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igor_vitrenko [27]
3 years ago
7

Why does the lens need to be thicker for viewing nearby objects?

Physics
1 answer:
Maurinko [17]3 years ago
5 0

Answer: To focus on a near object – the lens becomes thicker, this allows the light rays to refract (bend) more strongly. To focus on a distant object – the lens is pulled thin, this allows the light rays to refract slightly.

Explanation:

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A race car accelerates uniformly at 14.2 m/s2. If the race car starts from rest how fast will it
Kaylis [27]

Answer:

vf=94.4 m/s

Explanation:

acceleration is the final velocity minus initial velocity divided by time

a = (vf-vi)/t

Given:

a= 14.2 m/s^2

vi= 0 (at rest)

t = 6.6

Solve for vf

a = (vf-vi)/t

a*t=vf-vi

(14.2)*(6.6)=vf - 0

vf=94.4 m/s

6 0
3 years ago
A fountain can hold 53,000 deciliters of water. how many kiloliters is this ?
zubka84 [21]
5.3 kiloliters is how much water a fountain can hold.
3 0
4 years ago
True or false: Waves transfer matter as they travel.
Natalija [7]

Answer: false

Explanation: hope that helped

4 0
3 years ago
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A concrete highway is built of slabs 12 m long .How wide should be the expansion cracks between the slabs at 15 Celsius to preve
morpeh [17]

Answer:

x=4.2\ mm

Explanation:

Given:

  • length of the concrete slab, l=12\ m
  • temperature of observation, T_o=15^{\circ}C
  • we've the coefficient of linear expansion for concrete, \alpha=10^{-5}\ ^{\circ}C^{-1}
  • lower temperature limit, T_l=-30^{\circ}C
  • upper temperature limit, T_u=50^{\circ}C

<u>Change in length due to temperature can be  given as:</u>

\Delta l=l.\alpha.(T_u-T_l)

\Delta l=12\times 10^{-5}\times (50-(-30))

\Delta l=0.0096\ m=9.6\ mm

<u>Now at temperature 15°C:</u>

\Delta l'=12\times 10^{-5}\times (15-(-30))

\Delta l'=0.0054\ m=5.4\ mm

Hence the expansion crack between the slabs at this temperature must be:

x=\Delta l-\Delta l'

x=9.6-5.4

x=4.2\ mm

3 0
3 years ago
A skier reaches the end of a 0.9 km track in 1.5 hours, at what speed does it travel?
Wewaii [24]

Speed = Distance/Time

S = D/T

D = 0.9Km, T = 1.5hours,

S = 0.9/1.5

S = 0.6 m/s

hope it helps!

7 0
4 years ago
Read 2 more answers
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