Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not?A.Helium has no mass, but air does.
B.Helium increases the balloon's mass more than air.
C.Helium has a higher density than air.
D.Helium has a lower density than air.

Answers

Answer 1

Answer:

Compared to the air the density of helium gas is very less. The less dense helium will float on air. That's why balloon filled with He gas rise in air.

What is helium?

Helium is 2nd element in periodic table. It is a non-metal and is placed with the noble gases because it is having fully filled electronic configuration leading to the stability.

Density of a substance is the ratio of its mass to the volume. When a substance is less dense than the fluid on which it occupy, it will float on the fluid. If it is more denser it will sink on it.

The density of helium is very much lower than that of air. Therefore, the balloon filled with helium gas will rise in the air, while the balloon with filled with air does not.

Find more on helium :

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Answer 2

Answer: i think the answer should be D.

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The noble gases are the least what of any elements on the periodic table

Answers

The noble gases are the least reactive elements.

While digging in the backyard, you find an old coin. It’s mass is 26.76 g and it’s volume is 3 cm . What is the density?

Answers

Considering the definition of density, the density of the old coin is 8.92 $(g)/(cm^(3) )$ .

It is neccesary to know that density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, Density is a quantity that allows us to measure the amount of mass in a certain volume of a substance, that is, density is the relationship between the mass of a substance and the volume it occupies.

Mathematically, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

$density=(mass)/(volume)$

In this case, you know:

mass= 26.76 g
volume= 3 cm³

Replacing in the definition of density:

$density=(26.76g)/(3cm^(3) )$

Solving:

density= 8.92 $(g)/(cm^(3) )$

The density of the old coin is 8.92 $(g)/(cm^(3) )$ .

Learn more about density:

Density = mass/volume

26.76/3 = 8.92

The density is 8.92

Can lunar eclipses only be found in the fall?

Answers

A solar eclipse or lunar eclipse can occur at any moment of any day of the year.

Use the drop-down menus to complete the statement.If an electric circuit has 0 A of current running through it, then the
A. charge B. resistance C. Voltage
must be
A. Negative
B. Zero
C. Positive

Answers

If an electric circuit has zero Ampere (0A) of current running through it, then the voltage must be zero.

Ohm's law states that the current flowing through an electric circuit is directly proportional to the voltage (potential difference) applied across the two terminals of an electric circuit and inversely proportional to the resistance in the electric circuit, at a constant temperature.

This ultimately implies that, the value of voltage (potential difference) is highly dependent on the value of the current running through an electric circuit.

Mathematically, Ohm's law is given by this formula;

$V=IR$

Where:

V is the voltage measured in Volts.

I is the current measured in Amperes.

R is the resistance measured in Ohms.

In conclusion, if an electric circuit has zero Ampere (0A) of current running through it, then the voltage must be zero.

Read more on Ohm's law here: brainly.com/question/796939

Answer:

1. Option C: Voltage

2. Option B: Zero

Explanation:

According to Ohm's law, the current in a circuit is directly proportional to the voltage. This means, when there is potential difference across the two ends of a circuit, then only current flows.

I ∝ V

$I = (V)/(R)$

If the given circuit has 0 A current, it means that either potential is zero or resistance is infinite. Practically, we cannot have infinite resistance. This means that the voltage must be zero.

a rectangular coil of 25 loops is suspended in a field of 0.20wb/m2.the plane of coil is parallel to the direction of the field the dimensions of the coil are 15cm perpendicular to the field line and 12cm parallel to them what is the current in the coil if there is a torque of 5.4N.M acting on it

Answers

Answer:

The current in the coil is 60 Ampere.

Explanation:

Given:

Number of turns in the coil is N = 25

Dimension of the coil = 15cm X 12cm

magnitude of magnetic field = 0.20T

angle in the xy plane is θ = 0 degree

torque τ = 5.4 N-m

To find:

current in the coil is i = ?

Solution:

The torque acting on the coil is given by

=> $\tau = NiAB cos\theta$

Converting cm to m

12 cm = 0.12 m

15 cm = 0.15 m

The area of the coil is

A = 0.12 X 0.15

A = $0.018 m^2$

Substituting the values

=> $5.4 = 25* i * 0.018 * 0.20 * cos\theta$

=> $5.4 = 25* i * 0.018 * 0.20 * cos(0)$

=> $5.4 = 25* i * 0.018 * 0.20 * 1$

=> $5.4 = 0.09* i$

=> $i = (5.4)/(0.09)$

=> i = 60 A

When the pressure at the bottom of a submerged object is _______than the pressure at the top of the submerged object a buoyant force is produced?THE ANSWER IS: GREATER THAN