A 615 watt refrigerator runs 24 hours/day. how much energy is used per month (30 days)? express your answer in kwhr.
o a 28.45 kwhr
ob. 442,800 kwhr
oc. 442.8 kwhr
d. 14.76 kwh

Answer:

B

Explanation: a chemical reaction is only the rearrangement of electrons where a nuclear reaction actually changes the elements and thus the nuclei

Answer:

The nuclei of the atoms are changed by the reaction.

Explanation:

Just took the test.

Minimum angle: θ ≈ 23.2 degrees | Rock's speed: v ≈ 2.65 m/s

To determine the minimum angle the string can make with the horizontal, we can analyze the forces acting on the rock when it is whirled in a horizontal circle.

Minimum angle:

The tension in the string provides the centripetal force required to keep the rock moving in a circle. The maximum tension the string can withstand before breaking is given as 150 N. At the minimum angle, the tension in the string will be equal to the breaking strength.

The centripetal force is given by the equation: \(F = m * (v^2 / r),\)where F is the force, m is the mass, v is the velocity, and r is the radius of the circle.

At the minimum angle, the tension (F) in the string is equal to the breaking strength, which is 150 N. The mass (m) of the rock is given as 970 g (0.97 kg), and the radius (r) is 1.8 in (0.04572 m). We can solve for the velocity (v).

\(150 N = 0.97 kg * (v^2 / 0.04572 m)v^2 = (150 N * 0.04572 m) / 0.97 kgv^2 = 7.0456 m^2/s^2v = √(7.0456) m/sv ≈ 2.65 m/s\)

Now, we can use trigonometry to find the minimum angle. The tension (150 N) is the vertical component of the tension force, and the horizontal component can be calculated using the angle θ:

Tension (horizontal component) = Tension (vertical component) / tan(θ)

Tension (horizontal component) = 150 N / tan(θ)

Since the tension in the horizontal direction is equal to the centripetal force, we can substitute the centripetal force equation:

\(m * (v^2 / r) = 150 N / tan(θ)\)

Now we can solve for the minimum angle (θ):

\(tan(θ) = (m * v^2) / (r * 150 N)θ = arctan((m * v^2) / (r * 150 N))\)

Substituting the given values, we can calculate the minimum angle.

Rock's speed at the minimum angle:

At the minimum angle, the rock's speed can be calculated using the previously derived velocity value (v).

The rock's speed at the minimum angle is approximately 2.65 m/s.

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The magnitude of the force F experienced by a charge q that moves in a direction perpendicular to a magnetic field B with a speed v is given by:

Isolate B from the equation:

Replace F=22.394N, q=0.049C and v=272.4m/s to find the strength of the magnetic field:

Therefore, the magnetic field strength is approximately 1.7T.

Answer:

1 Ampere.

Explanation:

From the question given above, the following data were obtained:

Resistor 1 (R₁) = 20 ohm

Resistor (R₂) = 20 ohm

Voltage (V) = 10 V

Current (I) =?

Next, we shall determine the equivalent resistance in the circuit. This can be obtained as follow:

Resistor 1 (R₁) = 20 ohm

Resistor (R₂) = 20 ohm

Equivalent Resistance (R) =?

Since the resistors are in parallel connection, the equivalent resistance can be obtained as follow:

R = (R₁ × R₂) / (R₁ + R₂)

R = (20 × 20) / (20 + 20)

R = 400 / 40

R = 10 ohm

Finally, we shall determine the total current in the circuit. This can be obtained as illustrated below:

Voltage (V) = 10 V

Equivalent Resistance (R) = 10 ohm

Current (I) =?

V = IR

10 = I × 10

Divide both side by 10

I = 10 / 10

I = 1 Ampere

Therefore, the total current in the circuit is 1 Ampere.

Answer:  The magnitude of the ball's momentum change is  

      Δp=m∣ν  

i

​

−ν  

f

​

∣=(0.70kg)∣(5.0m/s)−(−2.0m/s)∣=4.9kg⋅m/s.

Explanation:

The mechanical power expended when transporting the wheelchair is 25 Watts

Power is defined as  the amount of energy transferred or converted per unit time. The unit of power is measured in Watts. The higher units are kilowatts, megawatts etc.

The formula for calculating the power expended is expressed as:

Power = Workdone/Time

Since workdone = force * distance, the formula for power will be:

Power = Force*distance/Time

Given the following parameters

Force = 50N

distance = 0.5m

time = 1 second

Substitute to determine the power

Power = 50*0.5/1

Power = 25/1

Power = 25Watts

Hence the mechanical power expended when transporting the wheelchair is 25 Watts

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Answer:

A line of symmetry is a line that separates a shape into two identical halves.
Rotational symmetry is the same thing except when you rotate the object, it has to have the exact same line of symmetry.

Hope this helps!!!

The correct answer to this question is (C) 3. Seismograph stations are used to detect and record seismic waves generated by an earthquake.

The waves travel through the Earth and are picked up by the seismographs at different times, depending on their distance from the epicenter. By comparing the arrival times of the waves at different stations, seismologists can determine the location of the earthquake's epicenter.

