Calculate the density of ammonia gas from the information that 8.9 l of the gas has a mass of 6.8 g.

Answer:

16.67 s

Explanation:

Given that the

Grant sprints 50m to the right with an average velocity of 3 m/s.

According to definition of speed,

Speed = distance/time

Substitute speed and distance into the formula.

3 = 50 / t

Make time t the subject of formula

t = 50 / 3

t = 16.667 seconds

Therefore, the number of seconds the Grant sprint is 16.7 s approximately.

The force exerted by the more massive car can be calculated using Newton's second law. The force exerted by the car is equal to its mass multiplied by its acceleration. In this case, the force exerted by the more massive car is 875,000 Newtons.


Given that two cars are accelerating toward each other at 25m/s². One car has a mass of 25000 kg, and the other has a mass of 35000 kg. We need to calculate how much force the more massive one will exert.

By Newton's second law, the force exerted by a body is proportional to its mass and acceleration, expressed mathematically as follows:F = ma,where F is the force, m is the mass, and a is the acceleration.

We know that the acceleration is 25 m/s², and the mass of the more massive car is 35000 kg. So we can calculate the force exerted by that car as follows: F = ma = 35000 x 25 = 875000 N. Therefore, the more massive car will exert a force of 875,000 Newtons.

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The magnitude of Margaret's total displacement is approximately 0.5828 miles.

Since Margaret walked 0.370 miles towards the north direction, the y-component of her displacement is 0.370 miles.

Thus:

y-component = 0.370 miles

We can now find the magnitude of the displacement using the Pythagorean theorem.

The magnitude of displacement is given by:d = √(x² + y²)

Where,x is the x-component of the displacement, and y is the y-component of the displacement.

Substituting the values:

x = -0.450 m and y = 0.370 m

d = √((-0.450)²+ (0.370)²)

d = √(0.2025 + 0.1369)

d = √(0.3394)

d = 0.5828

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First half:

50 km at 50 km/hr ... 1 hour

Second half:

50 km at 100 km/hr ... 1/2 hour

Total distance = 100 km

Total time = 1.5 hours

Average speed = (100 km) / (1.5 hrs)

Average speed = 66 and 2/3 km/hr

Average velocity = 66 and 2/3 km/hr East

The average velocity of the car would be 66.67 Kilometers / hours.

The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.

As given in the problem a car travels 100 km to the east. If the first half of the distance is driven at 50 km/h and the second half at 100 km/h,

The average velocity of the car = Total displacement / total time

                                                     =100 / 1.5

                                                     =66.67 Kilometers / hours

Thus, the average velocity of the car would be 66.67 Kilometers / hours.

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Answer:

A reason why voltmeter is always connected in parallel not in series ​is:

A Voltmeter has very high resistance to ensure that it's connection do not alter flow of current in the circuit. Now if it is connected in series then no current will be there in the circuit due to it's high resistance. Hence it is connected in parallel to the load across which potential difference is to be measured.

The Barbie would be moving with speed 27.69 ft/s at the bottom of the path.

Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.

Mass of the Barbie = 0.23 kg.

Initial height of the Barbie: h= 11 ft 11 inches = ( 11 + 11/12) feet = 11.92 feet.

Acceleration due to gravity: g = 32.17 ft/s²

Hence, the speed of the Barbie at the bottom of the path = √(2gh)

= √( 2 × 32.17 ×11.92) ft/s

= 27.69 ft/s.

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Answer:

Forty-eight million eight hundred thousand

Explanation:

You divide 585.6/12. I really hope this helps!!

Note that the magnitude of the magnetic dipole moment of the bar magnet assuming the bar is suitably far from the compass to permit the approximation is the extent of how powerful a bar magnet is.

A magnetic dipole is the boundary of either a closed loop of electric current or a pair of poles as the size of the source is decreased to zero while the magnetic moment remains constant in electromagnetism. It is a magnetic equivalent of the electric dipole, however, it is not a perfect comparison.

Magnets are all dipoles, which means they have a north pole and a south pole. When a dipole is sliced in half, it creates two new dipoles. A monopole is an object that has only one charge, such as an electron.

