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riadik2000 [5.3K]
3 years ago
5

The amount of heat needed

Physics
1 answer:
Masteriza [31]3 years ago
4 0
J=joules, c=specific heat, q= energy, and the Tf and Ti are the final and initial temperatures cause I couldn't find a delta sign.

Q=mc(T_{f}-T_{I})  \\ 33000j=2kg*c*80 \\\frac{33000j}{2kg*80} =c \\ c=206.25jkg^{-1}
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A sprinter begins from rest and accelerates at the rate of 2 m/s^2 for 200 m.
Elanso [62]

Answer:

a. 28.28

B.14.4

C.14.4

Explanation:

A. v^2=u^ + 2as

v^2=0^2 + 2*2*200

B. v=u+at

t=v-u/a

C. V+u/2

5 0
3 years ago
A number of compounds containing the heavier noble gases, and especially xenon, have been prepared. One of these is xenon hexafl
aalyn [17]

Answer:

The answer is "82.2 torr"

Explanation:

moles of Xe:

= \frac{0.06}{131.293} \\\\ =0.00045699313 \ \mol

moles of F_2:

= \frac{0.0274}{38} \\\\= 0.00072105263\ \  mol

moles of produced XeF_2:

= 0.00024

moles of left Xe:

= 0.00021

Calculate the Pressure:

= \frac{(0.08206\times 0.00024 \times 293)}{(.1)}   + \frac{(0.08206\times  0.00021 \times  293)}{(.1)} \\\\= 0.10819611 \ \ atm \\\\ = 0.10819611 \times  760 \\\\ = 82.2 \ \ torr

5 0
3 years ago
A 1.2 m long wave travels 11.2 m to a wall and back again in 4.0 s. What is
algol [13]

Answer:

   f = 4.67 Hz

Explanation:

We can approximate the wave as a traveling wave, therefore the speed of the wave is constant

          v = d / t

the total distance remember, in going to the wall and back is

          d = 2 11.2 = 22.4 me

we substitute

          v = 22.4 / 4.0

          v = 5.6 m / s

now we can use the relationship between the speed of the wave, its wavelength and u frequency

          v =λ f

          f = v /λ

          f = 5.6 / 1.2

          f = 4.67 Hz

3 0
3 years ago
How many photons are absorbed during the dental x-ray?
MariettaO [177]
<span>E=hc/wav. len
E = (6.62 x 10^-34 x 3 x 10^8)/0.0275 x 10^-9
E = 7.22182 x 10^-15 J
To convert to eV divide by 1.6 x 10^-19
E = 7.22182 x 10^-15/1.6 x 10^-19 eV
E =45.36 x 10^3 eV
Th energy, E, of a single x-ray photon in eV is = 45.36keV.

Number of photons, n = total energy/ energy of photon
n = 3.85 x 10^-6/7.22182 x 10^-15
n = 5.33 x 10^8 photons </span>
8 0
3 years ago
Is momentum proportional or inversely proportional to mass?
aivan3 [116]

Answer:In terms of an equation, the momentum of an object is equal to the mass of the object times the velocity of the object. where m is the mass and v is the velocity. The equation illustrates that momentum is directly proportional to an object's mass and directly proportional to the object's velocity.

Explanation:

3 0
3 years ago
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