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vredina [299]
3 years ago
9

Super Invar, an alloy of iron and nickel, is a strong material with a very Low coefficient of thermal expansion (0.20x10^-6/°C).

A 1.6-m-long tabletop made of this alloy is used for sensitive laser measurements where extremely high tolerance are required. How much will this alloy table expand along expand along its length if the temperature increase 5°C?
Physics
1 answer:
fiasKO [112]3 years ago
4 0

Answer:

The alloy table will expand by 1.6*10^-6 m along its length if the temperature increase 5°C.

Explanation:

let k be the coefficient of thermal expansion

let T be the change in temperature of the alloy table

L1 be the initial length of the table

L be the expanded length of the table

k = L/(L1*T)

L = k*L*T

  = (0.20*10^-6)(1.6m)(5)

  = 1.6*10^-6 m

therefore,The alloy table will expand by 1.6*10^-6 m along its length if the temperature increase 5°C.

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The melting point of potassium thiocyanate determined by a student in the laboratory turned out to be 174.5 oC. The accepted val
yaroslaw [1]

Answer:

0.75%

Explanation:

Measured value of melting point of potassium thiocyanate = 174.5 °C

Actual value of melting point of potassium thiocyanate = 173.2 °C

<em>Error in the reading = |Experimental value - Theoretical value|</em>

<em>= |174.5 - 173.2|</em>

<em>= |1.3|</em>

<em>Percentage error = (Error / Theoretical value) × 100</em>

<em>= (1.3 / 173.2)×100</em>

<em>= 0.75 %</em>

∴ Percentage error in the reading is 0.75%

4 0
3 years ago
17. ____ Objects with more mass have
AnnZ [28]

a. more gravity

This is the answer.

5 0
2 years ago
7) List three (3) automobile safety features currently used to minimize the risk of injury to its passengers. Relate these
r-ruslan [8.4K]
Seatbelt- strapped in egg
air bag- cushion around the egg
brakes- parachute(bag that helps the egg go down slower)
3 0
3 years ago
Fill in the table below with the properties of acids and bases.
Whitepunk [10]

Answer:

1) Acids have a sour taste , Bases have a bitter taste.

2) Acids turn blue litmus paper into red , Bases turn red litmus paper into blue.

3) Acids react with most metals to form Hydrogen gas but only a few base react with a few metals to form Hydrogen gas

4) Both will conduct electricity. Both acids & bases are good electrolytes. Strong acids & bases conduct more electricity than that of weak acids & bases

5 0
3 years ago
A driver in a 2290-kg car car traveling at 42.7 m/s slams on the brakes and skids to a stop. If the coefficient of friction betw
8_murik_8 [283]

Answer:

126.56 m

Explanation:

Applying,

-F = ma............. Equation 1

Where F = frictional force, m = mass of the car, a = acceleration.

Note: Frictional force is negative because it act in opposite direction to motion

But,

F = mgμ.......... Equation 2

Where g = acceleration due to gravity, μ = coefficient of friction

Substitute equation 2 in equation 1

-mgμ = ma

a = -gμ.............. Equation 3

From the question,

Given: μ = 0.735

Constant: 9.8 m/s²

Substitute these values in equation 3

a = -9.8×0.735

a = -7.203 m/s²

Finally,

Applying

v² = u²+2as.............. Equation 4

Where v = final velocity, u = initial velocity, s = distance

From the question,

Given: u = 42.7 m/s, v = 0 m/s (to a stop), a = -7.203 m/s²

Substitute these values into equation 4

0² = 42.7²+2(-7.203)s

-1823.29 = -14.406s

s = -1823.29/-14.406

s = 126.56 m

4 0
3 years ago
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