Which describes what happens when a balloon is rubbed with a wool cloth?A.
Electrons move from the atoms in the balloon to the atoms in the cloth, causing the cloth to have a negative charge.

B.
Everyday objects do not have electric charges, so neither the balloon nor the cloth can gain or lose electrons.

C.
Electrons move from the atoms in the cloth to the atoms in the balloon, causing the balloon to have a negative charge.

D.
Electrons are shared equally between the atoms of the balloon and the atoms of the cloth, making both electrically neutral.

Answers

Answer 1

Answer: the correct answer would be a hope this helps :D

Answer 2

Answer: The answer is C. because when you rub the balloon on the wool the electrons move from the balloon to the wool.

Also when doing this you, can hear the static electricity which proves my point.

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The total amount of electrical energy used by a315-watt television during 30.0 minutes of
operation is
(1) 5.67 × 10^5 J (3) 1.05 × 10^1 J
(2) 9.45 × 10^3 J (4) 1.75 × 10^1 J

Answers

The amount of electrical energy used by the television is given by:

$E=Pt$

where P is the power of the device and t is the time.

The power of the television is P=315 W, while the total time is

$t=30.0 min \cdot 60 =1800 s$

If we substitute these numbers into the formula, we find the energy:

$E=Pt=(315 W)(1800 s)=5.67 \cdot 10^5 J$

so, the correct answer is

(1) 5.67 × 10^5 J

$W=Pt$
W - energy, P - power, t - time

$P=315 \ W \nt= 30 \ min= 30 * 60 \ s = 1800 \ s \n \nW=315 * 1800=567000=5.67 * 10^5 \ [J]$

The answer is (1).

What is Earth's role in the hierarchy of organization within the universe

Answers

In the hierarchy of Organization within the universe , currently Earth placed as the 3rd Planet (after Mercury and Venus) , and the only planet that provided living organisms with enough resources to live such as water, foods, breathing air, etc.

Atoms have no electric charge because theyA. Have an equal number of charged and non charged particles.

B. Have neutrons in their nuclei.

C. Have an equal number of electrons and protons

D. Have an equal number of neutrons and protons

Answers

Atoms have no electric charge because they have an equal number of electrons and protons.

Explanation:

Atom is the smallest unit of matter.

It is comprised of three subatomic particles:protons, electrons, and neutrons.
Electrons are found outside the nucleus of an atom and are negatively charged.
Protons are found inside the nucleus of an atom and are positively charged.

Neutrons are found inside the nucleus of an atom and have no charge.
They are electrically neutral because they have an equal number of protons and electrons.

So from this, we can conclude that atoms have no electric charge because they have an equal number of electrons and protons. Option C is correct.

Learn more about atoms here:

brainly.com/question/1527888?referrer=searchResults

brainly.com/question/17812123

Answer choice c is the correct choice

Heat of Fusion How much thermal energy is needed change 50.0 g of ice at -20.0°C to water at 10.0°C?

Answers

We should divide the problem into 3 separate processes.

1) Bring the temperature of the ice from $-20.0^(\circ)C$ to its melting point ( $0^(\circ)C$ ): the amount of heat needed in this process is
$Q_1=mC_s \Delta T$
where
$m=50.0 g$ is the mass of the ice
$C_s = 2.108 J/g^(\circ)C$ is the specific heat capacity of ice
$\Delta T=0^(\circ)C-(-20^(\circ)C)=20^(\circ)C$ is the increase of temperature

Plugging numbers into the equation, we find
$Q_1 = (50.0 g)(2.108 J/g^(\circ)C)(20^(\circ)C)=2108 J$

2) Fusion of ice
When the ice is at melting point, we need to add a certain amount of heat in order to melt it, and this amount of it is given by:
$Q_2 = mL_f$
where
$m=50.0 g$ is the mass of ice
$L_f = 334 J/g$ is the latent heat of fusion of ice

Plugging numbers into the equation, we find
$Q_2 = mL_f = (50.0g)(334 J/g)=16700 J$
During this phase transition, the temperature of the ice/water does not change.

3) Bring the temperature of the water from $0^(\circ)C$ to $10^(\circ)C$

The amount of heat needed for this process is
$Q_3 = mC_s \Delta T$
where
$m=50.0 g$ is the mass of water
$C_s = 4.187 J/g^(\circ)C$ is the specific heat capacity of water
$\Delta T=10^(\circ)C-0^(\circ)C=10^(\circ)C$ is the increase of temperature

Plugging numbers into the equation, we find
$Q_3 = (50.0 g)(4.187 J/g^(\circ)C)(10.0^(\circ)C)=2094 J$

--> therefore, the total energy needed for the whole process is:
$Q=Q_1+Q_2+Q_3=2108 J+16700 J+2094 J=20902 J=20.9 kJ$

A resistor is connected in series with an AC source that provides a sinusoidal voltage of v of t is equal to V times cosine of begin quantity omega times t end quantity, where V is the maximum voltage, omega is the angular frequency, and t is the time. The current supplied by this source that flows through this resistor is described with the function i of t is equal to I times cosine of begin quantity omega times t end quantity, where I is the maximum current. What is the average power supplied by this AC source?

Answers

Answer:

In circuits, the average power is defined as the average of the instantaneous power over one period. The instantaneous power can be found as:

$p(t)=v(t)i(t)$

So the average power is:

$P=(1)/(T)\intop_(0)^(T)p(t)dt$

But:

$v(t)=v_(m)cos(\omega t) \n \n i(t)=i_(m)cos(\omega t)$

So:

$P=(1)/(T)\intop_(0)^(T)v_(m)cos(\omega t)i_(m)cos(\omega t)dt \n \n P=(v_(m)i_(m))/(T)\intop_(0)^(T)cos^(2)(\omega t)dt \n \n But: cos^(2)(\omega t)=(1+cos(2\omega t))/(2)$

$P=(v_(m)i_(m))/(T)\intop_(0)^(T)((1+cos(2\omega t))/(2) )dt \n\nP=(v_(m)i_(m))/(T)\intop_(0)^(T)[(1)/(2)+(cos(2\omega t))/(2)]dt \n\nP=(v_(m)i_(m))/(T)[(1)/(2)(t)\right|_0^T +(sin(2\omega t))/(4\omega) \right|_0^T] \n \n P=(v_(m)i_(m))/(2T)[(t)\right|_0^T +(sin(2\omega t))/(2\omega) \right|_0^T] \n \n P=(v_(m)i_(m))/(2)$

In terms of RMS values:

$V_(RMS)=V=(v_(m))/(√(2)) \n \n I_(RMS)=I=(i_(m))/(√(2)) \n \n Then: \n \n P=VI$

A sled is moving at a constant speed down a surface inclined at 45.0° with the horizontal and travels 30 meters in 4 seconds. Calculate the vertical velocity of the sled at the end of 4 seconds. A) 5.3 meters/second B) 4.3 meters/second C) 9.8 meters/second D) 2.3 meters/second

Answers

Answer:

Option A is the correct answer.

Explanation:

Velocity of sled can be calculated by dividing displacement to time.

Displacement = 30 m

Time = 4s

$\texttt{Velocity, v = }(30)/(4)=7.5m/s$

Vertical velocity component is vsinθ

Vertical velocity = vsinθ = 7.5 x sin 45 = 5.3 m/s

Option A is the correct answer.

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