a. What is the acceleration of the mass?

b. What net force is acting on the mass during those 3 seconds?

Answer:

a

[tex]a = 21.7 \ m/s^2[/tex]

b

[tex]F = 108.5 \ N[/tex]

Explanation:

From the question we told that

The mass is m = 5 kg

The initial speed [tex]u = 5 m/s[/tex]

The time taken to attain [tex]v = 70 \ m/s[/tex] is t = 3 s

Generally from kinematic equation we have that

[tex]v = u + at[/tex]

=> [tex]70 = 5 + a * 3[/tex]

=> [tex]a = 21.7 \ m/s^2[/tex]

Generally the force acting is mathematically represented

[tex]F = m * a[/tex]

=> [tex]F = 5 * 21.7[/tex]

=> [tex]F = 108.5 \ N[/tex]

HURRY! Please!

How do the lights in a series circuit behave when one bulb burns out?

O The rest of the bulbs continue to shine at maximum brightness.

OThe rest of the bulbs continue to shine at a lower brightness.

OThe rest of the bulbs continue to shine at a higher brightness

OThe rest of the bulbs stop shining and shut off.

**Answer:**

D. The rest of the bulbs stop shining and shut off.

**Explanation:**

When one **bulb **in a **series circuit** burns, out, the **rest **of the **bulbs **stop **shining **and shut off.** **Option **D** is correct.

**What is an electric bulb?**

An **electric bulb** is a **gadget **that uses **electricity** to create **visible light. **It is the most popular type of **artificial lighting** and is necessary for modern society.

The **light bulb** is connected to a **switch **in a **parallel **configuration. The **switch **is **open**, which means there will be a lot of **resistance **and no **current **will flow via this **route**.

Across the **parallel **connection, the **battery **would create the same **potential difference**. Because the **current **would not go via the **open switch**, it would instead flow through the** light bulb**, causing it to **illuminate**.

When one **bulb **in a **series circuit** burns, out, the rest of the **bulbs **stop **shining **and shut off.

Hence, option **D **is correct.

To learn more about the **electric bulb,** refer to the link;

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.

Answer in units of N.

There is nothing to answer because there is no question

Which sentence describes Newton's first law?

A. Forces always come in pairs that have the same magnitude.

B. The action force applied by one object to another is opposite in

direction to the reaction force.

C. It takes a larger net force to accelerate an object at a greater rate.

D. Unbalanced forces cause an object to move.

SM

[tex]\Large{\red{\bf{\blue{\dag} Answer:-}}}[/tex]

**Newton's First Law of Motion **:

An object stays in rest or in uniform motion unless and until compelled by an external unbalanced force . This is also known as " Law of Inertia " .

Here this statement is best represented by the statement : *Unbalanced forces cause an object to move.** ***[**** ****option**** ****c**** ****]**

**More**** to**** know**** ****:****-**

Newton's 3 laws of motion :-

**Newton's**** ****First**** Law**** of**** Motion**** ****:****-**

It states that an object stays in rest or in uniform motion unless and until compelled by an external unbalanced force . This is also known as " Law of Inertia " .

**Ex**** ****-**** ** (i) We tend to fall backwards while standing in the bus , when it starts suddenly.

(ii) We tend to fall forward while standing in the bus , when it stops suddenly.

**Newton's ****Seco****nd**** Law of Motion :-**

It states that the rate of change of momentum is directly proportional to the applied force in the direction of the force . That is ∆p [tex]\propto[/tex] Force .

**Ex**** ****-**** **(i) When we push car & a truck with same force the car will have Greater acceleration due to less mass . (Imaginary case ).

(ii) We feel easy to push a empty cart than a full cart .

**Newton's ****Third**** Law of Motion :-**

It states that every action has equal and opposite reaction .

**Ex**** ****-**** **(i) We are able to walk on ground due to Newton's third law of motion .

(ii) When we push wall it also applies equal and opposite force .

