Two carts move directly toward one another on an air track. Cart 1 has a mass of 0.35 kg and a speed of 1.2 m>s. Cart 2 has a mass of 0.61 kg and a speed of 0.85 m>s. What is the total momentum of the system, assuming that cart 1 moves in the positive direction?

What’s Brainlyest? Can you post a picture of the question or farther explain what (m>s) means?

Convert: 12 km/hr =

m/s

[tex]12~ \text{km} ~ \text{h}^{-1} = \dfrac{12 \times 1000}{3600} ~~ \text{m s}^{-1} = 3.33 ~~ \text{m s}^{-1}[/tex]

**Answer:**

3 1/3 or 3.3333....

**Explanation:**

You multiply the kilometres by 1,000 because there are 1,000 metres in a kilometre. Then you divide by 60 because there are 60 minutes per hour, and then again by 60 because 60 seconds per minute.

12,000 / 60 = 200

200 / 60 = 3.333

Calculate Kylie’s weight at 3 radii away from the center of the earth. Kylie weighs 565.4N on the earths surface

**Answer:**

**Earth's mass is 5.98 x 1024 kg and has a radius of 6.37 x 106 m. 8.06 N/kg ... what would be the weight of a 70.0-kg student on the surface of Jupiter?Explanation:**

A firecracker is placed in the middle of a room. When the firecracker explodes the parts of the firecracker scatter in all different directions. The total combined momentum of all the parts of the firecracker added together after the explosion must be

A.

more than before the explosion.

B.

less than before the explosion.

C.

can not tell from the given information

D.

the same as before the explosion.

Because **momentum** is a **vector quantity**, the total combined momentum of all the parts of the firecracker added together after the explosion **must be the same** as before the explosion. The **correct answer** is** D**

Given that a firecracker is placed in the middle of a room. This means that the firecracker is at rest. That is its momentum is equal to zero. When the firecracker is lit up, it will move in a certain velocity before it explodes. Since the total combined momentum of all the parts of the firecracker scatter in all different directions are considered, that is added up, then **momentum will always be conserved**. That is,

The momentum of an object before explosion will always be equal to the momentum of the object after explosion.

Because **momentum is a vector quantity**, in which we must consider it **magnitude and direction**, the best answer to this question is option **D**.

That is,

The total combined momentum of all the parts of the firecracker added together after the explosion must be the same as before the explosion

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If the force to stretch a spring is given as k = (100N/m), then what is the potential energy of the spring if it is stretched 1 meters from rest?

**Answer:**

50 Joules

**Explanation:**

An object is dropped from a building and strikes the ground with a speed of 52 m/s. How tall is the building?

**Answer:**

5.3 0 meter is the hight of the building is it

A 2.6 kg mass attached to a light string rotates on a horizontal,

frictionless table. The radius of the circle is 0.525 m, and the

string can support a mass of 17.9 kg before breaking. The

acceleration of gravity is 9.8m/s2. What maximum speed can

the mass have before the string breaks?

The **maximum speed **the **mass **can have before it **breaks **is** 2.27 m/s.**

The given parameters:

The** maximum speed **the **mass **can have before it breaks is calculated as follows;

[tex]T = ma_c\\\\Mg = \frac{Mv^2}{r} \\\\v^2 = rg\\\\v = \sqrt{rg} \\\\v_{max} = \sqrt{0.525 \times 9.8} \\\\v_{max} = 2.27 \ m/s[/tex]

Thus, the **maximum speed **the **mass **can have before it **breaks **is** 2.27 m/s.**

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Two boats race in the water. One turns around to head back in the other direction to complete the race, but it collides into the boat that was now directly in front. What forces may have been a part of the collision? Describe them in detail.

The** two forces** involved in this **collision **are the** colliding force** and the **reaction force **which are **equal **in **magnitude **but **opposite **in **direction**.

