can someone help m e

Answer:

-4000 N

Explanation:

1. First let's look at what we know.

Mass: 1000 kg

Initial velocity: 20 m/s

Final velocity: 0 m/s

Displacement: 50 m

2. Let's try and apply a Kinematics equation here.

Looking at what information we have, I would say that this is the best equation:

v[tex]f^{2}[/tex]=v[tex]o^{2}[/tex] + 2aΔx

3. Plug in the numbers.

0 = 400 + 2(a)(50)

0 = 400 + 100a

-400 = 100a

a = -4 m/s^2

4. Use ∑F=ma

∑F = (1000)(-4)

∑F = -4000 N

Answer: 25

Explanation:

Answer:

General Howe and the British regrouped after losing the hill.

Explanation:

British forces marched to Breed's Hill on 17 June under the order of Major General William Howe. When the British Army marched in waves toward the Americans, Colonel William Prescott issued orders to avoid the fire until British troops came to clear sight in an attempt to protect the dwindling supply of ammunition to the Americans. Many British soldiers have been killed or maimed; the remainder has withdrawn down the hill. In a second wave, the British stormed the hill once again but met with the same fate. So they withdrew again, suffering a large number of casualties.  Eventually the British took the hill in the third attempt but at a great cost of casualties.

Answer: D.

some substances hold onto electrons tighter than other

substances, so they get the extra electrons.

Explanation: When two substances are in contact by rubbing each other, there will be friction between them. The friction will stimulate what we called - Thermal energy. And what thermal energy does is the disrupt the bonding force or enhance it.

We can therefore conclude that some substances hold onto electrons tighter than other substances, so they get the extra electrons. Because at neutral state of the substance, the number of protons is equal to the number of electrons.

Explanation:

SUPONIENDO QUE LA ACELERACIÓN DE LA GRAVEDAD ES [tex]9.80 m/s^{2}[/tex]

USANDO LA SEGUNDA LEY DE NEWTON:

m = 80.0 N/[tex]9.80 m/s^{2}[/tex] = 8.16 kg

Answer:

8kg

Explanation:

using the formula Force(F)=mass(m)×acceleration(a),

since we are finding the mass of the object,we will make m the subject by dividing both sides by a.

you will now get m= f/a

the acceleration on Earth is usually 10m/s

m= 80/10

m= 8/1 which is also 8kg

Answer:

The fundamental wavelength of the vibrating string is 1.7 m.

Explanation:

We have,

Velocity of wave on a guitar string is 344 m/s

Length of the guitar string is 85 cm or 0.85 m

It is required to find the fundamental wavelength of the vibrating string. The fundamental frequency on the string is given by :

[tex]f=\dfrac{v}{2l}\\\\f=\dfrac{344}{2\times 0.85}\\\\f=202.35\ Hz[/tex]

Now fundamental wavelength is :

[tex]\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{344}{202.35}\\\\\lambda=1.7\ m[/tex]

So, the fundamental wavelength of the vibrating string is 1.7 m.

Answer:

In physics, special relativity (also known as the special theory of relativity) is the generally accepted and experimentally confirmed physical theory regarding the relationship between space and time.

We need special relativity in order to solve for quantum gravity. ... The earth was expanding (thus, it's mass was expanding) through space in all directions in order to create gravity **OOPS** forgot, specifically at an accelerating rate… OR… The space must be pushing toward or down on the earth, from every direction.

Answer:

The theory of special relativity explains how space and time are linked for objects that are moving at a consistent speed in a straight line. ... The theory of special relativity was developed by Albert Einstein in 1905, and it forms part of the basis of modern physics.

Explanation:

Answer: sound intensity will decrease to the one - fourth of its initial value.

Explanation:

The relationship between sound intensity and the distance obeys inverse square law, where the intensity of sound is inversely proportional to the square of the distance. That is,

I = 1/ r^2

Where

I = sound intensity

r = distance.

If the distance from the source is doubled, sound intensity will decrease in value to the one - fourth of its initial value.

Answer:

1.) Momentum = 10 units

2.) Because of gravity

Explanation:

According to the Newton 3rd law of motion, we realise that in collision, momentum is always conserved.

So, if a ball is thrown upward with ten units of momentum initially, the “recoil” momentum of the earth will be approximately 10 units of momentum. We do not feel this because of the gravity.

Answer:

The correct option is;

D) Both objects exert the same magnitude of force on each other due to Newton's 3rd law

Explanation:

Newton's third law of motion states that for every action there is an equal and opposite reaction

Since the bowling ball is rolled down the alley while the pin is displaced at such a speed that it flew, we have that the velocity of the rolling ball, v₁ is less than the velocity of the flying pin v₂

Therefore, whereby force = Rate of change of momentum produced we have;

The change of momentum of the ball = m₁×(v₁ - v₁ₐ)

The change of momentum of the pin = m₂×(0 - v₂)

Hence since the pin change in movement (flight) was more suddenly than the slowing down of the ball, the action of the rolling ball is equal to the reaction of the flying pin.

Answer: F = 19.2 N

Explanation: Given that the initial Force = 3.6N

The formula involved is

F = GMm/r^2

Substitute the force F

3.6 = GMm/r^2

If one of the masses is tripled and the distance between the masses is quadrupled. We have

3.6 = (G × 3Mm)/(4r)^2

Where G will be constant.

