I need help with rounding each of the following to 3 significant figures
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Hi There, Buddy!

To solve this problem, let us divide the entire motion into 2 phases

1.) When the elevator is moving with an acceleration

2.) When the elevator has a deceleration

For the first half -

u = 0 , a = 0.6 , t = t1

v = 0.6(t1)  ---------- ( 1 )

s = 1/2 x 0.6 x (t1)^2 = 0.3(t1^2) -------- ( 2 )

For the second half -

u = 0.6(t1) , a = -0.8 , v = 0

0.6 x (t1) = 0.8 (t2) ----> 3(t1) = 4(t2) ---------- ( 3 )

0.36(t1)^2 = 1.6 s2 ---------- ( 4 )

Now, we know that the total time taken is 10 seconds

------- t1 + t2 =10 , 3t1 = 4t2 ---- t1 = 40/7 , t2 = 30/7

Now, substitute values of t1 and t2 in s1 and s2 and add both s1 and s2 to get total distance travelled.

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Answer:

I am pretty sure the answer is A

Explanation:

I know its not C

I hope this helps and I'm sorry if it does not.

The features of an object which affect its weight are the mass and location which is denoted as option A.

This is defined as the force acting on the object due to gravity and the formula is W = mg where m is mass and g is acceleration due to gravity.

This is why the weight features of an object is affected by its mass and then location.

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Producers are responsible for making all types of matter in living and non-living things in an ecosystem.

An ecosystem may be defined as a place or area where members of different species live together and interact with one another for the purpose of food, shelter, and space.

Producers are organisms which always found at the bottom of each trophic level of an ecosystem. These organisms synthesize their own food and energy from carbon dioxide in presence of sunlight.

After synthesizing energy, they transform their energy to higher trophic levels. Apart from this, several biotic and abiotic factors are also responsible for making up the type of matter in living and nonliving things in an ecosystem.

Therefore, producers are responsible for making all types of matter in living and non-living things in an ecosystem.

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Answer:

what is the period of a pendulum that takes one second to make a complete back-and-forth vibration? Suppose that a pendulum has a period of 1.5 seconds. How long does it take to make a complete back-and-forth vibration? The period of the pendulum would be 1.5 seconds divided by 1 cycle = 1.5 seconds.

Explanation:

because it is

Answer:

Option B. 126 cm.

Explanation:

From the question given above,

The scale = 1 : 42.

Height of the real door =...?

The scale for the tree house project is

1 : 42. This implies that for every 1 cm on paper, it represents 42 cm on land.

Now, if the height of the door on paper is 3 cm, then the height of the door on land = 3 × 42 = 126 cm on land.

Therefore, the real tree house door is 126 cm tall.

Answer:

speed

Explanation:

because speed is fast

Answer: Speed

Explanation:

Answer:

9.81 N

Explanation:

Given that a baseball weighs 1 kg. The pitcher throws the ball at a velocity of 10 m/s straight up. Neglecting air resistance. The maximum height reached will be calculated by using the formula

V^2 = U^2 - 2gH

U = 10 m/s

g = 9.8m/s^2

At maximum height, V = 0

Substitute u and g into the formula

0 = 10^2 - 2 × 9.8 × H

19.6H = 100

H = 100/19.6

H = 5.1 m

The Kinetic energy on the ball will be

K.E = 1/2mv^2

K.E = 1/2 × 1 × 10^2

K.E = 1/2 × 100

K.E = 50 J

But energy = work done

WD = Force × distance (height)

The force that acts on the baseball when it is HALF WAY to the top of the path will be

F × 5.1/2 = 50

F = 100/5.1

F = 19.61 N

The weight acting downward will be

W = mg

W = 1 × 9.8

W = 9.8 N

The net force acting on the ball will be

Net force = F - W

Net force = 19.61 - 9.8

Net force = 9.81 N

Therefore, the net force that acts on the baseball when it is HALF WAY to the top of the path is 9.81 N

Answer:

[tex] \boxed{ \bold{ \huge{ \boxed{ \sf{eon}}}}}[/tex]

Explanation:

The largest formal unit of geologic time is eon .

Hope I helped!

