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DerKrebs [107]
3 years ago
14

Your moods is approved when you have extra stress hormones in your blood

Physics
1 answer:
jenyasd209 [6]3 years ago
5 0
Is this a true or false question?
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Which variable is changed in an experiment?
Shtirlitz [24]
C. The Independent variable

It is the variable that you manipulate, while dependent is the response.
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3 years ago
Which graph BEST represents the relationship between the potential energy and kinetic energy of a cannon ball as it flies over t
nexus9112 [7]

Answer:C

Explanation:I think sorry if it’s wrong

6 0
3 years ago
How to Answer questions 12 and 13
zubka84 [21]

12) The weight of the plane is 7.35\cdot 10^5 N

13) The lift provided by the wing is 7.35\cdot 10^5 N

Explanation:

12)

The weight of an object is equal to the force of gravity acting on the object. Near the Earth's surface, it can be calculated as

W=mg

where

W is the weight

m is the mass of the object

g is the acceleration of gravity

In this problem, we know that the mass of the plane is

m = 75 tonnes

Since 1 ton = 1000 kg, the mass in kg is

m = 75,000 kg

Also, the acceleration of gravity is

g=9.8 m/s^2

Therefore, the weight of the plane is:

W=(75,000)(9.8)=7.35\cdot 10^5 N

13)

We can solve this question by applying Newton's second law along the vertical direction of motion. In fact, the net force acting along the vertical direction must be equal to the product between the mass of the plane and the vertical acceleration:

\sum F_y = ma_y

where

\sum F_y is the net force in the y-direction

m is the mass of the plane

a_y is the acceleration in the y-direction

There are two forces acting in the vertical direction:

  • The lift L, acting upward
  • The weight W, acting  downward

So the vertical net force is

\sum F_y = L-W

And the equation becomes

L-W = ma_y

Also, we know that the plane is travelling in level flight, which means that the vertical acceleration is zero:

a_y = 0

Therefore, we get

L-W=0

And so the lift is

L=W=7.35\cdot 10^5 N

Learn more about  forces:

brainly.com/question/8459017

brainly.com/question/11292757

brainly.com/question/12978926

#LearnwithBrainly

4 0
3 years ago
Which one of the following frequencies of a wave in the air can be heard as an audible sound by the human ear?
Setler [38]

the answer is 1,000 A.

6 0
3 years ago
A 2000kg car experiences a braking force of 10000N and skids to a stop in 6 seconds. The speed of the car just before the brakes
mylen [45]

Answer:

D. 30m/s

Explanation:

According to the equation of motion

v=u +at

v = Final velocity

u = initial velocity

a = acceleration

t = time taken

Since we don't know the acceleration of the body, we will find its acceleration using newtons first law of motion F = ma

10000 =2000a

a = 5m/s²

initial velocity = 0m/s since the body starts from rest

v is what we are looking for

t = 6seconds

Substituting this datas in the formula

v = 0+ 5(6)

v = 30m/s (D)

4 0
3 years ago
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