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4 years ago

1. Three kids in a parking lot launch a rocket that rises

Physics

1 answer:

Mnenie [13.5K]4 years ago

3 0

Answer:

Average speed equals distance / time

380 / 40 = 9.5 m/s.

Explanation:

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A magician quickly pulls a silk tablecloth out from under a set table without disturbing the dishes and silverware placed on it.

expeople1 [14]

<h3>Answer:</h3>

the dishes and silverware are in inertia of rest

<h3>Explanation:</h3>

Newton's first law of motion is that things at rest tend to stay at rest unless acted upon by an external force.

A silk tablecloth will have a fairly slippery surface, so there is not much friction to cause tableware to be accelerated.

8 0

3 years ago

Read 2 more answers

A man 6 feet tall walks at a rate of 5 feet per second away from a light that is 15 feet above the ground. When he is 10 feet fr

harina [27]

Answer:

$\frac{25}{3}ft/s$

Explanation:

Height of man= 6ft

Height of light=1 5ft

Let BC=x and CD=y

BD=x+y

Triangle ABD and ECD are similar

When two triangles are similar then the ratio of their corresponding sides are equal

$\frac{AB}{EC}=\frac{BD}{CD}$

$\frac{15}{6}=\frac{x+y}{y}$

$\frac{5}{2}=\frac{x+y}{y}$

$5y=2x+2y$

$5y-2y=2x$

$3y=2x$

Differentiate w.r.t t

$2\frac{dx}{dt}=3\frac{dy}{dt}$

We have $\frac{dx}{dt}=5ft/s$

Substitute the value then we get

$2\times 5=3\frac{dy}{dt}$

$\frac{dy}{dt}=\frac{2\times 5}{3}=10/3ft/s$

Rate at which the tip of shadow is moving= $\frac{dx}{dt}+\frac{dy}{dt}$

Rate at which the tip of shadow is moving= $5+\frac{10}{3}=\frac{15+10}{3}ft/s$

Rate at which the tip of shadow is moving= $\frac{25}{3}ft/s$

5 0

3 years ago

10. With a class 1 lever, does mechanical advantage increase or decrease as the fulcrum is moved closer to the load? Explain why

Kitty [74]

Answer:

Class 1 Levers: Moving the fulcrum closer to the load will increase the mechanical advantage. Moving the effort farther from the fulcrum will increase the mechanical advantage.

Explanation:

Hope it helps you

3 0

3 years ago

1) A man leans against the wall and...

dolphi86 [110]

Answer:

I thinks its a, but its really about gravity im not sure

Explanation:

4 0

3 years ago

Round 61.062 to one decimal place.

RoseWind [281]

Answer: 61.1 is the answer I wish this answer help you.

3 0

4 years ago