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3 years ago

What are the physical changes on water

2 answers:

3 0

1. Ice melting involves a change from a solid to a liquid and the substances maintain the properties of water because the molecules never change. 2. Water boiling is a physical change as water molecules vibrate faster, they enter the gas phase and become water vapor.

erma4kov [3.2K]3 years ago

3 0

The physical changes is the water freezing and the water evaporating.

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Which trait would most likely lead a scientist to investigate a blood-thinning agent in the saliva of vampire bats?

zheka24 [161]

What will most likely lead a scientist to investigate a blood-thinning agent in the saliva of vampire bats is curiosity.

<h3>What is curiosity?</h3>

Curiosity is defined as an inquisitive trait which is one of the qualities of a good scientist which drives them to discover more in their field.

For a scientist to investigate a blood-thinning agent in the saliva of vampire bats would have been driven by curiosity to do so.

Learn more about blood-thinning agent here:

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2 years ago

Calculate the velocity of an apple that falls freely from rest and drops for 3.5 seconds.

padilas [110]

Answer:

initial velocity(u)=0

time(t)=3.5sec

acceleration (a)=9.8m/s²

final velocity (v)=?

Explanation:

we have

v=u+at=0+9.8×3.5=34.3m/s

6 0

2 years ago

The relationship that exists between gravity and distance and mass respectively.

ruslelena [56]

Answer:

D...............................

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3 years ago

In a real system of levers, wheels, or pulleys, the AMA is less than the IMA because _____.

pickupchik [31]

In a real system of levers, wheels, or pulleys, the AMA is less than the IMA because of friction.
AMA (Actual mechanical advantage) is found by dividing output force by effort force. The actual mechanical advantage will always be less than the ideal mechanical advantage. The ideal mechanical advantage assumes perfect efficiency which doesn't account for friction, while actual mechanical advantage does. Therefore; the IMA is always greater than the actual mechanical advantage because all machines must overcome friction.

5 0

3 years ago

Robin Hood wishes to split an arrow already in the bull's-eye of a target 40 m away.

tamaranim1 [39]

Answer:

5.843 m

Explanation:

suppose that the arrow leave the bow with a horizontal speed , towards he bull's eye.

lets consider that horizontal motion

distance = speed * time

time = 40/ 37 = 1.081 s

arrow doesnot have a initial vertical velocity component. but it has a vertical motion due to gravity , which may cause a miss of the target.

applying motion equation

(assume g = 10 m/s²)

$s=ut+\frac{1}{2}*gt^{2} \\= 0+\frac{1}{2}*10*1.081^{2}\\= 5.843 m$

Arrow misses the target by 5.843m ig the arrow us split horizontally

4 0

3 years ago