Answer:
Justin ! Justin ! ! You're in high school Physics. You've done Newton's Laws until you saw them in your sleep. When the wind rustles through the trees, you almost hear it whispering to you "F = M A". Now is the time to use that ! M=65kg. A=0.3m/s^2. F = (65)(0.3)=19.5 newtons.

Which statement is true about a polarized object? A) It gains electrons and becomes negatively charged. B) It gains protons and becomes positively charged. C) The number of positive and negative charges can be the same. D) It has to be a metal. E) There is no change in the distribution of the charge in the object.

Given the diamond shape of a baseball field in the speed of which baseballs or hit why is it harder for a hitter to hit a homerun to the center field then to the right or left field

For Most Substances the distance between particles is smallest when the substancea.exists gas b.exists as a liquid c.exists as a crystalline solid d.exists as an amorphous solid

What is the mass of a falling rock if it produces a force of 147 N with an acceleration of 9.8 m/s2?

If We Start With 400 Atoms of a Radioactive Substance, How Many Would Remain After One Half-life ?

Given the diamond shape of a baseball field in the speed of which baseballs or hit why is it harder for a hitter to hit a homerun to the center field then to the right or left field

For Most Substances the distance between particles is smallest when the substancea.exists gas b.exists as a liquid c.exists as a crystalline solid d.exists as an amorphous solid

What is the mass of a falling rock if it produces a force of 147 N with an acceleration of 9.8 m/s2?

If We Start With 400 Atoms of a Radioactive Substance, How Many Would Remain After One Half-life ?

The spread of waterborne diseases.

Death of aquatic life.

Reduced and low quality crop yields.

Death of aquatic life.

Reduced and low quality crop yields.

observable

provable

readable

In my opinion, the correct answer from the choices listed above would be the second option. When using science to investigate physical phenomena, the event should be observable. Hope this answers the question. Have a nice day. Feel free to ask more questions.

**The answer is:**

**When using science to investigate physical phenomena, observable must exist.**

**The explanation:**

In physics, an observable is a dynamic variable that can be measured. Examples include position and momentum. ... In quantum physics, it is an operator, or gauge, where the property of the system state can be determined by some sequence of physical operations.

This is a conservation of energy problem. E0=E1

Energy initial = mgh

Energy final = KE = 1/2mv^2

Energy initial = mgh

Energy final = KE = 1/2mv^2

If the **deflection **of the spring is **doubled**, the **force** exerted by the spring will also be doubled.

The relationship between the deflection of a spring and the force it exerts is described by **Hooke's Law**, which states that the force exerted by a spring is directly **proportional **to its **deflection**. Mathematically, this can be expressed as:

F = kx

where F is the **force **exerted by the spring, x is the deflection of the spring, and k is the **spring constant**, which represents the **stiffness **of the spring.

If we **double **the deflection of the spring, then x becomes 2x, and the force exerted by the spring becomes:

F = k(2x) = 2kx

Thus, if the **deflection **of the spring is doubled, the **force **exerted by the spring will also be **doubled **(assuming the spring constant remains constant).

Learn more about the **deflection **here:

#SPJ6

**Answer:**

The force is doubled as well.

**Explanation:**

If you double the spring then the force doubles as well.

Well, you see, I don't think Alana really is the reference frame.

Call me paranoid, but I think you changed the reference frame

during the question, and didn't tell us.

In which reference frame is the 19 km/hr measured ?

It CAN'T be Alana's reference frame. Your own reference

frame moves along with you, and you can't move in it, even

if your name is Alana.

If Alana is the reference frame, and she throws the tennis ball

at 11 km/hr, then the speed of the ball is 11 km/hr in Alana's

reference frame. Her reference frame moves with her, so

it makes no difference how fast she is skateboarding in any

other reference frame, who she throws the ball at, or whether

or not he sees it coming and catches it.

Yes, this stuff can get confusing. And if you think it's bad now,

wait till you start reading some of Prof. Einstein's stuff, where

two people in the same reference frame can watch the same

tennis ball, and not even agree on how fast it's moving, because

THEY're both moving and their own motion makes their rulers

and clocks change ! So they measure different speeds, and

they're both right !

But I got distracted. I'm sorry. The point I'm trying to make,

right now when you're just starting to learn reference frames,

is that EVERY time you say a speed, you have to tell which

reference frame the speed is in. Because, as you're starting

to learn, the same object can have a different speed in every

reference frame.

And, just in case you're thinking about this later today

and you want to ask "Which one is the REAL speed ?" . . .

THAT's the whole point of learning about reference frames !

There is NO SUCH THING as REAL speed. It ALWAYS

depends on which reference frame it's measured in. They're

all different, they're all real, and they're all correct.

The first thing we must do for this case is to define a frame of reference.

We know that, the frame of reference for this case is Alana.

Therefore, the tennis ball has a speed relative to Alana.

The speed relative to Alana, is the same speed with which Alana throws the tennis ball.

Therefore, the speed of the tennis ball is:

v = 11 Km/h

**Answer:**

**The speed of the tennis ball is:**

**v = 11 Km/h**

A snail can move **approximately **0.30 meters per minute then it would cover 4.5 meters in 15 minutes.

The total distance covered by any object per **unit **of time is known as speed. It depends only on the magnitude of the moving **object**. The unit of **speed **is a meter/second. The generally considered unit for speed is a meter per second.

As given in the problem a snail can **move **approximately 0.30 meters per **minute **and we have to calculate the distance covered in 15 minutes.

speed of the snail = 0.30 meters per minute

time = 15 minutes

**distance **covered by the snail = speed ×time

distance covered by the snail = 0.30 ×15

distance covered by the snail = 4.5 meters

Thus, the distance covered by the **snail **in the 15 minutes would be 4.5 meters.

Learn more about **speed** from here,refer to the link ;

#SPJ2

distance = velocity (or speed) x time

so, distance = 0.30 meters.min x 15 mins

distance =**4.5 meters **

so, distance = 0.30 meters.min x 15 mins

distance =