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enyata [817]
2 years ago
15

Anyone know how to do this?

Physics
1 answer:
Gala2k [10]2 years ago
6 0

Answer:

I think, (remember think) it might be 2.0 m/s

Explanation:

If it's wrong I'm truly sorry.

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A cylinder with a movable piston contains 2.00 gg of helium, HeHe, at room temperature. More helium was added to the cylinder an
NikAS [45]

Answer: 1.8 g

Explanation:

We start first, by calculating the amount of Helium

n = m/M

m = mass of Helium

M = molar mass if Helium

n = 2/4 = 0.5 moles

proceeding further, we use ideal gas law. PV = nRT

Then we have

P1V1/n1T1 = P2V2/n2T2

So that,

n2 = n1T1P2V2/P1V1T2

From the question, we know that, P1 = P2, and T1 = T2. So that,

n2 = n1v2/v1

n2 = (0.5 * 3.9) / 2

n2 = 1.95/2

n2 = 0.975 moles. With this, we can determine the mass, m2 of Helium

n = m/M

m = n * M

m = 0.975 * 3.9

m = 3.8

The difference between both masses are 3.8 - 2 = 1.8 g

Thus, 1.8 g of Helium was added to the cylinder

3 0
3 years ago
Read 2 more answers
A boy reaches out of a window and tosses a ball straight up with a speed of 10 m/s. The ball is 20 m above the ground as he rele
kirill115 [55]

Explanation:

It is given that,

Speed of the ball, v = 10 m/s

Initial position of ball above ground, h = 20 m

(a) Let H is the maximum height reached by the ball. It can be calculated using the conservation of energy as :

\dfrac{1}{2}mv^2=mgh'            

h'=\dfrac{v^2}{2g}

h'=\dfrac{(10)^2}{2\times 9.8}

h' = 5.1 m

The maximum height above ground,

H = 5.1 + 20

H = 25.1 meters

So, the maximum height reached by the ball is 25.1 meters.

(b) The ball's speed as it passes the window on its way down is same as the initial speed i.e. 10 m/s.

Hence, this is the required solution.                              

6 0
3 years ago
Calculate the phase angle (in radians) for a circuit with a maximum voltage of 12 V and w-50 Hz. The voltage source is connected
Vinvika [58]

Answer:

The phase angle is 0.0180 rad.

(c) is correct option.

Explanation:

Given that,

Voltage = 12 V

Angular velocity = 50 Hz

Capacitance C= 20\times10^{-2}\ F

Inductance L=20\times10^{-3}\ H

Resistance R=  50\ Omega

We need to calculate the impedance

Using formula of impedance

z=\sqrt{R^2+(\omega L-\dfrac{1}{\omega C})^2}

z=\sqrt{50^2+(50\times20\times10^{-3}-\dfrac{1}{50\times20\times10^{-2}})^2}

z=50.00

We need to calculate the phase angle

Using formula of phase angle

\theta=\cos^{-1}(\dfrac{R}{z})

\theta=\cos^{-1}(\dfrac{50}{50.00})

\theta=0.0180\ rad

Hence, The phase angle is 0.0180 rad.

3 0
3 years ago
Earthquakes usually occur on or near: cities roads fault lines lakes
vivado [14]

Answer:

Fault lines

Explanation:

Earthquakes are most likely to occur near or on fault lines. A great example of this is the ring of fire, a gigantic fault line that gives catastrophic earthquakes.

3 0
3 years ago
Read 2 more answers
Describe a situation where you add heat to a substance or material but there is no change in temperature. What does this look li
Alisiya [41]
ONE CAN perform this by doing an ideal experiment
by creating an isothermal system
its like you supply heat to a body and that body is present at very low temperature the amount of heat you supply is equal to the amount of heat lost by that body due to difference in the temperature of the body and the surrounding. heating curve will be constant as there is no change in the internal energy of the system ..
6 0
3 years ago
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