Select all the correct answers.
A worker is holding a filled gas cylinder still. Which two sentences are true about the energy of the filled gas cylinder?
It has no energy because it's being held still
it has gravitational potential energy because of its height
its atoms and molecules have thermal energy
it has motion energy because it will fall if let go
its kinetic energy is being converted to potent energy

Answer: D

Explanation:

Atomic weight is measured by adding the number of protons and neutrons in an atom's nucleus. Argon's atomic number is 18 while potassium's is 19. This means that Argon will always have 18 protons while potassium will always have 19 protons.

To make the numbers easier to work with, round each atomic weight. We'll say the atomic weight of potassium is 39 and the atomic weight of argon is 40. To see how many neutrons each one has, I can set up a simple equation for each using the following equation:

Atomic weight = protons + neutrons

Potassium:

39 = 19 + N  -->  N = 20

Argon:

40 = 18 + N  -->  N = 22

An atom is defined by the number of protons it has, but the number of neutrons can vary. We call these isotopes, or atoms with the same number of protons but a different number of neutrons. As the math shows, argon typically has more neutrons per atom than potassium does.

Answer:

0.0299 N

Explanation:

Applying,

F = Gmm'/r²................... Equation 1

Where F = gravitational force between the boulders, m = mass of the first boulder, m' = mass of the second boulder, r = distance between the boulders, G = Universal constant.

From the question,

Given: m = 7.5×10⁶ kg, m' = 9.2×10⁵ kg, r = 124 m

Constant: G = 6.67×10⁻¹¹ Nm²/kg²

Substitute these values into equation 1

F = (6.67×10⁻¹¹× 7.5×10⁶ × 9.2×10⁵ )/124²

F = (460.23)/15376

F = 0.0299 N

Answer:

0.3 N

Explanation:

Plug in all your variables:

6.67 ⋅ 10^-11 (7.5 ⋅ 10^6) (9.2 ⋅ 10^5)

                    --------------------------------

                                 (124)^2

Once you plugin, You start to multiple solving to solve your problem:

460.23

----------      = 0.02993171 N

15376

Now Simplify:

Answer = 0.03 N

Explanation:

Answer:

A Chemical Reaction towards Oxygen, Water, and the Chemical Color.

Answer:

Acceleration = 5.3645 m/s²

Explanation:

Given the following data;

Initial velocity, u = 0mph

Final velocity, v = 60 mph

Time, t = 5 seconds

To find the acceleration (also used in the second law of motion), we would use the following formula;

A = (v - u)/t

Conversion:

Miles per hour to meters per seconds;

0 mph = 0 mps

1 mph = 0.44704 mps

60 mph = 60 * 0.44704 = 26.8224 mps

Next, we find the acceleration;

Acceleration = (26.8224 - 0)/5

Acceleration = 26.8224/5

Acceleration = 5.3645 m/s²

Answer:

53.64 m/s

Explanation:

Applying,

a = (v-u)/t............. Equation 1

Where a = acceleration of the car, v = final velocity of the car, u = initial velocity of the car, t = time.

make u the subject of the equation

u = v-at............. Equation 2

From the question,

Given: a = -12 mph/s = -5.364 m/s², t = 10 seconds, v = 0 m/s (comes to stop)

Substitute these values into equation 2

u = 0-(-5.364×10)

u = 0+53.64

u = 53.64 m/s

Hydrogen is a very reactive gas, and the alkali metals are even more reactive. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements.

Answer:

Explanation:

true

Answer:

Explanation:

Since the forces oppose each other (direction), the smaller is subtracted from the larger. The net force is

Fn = 100 - 40 = 60

Part B

Fn = m * a

a = 3.5 m/s^2

Fn = 60

60 =  m * a

60 = m * 3.5           Divide by 3.5

60/3.5 = m

m = 17.143

Answer: 2.925

Explanation: :)

Answer:

2.925

Explanation:

Answer:

The Challenges of Using Natural Resources

Extracting, processing and using natural resources can cause environmental problems such as: air, land and water pollution; disruption or destruction of ecosystems; and a decrease in biodiversity.

Answer:

θ = 39.8°

Explanation:

Her, we will use the trigonometric ratio of the tangent to find the launch angle of the projectile from the vertical:

[tex]tan\ \theta = \frac{v_y}{v_x}[/tex]

where,

θ = launch angle from the vertical = ?

vy = vertical component of velocity = 5 m/s

vx = horizontal component of velocity = 6 m/s

Therefore,

[tex]tan\ \theta = \frac{5\ m/s}{6\ m/s}\\\\\theta = tan^{-1}(0.8333)[/tex]

θ = 39.8°

Answer:

[tex]v = u + at (upward)\\ 0 = 45 \sin(20) - 9.81t \\ t = 1.56s[/tex]

Explanation:

Newton's law of universal gravitation states that the force of gravity affects everything with mass in the universe. Newton's law also states that the strength of gravity between any two objects depends on the masses of the objects and the distance between them

Answer:

[tex]\boxed {\boxed {\sf 2.1 \ kilograms}}[/tex]

Explanation:

Kinetic energy is the energy an object possesses due to motion. The formula 1/2 the product of mass and the squared velocity.

[tex]E_k=\frac{1}{2} mv^2[/tex]

We know the baseball's kinetic energy is 105 Joules. It is also traveling at a velocity of 10 meters per second. `

First, convert the units of Joules to make unit cancellation easier later in the problem. 1 Joule (J) is equal to 1 kilogram square meter per square second (kg*m²/s²). The baseball's kinetic energy of 105 J is equal to 105 kg*m²/s².

Now we know 2 values:

Substitute these values into the formula.

[tex]105 \ kg*m^2/s^2= \frac{1}{2} m (10 \ m/s)^2[/tex]

Now we need to solve for m, the mass. Solve the exponent.

