All categories

3 years ago

Help me to solve this please

Physics

2 answers:

iris [78.8K]3 years ago

8 0

Answer:

the are are7

Explanation:

aivan3 [116]3 years ago

6 0

Answer:

2) 7

3) 5

Explanation:

You might be interested in

Two ideal gases have the same mass density and the same absolute pressure. One of the gases is helium (He), and its temperature

Oxana [17]

Answer:

Temperature of neon gas = 875 K

Explanation:

Using Ideal gas equation as:

PV=nRT

Where,

P is the pressure of the gas

V is the volume of the gas

n is the number of moles

R is the gas constant

T is the temperature

Also,

$moles=\frac{Mass(m)}{Molar\ mass (M)}$

$Density (\rho)=\frac{Mass(m)}{Volume(V)}$

The ideal gas equation can be written as:

$P=\frac{Mass(m)}{Molar\ mass (M)\times Volume(V)}\times RT$

Thus,

$P=\frac{Density (\rho)}{Molar\ mass (M)}\times RT$

$P\times M=Density (\rho)\times RT$

As Density and Pressure is constant , We only consider molar mass and Temperature which are directly proportional according to the equation above as:

$\frac {M_1}{T_1}=\frac {M_2}{T_2}$

Data given for He:

Temperature (T₁) = 175 K

Molar mass of He (M₁)= 4 g/mol

For Ne:

Temperature (T₂)= ?

Molar mass of He (M₂)= 20 g/mol

Applying in the equation,

$T_2=\frac {M_2}{T_1} \times {M_1}$

$T_2=\frac {20 g{mol}^{-1}}{175 K} \times {4 g{mol}^{-1}}$

$T_2=875 K atm$

<u>Temperature of neon gas = 875 K</u>

4 0

3 years ago

The adjustments that your eyes make as they look from objects near to objects far away or from objects far away to objects close

Hatshy [7]

Answer:

Oculomotor depth cues is based on two things convergence and accommodation,for the eyes to see near by things within 25cm near point we look inwards at this point the muscles holding the lens tighten up to see near by things unlike when we see far things we tend to look outwards with our eye muscles relaxing.

6 0

3 years ago

(This may not be Physics!!!) Why does an ice cube melt when held in someone's hand?

VLD [36.1K]

Because the heat from your hand is leaving your hand and going into the ice cube which makes it melt and since th heat is leaving your hand your hand feels cold.

6 0

4 years ago

A rock is hurled horizontally from the top of a 55 m building and lands 145 m from the base of the building. Ignore air resistan

In-s [12.5K]

Answer:

a) 3.35 s

b) 43.4 m/s

c) 32.85 m/s

d) 54.35 m/s

Explanation:

a) If we ignore air resistance, then gravitational acceleration g = 9.81 m/s2 is the only thing that generate vertical motion of the rock. We can use the following equation of motion to find out the time it travels 55m vertically with acceleration g = 9.81m/s2 and initial vertical speed = 0 m/s

$h = gt^2/2$

$55 = 9.81t^2/2$

$t^2= \frac{55*2}{9.81} = 11.2$

$t = \sqrt{11.2} = 3.35 s$

b) Since there's no air resistance, the rock horizontal velocity stays constant. For it to travel 145m horizontally within 3.35 s, its horizontal velocity must be

$v_h = 145 / 3.35 = 43.3 m/s$