HELP ANSWER QUESTION 1

Answer:

a=-5.3m/s2

Explanation:

F=-20N

m=3.75kg

a=?

F=am /:m

a=F/m

a=-20N/3.75kg

a=-5.3m/s2

Answer:

A  identity

Explanation:

got it right on edge

Answer:

The identity of the H2O is what stays the same. The singular answer is A. identity of the H2O

Explanation:

I just took the test and made a 100%! I know that you can too bb i love you!! I hope you have a really great day.

Answer:

-0.9 m/s²

Explanation:

Given:

Δx = 500 m

v₀ = 50 m/s

v = 40 m/s

Find: a

v² = v₀² + 2aΔx

(40 m/s)² = (50 m/s)² + 2a (500 m)

a = -0.9 m/s²

A bullet train moves with an initial velocity of 50 m/s final velocities of 40 m/s, and it covers 500 meters, so the acceleration will be -0.9 m/s².

Acceleration is the term that describes the pace at which the speed and direction of a motion change over time. Anything moving faster or slower inside a straight line is said to be accelerating. Even if the speed is constant, travel on a circle accelerates also because the direction of motion is always changing.

From the given information in the question,

Initial velocity, u = 50 m/s

Final velocity, v = 40 m/s and,

Distance, s = 500 meters

Use equation of motion to find the acceleration of the train :

v² - u² = 2as

(40)² - (50)² = 2(a)(500)

a = -900/1000

a = -0.9 m/s².

Therefore, the acceleration of the bullet train is  -0.9 m/s².

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Answer: C and D

Explanation: I just took took the test

Answer:

The correct answers are C and D.

Explanation:

The friction of the car's moving parts rubbing up against each other and the thermal energy created by the combustion of the car's fuel both create heat that will take away from the energy from the fuel that is transferred to the car's wheels.

In short, some of the energy was not transferred to the wheels because the gears and the combustion create heat.

Explanation:

Energy is involved in changes of state because the energy of particles of matter determines the matter's state.

Changes of state are physical changes in matter.

Energy must be absorbed to change a liquid to a gas.

Sublimation is solid to gas (no liquid involved).

1 D

2 False

3 True

4 D

Answer:

Amplitude is one-half the height of the wave from peak to trough. Wavelength and frequency are inversely proportional: As the wavelength increases, the frequency decreases.

I hope this helps in a way...

Answer:

true

Explanation:

if you stretch a lot and try different/harder things you will become more flexible

Answer:

See explanation

Explanation:

A frame of reference simply refers to a set of coordinates which is used to determine the position and velocity of objects all the objects found in that particular frame. The person inside the car and standing by the highway are in different frames of reference.

Newtons first law of motion states that an object will continue to be at rest or in a state of uniform velocity until it is acted upon by an external force.

Newtons second law states that rate of change of momentum is directly proportional to the impressed force.

Newtons third law states that action and reaction are equal and opposite.

The action of applying brakes leads to an equal reaction of a sudden forward movement. Seat belts help to prevent the occupants of a car from being injured by the sudden stoppage of the car.

Force is simply defined as a push or pull.

Balanced forces do not lead to acceleration of a body but an unbalanced for leads to acceleration of a body.

strong nuclear force, electromagnetic force, weak nuclear force and gravity

Power is the rate of doing work while week is said to be done when the force applied moves a distance in the direction of the force. Power is defined as work/time.

Answer:

Explanation:

Momentum is defines as the product of mas of a body and its velocity,

Given

Mass of Being 747 =

Velocity = 253m/s

Required

Momentum of the body

Substituting the required value into the formula;

Momentum = 4,082,331.33 kg * 253

Momentum = 1,032,829,826.49 kgm/s

Therefore the momentum of the body is 1,032,829,826.49kgm/s

The momentum of fully loaded Boeing 747 is  [tex]1.032 \times 10^{9} \;\rm kg.m/s[/tex].

Given data:

The mass of fully loaded Boeing 747 is, m = 4,082,331.33 kg.