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Answer:

750 w : time = 1hour

Explanation:

750x1hour

=750 watt-hours

As soon as the switch is closed, what is the voltage across the capacitor. The voltage across the capacitor is initially zero as soon as the switch is closed.

A capacitor is a device that is used to store electric charge. It consists of two metal plates separated by a dielectric (insulating material). There are no electrical connections between the plates. A capacitor is charged by applying a potential difference (voltage) across the two plates, which causes one plate to accumulate positive charge and the other to accumulate negative charge.

The energy stored in a capacitor is given by the formula: E = 1/2CV², where C is the capacitance and V is the voltage across the capacitor.

The capacitance of a capacitor is determined by its physical characteristics, such as the area of the plates, the distance between them, and the type of dielectric material used.

Immediately after the switch is closed, the voltage across the capacitor is zero since it hasn't had time to charge up yet.

The voltage across the capacitor will increase over time as it charges up until it reaches the voltage of the battery.

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Answer:

PICK ONE

Explanation:

Radio waves and microwaves have in common is c. Both are at the side of the spectrum that has the lowest frequency.

This means that they have longer wavelengths compared to other types of electromagnetic radiation, such as visible light, ultraviolet light, or gamma rays. Due to their lower frequencies, radio waves and microwaves typically have less energy than other forms of radiation on the electromagnetic spectrum.

Despite their differences in frequency and wavelength, both radio waves and microwaves play important roles in modern technology, as they are utilized for communication, navigation, and even cooking in the case of microwaves. In summary, radio waves and microwaves share a key feature: they are both situated at the side of the electromagnetic spectrum that has the lowest frequency, which in turn results in longer wavelengths and lower energy levels. So the correct answer is C. Both are at the side of the spectrum that has the lowest frequency.

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The correct answer is (d) millibars. The basic unit of pressure mapped on weather maps is millibars. In the field of science, pressure is defined as the amount of force acting on a particular surface area.

It is an expression of the force per unit area of surface perpendicular to the force. It is quantified as force per unit area. The unit of pressure is the pascal (Pa), which is equivalent to one newton per square meter.The basic unit of pressure mapped on weather maps is millibars. This unit of pressure is frequently used in meteorology and climatology. The millibar is a measurement of atmospheric pressure that corresponds to one-thousandth of a bar (one bar = 1000 millibars).

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The surface conditions on Venus are more extreme than on Earth, with temperatures ranging from 453 to 473 °C and pressures of 95 bar.

Venus's surface is more hostile than Earth's, with temperatures between 453 and 473 °C and pressures of 95 bar. Venus is devoid of water, which strengthens the crustal rock and preserves surface characteristics. The observed characteristics demonstrate the geological processes at play.

Venus lacks surface water and has a poisonous, thick atmosphere that is nearly completely formed of carbon dioxide and sulphuric acid clouds. The atmospheric pressure at the surface of Venus is almost 90 times greater than that of the Earth at sea level. At a scorching 750 K (477 °C), Venus' surface is the solar system's warmest.

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AnswerAnswerAnswerAnswerAnswer:0.3571m

Explanation:

Given:

The current density is,

a is a constant, and the radius of the wire is R.

To find:

The current in the wire

Explanation:

The current in the wire is,

We know,

So,

Hence, the required current is,

Answer:

The charge of a neutron is 0  

The charge of an electron is -1

Explanation:

Answer:

The charge of Neutrons is: 0

The charge of Electrons is: -1

Explanation:

Neutrons are uncharged and Electrons are negatively charged. The negative charge of one electron balances the positive charge of one proton. Both protons and neutrons have a mass of 1, while electrons have almost no mass.

The bullet takes 0.0025 seconds to pass through the wooden plank of 5 cm thickness when it is traveling horizontally with an initial speed of 30 m/s and a final speed of 10 m/s.

The time taken by the bullet to pass through the wooden plank can be determined using the equation of motion for constant acceleration.

Given:
Initial speed (u) = 30 m/s

Final speed (v) = 10 m/s

Distance (s) = 5 cm = 0.05 m

To find the time taken (t), we need to calculate the acceleration (a) first. We can use the equation:

v² = u² + 2as

Rearranging the equation, we have:

a = (v² - u²) / (2s)

Substituting the given values:

a = (10² - 30²) / (2 * 0.05)

Simplifying the expression:

a = (-800) / (0.1)

a = -8000 m/s²

The negative sign indicates that the acceleration is in the opposite direction of the initial velocity.

