3 years ago

6. Dentists use a soft, clay-like material to make a filling for a cavity. The filling stays soft under the

1 answer:

6 0

Answer:

Ultraviolet light is a stronger type of light. The light the dentist uses is a softer light that is just used to help you see.

Explanation:

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What is the current in a 160V circuit if the resistance is 20Ω

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I =V/R

I= 160/20 = 8 Amperes

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the field of meteorology is based on studying which of the following? a.)stars and plants b.) weather and climate c.)rocks and m

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The coefficient of linear expansion of copper is 17 x 10^-6 K-1. A block of copper 30 cm wide, 45 cm long, and 10 cm thick is he

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Answer:

The change in volume is $6.885\times 10^{- 5}\$

Solution:

As per the question:

Coefficient of linear expansion of Copper, $\alpha = 17\times 10^{- 6}\ K^{- 1}$

Initial Temperature, T = $0^{\circ}$ = 273 K

Final Temperature, T' = $100^{\circ}$ = 273 + 100 = 373 K

Now,

Initial Volume of the block, V = $30\times 45\times 10\times 10^{- 6}\ m^{3} = 0.0135\ m^{3}$

$V' = V(1 + \gamma \Delta T)$

$\gamma = 3\alpha$

$V' = V(1 + 3\alpha \Delta T)$

where

V' = Final volume

$V' - V= 0.0135\times 17\times 10^{- 6} \times (T' - T))$

$\Delta V= 0.0135\times 3\times 17\times 10^{- 6} \times (373 - 273)) = 6.885\times 10^{- 5}\$

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How much work is accplished when a force of 250 n pushes a box accross the floor for a distance of 50 meters

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You just multiply these two numbers, it's 1250J

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A solid cylinder is released from the top of an inclined plane of height 0.81 m. From what height, in meters, on the incline sho

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Answer:

same 0.81m

Explanation:

in this problem if we assume there no resistance of any sort. and we apply the energy conservation

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the above relation suggests that the speed at the bottom is only depending on the height it is released from not on the shape, mass or radius.

so at the bottom

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both CYLINDER and SPHERE will have same velocity at the bottom if released from the same height irrespective of shape and size

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