The velocity of cruising is, v = 253 m/s.

The concept of momentum says that the impact created by the applied force is known as momentum. It is expressed as product of mass and velocity.

Then the expression is,

p = mv

Soling as,

[tex]p = 4,082,331.33 \times 253\\\\p=1.032 \times 10^{9} \;\rm kg.m/s[/tex]

Thus, we can conclude that the momentum of fully loaded Boeing 747 is [tex]1.032 \times 10^{9} \;\rm kg.m/s[/tex].

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Answer:

[tex] \boxed{ \sf{See \: below}}[/tex]

Explanation:

Seismograph is a computerized instrument that measures the intensity , origin and speed of the earthquake.

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~[tex] \sf{TheAnimeGirl}[/tex]

Answer:

A flip is also called a reflection

Explanation:

Formula:

F*255.92778=K

83 F *255.92778=301.48k

therefore the answer is:

301.48K

Answer:

The answer is 0.019232211646643. We assume you are converting between moles Chromium and gram. You can view more details on each measurement unit: molecular weight of Chromium or grams The molecular formula for Chromium is Cr. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Chromium, or 51.9961 grams. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between moles Chromium and gram. Type in your own numbers in the form to convert the units!

Answer:

0.019232211646643

Explanation:

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Answer:

Mar's orbital path is more than that of Earth, thus it takes more number of days to orbit around the sun.

Explanation:

Mars takes over 500 days to orbit all the way around the sun than Earth because its distance from the sun (228 million kilometers) is greater than that of Earth (150 million kilometers) which takes it 365 days.

Planets that orbit closer to the sun take shorter time to orbit around the sun because the cover a shorter orbital distance and orbit faster than those planets further from the sun.

For example

Using Earth's distance from the sun, 150 million kilometers and the number of days taken to orbits the sun ,365 days and the distance Mars is from the Earth, 228 million kilometers, you can approximate the time Mar takes to orbit the sun as:

Earth 150 million kilometers  = 365 days

Mars  228 million kilometers= ?

Cross product ; (228 *365) /150 =555 -----(a value closer to that in the question)

Answer:

Explanation:

1) acceleration is the change in velocity of a body with respect to time.

acceleration = velocity/time

Given

velocity = 139m/s

time = 20secs

acceleration = 139/20

acceleration = 6.95m/s²

Hence its average acceleration during the first 20 seconds of the launch is 6.95m/s²

2) Speed is the rate of change of distance with respect to time.

average speed = distance/time

Time = distance/speed

Time = 100/7823

Time = 0.013s

3) Using the equation of motion v² = u²+2as

v² = 0²+2(15)(60)

v² = 30*60

v² =1800

v = √1800

v = 42.43m/s

Answer:

Explanation:

Do it this way

The charge on the oil drop is 6.37 × 10⁻¹⁹ C

Let F be the resultant force on the charge when it is at 45° to the vertical. The horizontal component of this force, f = Fsin45° and the vertical component of this force f' = Fcos45°.

The vertical component of force equals the weight of the charge, mg.

So, f = mg

Fcos45° = mg  (1) where m = mass of oil drop = 3.25 × 10⁻¹⁵ kg and g = acceleration due to gravity = 9.8 m/s²

Also, the horizontal component of the force equals the electric force F' = qE on the charge.

So, f' = qE

Fsin45° = qE  (2) where q = charge on oil drop and E = electric field between the plates = V/d where V = potential difference between plates = 1000 V and d = distance between plates = 2 cm = 0.02 m

Dividing equation (2) by (1), we have

Fsin45°/Fcos45° = qE/mg

tan45° = qE/mg

tan45° = qV/dmg

Making q subject of the formula, we have

q = dmgtan45°/V

Substituting the values of the variables into the equation, we have

q = dmgtan45°/V

q = 0.02 m × 3.25 × 10⁻¹⁵ kg × 9.8 m/s² × tan45°/1000 V

q = 0.02 m × 3.25 × 10⁻¹⁵ kg × 9.8 m/s² × 1/1000 V

q = 0.637 × 10⁻¹⁸ C

q = 6.37 × 10⁻¹⁹ C

So, the charge on the oil drop is 6.37 × 10⁻¹⁹ C.