Next, we can use the equation of motion:

v = u + at

Substituting the values:

10 = 30 + (-8000) * t

Simplifying the equation:

-8000t = -20

Dividing by -8000:

t = 20 / 8000
t = 0.0025 s

Therefore, the time taken by the bullet to pass through the wooden plank of 5 cm thickness is 0.0025 seconds.


To find the time taken by the bullet to pass through the wooden plank, we need to calculate the acceleration first using the equation of motion.

By rearranging the equation and substituting the given values, we can find the acceleration.

Then, using the equation of motion again, we can solve for time.

The negative sign in the acceleration indicates that it is in the opposite direction of the initial velocity.

The resulting time is 0.0025 seconds.

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The value of the original resistance r is 8.4 Ω.

To solve this problem, we can use Ohm's Law and the formula for calculating total resistance in a series circuit.

First, we know that the current in the original circuit with just one resistance r is 4.0 A. Using Ohm's Law (I = V/R), we can calculate the voltage in the circuit as V = IR = 4.0 A * r.

When the additional resistance of 2.1 Ω is inserted in series with r, the total resistance of the circuit becomes R_total = r + 2.1 Ω. The current in the circuit drops to 3.2 A, so using Ohm's Law again, we can calculate the new voltage as V = IR_total = 3.2 A * (r + 2.1 Ω).

Since the voltage in the circuit remains constant, we can set the two expressions for V equal to each other and solve for r:

4.0 A * r = 3.2 A * (r + 2.1 Ω)

4.0 A * r = 3.2 A * r + 6.72 V

0.8 A * r = 6.72 V

r = 8.4 Ω

Therefore, the value of the original resistance r is 8.4 Ω.

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The force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface.

Answer:

Gravity is the force that keeps everything on the ground instead of it floaating around!

Explanation:

Without gravity, you would be floating round in your house dodging floating objects.

Hope this brings you down to earth!

Have an amazing day!

PLEASE RATE AND MARK BRAINLIEST!! :)

The relative velocity is obtained as 5.3 m/s from the calculation as shown below.

We know that motion refers to the change in the position of an object with time. Give that we know that motion is relative and the position of the two objects that are in motion must always be taken into consideration. In this case, we have the situation in which Timmy and his friends are moving backwards and the runway is moving forward thus they are actually moving in opposite directions as seen.

Let us note that velocity is a vector quantity hence we have to assign the forward direction as positive and the backwards direction as negative. Thus we can then take the relative motion between Timmy and his friend and the walk way can be obtained quite conveniently by the use of;

6.9 m/s - 1.6 m/s  = 5.3 m/s

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Answer:

Explanation:

electron attraction between electron and nucleus = centripetal force of the orbiting electron

In fact, Bohr model depicts the atom as a nucleus surrounded by electrons in circular orbit around it, similar to the planets around the Sun. The centripetal force that keeps the electrons in circular motion around the nucles is provided by the electrostatic force between the electrons and the nucleus.

Answer:

Fg = G M m / R^2    the gravitational force (M  proton, m electron)

Fe = K e^2 / R^2   the electrical force where K = 9 *10E9 and e = charge

Fe / Fg = K e^2 / (G M m)

Fe / Fg = 9 * 10E9 * (1.6 * 10E-19)^2 / (6.67 * 10E-11 * 1.67 * 10E-27 * 9.11 * 10E-31

9 * 1.6^2 / (6.67 * 1.67 * 9.11) * 10^-29 / 10^-69

= 2.27 * 10E39  for the ratio of the two forces

Faraday's law relates the change in magnetic flux density per second to an electromotive force. To test this law, one would require the following apparatus: a coil of wire, a power supply, a magnet, and a voltmeter.

Here's how to test Faraday's law:Firstly, a coil of wire is connected to a voltmeter. The magnet should be moved towards the coil, perpendicular to the coil's plane, so that the magnetic field passing through the coil is changing in strength and direction as the magnet approaches.