According to** Newton's third law**, **action **and **reaction **are **equal **and **opposite**. This law is very important in describing** head - on collisions **between objects and is particularly apt in describing the collision between the** two boats.**

In this collision, **two forces** are important these are the action and the reaction. The **action **is the **colliding force** which the boat that was hit experiences. The **reaction force **is the force that this boat experiences as a result of hitting the boat in front of it. The both forces are **equal **in **magnitude **but **opposite **in **direction**.

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A furniture crate of mass 60 kg is at rest a loading ramp that makes an angle of 25° with the horizontal

The coefficient of kinetic friction between the crate and the ramp is 0.2. What force, applied parallel to the incline, is required to push the crate up the incline at a constant speed?

**Answer:**

furniture crate of mass 60 kg is at rest a loading ramp that makes an angle of 25° with the horizontal

The coefficient of kinetic friction between the crate and the ramp is 0.2. What force, applied parallel to the incline, is required to push the crate up the incline at a constant speed?

**Explanation:**

furniture crate of mass 60 kg is at rest a loading ramp that makes an angle of 25° with the horizontal

The coefficient of kinetic friction between the crate and the ramp is 0.2. What force, applied parallel to the incline, is required to push the crate up the incline at a constant speed?

[tex] \huge \boxed{ \sf lol}[/tex]

a car travels at a constant speed of 20m/s and yet it does not have a constant velocity. explain how this could be

**Answer:**

HOPE THIS HELPS!!

**Explanation:**

Velocity is speed as well as distance mentioned.

The car is traveling at a constant speed of 20m/s but it may not be traveling in any particular direction. It would be taking many turns (left and right) or it would be moving in a circular manner.

So,it is at constant speed but not constant velocity.

A projectile is fired with a velocity of 320 ms at an angle of 30 degree to a horizontal.1 Find the time to reach the maximum height. 2 it's horizontal range.

(a) The **time **taken for the **projectile **to reach the **maximum height** is **32.65 s.**

(b) The **horizontal range** of the **projectile **is **9,049.1 m.**

The given parameters:

Initial velocity of the projectile, u = 320 m/sAngle of projection, = 30 degreesThe **time **taken for the **projectile **to reach the **maximum height** is calculated as follows;

[tex]v_f = u- gt\\\\0 = 320 - 9.8t\\\\9.8t = 320\\\\t = \frac{320}{9.8} \\\\t = 32.65 \ s[/tex]

The **horizontal range** of the **projectile **is calculated as follows;

[tex]R = \frac{u^2 sin(2\theta)}{g} \\\\R = \frac{320^2 \times sin(2\times 30)}{9.8} \\\\R = 9,049.1 \ m[/tex]

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Explain why the formation of sand is a physical change.

In chemical changes new substances are formed and the process is often difficult to reverse. During chemical changes particles do change with atoms or ions regrouping.Bonds between atoms break and new ones

form and energy is either given out or

taken in. Some chemical changes are

initiated by mixing

form and energy is either given out or

taken in. Some chemical changes are

initiated by mixing

**Answer:**

The formation of sand is a physical change because some of the physical properties of the rocks change, but their identities do not. The particles of rock are rearranged as their sizes and shapes change, but their identities and total mass remain the same.

What is the magnitude of the resultant of

a 3.0-

meter displacement and a 4.0-meter

displacement as shown in the diagram?

A. 1.0 meter

4.0 meters

B. 5.0 meters

3.0 meters

C. 7.0 meters

D. 12 meters

A**nswer:b. 5.0 meters**

**Explanation: d² = 3²+4²**

**d² = 9+16**

**d² = 25**

**d = √25**

**d = 5m**

The **magnitude **of the **displacement **is** 5 m **as shown in the diagram. Option B is correct.

**What is displacement?**

Displacement can be defined as the total **change **in the **position **of the **object**. It is a **vector quantity**.