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Answer: 15,115 J

Explanation: --APEX-- JUST TOOK THE TEST

Answer:

15,115 J

Explanation:

Answer:

it is the impact of a meteorite, volcanic activity, or an explosion.

Oh it has ! It has ! That's exactly where you get all the energy you use to think, breathe, and move.

Answer:

The suitcase weighs 225N

Explanation:

Weight can be defined as the force of gravity acting on an object. The unit of the weight of an object is Newton because it is a force.

Given that mass = 22.5

Weight = ?

Weight = mass × acceleration due to gravity.

Acceleration due to gravity = 10m/s2

W = mg

W = 22.5 × 10

W = 225N.

Hence, the suitcase weighs 225N.

Answer:

Increase the work being done or decrease the time in which the work is completed

Explanation:

I got it right on the quiz i just took :)

Answer:

B. 2.77 x [tex]10^{-4}[/tex] N

Explanation:

The required force can be calculated by:

F = [tex]\frac{Kq_{1}q_{2} }{d^{2} }[/tex]

Where F is the force between the particles, K is the coulomb's constant (9 x [tex]10^{9}[/tex] [tex]Nm^{2}/C^{2}[/tex]), [tex]q_{1}[/tex] is the charge on the first particle, [tex]q_{2}[/tex] is the charge on the second particle and [tex]d^{2}[/tex] is the distance between the particles.

So that:

F = [tex]\frac{9*10^{9}*2.15*10^{-9} *3.22*10^{-9} }{(0.015)^{2} }[/tex]

  = [tex]\frac{6.2307*10^{-8} }{(2.25*10^{-4} }[/tex]

  = 2.7692 x [tex]10^{-4}[/tex]

 The force between the particles is 2.77 x [tex]10^{-4}[/tex] N.

Answer:

b

Explanation:

a pex

Answer:

[tex]\boxed {\tt 3.63636364 \ m/s}[/tex]

Explanation:

Velocity can be found using the following formula:

[tex]v=\frac{p}{m}[/tex]

where p is the momentum and m is the mass.

The woman has a mass of 55 kilograms and a momentum of 200 kilogram meters per second.

[tex]p= 200 \ kgm/s\\m=55 \ kg[/tex]

Substitute the values into the formula.

[tex]v=\frac{200 \ kg m/s}{55 \ kg}[/tex]

Divide. Note that the kilograms, or kg, will cancel each other out.

[tex]v=\frac{200 \ m/s}{55}[/tex]

[tex]v= 3.63636364 \ m/s[/tex]

The woman's velocity is 3.63636364 meters per second.

Answer:

There are 2.5 x 10¹⁸ electrons in 0.4 C.

Explanation:

The charge of one electron = 1.602 x 10⁻¹⁹ C

Therefore, the number of electrons in 0.4 C is calculated as follows;

1.602 x 10⁻¹⁹ C -------------> 1 electron

0.4 C --------------------------> x

x = (0.4 ) / (1.602 x 10⁻¹⁹)

x = 2.5 x 10¹⁸ electrons

Therefore, there are 2.5 x 10¹⁸ electrons in 0.4 C.

Answer:

-1.5 m/s^2

Explanation:

Acceleration is Final velocity - Initial Velocity/Time (seconds)

30-48= -18

-18/12 = -1.5

-1.5 m/s^2

Answer: A. Marco places a toy car at the top of a ramp. He releases the car and measures how long it takes for the car to reach the bottom of the ramp. Then, he returns the car to the top of the ramp, releases the car again, and makes an additional measurement

Answer:

Explanation:

g means gravitation

G is universal gravitational constant

M = mass of the earth

R = radius of the earth

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