"**Unbalanced **forces cause an **object **to move " is the sentence that describes **Newton's first law.**

A **body **remains in the state of **rest **or uniform **motion **in a **straight **line unless and until an **external **force acts on it.

The **object **is to be rest if the **velocity **and **acceleration **are zero. When an object is in **motion**, **velocity **is **not **equal to **zero **(v ≠ 0) but **acceleration **(a = 0) is equal to **zero**. Therefore, the **object **will continue in motion with **constant **velocity in the **same **direction.

Example:

If we **jump **from a bus while **moving**, our body will be like still moving in the same **direction **of the vehicle. When your feet hit the ground, the **grounds **act on your feet and stop moving. You will fall because the upper part of your body didn't stop and you will **fall **in the **direction **you were moving.

If the **object **have the greater **mass**, then the object will have more **inertia**. Forces can change the **object's **motion.

Hence, **Option D **is the correct answer.

Learn more about **Newton's first law,**

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List two objects here on Earth that are sources of radiant energy. How can you tell they emit radiant energy?

They glow and feel hot

Your friend tells you “I no the moon does not rotate because we always see the same side.” do you agree or disagree with your friend? Write up what you would say to your friend to show why you agree or disagree with them. (THIS IS URGENT I REALLY NEED HELP WITH THIS BECAUSE I DONT KNOW HOW TO EXPLAIN)

**Answer:**

no the moon does not rotate it only goes in circle just like the sun so I disagree with your friend

4. Hijackers are taking over a plane, They tell the pilot to get to Spain as fast as possible. The plane goes from 900

km/hr (beginning speed) to 1140 km/hr (final speed) in just 6 seconds. What is the acceleration of the plane?

The acceleration is about 1457, because of the wind turbines and the way it’s going

i really need help please just answer at least one

**Answer:**

9) a = 25 [m/s^2], t = 4 [s]

10) a = 0.0875 [m/s^2], t = 34.3 [s]

11) t = 32 [s]

**Explanation:**

To solve this problem we must use kinematics equations. In this way we have:

9)

a)

[tex]v_{f}^{2} = v_{i}^{2}-(2*a*x)\\[/tex]

where:

Vf = final velocity = 0

Vi = initial velocity = 100 [m/s]

a = acceleration [m/s^2]

x = distance = 200 [m]

**Note: the final speed is zero, as the car stops completely when it stops. The negative sign of the equation means that the car loses speed or slows down as it stops.**

0 = (100)^2 - (2*a*200)

a = 25 [m/s^2]

b)

Now using the following equation:

[tex]v_{f} =v_{i} - (a*t)[/tex]

0 = 100 - (25*t)

t = 4 [s]

10)

a)

To solve this problem we must use kinematics equations. In this way we have:

[tex]v_{f} ^{2} = v_{i} ^{2} + 2*a*(x-x_{o})[/tex]

**Note: The positive sign of the equation means that the car increases his speed.**

5^2 = 2^2 + 2*a*(125 - 5)

25 - 4 = 2*a* (120)

a = 0.0875 [m/s^2]

b)

Now using the following equation:

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

5 = 2 + 0.0875*t

3 = 0.0875*t

t = 34.3 [s]

11)

To solve this problem we must use kinematics equations. In this way we have:

[tex]v_{f} ^{2} = v_{i} ^{2} + 2*a*(x-x_{o})[/tex]

10^2 = 2^2 + 2*a*(200 - 10)

100 - 4 = 2*a* (190)

a = 0.25 [m/s^2]

Now using the following equation:

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

10 = 2 + 0.25*t

8 = 0.25*t

t = 32 [s]

if two objects are repelled from each other which force most likely caused this?

A. gravitational

B. weak nuclear

C. electromagnetic

D. strong nuclear

C. electromagnetic

**Answer:**

it's C! electromagnetic

**Explanation:**

Which is the best estimate for the width of a typical adult hand?

**Answer:**

About 4-5in

**Explanation:**

An object with a charge of 1.2 C is located 4.5 m away from a second object that has a charge of 0.36 C. Find the electrical force that the objects exert on each other. Use 8.988×10 N⋅m2/C2 for the value of Coulomb's constant. Give your answer to two decimal places.