From the **Pythagorean** **theorem**,

[tex]d =\sqrt { 3^2 +4^2}\\\\d = \sqrt {25}\\\\d = 5[/tex]

Therefore, the **magnitude **of the **displacement **is** 5 m.**

Learn more about **Displacement**:

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what is a velocity of an object with a momentum of 300 kg m/s and the mass of 100 kg

**Answer:**

v = 3 m/s

**Explanation:**

P is the momentum

m is the mass

v is the velocity

P = m•v

300 = 100•v Divide both sides per 100

300/100 = v

v = 3 m/s

[tex]\text{Given that,}\\\\\text{Momentum, p = 300 kg m s}^{-1}\\\\\text{Mass, m = 100 kg}\\\\\text{We know that,}\\\\p = mv\\\\\implies v = \dfrac pm = \dfrac{300}{100} = 3 ~ \text{m s}^{-1}[/tex]

PLZZZ HELPPP ASAP

I really need help as soon as possible

**Answer:**

Friction

**Explanation:**

As the toy cars rolls away, more friction is created. The more friction there is, the more friction on surface rubs against another which creates friction which in-term slows it down. Hope this helps.

1. How much energy is needed just to melt 0.56kg of ice at 0◦ C?

2. How much energy is needed just to boil 5kg of water at 100◦ C?

3. What is the specific heat of metal if its mass is 27 g and it requires 420 J of heat energy to

increase its temperature from 25°C to 50°C?

please help me out I dont have much time

**Answer:**

This will require 266.9 of heat energy.

**Explanation:**

To calculate the energy required to raise the temperature of any given substance, here's what you require:The mass of the material, m The temperature change that occurs, ΔT The specific heat capacity of the material,

c

(which you can look up). This is the amount of heat required to raise 1 gram of that substance by 1°C.

Here is a source of values of

c for different substances:

Once you have all that, this is the equation:

Q=m×c×ΔT(Q is usually used to symbolize that heat required in a case like this.)For water, the value of c is 4.186g°C So, Q=750×4.186×85=266=858=266.858

The body weighs 15N. What is the mass of that body?

The equation you can use to find the mass is:

Weight = mass x gravity

Where you can rearrange the equation to find the mass.

Mass = weight/gravity

The known values are:

Weight = 15

Gravity = 9.81

Substitute the known values into the equation.

Mass = 15/9.81

Mass = 1.53kg (rounded to 2dp)

Weight = mass x gravity

Where you can rearrange the equation to find the mass.

Mass = weight/gravity

The known values are:

Weight = 15

Gravity = 9.81

Substitute the known values into the equation.

Mass = 15/9.81

Mass = 1.53kg (rounded to 2dp)

a -0.06 C charge is placed in a uniform electric field with a strength of 200 N/C. what is the magnitude and direction of the force on the charge

The magnitude and direction of the f**orce on the charge** is **-12 N opposite the electric field**

To calculate the **force on a charge** in an** electric field**, we make use of the formula below.

**Formula**

F = E×Q .......................... Equation 1

Where:

F =From the question,

Given:

E = 200 N/CQ = -0.06 CSubstitute these values into equation 1

F = 200(-0.06)F =Note: **The negative sign indicates that the force is in the direction negative of the electric field.**

Hence, The magnitude and direction of the f**orce on the charge** is **-12 N opposite the electric field**

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**Answer: A edge 202694020**

**Explanation:**

help will give brainlist

Which unit is used for current?

power

resistance

voltage

amperes

The answer is D amperes

A train starts at rest and ends up with 1500 J of kinetic energy. How much work was done on the train?

**Answer:**

1500 J

**Explanation:**

Apparently, we're to assume that no energy is lost to friction or other effects. Then all of the energy the train has is due to work being done on it.

** 1500 J of work was done on the train**

A car travels 120 miles in 12 hours. What is

the car's speed?

Select one:

O a. 10 m/s

b. 10 mph

c. 1200 mph

O d. 0.1 m/s

**Answer:**

*I **hope** it** will** help** you**.**.**.*

*#**C**A**R**R**Y**O**N**L**E**R**A**N**I**N**G*

i do believe that i need help

WHAT IS THAT omg Helpppp

A bullet of mass M1, is fired towards a block

of mass m2 initially at rest at the edge of a

frictionless table of height h as in the figure.