3.6 = 3GMm/16r^2

Separate the fraction of number

3.6 = 3/16 × GMm/r^2

Make GMm/r^2 the subject of formula

(3.6 × 16)/3 = GMm/r^2

19.2 = GMm/r^2

Therefore, the new force of attraction is 19.2 N

Answer:

a - construct tsunami models

Explanation:

scientists cant effect on earthquakes directly, so its not 2 or 3

for 4 it wont help that much to study waves, so its better for them to make model of tsunami waves

Answer:

open series circuit, (c)

Explanation:

Answer:

Mercury

Explanation:

Mercury streches when it is hot so that is why it goes up when the temperature is higher

Answer:

Explanation: Work=force×distance

W=F×S  where W=10,000J,  F=m×g=225 kg×10 N/kg= 2250 N

⇒S=W/F

     = 10000/2250

     = 4.44 m

The box will be raised 4.53 m

Work done is defined as the product of component of the force in the direction of the displacement and the magnitude of  this displacement .

Work done = F .s = Fs cos (theta)

F = mg

s =h

theta = 0°

cos (theta) = cos 0 = 1

hence , work done = m*g*h

Potential energy is stored in the form of work done

potential energy = work done to raise the box = m*g*h

given

mass (m) = 225kg

work done(WD) = 10,000 J

height (h) = ?

potential energy = m*g*h

10,000 J= 225kg * 9.8m/s^2 * h

h = 4.53 m

The box will be raised 4.53 m

learn more about work done

https://brainly.com/question/16976412?referrer=searchResults

#SPJ3

Answer:

6 m/s^{2}

Explanation:

The formula for force is

F = mass x acceleration

F = 12 N

mass = 2 kg

So, you can change the formula to solve for acceleration.

acceleration = F / mass

a = 12 N / 12 kg

a = 6 m/s^{2}

Answer:

An electrical current is an electrical charge flowing around a circuit. Carried by billions of tiny particles called electrons, the charge is already in the wires.

Explanation:

There are three basic conditions for the electric current flow is to be given below:-

Answer:

The ball will land 12.5m before that hole.

Explanation:

The motion of the golf ball can be considered as a projectile motion, where first its height is 0, then it keeps increasing to a maximum point, after which its height starts decreasing again and hits the ground (height becomes 0 again).

We need to calculate the Range (horizontal distance) of the ball which is given as:

[tex]R=\frac{v_i^2{\cdot}sin2\theta}{g}[/tex]

Where

v(i) = initial velocity = 35 m/s

θ = Initial angle = 35°

g = gravitational acceleration = 9.8 m/s

Substitute in the given formula to find Range:

[tex]R=\frac{(35)^2\cdot{sin}(2)(35)}{9.8}\\R=\frac{(1225)(0.94)}{9.8}\\R = 117.5~m[/tex]

Distance between the hole and position where ball lands = 130m - 117.5m = 12.5m

8.4 × 10⁵ Joules of heat energy can be saved assuming that there is no heat exchange between the washing machine and the environment.

Heat energy is the result of movement of tiny particles called as atoms, molecules, or ions in solids, liquids and gas substances. Heat energy can be transferred from one object to another object.

Let m denote the mass of water and  the specific heat capacity of water. The energy required to raise the temperature of that much water by  would be:

Q = m × c × ΔT

Washing at 30°C would require a temperature change of

ΔT = 30°C - 16°C = 14°C

Washing at 50°C would require a temperature change of

ΔT = 50°C - 16°C = 34°C

In both situations, c = 4.2 × 10³J.kg/ °C while m = 10kg.

Calculate the energy required in either of the situations as:

Washing at 30°C:

Q(30°C) = c × m × ΔT

Q = 4.2 × 10³J.kg/ °C × 10kg × 14°C

Q = 588000 Joules

Washing at 50°C :

Q (50°C) = c × m × ΔT

Q = 4.2 × 10³J.kg/ °C × 10kg × 34°C

Q = 1428000 Joules

1428000 Joules - 588000 Joules = 8.4 × 10⁵ Joules

Learn more about Specific heat capacity here:

https://brainly.com/question/29766819

#SPJ2

Answer:

It is a change in velocity over a period of time.

Explanation:

Answer:

One positive and one negative

Answer:

c

Explanation:

bc the molecules are not so tightly packed it can slide past one another or flow to a new location.

Answer:

The correct answer will be "1/16".

Explanation:

The force or distance between two substances in charge seems to be inversely proportional to the square of the size of the particles.  

The exerted force between "S" and "q" will be:

⇒  [tex]Fsq=\frac{{Q}'}{Q} 1^2[/tex] ...(equation 1)

The exerted force between "S" and "p" will be:

⇒  [tex]Fsp=\frac{{Q}'}{Q} 4^2[/tex] ...(equation 2)

Now,

On the comparison of "equation 1" and "equation 2", we get

⇒  [tex]\frac{1}{16}[/tex]

Answer:

The description of the given scenario is described in the explanation segment below.

Explanation:

The energy transferred could be determined by using the following equation or formula:

   ⇒  Energy transferred = charge × potential difference

The equation that links energy transferred, charge flow, and  potential difference (voltage) is: [tex]E = qV[/tex]

In Science, when a potential difference (voltage) is applied on an object, it gains some potential energy, which is then converted to kinetic energy.

The kinetic energy possessed by the object is responsible for the movement of electrons from one point to another in an electric field.

Hence, the quantity of energy in an electric circuit is directly proportional to the charge and potential difference (voltage) applied on the object.

Mathematically, the energy transferred in an electric field is given by the formula:

[tex]E = qV[/tex]

Where:

Read more: https://brainly.com/question/23153766