Sally made breakfast for the family on Saturday morning. She put some bread in the toaster. When the bread popped up, Sally grabbed the toast. "Ouch! That's hot!" Sally exclaimed. What was the SOURCE of the heat that made the bread hot?

The correct statement for the possible number of compounds that can be formed is that there are a finite number of possible compounds because the number of elements is limited. Hence, option C is correct.

Any material made up of similar molecules with atoms from two or more distinct chemical elements is referred to as a chemical compound. Atoms from more than 100 distinct chemical elements, both in their pure forms and when mixed to form chemical compounds, make up all objects in the universe.

A sample of a pure element contains only the atoms that are distinctive of the that element, and each element's particles are distinct. For instance, the atoms that make up carbon differ from the ones that make up iron, that differ from those that make up gold. Every element has a distinctive symbol that is made up of one, two, or differentiates between three that either come from the element's present name or from its original (typically Latin) name.

To know more about compounds:

https://brainly.com/question/13516179

#SPJ2

Helium has an atomic mass of 4.00 atomic mass units.

Answer:

Option D. Oxygen

Explanation:

Aristotle believed that there were four elements Earth, water, fire and air with which everything is made up of.

Stars can not be made out of any of the four elements.

Therefore, in the given options Oxygen is the element which is not one of Aristotle's four elements.

Option D. Oxygen is the answer.

The question is about physics and refers to the ideal gas laws. From the data provided, we know that the volume of the bag at the top of the mountain will change due to a decrease in pressure and temperature. By using the ideal gas laws equations, we can find the final volume of the bag.

The question is inquiring about the change in volume for a bag when the pressure and temperature change from the base of the mountain to the top. Here, we will use the ideal gas laws which state that volume is directly proportional to temperature and inversely proportional to pressure. Given that the initial pressure is 760mmHg and the final pressure is 453mmHg and that the temperature fell from an average room temperature of 25°C (or 298.15 K) to 8°C (or 281.15 K), we can use these principle to solve the question. Note that pressure is given in mmHg and needs to be converted to the same unit.

You can calculate the change in the bag's volume using the relationship between the initial and final state: V1/T1 = V2/T2 where V1 is the initial volume and V2 is the final volume. Considering the pressure changes, you could use another ideal gas law equation that defines the relationship between pressure and volume: P1V1=P2V2, where P1 and P2 are the initial and final pressures respectively.

By applying these formulas, you can calculate the change in volume of the bag. Have in mind that this is an approximation since real gases don't always behave as ideal gases, especially under extreme conditions.

https://brainly.com/question/30458409

#SPJ12

Final answer:

Newton's third law dictates that as Lucy pushes a box forward, the box pushes back with an equal and opposite force.

Explanation:

According to Newton's third law, whenever Lucy pushes the box across the floor exerting a force on it, the box exerts an equal and opposite force back onto Lucy. This law states that forces occur in equal but-opposite-to pairs -- meaning, if object A exerts a force on object B, object B exerts a force of equal magnitude but in the opposite direction on object A. In Lucy's case, as she pushes the box forward, the box pushes back on her with the same amount of force.

Diamond Abrasive and Mineral Polisher are the most useful as grains on sandpaper.

Sandpaper is also known as glasspaper. It is used for a type of coated abrasive consisting of sheets of paper or cloth with abrasive material glued to one face.

Sandpaper is produced in a variety of grit sizes which are used

1. Remove material from surfaces to make them smooth or to remove a layer of material

2. Surface roughening

Diamond abrasives and mineral polishers are some examples of sandpapers used as a grain. Diamond abrasive powder or crushed diamond used as an abrasive is also known as diamond powder. A mineral polisher is a mineral that forms or finishes a workpiece by rubbing it.

Thus, Diamond Abrasive and Mineral Polisher are the most useful as grains on sandpaper.

Learn more about Sandpapers, here:

https://brainly.com/question/15631000

#SPJ5

Answer:

Explanation:

Encyclopedias are written by an academic source, which transform them in a reliable scholarly source.