**Answer:**

[tex]1.917*10^8\ N[/tex]

**Explanation:**

Coulomb's law states that the electric force between two charges is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them. It is given by the formula:

[tex]F=k\frac{q_1q_2}{r^2}\\ \\q_1=first\ charge = 1.2C,q_2=second\ charge=0.36C,k=coulomb\ constant=8.988*10^9 N.m^2/C^2, r=distance=4.5m,F=force\\\\F=8.988*10^9*\frac{1.2*0.36}{4.5^2} =1.917*10^8\ N[/tex]

why is a 5 rupees coin attracted by a magnet? name the metal present in the coin

Hey Mate

See a coin is attracted bcoz he it has a metal names iron Which is easily attracted by the magnets

Hope, you fell my answer Helpful ( ◜‿◝ )♡

The new metal in the coin is Ferritic Stainless Steel

The (old) metal in the coin is Cupro-Nickel

The (old) metal in the coin is Cupro-Nickel

how is kinetic energy is stored

Answer:

Explanation:

Kinetic energy can be stored. For example, it takes work to lift a weight and place it on a shelf or to compress a spring. ... Kinetic energy can also be transferred from one body to another in a collision, which can be elastic or inelastic. One example of an elastic collision would be one billiard ball striking another.

**Explanation:**

Kinetic energy can be stored. For example, it takes work to lift a weight and place it on a shelf or to compress a spring. ... Kinetic energy can also be transferred from one body to another in a collision, which can be elastic or inelastic. One example of an elastic collision would be one billiard ball striking another.

Two fish swimming in a river have the following equations of motion:

X 1 = - 6.4 m + (- 1.2 m/s) t

X 2 = 1.3 m + (- 2.7 m/s) t

Which fish is moving faster?

**Answer:**

The second fish, X2, is moving faster than the first fish, X1

**Explanation:**

The given parameters for the equation of motion of the fishes are;

X1 = -6.4 m + (-1.2 m/s)×t

X2 = 1.3 m + (-2.7 m/s)×t

The given equation are straight line equations in the slope and intercept form, where the slope is the speed and in m/s and the intercept is the starting point of swimming of the fishes

For the first fish, the intercept = -6.4 m, the slope = the speed = -1.2 m/s

For the second fish, the intercept = 1.3 m, the slope = the speed = -2.7 m/s

Whereby the fishes are swimming in the opposite direction of the measurement of length, we have;

The magnitude of the speed of the second fish [tex]\left | -2.7 \ m/s \right | = 2.7 \ m/s[/tex], is larger than the magnitude of the speed of the first fish [tex]\left | -1.2 \ m/s \right | = 1.2 \ m/s[/tex]

Therefore, the second fish, X2, is moving faster than the first fish, X1.

Whats the atmosphere?

**Answer: The atmosphere of Earth is the layer of gases, commonly known as air, retained by Earth's gravity, surrounding the planet Earth and forming its planetary atmosphere.**

**Explanation:**

Which information could a student determine from only the chemical formula of a protein

**Answer:**

**the answer is (D) The number of atoms of each element in the protein**

**Explanation:**

**Answer:**

Which information could a student determine from only the chemical formula of a protein

Which information could a student determine from only the chemical formula of a protein

Which information could a student determine from only the chemical formula of a protein

**Explanation:**

Which information could a student determine from only the chemical formula of a protein

Which information could a student determine from only the chemical formula of a protein

Which information could a student determine from only the chemical formula of a protein

Please help!! The graph in the figure shows the position of a particle as it travels along the x-axis. What is the magnitude of the average speed of the particle between t = 1.0 s and t = 4.0 s?

The **uniform movement **allows to find the **average speed**, for which the correct answer is:

B) 1.3 m / s

**Kinematics **studies the movement of bodies, establishing relationships between **position, velocity** and **acceleration**. In the special case that the **acceleratio**n is **zero** the motion is called **uniform motion**.

v = [tex]\frac{\Delta x}{\Delta t}[/tex]

Where v is the velocity, Δx is the position variation and Δt is the time variation in the analyzed interval.