To locate the epicenter of an earthquake, at least three seismograph stations are needed. The reason for this is that the arrival times of the seismic waves at each station can be used to determine the distance from that station to the epicenter. By drawing circles on a map around each station with a radius equal to the distance from the epicenter, the intersection of these circles will give an approximate location for the epicenter. However, with only two circles intersecting, the location of the epicenter is still uncertain, as there are two possible points where the circles could intersect. With three circles, the intersection will only occur at one point, giving a more accurate location for the epicenter.

While more than three seismograph stations can be used to locate the epicenter, the additional data they provide mainly improves the accuracy of the location and is not necessary to determine the general location of the epicenter. Therefore, the correct answer is (C) 3.

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The number of times the drops were repeated and the mass of the balloons may be controlled variables that are kept constant during the experiment to isolate the effect of the height of the window on the time it takes for the balloons to reach the ground.

What is Isolated System?

An isolated system is a concept in thermodynamics and physics that refers to a system that does not exchange energy or matter with its surroundings. It is a closed system with respect to both energy and matter, meaning that no energy or matter is transferred across its boundaries. In an isolated system, the total energy, including both kinetic and potential energy, remains constant over time. This is known as the principle of conservation of energy.

The experiment's variable in this case is the height of the window from which the balloons are dropped. The students are specifically testing the effect of gravity, which is influenced by the height from which an object falls. By varying the height of the window, the students are manipulating the independent variable (height of the window) to observe the effect on the dependent variable (time it takes for the balloons to reach the ground).

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Astronomers believe that mars once had rivers and running water images from orbiting spacecraft reveal ancient channels that resembles drive up river beds on earth.

Astronomers are scientists who study celestial objects and phenomena, such as stars, planets, galaxies, and black holes. They use a variety of tools and techniques to observe and measure these objects, including telescopes, cameras, spectrographs, and computer simulations.

Astronomers seek to understand the fundamental properties and behavior of the universe, such as its origins, evolution, and composition. They also explore the possibility of life beyond our own planet and the potential for space exploration and colonization. To pursue their research, astronomers often collaborate with other scientists in related fields, such as physics, chemistry, and computer science. They also work closely with engineers and technicians to develop and improve the instruments and equipment used in their observations.

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Answer:

Explanation:

a) Using the equation of motion

S = ut + 1/2gt²

S is the distance of fall

g is the acceleration due to gravity

t is the time taken

Given S = 12.0m, g = 9.81m/s^2, un= 0m/s

12 = 0+1/2(9.81)t²

12 = 4.905t²²²

t² = 12/4.905

t² = 2.446

t = √2.446

t = 1.56secs

b) To determine how fast is the frog falling at this point, we need to calculate the speed of the frog. Using the equaton v = u+gt

v = 0+9.81(1.56)

v = 15.34m/s

Hence the frog is falling at the rate of 15.34m/s

Based on the given information, we have an object placed 5.0 cm to the left of a converging lens with a focal length of 20 cm.

In this case, the object is located closer to the lens than its focal point, specifically at a distance less than twice the focal length. As a result, the image formed by the lens will be virtual, upright, and located on the same side of the lens as the object.

Since the object is placed to the left of the lens, the image will also be formed to the left of the lens. The image will be magnified compared to the object since it is formed farther away from the lens than the object's actual size. The exact characteristics of the image, such as its size, position, and magnification, can be determined using the lens formula and magnification equation. Therefore, the resulting image will be virtual, upright, and located to the left of the lens. It will be magnified compared to the object.

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The statement that best explains why the temperatures at the equator are warmer than at the North Pole is "the sun shines most directly on the equator and spreads out over a relatively small area."

This is due to the fact that the Earth is a sphere, and the equator is the part of the surface that is closest to the sun. Therefore, solar radiation from the sun strikes the equator more directly than at the poles, where the sunlight strikes at an angle, and over a larger surface area.

When sunlight hits the Earth's atmosphere, it is absorbed, scattered, and reflected, but the amount of energy reaching the surface of the Earth depends on the angle of incidence. At the equator, the angle of incidence is nearly perpendicular to the surface of the Earth, meaning the sunlight is more concentrated over a smaller area, which results in more heat being absorbed by the Earth's surface, leading to warmer temperatures.

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The average change in momentum for the car during the trip is 8400 kg·m/s.

What is Momentum?

Momentum is a vector quantity, meaning it has both magnitude and direction. The direction of momentum is the same as the direction of velocity, and its magnitude is proportional to both the mass and the velocity of the object.

