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3 years ago

In the us we use the us customary units true or false

Physics

1 answer:

sergiy2304 [10]3 years ago

6 0

Answer:

true

Explanation:

i believe that's the answer hope that helps

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A concave mirror with a focal length of 32 cm produces an image whose distance from the mirror is one-third the object distance.

iVinArrow [24]

Answer:

part A ⇒ u = 1.28 m

part B ⇒v = 0.43 m

Explanation:

for u is the distance to the object from the mirror and v is the distance from the mirror to the image.

Part A:

the mirror equation is given by:

1/f = 1/v + 1/u

but we told that, v = 1/3u:

1/f = 3/v + 1/u = 4/u

1/f = 4/u

f = u/4

u = 4f

= 4×(32×10^-2)

= 1.28 m

Therefore the distance from the mirror to the object is 1.28 m.

part B:

v = 1/3×u = 1/3×(1.28) = 0.43 m

5 0

3 years ago

yo this is due tomorrow help ya girl out : if a 2kg mass is accelerating at a rate of 2m/s^2 on a frictionless surface. how much

krok68 [10]

We Know, F = m.a
Here, m = 2 Kg
& a = 2 m/s²

Substitute for it,
F = 2*2 Kgm/s²
F = 4 Kgm/s²

8 0

3 years ago

During this chemical reaction energy is released. In the chemistry lab, this would be indicated by an increase in temperature or

PtichkaEL [24]

Answer:

C) the reactants have more potential energy than the products.

Explanation:

6 0

2 years ago

Read 2 more answers

When an aluminum bar is connected between a hot reservoir at 860 K and a cold reservoir at 348 K, 2.40 kJ of energy is transferr

Natalija [7]

Answer:

a) $\Delta S_{in} = 2.791\,\frac{J}{K}$ , b) $\Delta S_{out} = 6.897\,\frac{J}{K}$ , c) $S_{gen} = 4.106\,\frac{J}{K}$ , d) Due to irreversibilities due to temperature differences.

Explanation:

a) The change in entropy of the hot reservoir is:

$\Delta S_{in} = \frac{2400\,J}{860\,K}$

$\Delta S_{in} = 2.791\,\frac{J}{K}$

b) The change in entropy of the cold reservoir is:

$\Delta S_{out} = \frac{2400\,J}{348\,K}$

$\Delta S_{out} = 6.897\,\frac{J}{K}$

c) The total change in entropy of the Universe is modelled after the Second Law of Thermodynamics. Let assume that process is steady:

$\Delta S_{in} - \Delta S_{out} + S_{gen} = 0$

$S_{gen} = \Delta S_{out} - \Delta S_{in}$

$S_{gen} = 6.897\,\frac{J}{K} - 2.791\,\frac{J}{K}$

$S_{gen} = 4.106\,\frac{J}{K}$

d) Since irreversibilities create entropy as process goes by. The main source of irreversibilities is the existence of temperature differences.

6 0

3 years ago

Unlike metals, many nonmetals are.......

timofeeve [1]

The correct is b: malleable and ductile.

7 0

3 years ago