In this case

v = [tex]\frac{2.0 - (-2.0)}{4.0\ -1.0}[/tex]

v = 1.33 m / s

In conclusion using the **uniform motion** ratios we can find that the correct answer for the **average velocity** is

B) 1.3 m / s

Learn more about **average speed** here:

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Which friction static friction, kinetic friction, or air friction? Can be more than one response.

Gripping friction.

kinetic friction

air friction

static friction

**Answer:**

Kinetic Friction

**Explanation:**

Kinetic friction acts opposite the object's sliding direction. Kinetic friction always opposes the object's sliding direction.

Kinetic energy or friction

A warm-up is the exact same thing as a flexibility workout

True

False

false :) ✨ got you my g

**Answer:**

false

**Explanation:**

did the test this is correct

Help PLZ ;)

Which of the following statements is true about the force of gravity:

(A)The Force of gravity between two objects is directly related to the mass of the largest object.

(B)The force of gravity between two objects is directly related to the product of the object’s masses.

(C) The force of gravity between two objects is inversely related to the mass of the largest object.

(D) The force of gravity between two objects is inversely related to the product of the object’s masses.

**Answer:**

I believe it qould be A) The Force of gravity between two objects is directly related to the mass of the largest object.

**Explanation:**

Calculate: A model airplane has a mass of 3.2 kg. Its propeller pulls it forward with a force of 7.0 N. What is the airplane’s acceleration?

The airplanes acceleration is 2.1875

speed is the ______ an object travels over a given time period.

**Answer: Rate**

**Explanation: Speed is the rate an object travels over a given time period.
**

**Answer:**

Distance

**Explanation:**

Speed is the distance an object travels over a given time period.

A rocket lifts vertically off the launching pad and reaches a final velocity of 450 m/s in 15 seconds. What is its acceleration

**Answer:**

**Explanation:**

The acceleration of an object given it's velocity and time taken can be found by using the formula

[tex]a = \frac{v}{t} \\ [/tex]

where

v is the velocity

t is the time

From the question

v = 450 m/s

t = 15 s

We have

[tex]a = \frac{450}{15} \\ [/tex]

We have the final answer as

30 m/s²Hope this helps you

Which of the following is NOT a vector?

A. Force

B. Acceleration

C. Mass

D. Displacement

**Answer:**

**Explanation:**

Mass is the only one of these that is not vector; everything else has both magnitude and direction.

When do we use Aerobic respiration & anaerobic respiration?

**Answer:**

the process by which organisms use oxygen to turn fuel, such as fats and sugars, into chemical energy. anaerobic respiration does not use oxygen. Respiration is used by all cells to turn fuel into energy that can be used to power cellular processes.

Consider two identical baseballs which start at the same location; their terminal speed at this location is 32 m/s. At t = 0s, Ball A is thrown straight up at m/s; Ball B is thrown at 16m/s 30.0° below the horizontal at 32 m/s. How do the magnitudes of the baseballs' accelerations32 2at t = 0s compare (do not neglect air resistance)?

Complete Question

The complete question is shown on the first uploaded image

Answer:

The correct option is B

Explanation:

From the question we are told that

The terminal velocity of both balls is [tex]v_t = 32 \ m/s[/tex]

The speed with which ball A is thrown up at t =0 s is [tex]v__A}} = 16\sqrt{2}[/tex]

The speed with which ball B is thrown 30° below the horizontal at t =0 s is

[tex]v__{B}} = 32\sqrt{2}[/tex]

Generally the acceleration of ball A is (g i.e acceleration due gravity)given that it is thrown straight up

Generally the vertical acceleration of ball B is mathematically represented as

[tex]a = gcos (90 - 30)[/tex]

[tex]a = gcos (60)[/tex]

Generally the ratio of both acceleration is

[tex]\frac{a__{{A}}}{a__{{B}}}} =\frac{g}{gsin(60)}[/tex]

