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3 years ago

Which question about dogs could be answered through scientific investigation?

Physics

2 answers:

sertanlavr [38]3 years ago

8 0

B because the rest are not

o-na [289]3 years ago

4 0

Answer:

Explanation:

because it is an investigation that shows a hypothesis

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What percentage of the takeoff velocity did the plane gain when it reached the midpoint of the runway? a plane accelerates from

ElenaW [278]

When is at the end of the runway the velocity of the plane is given by the equation $vf^{2}=0+2*a*s$ where s=1800 m is the runway length. Thus
$vf^{2}=2*5*1800=18000 (m/s)^{2}$
$vf =134.164 (m/s)$

At half runway the velocity of the plane is
$v^{2}=2*5* \frac{1800}{2}=9000 ( \frac{m}{s} )^{2}
$
$v= \sqrt{9000}=94.87 ( \frac{m}{s})$

Therefore at midpoint of runway the percentage of takeoff velocity is
‰ $P= \frac{v}{vf}= \frac{94.87}{134.164}=0.707$

6 0

3 years ago

two forces A and B act on an object in opposite directions. A is bigger than B. What is the net force acting on an object?

Akimi4 [234]

Imagine a block with A pulling one way and B the other.

If A is bigger than B then obviously it will go in the direction of A.

The net force will be A-B as A is pulling it along with x but b is also pulling back with y.

4 0

3 years ago

Read 2 more answers

How does frequency and pitch affect sound

aleksandr82 [10.1K]

The word that musicians use for frequency is pitch. The shorter the wavelength, the higher the frequency, and the higher the pitch, of the sound. In other words, short waves sound high; long waves sound low.

7 0

3 years ago

12. If a built-up charge isn't moving, we call it?

daser333 [38]

Answer:

When touching metal doorknobs, for example; electrons can jump and give you electric shocks. Static charges build up on clouds untl the cant hold any more charges, at that point, lightning can occur. The study of electricity is where charges are not moving, and this is called electrostatics

Explanation:

3 0

3 years ago

The tires of a car make 60 revolutions as the car reduces its speed uniformly from 95.0 km/h to 60.0 km/h. The tires have a diam

yawa3891 [41]

Answer:

-2.869 rad/s2

Explanation:

Data given:

speed, vi at 95.0 km/h = 95 X (1 hour /3600 seconds) X (1000m / 1km)

Note that, for every 1 hour, there will be 60sec X 60sec = 3600 seconds

And for every 1km, there will be 1000m.

So, speed of 95.0 km/h = 26.389 m/s

speed, vi = r ω (radius X angular velocity)

angular velocity, ωi = v/r

ωi = 26.389 m/s ÷ half of 0.88 m diameter

= 59.975 rad/s

decelerating to speed, vf at 60.0 km/h = 60 X X (1 hour /3600 seconds) X (1000m / 1km)

= 16.667m/s

The angular velocity for this speed = 16.667m/s ÷ half of 0.88 m diameter

= 37.879rad/s

How far the car goes is equivalent to the angular acceleration which equals to (ωf^2 - ωi^2) ÷ 2θ

= (37.879rad/s)^2 - (59.975 rad/s)^2 ÷ 2 (60 rev X 2π rad/rev)

= -2.869 rad/s2

4 0

3 years ago