Then, we calculate the final momentum of the car during the remaining 3 hours:

Final momentum during the remaining 3 hours = mass × final velocity during the remaining 3 hours = m × v2

Now, we can calculate the average change in momentum:

Average change in momentum = Final momentum - Initial momentum

= (Final momentum during the first 2 hours + Final momentum during the remaining 3 hours) - Initial momentum

= [(m × v2) + (m × v2)] - (m × v1)

= 2m × v2 - m × v1

Plugging in the given values:

Mass of the car (m) = 1400 kg

Initial velocity (v1) = 32 m/s

Final velocity during the first 2 hours (v2) = 38 m/s

Average change in momentum = 2m × v2 - m × v1

= 2 × 1400 kg × 38 m/s - 1400 kg × 32 m/s

= 53200 kg·m/s - 44800 kg·m/s

= 8400 kg·m/s

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To ensure a continuous supply of water, a well must be properly constructed and maintained.                                              

This includes ensuring that the well is drilled deep enough to reach a consistent and reliable source of water, as well as ensuring that the well is properly sealed and protected from contamination. Regular maintenance, such as periodic water quality testing and well cleaning, is also important to ensure the well continues to provide safe and reliable water for years to come.
Additionally, proper well management involves maintaining the pump system, implementing water conservation measures, and protecting the recharge area to prevent over-extraction or depletion of the groundwater source. By taking these steps, a well can consistently provide clean and safe water to meet the needs of its users.

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Answer:

2+2 divided by 2 to the power of the 4 = 81

Explanation:

good luck

Given :- A resistor of 150 ohm, hence Resistance (R) = 150 ohm

Potential Difference (v) = 24 V

Current (I) = ?

V = IR

24 = I × 150

I = 24/150

I = 0.16 ampere

hope it helps!

Answer: 4.0 ohm

Explanation:

Answer:

correct statement should be the same speed.

Explanation:

if the car is moving east reads 60 mph and it passes another car with the same speed.

therefore, the magnitudes of their velocities are equal.

and each car's velocity is the negative of the other car vehicle.

so the correct statement should be the same speed.

Answer:

They have different velocities

Explanation:

The cars are passing each other at the same speed, and because velocity is speed with direction they are at different velocities.

Hi there!

We can solve this in two ways, using the Work-Energy theorem or kinematics.

Work-Energy:

We know that:

Ei = Ef, as long as there are no external forces working on the system.

Thus:

Ei = PE = mgh

Ef = KE = 1/2mv²

Therefore:

mgh = 1/2mv²

We can cancel out the mass:

gh = 1/2v²

9.8(10) = 1/2v²

√196 = v = 14 m/s

We can also solve using kinematics, using the equation:

vf² = vi² + 2ad

From rest (vi = 0 m/s) and a = g, so:

vf² = 2gd

vf = √2gh

vf = √(2 × 9.8 × 10) = 14 m/s

Answer:

A trough

Explanation:

A trough is an elongated area of relatively low pressure extending from the center of a region of low pressure.

I HoPe ThIs Helps!!!

Answer:

C

Explanation:

You don't want to buy a 1000 dollar credit card.

The features are useful, like the little sync feature to automatically pay is awesome.

The plan of use for the card is important

the card aesthetic doesn't affect the card in any way, just your personal preference

The relationships between momentum, mass, and velocity is that the product of mass and velocity gives the momentum of that object ( kg.m/s ).

P = mv.

Momentum is simply the product of the mass of an object and its velocity.

Its is expressed as;

P = m × v

Where m is the mass of the object and v is its velocity.

The relationships between momentum, mass, and velocity is that the product of mass and velocity gives the momentum of that object ( kg.m/s ).

P = mv

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Answer:(C)

Explanation:

because is 13 trust me I got it right

Answer:

Absolutely no real-life phenomena/ uses are possible that are related to any branch of physics, except:

1 The device you are reading this answer on. (quantum mechanics, electronics )

2 The air conditioner in your room. ( electromagnetism, electronics )

3 The satellites and space stations in space which will help in the deciphering of the universe will help us look for a suitable planet when we render the earth useless. ( general and special relativity, classical mechanics )

4 Ohh. I forgot, do you wear clothes, well they are made in factories where factories run on the principles of thermodynamics, which is physics.

5 Ever gone somewhere? Well, the transportation uses classical mechanics, thermodynamics, electromagnetism, relativity ( if you know Global Positioning System )

6 GPS itself! It’s used in online maps, navigating, and this sort of stuff. It works on general relativity.

Honestly, this list is endless.

A reference frame is a perspective from which you observe and measure things. Used to define the movement and position of objects. Two people can have different frames of reference for the same situation. In this case, they observe the movement and position of objects differently.

A reference frame is a perspective from which you observe and measure things. Used to define the movement and position of objects.

Two people can have different frames of reference for the same situation. In this case, they observe the movement and position of objects differently.

Units are a way of expressing measurements. It can consistently describe object velocity, mass, position, etc.

Scientists need to communicate their data clearly. They do this by sharing the units and frame of reference they use to measure.

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From the calculation, the gravitational force of attraction is  1.33 * 10^-14 N.

The gravitational force is an attractive force that acts between any two masses.

It is given by;

F = Gm1m2/r^2

F = 6.67 * × 10−11 * 2.5 * 5/(250)^2

F  = 83.4  × 10−11 /62500

F= 1.33 * 10^-14 N

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Answer:

F=ma

5N=0.3a

a=5/0.3=16.66m/s²

PLEASE GIVE BRAINLIEST

Answer:

16.7

Explanation:

acceleration=force/mass