=> [tex]\frac{a__{{A}}}{a__{{B}}}} = \frac{1}{sin (60)}[/tex]

=> [tex]\frac{a__{{A}}}{a__{{B}}}} = \frac{1}{\frac{\sqrt{3} }{2} }[/tex]

=>[tex]\frac{a__{{A}}}{a__{{B}}}} = \frac{2}{\sqrt{3} }[/tex]

Rationalizing

=> [tex]\frac{a__{{A}}}{a__{{B}}}} = \frac{2}{\sqrt{3} } *\frac{\sqrt{3} }{\sqrt{3} }[/tex]

=> [tex]\frac{a__{{A}}}{a__{{B}}}} = \frac{2 \sqrt{3} }{3}[/tex]

=>[tex]a__{B}} = \frac{2\sqrt{3} }{3} * a__{A}}[/tex]

PLS HELP. WORTH 25 POINTS

Explain how conduction, convection, and radiation drive the water cycle in Earth’s system.

**Answer:**

During the day, sunlight heats the ground, which in turn heats the air directly above it via conduction. At night, the ground cools and the heat flows from the warmer air directly above to the cooler ground via conduction.

**Explanation:**

Luck For You!

The process, in which ** conduction, convection, and radiation **drive the **water cycle **in Earth’s system, is discussed in the answer.

The energy from the sun is what largely drives the **water cycle**. By evaporating water from the oceans, lakes, rivers, and even the soil, this solar energy powers the **cycle**. Through the process of transpiration, more water is transferred from plants to the atmosphere. Water droplets gradually acquire enough mass to fall back to Earth as **precipitation **as liquid water **evaporates **or transpires, forming clouds and water vapour.

The precipitation eventually transforms into runoff or groundwater and makes its way back into the surface reservoirs across a variety of periods. The **hydrosphere **currently contains the same amount of water as it has always contained in the Earth system since the** water cycle **is essentially a** closed system.**

Solar **heat energy** comes on earth's surface via **radiation **to the ponds, lakes, oceans, seas, rivers and other water resources and then the waterbodies get heated via **conduction **and evaporation happens. During evaporation time temperature water vapor goes to high altitude via **convection **of heat and cloud forms.

Learn more about **water cycle** here:

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TIME REMISE

01:57:34

As a person pushes a box across a floor, the energy from the person's moving arm is transferred to the box, and the

box and the floor become warm. During this process, what happens to energy?

O. It is increased.

O It is conserved,

O It is decreased.

O It is created.

**Answer:**

It is conserved

**Explanation:**

B .It's is conserved.

A student is able to run 5 meters in a time of 2 seconds. What is the average speed of this student in m/s?

**Answer:**

2.5

**Explanation:**

You have to find the unit rate, so 5 divided by 2 is 2.5.

A textbook that weighs 2 Newtons is lifted 4 meters. How much work is done on the book?

**Answer:**

**Explanation:**

The work done by an object can be found by using the formula

workdone = weight × distanceFrom the question

weight = 2 N

distance = 4 m

We have

workdone = 2 × 4

We have the final answer as

8 JHope this helps you

One particle has a charge of 4.2 x 10-°C, while another particle has a charge

of 1.10 10-9 C. If the two particles are separated by 0.005 m, what is the

electromagnetic force between them? The equation for Coulomb's law is

F = kongs, and the constant, k, equals 9.00 x 10°Nm2/C2

The formula is F = 9x10^9 x q1 x q2 / r^2

Force = 9x10^9 x (4.2x10-9 x 1.1 x 10^-9) / 0.005^2

I hope you can do the maths on your calculator? Else ask me &!I will help.

Force = 9x10^9 x (4.2x10-9 x 1.1 x 10^-9) / 0.005^2

I hope you can do the maths on your calculator? Else ask me &!I will help.

**Answer:**

1.66*10^-3N

**Explanation:**

How many solutions does this system of equations have?
What role reversal took place during the final illness of Eliezers father?
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