Plz help this is so confusing

Answer:

Our average speed was 50 mph

Explanation:

Constant Speed Motion

An object is said to travel at constant speed if the ratio of the distance traveled by the time taken is constant.

Expressed in a simple equation, we have:

[tex]\displaystyle v=\frac{d}{t}[/tex]

The distance we had to drive is d=150 miles. If we left at 1 p.m. and got to the hotel at 4 p.m. This means we took t=3 hours to get there.

The average speed is:

[tex]\displaystyle v=\frac{150\ miles}{3\ h}[/tex]

[tex]v=50\ mi/h[/tex]

Our average speed was 50 mph

Answer:

[tex]\boxed{\bold { \large { \boxed {KE=\frac{1}{2} mv^2}}}}[/tex]

Explanation:

Kinetic energy formula

[tex]\displaystyle KE=\frac{1}{2} mv^2[/tex]

[tex]\displaystyle KE \Rightarrow \sf kinetic \ energy \ (J)[/tex]

[tex]\displaystyle m \Rightarrow \sf mass \ (kg)[/tex]

[tex]\displaystyle v \Rightarrow \sf velocity \ (m/s)[/tex]

Answer:

C. Y

Explanation:

From Newton's second law of motion, we know that:

       Force = mass x acceleration

So;

      acceleration  = [tex]\frac{Force }{mass}[/tex]  

 Therefore, to have the highest acceleration at a constant force, the mass must be low. Acceleration is inversely proportional to mass.

Y has the least mass and it will have the highest acceleration

Answer:

Which element?

U did not mention it

Answer:

The earth, The sun, the solar system and the milky way.

Answer:

Data

Explanation:

Data is factual information not subject to bias.

This ultimately implies that, data connotes fact, thus, it is an information that is credible, accurate, a statement of truth, evidential and proven.

In Computer programming, a data dictionary can be defined as a centralized collection of information on a specific data such as attributes, names, fields and definitions that are being used in a computer database system.

In a data dictionary, data elements are combined into records, which are meaningful combinations of data elements that are included in data flows or retained in data stores.

This ultimately implies that, a data dictionary found in a computer database system typically contains the records about all the data elements (objects) such as data relationships with other elements, ownership, type, size, primary keys etc. This records are stored and communicated to other data when required or needed.

Answer: The displacement is 1 block.

Explanation:

Let's define:

The right is the positive side.

The left is the negative side.

Then if you start at position A, and you walk N blocks to the right, the new position is:

A + N

And if you start at position A, and you walk M blocks to the left, the new position is:

A - M.

In this case, we know that Kayla starts at -3 and she walks 5 blocks to the right.

Then her new position is:

-3 + 5 = 2

Now she walks 3 blocks to the left, then her new position is:

2 - 3 = -1

The displacement will be equal to the difference between the final position (-1) and the initial position (-2)

Then the displacement is:

D = -1 - (-2) = -1 +2 = 1

The displacement is 1 block.

Pulleys are powerful simple machines. They can change the direction of a force, which can make it much easier for us to move something. If we want to lift an object that weighs 10 kilograms one meter high, we can lift it straight up or we can use a pulley, so we can pull down on one end to lift the object up.

Answer:

Pulleys are powerful simple machines. They can change the direction of power, which can make it much easier for us to move something. If we want to lift an object that weighs 10 kilograms one meter high, we can lift it straight up or use a pulley, so we can pull one end down and lift the object.

Explanation:

Answer: b. Electrons move from glass to silk

Explanation:

When the glass rod is rub over against the silk, the glass loses the electrons due to the physical contact with the silk and the friction so produced.  The surface of the glass becomes positively charged and the surface of the silk becomes negatively charged. As the surface of the glass loses electrons which are accepted by the silk surface.

Answer:

a) because this is in series, we have:

the total resistance is 3 + 1 = 4 (ohm)

b) the curren in the circuit is 12/4 = 3 (A)

c) the voltage in R = 3 ohm is 3.3 = 9 (V)

the voltage in R = 1 ohm is 12 - 9 = 3 (V)

Answer:

The magnitude of F when t=4 s=146.64 N

Explanation:

We are given that

Mass of crate,m=6.00 kg

Height of crate above its initial position is given by

[tex]y(t)=(2.80 m/s)t+(0.610 m/s^3)t^3[/tex]

We have to find the magnitude of F when t=4.00 s

Differentiate w.r.t t

[tex]\frac{dy}{dt]=2.8+3(0.61)t^2[/tex]

[tex]\frac{d^2y}{dt^2}=6(0.61)t[/tex]

[tex]a(t)=\frac{d^2y}{dt^2}=6(0.61)t m/s[/tex]

[tex]a(4)=6(0.61)(4)=14.64 m/s^2[/tex]

Now, magnitude of force

[tex]F=m(a+g)=6(14.64+9.8)=146.64N[/tex]

Hence, the magnitude of F when t=4 s=146.64 N

Answer:

80 m

Explanation:

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

Speed = 8 m/s

Time = 10 s

Distance =?

Speed can be defined as the distance travelled per unit time. Mathematically, it can be expressed as:

Speed = Distance / time

With the above formula, we can obtain the distance travelled as illustrated below:

Speed = 8 m/s

Time = 10 s

Distance =?

Speed = Distance / time

8 = Distance / 10

Cross multiply

Distance = 8 × 10

Distance = 80 m

Therefore, the distance travelled is 80 m

Answer:

No. Touching a live electric current is never a good idea.

Answer:

false you would electrocute yourself

Explanation:

!!!!!!!!!!!     LOGICAL     !!!!!!!!!

