Calculate the average speed (in km/hr) of Charlie who runs to the store 4 km away in 30 mins

Answers

Answer 1
Answer: First of all . . .

-- You want to know "km / hr", so you know you'll have to divide distance by time.

-- You want "km / hr", so you know the time will have to be in hours.

     30 minutes = 1/2 hour

-- Doo da division:

                        (4 km) / (1/2 hour)

                   =    (4 over 1/2) (km/hr)

                   =    (4 times 2/1) (km/hr)

                   =          8  km/hr .

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What would be the meaning of a nonzero y intercept to a graph of total mass versus volume?

Answers

It would imply the object has some volume but 0 mass which isn't possible. Negligible masses with volumes can be considered however absolutely 0 mass really means the object doesn't exist at all. Thus, showing the graph is wrong.

The period of an ocean wave is 4 seconds. What is the waves frequency?

Answers

Frequency= 1/period
Frequency=1/4
Frequency= 0.25Hz

100 POINTS! PLEASE HELP!Write a brief explanation of what happened to the stack of blocks before and after you removed the bottom block in Part 1, in terms of forces and Newton’s laws.

Answers

Answer:

By the information given, I am not sure how the event has played out. However, using common knowledge, I can give a scenario of how it may play out.

When removing the first block (the foundation), gravity will pull the other blocks down, as the strength of gravity exceeds that of the strength of air holding it up. This means that all the blocks on top would fall.

By definition of Newton's 1st - 3rd laws, the blocks would not move unless a force is given to it (i.e., removing the bottom block, which causes gravity). Gravity would pull the other blocks downwards. This would lead to the falling of the stack of blocks.

~

Answer:

Explanation:

A stack of blocks sits in equilibrium. That means, by Newton's 1st law, all blocks will remain stationary. The weight of each block is balanced by the reaction force from the block underneath it. The bottom block experiences a reaction force equals to the total weight of all blocks from the ground.

When the bottom block is removed, there will not be any reaction force from the ground. That causes a disturbance in the equilibrium. Without the balancing reaction, the blocks will have the gravity force from their weights pulling them down. By Newton 2nd law, the unbalance force will cause the blocks to accelerate towards the ground until they all crash-land.

What is the diffrent between displesment and a distance

Answers


DISTANCE

-length of the path between two points

-doesn't have to be a straight path

-has no direction

DISPLACEMENT

-the length from the starting point to the ending point

-must be a straight path

-must have direction (north, south, east, west, up, down)

EXAMPLE-If you wanted to know the distance from your house to the park, you could say 'three blocks north and then two blocks west' but for displacement, you could just cut through houses and backyards to get to the destination.

Hope that makes some sense :)

Displacement is the difference between two points where as distance is just a signle point.

Why does the same side of the moon always face the earth?

Answers

Because the moon takes exactly precisely the same time to rotate once on its axis as it takes to revolve once in its orbit around the Earth.

A block of wood has a volume of 125 cm has a mass of 27 g. What is the density of this block ?

Answers

Answer:

27/125

(3/5)³

(0.6)³

0.216 gm/cm³ or g/cc

Explanation:

  • Given:
  • Volume = 125 cm³
  • mass: 27 grams

Here Density is actually the amount of matter present in unit volume.

  • Mathematically, rho(like p) (tapering downwards) = Mass/Volume
  • Putting, 27/125 g/cm³

0.216 g/cc