Is this statement an observation or an inference? It must be raining outside. Explain.

Answers

Answer 1

Answer: The word must means that it is an inference. If you removed that word it would be an observation as it would mean you're seeing it.
However must implies that you can't see it and you are inferring the fact it's raining from another source, example the sound on the window.

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Will a cart rolling up and down a ramp have a faster or slower acceleration than a ball being thrown straight up into the air? (Assume up the ramp is positive and the origin is the starting point of the cart)

Answers

a ball being thrown straight up would excel faster.

A student pushes a 40-N block across the floor for a distance of 10 m. How much work was applied to move the block? A.
4 J

B.
40 J

C.
400 J

D.
4000 J

Answers

The correct answer to the question is C) 400 J.

CALCULATION:

As per the question, the force applied on the block F = 40 N.

The distance travelled by the block S = 10 m.

We are asked to calculate the work done by the block.

The work done by a body under a force F is calculated as -

Work done W = $\vec F.\vec S$

= $FScos\theta$

Here, $\theta$ is the angle between force and displacement.

If $\theta =\ 0^(0)$ , then work done W = $FScos0$

= FS. [ cos0 = 1]

Hence, the work done by the block W = FS

= 40 N × 10 m

= 400 Joule. [ans]

Here, Joule is the unit of work.

Hence, the work done by the block s 400 Joule.

the african plate is moving toward the eurasian plate at a rate of a few centimeters per year how will this area change in 100 million years in your answer , consider how the continents will change and how the mediterranean sea will change

Answers

After millions of years go bye eventually the two plates will collide making the ocean smaller and spreading around the two countries once they are together.

If a hockey puck slides on a perfectly frictionless surface, it willeventually slow down because of its inertia.

Answers

If the surface is perfectly frictionless AND level ... no ups and downs ... then the puck never slows down or stops. There's nothing to make it do so. (Notice that "perfectly frictionless" means no air resistance either.)

Mr. D needs to create a lever with a mechanical advantage of 0.4. If he is going toapply his force 2 meters from the fulcrum, how far away must his load be from the
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