On the other hand, a magazina article is written and corrected by an editorial which is not academic in most of the cases. Similarly, a newspaper is based in editors about different topic outside the academica environment.

Finally, a TV show is the least trustworthy of the choices, because must of the time, TV shows are made to just entertain to increase their raitings.

Therefore, the right answer is an encyclopedia.

On a typical seismogram, surface wave will show the highest amplitudes. The correct option is b.

A seismograph produces a graph known as a seismogram. It is a log of the ground motion over time at a measurement station.

Seismograms typically capture motions along three cartesian axes, with the x and y axes parallel to the surface of the Earth and the z axis perpendicular to it.

Earthquake location and magnitude are found via seismograms. It is possible to think of an earthquake's magnitude as changing depending on how much energy is released at the rupture point.

Geologists utilize a seismometer, sometimes known as a seismograph, to measure and capture seismic waves. Surface waves often have the highest amplitudes on a seismogram.

Thus, the correct option is b.

For more details regarding seismogram, visit:

https://brainly.com/question/4363313

#SPJ5

Christopher will not make any progress upstream. From the point of view of his friends standing on the riverbank, he'll remain at one point, motionless except for his furious paddling motions.

Given data:

The speed of Christopher in still water is, v = 8 km/h.

The speed of river is, u = 8 km/h.

The upstream is the motion of any object (say boat) in a river, which is in the direction opposite to the direction of flow of stream or river. And the expression for the upstream as per the given problem is,

upstream = v - u

So, on substituting the values we get,

upstream = 8 - 8

upstream = 0 km /h.

Thus, we can conclude that Christopher will not make any progress upstream. From the point of view of his friends standing on the riverbank, he'll remain at one point, motionless except for his furious paddling motions.

Learn more about the upstream here:

https://brainly.com/question/2948611

If one of the four engines suddenly fail, so this means that we only get 3 / 4 of the original force. Since force is the product of mass and acceleration and mass is constant, therefore we get 3 / 4 of the original acceleration.

So the remaining acceleration is:

a = (2.0 m/s^2) * (3 / 4)

a = 1.5 m/s^2

Final speeds of both baseballs will be the same when they hit the ground, calculated by the kinematic formula, and the difference in time of flight is twice the time it takes for the upward-thrown ball to reach its highest point and start falling.

When a player throws one baseball vertically upward at speed (vo) and another vertically downward at the same speed, the formula to calculate the final velocity (v) at the point of impact, ignoring air resistance, is given by v = √(v₀^2 + 2gh), where g is the acceleration due to gravity (9.81 m/s²) and h is the height from which the balls were thrown.

The ball thrown downwards will have an initial speed of v₀ downwards; therefore its final speed will be v = v₀ + √(2gh).

The ball thrown upwards will reach a velocity of zero before changing direction and falling back down, thus its final speed will converge on the same value as a ball thrown downwards (ignoring air resistance and the initial upward speed).

The difference in time of flight is due to the time it takes for the upward thrown ball to stop and start falling, which is t = v₀/g.

So, the upward thrown ball will take an additional 2t (up and down) time to hit the ground compared to the downward thrown ball.

Utilizing the kinematic equations for projectile motion can aid in solving for these values.

The shortening velocity is the rate at which a muscle shortens during a contraction. The force of a muscle contraction decreases with speed.

The pace at which a muscle shortens while contracting to lift a load is referred to as the shortening velocity. Only with a light load may the shortening velocity be increased to its maximum. The shortening velocity is at its maximum when the load is light.

When lifting a heavy object, the muscle moves more slowly as it slows down as it lifts the object. Muscles must exert additional internal effort to distort their tissue and, in particular, to overcome the inertia brought on by their internal mass in order to do outward work. The contribution of a muscle's internal bulk to its mechanical output has, however, hardly ever been researched.

To know more about shortening velocity :

https://brainly.com/question/28244416

#SPJ5

If you are standing on the floor, motionless, the forces that act on you are:

.The force of gravity acts downward

.The force the floor exerts upward.

What is  force of gravity?

The force of gravity is a force that pulls a body towards the centre of the earth or any other physical body with mass.

