Someone please help me to answer this questions...​

Answer:

a scientific law must be universally correct there could be no contradictions regarding the law anywhere

Answer:

number 2!

Explanation:

Answer:

2s to 4s

Explanation:

Since the graph measures acceleration over time, when the line does not move up or down is when you can see a constant velocity.

Answer:

Its lack of mass production

Explanation:

Your Welcome;)

The limitation of using cellulose is its lack of mass production.

Cellulose is a polymer of glucose. It is obtained from glucose by condensation polymerization to yield a long chain.

Cellulose materials have a high potential of being quite useful as important materials for diverse applications.

However, the problem with cellulose materials is that they can not really be mass produced. This limitation has long encumbered the possibility of using cellulose materials for various applications in material science.

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Answer:

0 m/s²

Explanation:

Velocity is the slope of the position vs time graph.  The graph is linear, so the velocity is constant.  Since the velocity is constant, the acceleration is 0.

Answer:

The net force on the box is 2N and it will make the box to move in a leftward direction

Explanation:

We should understand first of all that forces are vectors. This means that they have both magnitude and direction.

The next thing we will need to do is to set a coordinate system. Let the leftward forces be negative while the rightward forces are positive.

That means that the equivalent forces on the box will be -5N + 3N = - 2N

Hence, the net force on the box is 2N and it will make the box to move in a leftward direction

Answer:

a = 1.16 m/s²

Explanation:

In order to find the acceleration of the ball we will use 3rd equation of motion.

2as = Vf² - Vi²

where,

a = acceleration = ?

s = displacement = 21.9 m

Vf = Final Velocity = 7.14 m/s

Vi = Initial Velocity = 0 m/s (Since, ball starts from rest)

Therefore, using the values, we get:

2a(21.9 m) = (7.14 m/s)² - (0 m/s)²

a = (50.97 m²/s²)/(43.8 m)

a = 1.16 m/s²

Answer:

1.11 s.

Explanation:

From the question given above, the following data were obtained:

Height (H) = 6 m

Acceleration due to gravity (g) = 9.8 m/s²

Time (t) =.?

The time taken for the branch to hit the ground can be obtained as follow:

H = ½gt²

6 = ½ × 9.8 × t²

6 = 4.9 × t²

Divide both side by 4.9

t² = 6/4.9

Take the square root of both side

t = √(6/4.9)

t = 1.11 s

Therefore, it will take 1.11 s for the branch to hit the ground.

please give me brainlest!!

the answer is A.

Explanation:

If transformations from stabilization are minimal, a double pendulum performs basic geometric motion. The highly nonlinear system, furthermore, becomes radically unstable in its motion as significant displacements are introduced, showing that deterministic processes are not inherently predictable

Hello. This question is incomplete. The full question is:

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 29.7 N and the spring scale reads 17.6 N.

What is the magnitude of the force that Earth exerts on the bag?

Answer:

47.3 N

Explanation:

the entire system shown in the question above is at rest. Which greatly facilitates the calculation that we must do. In this case, to measure the magnitude that the force of the earth has on the backpack, you only need to add the two forces that you already know in the system.

In that case, it would be, you should calculate:

F= 29.7 N+ 17.6 N

F= 47.3N

Answer:

The primary reason of seeing the cracker burst and hearing the sound later is because the speed of sound and light. Speed of light is in the vicinity of 3*10^8m,/ sec while the speed of sound is at a distance of 332m/sec. It is similar to lightning that strikes before the sound.

hope this helped you

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Answer:

a). 6 seconds

b). 12 seconds

c). 176.4 meters

Explanation:

a). Equation to be applied to calculate the time taken by the rocket to reach at the peak height,

   v = u - gt

where v = final velocity

u = initial velocity = 58.8 m per sec

g = gravitational pull = 9.8 m per sec²

t = duration of the flight

At the peak height,

v = 0

Therefore, 0 = 58.8 - (9.8)(t)

t =  [tex]\frac{58.8}{9.8}[/tex]

 = 6 seconds

b). Total time of flight = 2(Time taken to go up)

                                    = 2×6

                                    = 12 sec

c). Formula to get the peak height is,

   [tex]h=ut-\frac{1}{2}gt^2[/tex]

   h = (58.8)6 - [tex]\frac{1}{2}(9.8)(6)^2[/tex]

      = 352.8 - 176.4

      = 176.4 meters

Answer:

Option (B).

Explanation:

Given that,

Speed of Pam is 50 km/h

Force acting on an object is given by: F = ma

Pam is driving a car, and Dave is riding in the front passenger seat. Both are wearing seatbelts. As Dave's mass is 1.5 times that of Pam. It means that Dave experiences 1.5 times the force that Pam experiences.  

Hence, the correct option is (B).

Answer:

W

Explanation:

its the longest period of time

Answer:

but for which activity donu need the answer and mention the question clearly

Answer:

We know that

Speed = Distance/ Time

Explanation:

Speed = 50/10

= 5 m/s

Answer:

it is d]

Explanation:

The displacement of the toy car will be 0.79 meters.

