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3 years ago

What is an astronomical unit?

Physics

1 answer:

il63 [147K]3 years ago

8 0

Answer: The average distance between the Earth and the Sun

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A toy cart moves with a kinetic energy of 30 J. If its speed is doubled, what is its kinetic energy?

klio [65]

Explanation:

KE is directly proportional to the square of velocity / speed.

if speed is 2 times (doubled) the KE will be

${2}^{2}$

= 4 times the original KE

$4 \times (30)$

$= 120 \: j$

8 0

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

element x has five valence neutrons, element y has one valence electron and element z has one valence electron. which two of the

nikitadnepr [17]

I assume the element has 5 valence electrons (not neutrons). The similar properties are shared between y and z since they have the same number of valence electrons. This is what is primarily responsible for chemical behavior.

7 0

3 years ago

Ken wants to jump and have some fun too! Barbie loans Ken her bungee cord. Is this a good idea? Explain with evidence and reason

skelet666 [1.2K]

Answer:

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4 0

3 years ago

Read 2 more answers

A wire with a current of 5.2 A is at an angle of 45° relative to a magnetic field of 0.87 T. What is the force exerted on a 1.2

julsineya [31]

Answer:

F = I L X B = I L B sin theta

F = 5.2 * 1.2 * .87 sin 45 = 3.84 N in the direction of (L X B)

Note: L and B must be at right angles for F = I L B

7 0

3 years ago