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anyanavicka [17]
3 years ago
10

What happens when you see something?

Physics
1 answer:
Elan Coil [88]3 years ago
5 0
The answer is D light rays shine on an object which then reflects back to our retina
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Distances (d)=144m<br> Time (t)=12s<br><br><br> What is the speed?
Sunny_sXe [5.5K]
Speed=distanse/time
144/12=12
ans is 12m/s
5 0
3 years ago
14) the formula k2s indicates that
Ivan
14.) c) there are two potassium ions for each ion of sulfur. 15.) b) Lithium fluoride. 16.) d) carbon-12 atom. 17.) <span>c) nonmetal fluorine.</span>
6 0
2 years ago
)If a force of 5.00 N is needed to open a 90.0 cm wide door when applied at the edge opposite the hinges, what force must be app
masha68 [24]

Answer:

A force of 12.857 newtons must be applied to open the door.

Explanation:

In this case, a force is exerted on the door, a moment is performed and the door is opened. If moment remains constant, the force is inversely proportional to distance respect to axis of rotation passing through hinges. That is:

F \propto \frac{1}{r}

F = \frac{k}{r} (Eq. 1)

Where:

F - Force, measured in newtons.

k - Proportionality ratio, measured in newton-meters.

r - Distance respect to axis of rotation passing through hinges, measured in meters.

From (Eq. 1) we get the following relationship and clear the final force within:

F_{A}\cdot r_{A} = F_{B}\cdot r_{B}

F_{B}=\left(\frac{r_{A}}{r_{B}} \right)\cdot F_{A}(Eq. 2)

Where:

F_{A}, F_{B} - Initial and final forces, measured in newtons.

r_{A}, r_{B} - Initial and final distances, measured in meters.

If we know that F_{A} = 5\,N, r_{A} = 0.9\,m and r_{B} = 0.35\,m, then final force is:

F_{B}= \left(\frac{0.9\,m}{0.35\,m} \right)\cdot (5\,N)

F_{B} = 12.857\,N

A force of 12.857 newtons must be applied to open the door.

3 0
2 years ago
A student conducted an experiment that used two rose plants to determine if a liquid formula for fertilizer was better than a dr
Serga [27]
B. it was necessary to see data from more plants before the conclusion could be accepted.
4 0
2 years ago
If I can travel 20m in 18 seconds how far can I go in 10 minutes?
kifflom [539]

Answer:

36 s

Explanation:

20 m = 18 s

10 m = ?

20 × 18 = 360÷ 10

= 36 sec

5 0
2 years ago
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