Secondly, when the magnet is moved towards the coil, the changing magnetic field will produce an electromotive force (EMF) that is proportional to the rate of change of magnetic flux density. As a result, the voltmeter will show a voltage that changes with time. Finally, by changing the rate at which the magnet approaches the coil, one can vary the rate of change of magnetic flux density, and thus the magnitude of the EMF. It can be concluded that the voltage produced is proportional to the rate of change of magnetic flux density, as described by Faraday's law.
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An example of applying new energy in order to decrease entropy can be seen in a refrigerator.

Here correct answer is A.

A refrigerator operates by removing heat from its interior, which requires energy input. The removal of heat from the interior of the refrigerator leads to a decrease in entropy, as the molecules inside the refrigerator become more ordered and structured.

The compressor in a refrigerator provides the energy necessary to pump refrigerant through the system, which in turn removes heat from the interior of the refrigerator. This is an example of how the input of energy can lead to a decrease in entropy, in this case, by reversing the natural flow of heat from a colder object to a warmer object. In contrast, a light bulb, a heater, and a fan all increase entropy by adding energy to a system, increasing the disorder of the system.

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The difference between longitudinal and transverse waves is with respect to their mediums.

Transverse waves and longitudinal waves are two different forms of waves that differ in the direction that the medium is moving. When the medium's vibration is parallel to the wave direction, a transverse wave is produced. At a right angle to the wave's direction of travel, amplitude is recorded. When the medium being employed vibrates parallel to direction of wave, longitudinal waves are produced.

Amplitude is measured at a zero-degree angle to the wave's travel direction. Transverse waves include crests and troughs, whereas longitudinal waves have compressions and rarefactions. While longitudinal waves can move through fluids like liquids and gases, transverse waves need a relatively rigid medium to do so.

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Answer:

The suction pressure decreases and the superheat increases when the liquid line is restricted and the supply of refrigerant to the metering device is reduced.

Explanation:

1. The five components of refrigeration are:

       The compressor limits the vapor released by the refrigerant. This            

       causes a rise in pressure (in refrigerant), which then pushes the  

       vapor into the coils on the outside of the refrigerator.

2. Now when the cooler air meets the warm gas present in the coils, it

   gets converted into liquid form.

3. Thus, when the liquid form is at high pressure, the refrigerant then  

   cools down as it flows through the coils placed in the fridge ( in both

   freezing and normal sections).

4. The refrigerant also absorbs the warm air present in the fridge, which  

   causes it to evaporate and flow back through the compressor and the

   cycle repeats in the same form.

Thus, when the liquid line is restricted and the supply of refrigerant to the metering device is reduced it causes a decrease in suction pressure and an increase in superheat.

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a blue snake is an example of physical change

Given the resistance of the copper wire, length of the wire, and area of cross-section, we can calculate the resistivity of copper by the following formula.ρ = RA/L, .

Where: R is the resistance of the copper wireA is the area of cross-section of the copper wireL is the length of the copper wireSubstituting the given values, we haveρ = (2×10-2 ohms)(1.7×10-6 m2)/(2 m)ρ = 1.7×10-8 ohm-m.

Therefore, the resistivity of copper is 1.7×10-8 ohm-m. Given the resistance of the copper wire, length of the wire, and area of cross-section, we can calculate the resistivity of copper by the following formula.ρ = RA/L, .Where: R is the resistance of the copper wireA is the area of cross section of the copper wireL is the length of the copper wire .

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Almost all of the kinetic energy of the incident electrons is converted to-d. a bremsstrahlung photon.

When incident electrons interact with matter, such as a target material, almost all of their kinetic energy is converted into a bremsstrahlung photon. Bremsstrahlung, which means "braking radiation" in German, is produced when electrons are deflected or decelerated by the electric field of atomic nuclei in the target material. The abrupt change in direction or speed of the electrons leads to the emission of photons, which can have a wide range of energies. These bremsstrahlung photons can span a broad spectrum, including X-rays, and carry away the kinetic energy of the incident electrons. The conversion of kinetic energy into bremsstrahlung photons is a fundamental process in X-ray production and is utilized in various applications, such as X-ray imaging and radiation therapy.

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