tex]$V_o $[/tex] = 5.50 m/s

Her speed after entering the water, [tex]$V_f$[/tex]= 1.1 m/s

Time = 1.65 s

Using equation of impulse,

[tex]$dP = F \times dT$[/tex]

Here, F =  the force ,

       dT =  time interval over which the force is applied for

            = 1.65 s

       dP  = change in momentum

dP = m x dV

    [tex]$= m \times [V_f - V_o] $[/tex]

    = 82 x (1.1 - 5.5)

    = -360 kg

∴ the net force acting will be

[tex]$F=\frac{dP}{dT}$[/tex]

[tex]$F=\frac{-360}{1.65}$[/tex]

  = 218 N

Answer:

See the answers below.

Explanation:

In order to solve this problem we must use the principle of conservation of momentum and the amount of movement. Where the car moves to the left with a negative speed sign while the force of the collision will be taken to the right.

[tex]-m_{car}*v_{car1}+(F*t)=m_{car}*v_{car2}[/tex]

where:

Vcar1 = velocity of the car before the collision = - 15 [m/s]

F = impact force [N]

Vcar2 = velocity of the car after the collision = 2.6 [m/s]

[tex]-(1500*15)+(F*t)=(2.6*1500)\\F*t=22500+3900\\F*t=26400[kg*m/s][/tex]

Where the product of force by Time is equal to the impulse caused by the collision.

[tex]And the force\\F = P/t\\F=26400/0.15\\F=176000[N][/tex]

Answer:

The red substance was ionic. The white substance was molecular.

Explanation:

B.C.

If Clarisse had three substances, A white substance was waxy and malleable. A red crystal was translucent, and it cracked when she hit it with a hammer. A silver substance could be flattened by hitting it with a hammer, but it did not crack. the two true statements are the red substance was ionic and the white substance was molecular. therefore the correct option is B and D.

The chemical compound is a combination of two or more either similar or dissimilar chemical elements, for example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.

These chemical compounds are formed because of different types of bonds between the constituent's elements, the chemical bonds are mainly ionic bonds, covalent bonds,s, and hydrogen bonds.

Ionic bonds are formed due to the transfer of electrons between two bond-forming pairs differentiated by their electronegativity.

Covalent bonds are formed by the sharing of electrons. Generally, organic compounds are formed as the reason for covalent bonds.

As the white substance is waxy and malleable and the silvers substance could be flattened by hitting with a hammer but it did not crack it means the white substance is a metallic material that is molecular in nature , the red crystal is translucent and cracked when hit with a hammer this means it is ionic in nature.

Thus, the correct options are option B and option D.

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Answer:

58.8m

Explanation:

Answer:

the mechanical advantage is 10

Explanation:

The computation of the mechanical advantage is as follows:

Mechanical advantage is

= Load ÷ Effort

where,

The Loan is equivalent to the weight i.e. 500 lb

And, the effort is equivalent to the force applied  i.e. 50lb

So, the mechanical advantage is

= 500 ÷ 50

= 10

Hence, the mechanical advantage is 10

Answer:

  about 4.74 seconds

Explanation:

The time to fall distance d from height h is given by ...

  t = √(2d/g)

  t = √(2·110 m/(9.8 m/s^2)) ≈ 4.74 s

It will take the car about 4.74 seconds to fall 110 meters to the river.

__

We assume the car's speed is horizontal, so does not add or subtract anything to/from the time to fall from the height.

Answer:

v = 98.1 m/s

Explanation:

We will apply the law of conservation of energy here, between peak A and peak B.

Total Energy of Ball at A = Total Energy of Ball at B

[tex]K.E_{A}+P.E_{A}=K.E_{B}+P.E_{B}\\where,\\K.E_{A} = Kinetic\ Energy\ of\ ball\ at\ Peak\ A = \frac{1}{2}mv^{2} \\K.E_{B} = Kinetic\ Energy\ of\ ball\ at\ Peak\ B = \frac{1}{2}m(0)^{2} = 0\ J (since, ball\ stops\ at\ last) \\[/tex]

[tex]P.E_{A} = Potential\ Energy\ of\ ball\ at\ Peak\ A = mgh_{A}\\P.E_{B} = Potential\ Energy\ of\ ball\ at\ Peak\ B = mgh_{B}[/tex]

[tex]\frac{1}{2}mv^{2} + mgh_{A} = 0\ J + mgh_{B}\\m(\frac{1}{2}v^{2} + gh_{A}) = mgh_{B}\\v = \sqrt{2g(h_{B}-h_{A})}\\where,\\h_{A} = height\ pf\ peak\ A = 5\ m\\h_{B} = height\ pf\ peak\ B = 10\ m\\v = \sqrt{2(9.81\ m/s^{2})(10\ m-5\ m)}\\[/tex]

v = 98.1 m/s

Explanation:

if we take g=9.8m/s^2

F=mg

m=500

F=500×9.8=4900N

h=2

so w=mgh

w=4900×2

=9800j

Answer:

velocity

Explanation:

Velocity represents the direction of an object with a specified speed

Answer:

Hi... Your answer is impulse

Answer:

2/3.or 0,67

Explanation:

acceleration = Result or sum of force / the mass

a = F/m

a = (35-25)/15

a = 10/15 = 2/3 m/s²

a = 0,67 m/s²

Answer:

cant see to find the answer sorry :( i tried :( good luck !! youll do great <333

Explanation:

sorry ;( best of luck

Answer:

gas vibrate, move about freely at high speeds, liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place

Answer:

1.b 2.d 3.b 4.a 5.c

Explanation:

I tried my very best and I hoped these helped

Answer:

1. B

2.D

3.C

4.B

5.D

Explanation:

i'm not sure if these are correct but hope this helps

Answer:

True

Explanation:

I just know.

Answer:

Cold air from the house is moved through pipes, where it absorbs thermal energy.

Explanation:

Answer:

Like your refrigerator, heat pumps use electricity to move heat from a cool space to a warm space, making the cool space cooler and the warm space warmer. ... The most common type of heat pump is the air-source heat pump, which transfers heat between your house and the outside air.

Is this helpful

Answer:

Acceleration does not affect mass. Acceleration only affects weight.

Explanation:

Your mass is the same on Earth compared to on the moon, but your weight is going to be different because the acceleration due to gravity is going to be different.

Analyzing two-dimensional projectile motion is done by breaking it into two motions: along the horizontal and vertical axes.

hope it helps!!

Answer:

up and down

Explanation:

this is because they do have the correct flagellum to move to the left and to the right