The shortest route between two points is displacement.

It is a vector quantity to be displaced. This suggests that it has a size and a direction, and that it may be thought of as an arrow pointing from one place to another.

Distance is never less than displacement; it must always be more than or equal to it.

Displacement can be zero if the starting and end point are the same.

According to the question, the Hot wheel car rolled from 0.72 meters to the 1.51-meter mark.

So, the displacement of the toy car will be :

⇒1.51-0.72

=0.79

Hence, the total displacement will be  0.79 meters.

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Answer:

It helps the answer look clean. It also makes the work easier to work with.

Explanation:

Instead of writing a lot of zeros, all you have to do is add exponents to the number to show how much the decimal moved.

The basic formula is °C + 273.15 = K. The basic formula for converting Fahrenheit into Celsius is (°F − 32) × 5/9 = °C. To convert Fahrenheit degrees into Kelvins, (°F − 32) × 5/9 + 273.15 = K.

Answer:

The barometer is supporting 75 cm of Hg due to atmospheric pressure.

Since the manometer is open to air pressure, the gas pressure is supporting the air pressure plus the 30 cm of Hg.

So the "absolute" gas pressure is 75 + 30 = 105 cm of Hg.

Answer:

It means that 80% of our effort is converted to useful whereas 20% of our effort is wasted to overcome frictional and gravitational force.

Answer:

It means that the total energy produced by the machine is 80 percent and remaining 20 percent is wasted in the term of heat deu to friction.

Hope it is helpful !

Gas particles are farthest apart from eachother.

Solid particles are tightly packed.

Liquid particles are somewhat loose.

Gas particles are rapidly moving and are farthest apart.

:D

Gas particles are spread farther apart from each other.

Gas is a state of matter that has no fixed shape and no fixed volume.

Gases have a lower density than other states of matter, such as solids and liquids.

There is a great deal of empty space between particles, which have a lot of kinetic energy and aren't particularly attracted to one another.

The main characteristics of matter are:

(1) they are easy to compress,

(2) they expand to fill their containers, and

(3) they occupy far more space than the liquids or solids from which they form.

In a gas, particles are in continual straight-line motion.

The kinetic energy of the molecule is greater than the attractive force between them, thus, they are much farther apart and move freely of each other.

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Answer:

There are four rocky, or terrestrial, planets: Mercury, Venus, Earth, and Mars. These planets are called terrestrial planets because they are made up of rocks and metals and have solid surfaces.

Explanation:

Answer:

D. renting retail space at a mall

Explanation:

Answer:

dehydration

Explanation:

Answer:

V₂ = 150 mL

Explanation:

Given that,

Initial volume of a gas, [tex]V_1=300\ mL[/tex]

Initial pressure, [tex]P_1=40\ kPa[/tex]

We need to find the volume of gas if the pressure is changed to 80 kPa. Boyle's law states that the relationship between pressure and volume is inverse. Mathematically,

[tex]P_1V_1=P_2V_2[/tex]

[tex]V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{300\times 40}{80}\\\\V_2=150\ mL[/tex]

So, the new volume is 150 mL.

Answer:

1) acceleration is increased by a factor of four 4X

2) the acceleration increases a factor of 2X

3) the correct answer of 400g

Explanation:

This is a kinematics exercise, where you use the velocity equation to obtain the acceleration, with the final velocity equal to zero.

           v² = v₀² + 2 a x

           0 = v₀² + 2 a x

           a = - v₀² / 2 x

In the case of wanting to give the acceleration as a function of g, we can find the relationship between the two quantities

         a / g = - v₀² / (2 x g)

Let's answer the different questions about this equation

1. The initial velocity is doubled, how much the acceleration is worth

       a/g = - (2v₀) 2 / 2xg

       a = 4 (-v₀² / 2xg) g

acceleration is increased by a factor of four 4X

2. if the stopping distance is reduced by 2, that is, x = x₀ / 2

we substitute

        a/g = (- v₀² / 2g) 2/x

        a =2  (-v₀² / 2x₀g)  g

therefore the acceleration increases a factor of 2X

3. the initial velocity of the hockey player is v₀ = 20 m / s and the stopping distance is

x = 5cm = 0.05m

we calculate the acceleration

        a / g = - 20² / (2 0.05)

        a / g = - 4000 / g

        a / g = - 4000 / 9.8 = 408

        a = 408 g

the correct answer of 400g, the value matches exactly if g = 10 m / s2 is taken

A material that produces magnetic field are called magnets. Magnetic poles refers to the ends of a magnet where the forces are strongest.

Magnetic poles are the regions at each end of a magnet where the external magnetic field is strongest.

A bar magnet suspended in the Earth's magnetic field orients itself north-south. A north magnetic pole is the north-seeking pole of such a magnet or any similar pole.

Thus, the correct option is D.

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Answer:

D magnetic poles-

Explanation:took test