The initial speed of the bullet is vi. Consider

two cases. a соmрlеtеlу inсlаѕtiс one and an

elastic one where the bullet bounces off the block. What is the flight ratio time?

The **ratio **of** time of flight** for **inelastic collision** to **elastic collision** [tex](t_A :t_B)[/tex] is **1:2**

The given parameters;

Considering** inelastic collision**, the **final velocity** of the system is calculated as;

[tex]m_1u_1 + m_2u_2 = v(m_1 + m_2)\\\\m_1u_1 + 0 = v(m_1 + m_2)\\\\v= \frac{m_1u_1}{m_1 + m_2} \ -- (1)\\\\[/tex]

The **time **of **motion **of the **system **form **top **of the table is calculated as;

[tex]v = u + gt\\\\v = 0 + gt\\\\v = gt\\\\t= \frac{v}{g} \\\\t_A = \frac{m_1u_1}{g(m_1 + m_2)} \ \ ---(2)[/tex]

Considering** elastic collision**, the **final velocity** of the system is calculated as;

[tex]m_1u_1 + m_2 u_2 = m_1v_1 + m_2v_2\\\\m_1u_1 + 0 = m_1v_1 + m_2v_2\\\\m_1 u_1 = m_1v_1 + m_2v_2[/tex]

Apply **one-directional velocity**

[tex]u_1 + (-v_1) = u_2 + v_2\\\\u_1 -v_1 = 0 + v_2\\\\v_1 = v_2 -u_1[/tex]

**Substitute **the **value **of [tex]v_1[/tex] into the above equation;

[tex]m_1u_1 = m_1(v_2 - u_1) + m_2 v_2\\\\m_1u_1 = m_1v_2 -m_1u_1 + m_2v_2\\\\2m_1u_1 = m_1v_2 + m_2v_2\\\\2m_1u_1= v_2(m_1 + m_2)\\\\v_2 = \frac{2m_1u_1}{m_1+ m_2} \ --(3)[/tex]

where;

[tex]v_2[/tex] is the** final velocity** of the **block **after collision

*Since the** bullet bounces off**, we assume that **only the block fell **to the ground from the table.*

The **time **of **motion **of the block is calculated as follows;

[tex]v_2 = v_0 + gt\\\\v_2 = 0 + gt\\\\t = \frac{v_2}{g} \\\\t_B = \frac{v_2}{g} \\\\ t_B = \frac{2m_1u_1}{g(m_1 + m_2)} \ \ ---(4)[/tex]

The **ratio **of** time of flight** for **inelastic collision** to **elastic collision** is calculated as follows;

[tex]\frac{t_A}{t_B} = \frac{m_1u_1}{g(m_1 + m_2)} \times \frac{g(m_1 + m_2)}{2m_1u_1} \\\\\frac{t_A}{t_B} = \frac{1}{2} \\\\t_A:t_B = 1: 2[/tex]

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Please help someone. A generator consumes 147 joules of energy in fuel and produces 75 joules of energy

in electricity. Engineers are challenged to produce a generator that is 20% more

efficient. Which of the following combinations of input and output energy represents a generator that has met this design challenge?

a. 150 joules of fuel to produce 90 joules of electricity

b. 135 joules of fuel to produce 68 joules of electricity

c. 60 joules of fuel to produce 100 joules of electricity

d. 115 joules of fuel to produce 82 joules of electricity

**Answer:**

**A**

**Explanation:**

Current effiency

= 75/147

= 0.5102

New Efficiency

= 120/100 × 0.5102

= 0.6122

Only option A satisfies this efficiency.

What is centripetal force and elastic force

**Answer:**

centripetal force is a net force that acts on an object to keep it moving along a circular path and elastic force acts to return a spring to its natural length

mrs. knight drops her briefcase. when the briefcase lands on the floor, what is the reaction force to the action force of the briefcase on the floor?

**Answer:**

The force of the floor on the briefcase

**Explanation:**

The briefcase hits the floor and stops the falling which is reacting to the briefcase that was falling and hits the floor.