[tex]105 \ kg *m^2/s^2 = \frac{1}{2} m (100 \ m^2/s^2)[/tex]

Multiply on the right side.

[tex]105 \ kg *m^2/s^2 = m (\frac{1}{2} * 100 \ m^2/s^2)[/tex]

[tex]105 \ kg *m^2/s^2 = m (50 \ m^2/s^2)[/tex]

The variable, m, is being multiplied by 50 square meters per square second. The opposite of multiplication is division, so we divide both sides by that value.

[tex]\frac {105 \ kg *m^2/s^2 }{50 \ m^2/s^2}= \frac{ m (50 \ m^2/s^2)}{50 \ m^2/s^2}[/tex]

[tex]\frac {105 \ kg *m^2/s^2 }{50 \ m^2/s^2}= m[/tex]

The units of square meter per square second will cancel out.

[tex]\frac {105 }{50} \ kg= m[/tex]

[tex]2.1 \ kg=m[/tex]

The mass of the baseball is 2.1 kilograms.

Answer:

Q = 231.6 J

Explanation:

Given that,

Mass, m = 3 g

The temperature rises from 20°C to 220°C.

We know that, the specific heat of copper is, c = 0.386 J/g K

We know that the energy transferred in heating of copper is given by :

[tex]Q=mc\Delta T\\\\Q=3\times 0.386\times (220-20)\\\\Q=231.6\ J[/tex]

So, the required energy is equal to 231.6 J.

3) The answer is (b) -8 m/s (pointing down)

4) The answer is (c) -9.8 m/s^2 (acceleration of a freely falling object is always due to gravity, -9.8 m/s^2, regardless of direction)

The period of a pendulum is independent of the mass of the bob so whether it's empty or filled with something, the period remains the same.

[tex]period = 2\pi \sqrt{ \frac{length}{g} } [/tex]

Answer:

F' = 2F

Explanation:

The gravitational force of attraction between asteroids is given by Newton's Law of Gravitation:

[tex]F = \frac{Gm_1m_2}{r^2}[/tex]

where,

F = Force

G = Universal Gravitational Constant

m₁ = m₂ = m = mass of each asteroid

r = distance between asteroids

Therefore,

[tex]F = \frac{Gm^2}{r^2}[/tex]   --------------------- eq(1)

Now, if we double the mass of one asteroid:

[tex]F' = \frac{G(2m^2)}{r^2} \\\\F' = 2\frac{Gm^2}{r^2}[/tex]

using equation (1):

F' = 2F

Answer:

n = 1.6

Explanation:

The formula for the calculation of the absolute index of refraction is given as follows:

[tex]n = \frac{c}{v}[/tex]

where,

n = index of refraction

c = speed of light in vacuum = 3 x 10⁸ m/s

v = speed of light in the piece of plastic = 1.87 x 10⁸ m/s

Therefore,

[tex]n = \frac{3\ x\ 10^8\ m/s}{1.87\ x\ 10^8\ m/s}[/tex]

n = 1.6

Answer:

the average velocity of the ball is 5 m/s.

Explanation:

Given;

initial position of the ball, x₁ = 12 m East

final position of the ball, x₂ = 8 m West

initial time of motion, t₁ = 10.0 s

final time of motion, t₂ = 6.0 s

The average velocity is calculated as follows;

[tex]v = \frac{\Delta x}{\Delta t} = \frac{x_1 \ - \ x_2}{t_1 \ - \ t_2}[/tex]

let the Eastward direction be positive

Let the westward direction be negative

[tex]\frac{x_1 \ - \ x_2}{t_1 \ - \ t_2} = \frac{12 \ - \ (-8)}{10 -6}= \frac{20}{4} = 5 \ m/s[/tex]

Therefore, the average velocity of the ball is 5 m/s.

Explanation:

P = IV

V = 240

I = 20

P = ?

P = 240 × 20

P = 4800 watts

Answer:

I think the answer 1

Explanation:

im probably wrong too i dont know

Answer:

P = 5sin(880πt)

Explanation:

We write the pressure in the form P = Asin2πft where A = amplitude of pressure, f = frequency of vibration and t = time.

Now, striking the middle-A tuning fork with a force that produces a maximum pressure of 5 pascals implies A = 5 Pa.

Also, the frequency of vibration is 440 hertz. So, f = 440Hz

Thus, P = Asin2πft

P = 5sin2π(440)t

P = 5sin(880πt)

Answer:

V=IR

25. =0.5 ×RESISTANCE

RESISTANCE=25/0.5

=50 ohms

answer is option B

Answer:

........

Explanation:

Answer:

Electronegativity

Explanation:

Answer:

The property that determines an atom;s ability to attract electrons shared in a chemical bond is electronegativity.

Explanation:

Hope you have a great day :)

Answer:

22

Explanation:

all the resistance numbers added together 2.0+6.0+10.0+4.0

resistance formula : v bettary = v1 + v2 + v3 ....

The capacitance of the capacitor if the dielectric constant of the paper is 3.7 :  18 nF

Given data :

Thickness of aluminium capacitor = 0.022 mm

Number of sheets = 500

Thickness of ream = 5.5 cm = 0.055 m

measurement of sheets = 0.216 m by 0.279 m

dielectric constant ( k ) = 3.7

we will apply the capacitance formula below

C = Kε₀A / d

  = 3.7 * 8.85*10⁻¹² * 0.216 *0.279 / ( 0.055 / 500 )

  = 1.8 * 10⁻⁸F ≈ 18nF

Hence we can conclude that The capacitance of the capacitor if the dielectric constant of the paper is 3.7 :  18 nF

Learn more about Capacitance : https://brainly.com/question/13578522

Answer:

temporary iron r made up of soft iron its " true.."