Answer:

a = - 25 m/s²

Explanation:

The magnitude of acceleration or deceleration of an object can be found by using the third equation of motion as follows:

2as = Vf² - Vi²

where,

a = magnitude of acceleration = ?

Vf = Final Velocity = 15 m/s

Vi = Initial Velocity = 25 m/s

s = distance traveled = 8 m

Therefore,

2a(8 m) = (15 m/s)² - (25 m/s)²

a = (- 400 m²/s²)/(16 m)

a = - 25 m/s²

Here negative sign indicates deceleration

Answer:

Unbalanced force -  

Explanation:

Unbalanced force is expected to cause a body to accelerate.

Answer:

Unbalanced force

Explanation:

Unbalanced force is expected to cause acceleration in any body as it's net value is not zero in every direction .

I hope it's helpful

Answer:

4 vector quantities

Explanation:

There are 4 vector quantities given in the paragraph, therefore the correct answer for the given problem statement is option C

The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.

While the scalar quantities do not contain the information of the direction they only have a magnitude of the quantity measured.

As stated in the issue On the Appalachian Path, two hikers cover 2.5 miles to the northeast of the trail. They move along there at a mean speed of 2.3 miles per hour.

They continue walking for another 5.0 miles till the trail gently changes to a straight north direction. The trekkers are now eager to have their lunch.

The hikers take off their 25.0-kilogram backpacks and sit on an unmarked log.

They take 45 minutes to eat, relax, and then continue walking 2 more miles due north.

In the given paragraph there are 3 displacement vectors along with one velocity vector therefore there are 4 vector quantities.\

Thus, there are 4 vector quantities and the correct answer is option C

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Answer:

Speed

Explanation:

Hope this helps!

Answer:

0.645 kg

Explanation:

because 1 kg = 1000 g

so 1 g = 1/1000 kg = 0.001 kg

645 g = (645 x 0.001) kg = 0.645 kg

Answer:

Coerce, compel, constrain

Explanation:

Answer:

4.53×10^9 years old.

Explanation:

Scientific notation is a mathematical term or expression that illustrates a method of representing actual numbers or figures that are often considered too substantial or too insignificant to be written appropriately using normal decimal representation. It can be depicted as "a x 10^n"

Hence, in this case, converting the age of the moon which is 4,530,000,000 years old to scientific notation is equal to 4.53×10^9 years old.

Answer:

4.53×10^9 years old.

Answer:

D, Air Quality Index :)

Hope this helped!

P.S. : Can I get brainliest please?

Answer:

is the first one right

Explanation:

Answer:

yes

Explanation:

Answer:

isotopes

Explanation:

Answer:

The Average Speed Is 2.5 m/s

Explanation:

Answer:

4?

Explanation:

Answer:

The center of gravity is the average location of the weight of an object

Explanation:

Answer:its a physical change as state of matter changes without any reactions

Explanation:when a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring

Answer:

True

Explanation:

Explanation:

3,800 seconds in hours is 1.055556

3,800 seconds in minutes is 63.33333

3,000 seconds in seconds is the same.

Answer:

The force acting on the window is 7000N.

Explanation:

Given that the formula for pressure of solid is P = Force/Area. Then, you have to substitute the values into the formula :

[tex]pressure = \frac{force}{area} [/tex]

[tex]let \: pressure = 2000,area = 3.5[/tex]

[tex]2000 = \frac{force}{3.5} [/tex]

[tex]2000 \times 3.5 = force[/tex]

[tex]force = 7000N[/tex]

Given:-

To Find: Force exerted by the air to the window.

We know,

P = F/A

where,

Similarly,

F = PA

→ F = (2000 Pa)(3.5 m²)

→ F = (2000 N/m²)(3.5 m²)

→ F = (200 N)(35)

→ F = 7000 N (Ans.)

Answer:

Explanation:

VR ( Velocity ratio ) is the ratio of displacement to effort of load. So it is obvious that displacement takes place. Frictional force cannot change the displacement as it only an opposing force. So VR is not affected by friction.

Hope this helps

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Answer:

because VR is velocity ratio

Answer: It would be yards

Explanation:

Answer:

I suppose you are talking about American football, so the answer would be yards.

Explanation:

The field is measured using yards.