The falling briefcase would be the action force because it is moving downward

and

The reaction force would be the floor because it will react on the briefcase.

Hope this Helps

When the briefcase lands on the floor, the** reaction force** to the action force of the briefcase on the floor is** force **of **the floor **on **the briefcase.**

It might be difficult to distinguish between **action **and **reaction forces. **This is due to the fact that both forces are always present.

One might argue that there are an equal number of forces in the universe if one were to count them all. However, the definition of the **action force** is provided by the perspective of the interaction analysis in order to help the argument.

A force that is applied to an object is known as an **action force.**

An action force with an opposite direction has an effect called a** reaction force.**

These two forces—also referred to as action and reaction forces—are covered by **Newton's third law of motion.**

Learn more about **force **here:

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#SPJ5

Explain the relationship between pitch and frequency.

**Answer:**

Though pitch and frequency are not equivalent, they are correlated. This means that as one goes up, the other does as well. A higher frequency produces a higher pitch, and a lower frequency produces a lower pitch.

**Explanation:**

Share your thoughts about this statement by John Wesley

"Electricty is the soul of universe"

**Answer:**

**I think this statement is true at least in modern day times. The world runs on nothing but technology. People use more technology instead of old school textbooks and papers. Imagine living in a world without technology… that means no cars, no trains, no devices, no machines like your stove or printer, no lights and lots more. John Wesley is 100 percent correct with this statement. Electricity is indeed the powerhouse of the universe. **

If there were no dark energy in the universe, the value of __________ would solely determine the evolution and fate of the universe.

**Answer:**

Ωmass

**Explanation:**

If there were no dark energy in the universe, the value of Ωmass would determine the evolution and fate of the universe.

8. Placing your vehicle between the pilot/escort vehicle and an oversize/overweight vehicle can be dangerous.A. TrueB. False

**Answer:**

A because that's the answer

What is the average speed of a car that travels 30 m in the 3 secs and 2 m 4 secs and 20 m 5 secs

**Answer:**

4.3333333

**Explanation:**

total distance / total time taken

30 + 2 + 20 / 3 + 4 + 5

52 / 12

4.3 recurring

Select the adverb phrase to complete the sentence.I worked at the summer camp [Choose...] before it closed down.
write down the application areas of an ICT?
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Owen earned some money at a summer job. He saved 1/4 of the money and spent 1/3 of the rest on a t-shirt. He then spent the remaining money on downloading some songs. 1.What fraction of the money did he spend on the downloads?2. If the t-shirt cost 20$, how much money did Owen earn at the summer job?
Write the linear equation into Standard Form. 8+3x=-9y
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which expression represents 100 less than 3 times the sum of 18 and 2
5 MINUTES to answer pls help. 20 Points
A given skull has flaring zygomatics, shovel-shaped incisors, round orbits, and moderate nasal aperture width. The ancestry of this individual is likely ________________
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URGENTT 2 SIMPLE EASY QUESTIONS PLZZ HELP ION UNDERSTAND COMPUTERR ILL GIVE U BRAINLEST
Find a scale with a unit of 1 and choose the correct answer (for example, 1 cm=7 yards).Car 18ft moele 5inScale: _____1 in = 3.6 ft1 ft=18 in1 in = 10 ft1 ft=11 in
please i beg for help !!!!!!!!!!! will mark brainlist
The Yazoo Lands refers to areas on Georgias frontier. After the Revolutionary War, these were lands far from Georgia's mostly population, and much of it was located in what is now Alabama and . In order to protect the settlers that did live there, in Georgia Governor George Matthews signed the Yazoo Act, giving the government the authority to sell land to private companies at a very discounted price. However, these companies had very close ties to many in Georgia politics, so when they re-sold the lands a highly prices, many people suspected something illegal was going on. Furious Georgia voters caused many legislators to flee the state. When a new General Assembly met in , the Act was repealed, but later- in the Supreme Court ruled that the repeal of the law was unconstitutional. The Yazoo Land Fraud- as it became known- finally came to an end in 1814 when purchased the land.
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