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4 years ago

If the dartboard below is used to model an atom, which subatomic particles would be located at Z? *

Physics

1 answer:

Anna11 [10]4 years ago

7 0

I know that protons and neutrons are located at the center of an atom, so the correct answer is D

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The entropy of an isolated system must be conserved, so it never changes.a. Trueb. Fasle

Snowcat [4.5K]

Answer:

B: False

Explanation:

The second law of thermodynamics states that: the entropy of an isolated system will never decrease because isolated systems always tend to evolve towards thermodynamic equilibrium which is a state with maximum entropy.

Thus, it means that the entropy change will always be positive.

Therefore, the given statement in the question is false.

6 0

3 years ago

A hot-air balloon is descending at a rate of 2.1 m/s when a passenger drops a camera. If the camera is 42 m above the ground whe

zysi [14]

Answer:

a) 2.7s

b) 29 m/s

Explanation:

The equation for the velocity and position of a free fall are the following

$v=v_{0}-gt$ -(1)

$x=x_{0}+v_{0}t-gt^{2}/2$ - (2)

Since the hot-air ballon is descending at 2.1m/s and the camera is dropped at 42 m above the ground:

$v_{0}=-2.1m/s$

$x_{0}=42m$

To calculate the time which it takes to reach the ground we use eq(2) with x=0, and look for the positive solution of t:

$t = \frac{1}{84}(2.1\pm\sqrt{2.1^{2} - 4\times42\times9.81/2} )$

t = 2.71996

Rounding to two significant figures:

t = 2.7 s

Now we calculate the velocity the camera had just before it lands using eq(1) with t=2.7s

$v=-2.1-9.81*(2.71996)$

v = -28.782 m/s

Rounding to two significant figures:

v = -29 m/s

where the minus sign indicates the downwards direction

3 0

4 years ago

What are two properties that lead to ElectroMagnetic Interactions? please help this is due very soon!!!

melisa1 [442]

Answer:

Electric charge. A fundamental property that leads to the electromagnetic interactions among particles that make up matter.

7 0

3 years ago

Oxygen at 50 lbf/in.2, 200 F is in a piston/cylinder arrangement with a volume of 4 ft3. It is now compressed in a polytropic pr

Ksju [112]

Answer:

The value of heat transfer during the process Q = - 29.49 KJ

Explanation:

Given data

$P_{1}$ = 50 $\frac{lbf}{in^{2} }$ = 344.7 k pa

$V_{1} = 4 ft^{3}$ = 0.113 $m^{3}$

$T_{1} = 200$ F = 366.4 K

$T_{2} = 400 F$ = 477.6 K

Poly tropic index n = 1.2

gas constant for oxygen = 0.26 $\frac{KJ}{kg K}$

From ideal gas equation

$P_{1}$ $V_{1}$ = m R $T_{1}$

Put all the values in above equation we get

⇒ 344.7 × 0.113 = m × 0.26 × 366.4

⇒ m = 0.408 kg

Heat transfer in poly tropic process is given by

Q = $\frac{\gamma - n}{( \gamma - 1)( n - 1)} [ {m R (T_{1} - T_{2} ) ]$

Put all the values in above formula we get

⇒ Q = $\frac{1.4 - 1.2}{( 1.4 - 1)( 1.2 - 1)} [ {m R (T_{1} - T_{2} ) ]$

⇒ Q = 2.5 × 0.408 × 0.26 × ( 366.4 - 477.6 )

⇒ Q = - 29.49 KJ

This is the value of heat transfer during the process & negative sign shows that heat is lost during the process.

3 0

4 years ago

What is the lewis dot structure of Na+

SpyIntel [72]

The dots in the Lewis dot structure symbolize an atom's elements.
Since Na^+ is a positive ion (cation) with a charge of +1, it indicates that it has lost an electron. 
Since Na had one electron, to begin with, and it is now lost, Na^+ will have no dots. However, the charge must still be written as a superscript. 
Therefore, the Lewis dot structure for Na^+ is just Na^[+]

5 0

3 years ago