Answer:

We're no strangers to love

You know the rules and so do I

A full commitment's what I'm thinking of

You wouldn't get this from any other guy

I just wanna tell you how I'm feeling

Gotta make you understand

Never gonna give you up

Never gonna let you down

Never gonna run around and desert you

Never gonna make you cry

Never gonna say goodbye

Never gonna tell a lie and hurt you

We've known each other for so long

Your heart's been aching but you're too shy to say it

Inside we both know what's been going on

We know the game and we're gonna play it

And if you ask me how I'm feeling

Don't tell me you're too blind to see

Never gonna give you up

Never gonna let you down

Never gonna run around and desert you

Never gonna make you cry

Never gonna say goodbye

Never gonna tell a lie and hurt you

No, I'm never gonna give you up

No, I'm never gonna let you down

No, I'll never run around and hurt you

Never, ever desert you

We've known each other for so long

Your heart's been aching but

Never gonna give you up

Never gonna let you down

Never gonna run around and desert you

Never gonna make you cry

Never gonna say goodbye

Never gonna tell a lie and hurt you

No, I'm never gonna give you up

No, I'm never gonna let you down

No, I'll never run around and hurt you

I'll never, ever desert you

Explanation:

RICK ROLLED

Answer:

7.35 m/s

Explanation:

Using y - y' = ut - 1/2gt², we find the time it takes the ball to fall from the 1.2 m table top and hit the floor.

y' = initial position of ball = 1.2 m, y = final position of ball = 0 m, u = initial vertical velocity of ball = 0 m/s, g = acceleration due to gravity = 9.8 m/s² and t = time taken for ball to hit the ground.

So, substituting the values of the variables into the equation, we have

y - y' = ut - 1/2gt²

0 - 1.2 m = (0 m/s)t - 1/2(9.8 m/s²)t²

- 1.2 m = 0 - (4.9 m/s²)t²

- 1.2 m = - (4.9 m/s²)t²

t² = - 1.2 m/- (4.9 m/s²)

t² = 0.245 s²

t = √(0.245 s²)

t = 0.49 s

Since d = vt where d = horizontal distance ball moves = 3.6 m, v = horizontal velocity of ball = unknown and t = time it takes ball to land = 0.49 s.

So, d = vt

v = d/t

= 3.6 m/0.49 s

= 7.35 m/s

Since the initial velocity of the ball is 7.35 m/s since the initial vertical velocity is 0 m/s.

It is shown thus V = √(u² + v²)

= √(0² + v²)

= √(0 + v²)

= √v²

= v

= 7.35 m/s

Answer:

the answer is .D

Explanation:

force is greater than the boats weight

Answer: The buoyant force is less than the boats weight.

Answer:

Explanation:

gauge pressure due to a liquid column of density d and height h is given by the following expression .

P = hdg

The pressure depends upon height of liquid column and not on the cross sectional area .

In first cylinder .

gauge pressure = .40 atm

hdg = .40 atm

cross sectional area of cylinder = π r²

The radius of second cylinder is twice of the first , cross sectional area will be 4 times .

The volume remains the same when the liquid is poured into second cylinder

volume = cross sectional area x height .

As cross sectional area of second cylinder is 4 times  , height of liquid column in second cylinder = h / 4 .

gauge pressure in second cylinder = h / 4 x d x g = hdg / 4

.40 / 4 = .10 atm

gauge pressure in second cylinder  = .10 atm.

Answer:

6.75233 h

Explanation:

✓airplane travels 3100km at a speed of 790km/h,

Speed= distance/ time

Time= speed/distance

Distance=3100 km

Speed=790km/h

Time= 3100 /790

= 3.924 h

✓and then encounters a tailwind that boosts its speed to 990km/h for the next 2800 km

Time= 2800 k990km/h

= 2800/990

= 2.828 h

We can calculate total times as (3.924 + 2.828)

= 6.75233 h

Answer:

8 N

Explanation:

From Newtons second law of motion, we have;

F = ma

where: F is the force applied, m is the mass of the object, and a is its acceleration.

From the given question: mass of box  = 4 kg and acceleration of the box  = 2 m/[tex]s^{2}[/tex], then;

F = 4 x 2

  = 8

F = 8 N

The amount of force to be used is 8 N.  

Explanation:

Momentum is conserved in the collision. Momentum is conserved for any interaction between two objects occurring in an isolated system.

Answer:

Ribosomes are organelles the make protein for the cell.

Answer:

a) the rotational speed of the clay is  3.45 rad/s

b) the value of A in the equation of motion is 0.15 m

c) the value of ϕi is 90° or π/2 rad.

Explanation:

 Given that;

Revolution per minute rpm = 33( 1/3) =  100/3

The frequency f = 100 / 3(60) = 0.55 Hz

a)

Rotational speed W = 2πf

we substitute

W = 2π × 0.55

W = 3.45 rad/s

Therefore, the rotational speed of the clay is  3.45 rad/s

b)

given equation; y(t)=Asin(ωt+ϕi)

given that radius = 0.15 m

y(t)=(0.2)sin(ωt+ϕi)

Therefore, the value of A in the equation of motion is 0.15 m

c)

since y(t) has the maximum value at t =0

so at t=0

y(0) = (0.15)sin(ω(0)+ϕi)

= 0.15sin(ϕi)

this will give maximum value when ϕi = 90°

so

y(0) = (0.15)sin(ω(0)+ϕi)

= 0.15sin(90°)

= 0.15

hence, the value of ϕi is 90° or π/2 rad.