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3 years ago

In which activities is speed helpful? Running track Swimming Riding in a bike race All of the above

Physics

2 answers:

Burka [1]3 years ago

6 0

Answer:

all of the above

Explanation:

they all require speed to beat

Elena L [17]3 years ago

5 0

Answer:

All of the above

Explanation:

if your taking any kind of quiz or even review and there's a choice of "all of the above" it's always right because that answer won't be on every question!

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4 years ago

Which of the following is an example of the law of conversion of energy

ruslelena [56]

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3 years ago

A rescue airplane is diving at an angle of 37º below the horizontal with a speed of 250 m/s. It releases a survival package when

alisha [4.7K]

Answer:

<em>The correct option is 1. 720 m</em>

Explanation:

<u>Projectile Motion</u>

When an object is launched in free air (no friction) with an initial speed vo at an angle $\theta$ , it describes a curve which has two components: one in the horizontal direction and the other in the vertical direction. The data provided gives us the initial conditions of the survival package's launch.

$\displaystyle V_o=250\ m/s$

$\displaystyle \theta =-37^o$

The initial velocity has these components in the x and y coordinates respectively:

$\displaystyle V_{ox}=250\ cos(-37^o)=199.7\ m/s$

$\displaystyle V_{oy}=250\ sin(-37^o)=-150.5\ m/s$

And we know the plane has an altitude of 600 m, so the package will reach ground level when:

$\displaystyle y=-600\ m$

The vertical distance traveled is given by:

$\displaystyle y=V_{oy}\ t-\frac{g\ t^2}{2}=-600$

We'll set up an equation to find the time when the package lands

$\displaystyle -150.5t-4.9\ t^2=-600$

$\displaystyle -4.9\ t^2-150.5\ t+600=0$

Solving for t, we find only one positive solution:

$\displaystyle t=3.6\ sec$

The horizontal distance is:

$\displaystyle x=V_{ox}.t=199.7\times3.6=720\ m$

The correct option is 1. 720 m

6 0

3 years ago

Which perspective believes that behavior is learned through rewards and punishments

SCORPION-xisa [38]

Behaviorism is the aspect of psychology that believes that behavior is learned through rewards and consequences. There have been many scientific studies conducted on this idea.

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3 years ago

Higher Current = ________ Moving Electric Charges (Electrons) *

Eva8 [605]

Answer:

Higher current is normally achieved by faster moving electrons.

Explanation:

Current is solely not the speed of the electric charges, but speed of the electrons is one of the factors that current depends on.

Current is the net charge flowing per unit time.

Current can be represented by:

I=v×e×N×A

where,

I= current

e= electric charge

v= speed of electrons

N=no. of free electric charges per volume

The unit of current is Ampere, represented by A. It is flow of 1 coulomb of charge in 1 second.

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3 years ago