Gravity determines how fast objects move towards each other. The average gravitational pull of the Earth is 9.8 meters per second squared (m/s²).

What is the force the floor exerts?

It is the normal reaction in the upward direction.i.e the normal force. The force the floor exerts in repulsion as a result of the weight of the individual standing on it.

Note that, these two forces are of equal magnitude and in opposite directions, so they balance each other. Hence, the person standing is at equilibrium.

Learn more about force on

https://brainly.com/question/29323668

#SPJ1

Final answer:

When standing still, you experience the force of gravity pulling you down and the normal force from the floor pushing you up. These forces are equal and opposite, creating a static equilibrium situation, as described by Newton's third law.

Explanation:

When you stand still on the floor, two primary forces act on you: the force of gravity, which pulls you downward, and the normal force exerted by the floor, which pushes you upward. These two forces are indeed equal and opposite when you are motionless, according to Newton's third law of motion. Specifically, this law states that for every action there is an equal and opposite reaction. Therefore, the floor exerts an upward normal force on your feet that is equal in magnitude but opposite in direction to the force of gravity acting downward on you. This situation is an example of static equilibrium, where all the forces on an object cancel each other out, resulting in no net force and no acceleration.

The normal force is a reactive force; it responds to the compression caused by your weight and the gravity force. As long as you remain standing still, with no other external forces acting on you, these forces will remain in balance, keeping you stationary on the floor.

Answer: B.

15.6 newtons

Explanation: edmentum

Final answer:

In deep space, d) a spacecraft given a quick push will keep moving indefinitely until an equal and opposite force stops it, in accordance with Newton's First Law of Motion. This is due to the lack of air resistance and minimal gravitational pull in deep space.

Explanation:

If a spacecraft that seems to be motionless in deep space is given some type of quick push, the correct answer is D: the spacecraft will move and will not stop until it is stopped by an equal and opposite force. This outcome is dictated by Newton's First Law of Motion, often referred to as the law of inertia. According to this law, in the absence of an external force, an object at rest remains at rest, and an object in motion continues in motion with the same speed and in the same direction. Space, particularly deep space, has neither air to cause resistance nor sufficient gravitational pull from nearby masses to significantly alter the craft's course, assuming it's far enough from any massive body.

For example, spacecraft in interplanetary space operate for the most part without continuous thrust. They rely on brief engine fires to make adjustments to their trajectory or speed and then continue on their course due to the lack of resistance. Similarly, an asteroid travelling through space distant from gravitational forces will not slow down unless acted upon by another force.

The angular diameter can be calculated by using the formula,

Angular diameter = 57.3 x physical diameter / distance.

The physical diameter of the sun = 1.4 x 10^6 km.

The minimum distance of Mars from Sun = 205 x 10^6 km

The minimum angular diameter of the Sun as seen from Mars is:

Angular diameter = 57.3 x physical diameter / distance = 57.3 x (1.4 x 10^6 km / 205 x 10^6 km) = 0.39 degrees.

The maximum distance of Mars from Sun = 249 x 10^6 km.

The maximum angular diameter of Sun as seen from Mars is,

Angular diameter = 57.3 x physical diameter / distance = 57.3 x (1.4 x 10^6 km / 249 x 10^6 km) = 0.32 degrees

To calculate the minimum and maximum angular diameters of the Sun as seen from Mars, use the small-angle formula using the angular diameter of the Sun and the distances to Mars and Earth.

To calculate the minimum and maximum angular diameters of the Sun as seen from Mars, we need to use the small-angle formula. The angular diameter of the Sun is about 0.5°. Mars has an average distance of 227 million kilometers from the Sun, and Earth is about 1 AU from the Sun. Using the small-angle formula, we can relate the angular diameter, the linear diameter, and the distance:

linear diameter = distance x angular diameter

For the minimum angular diameter, we use the distance from Mars to the Sun:

minimum angular diameter = 227 million km x 0.5° / 1 AU

For the maximum angular diameter, we use the distance from Earth to the Sun:

maximum angular diameter = 1 AU x 0.5° / 1 AU

By performing the calculations, the minimum angular diameter of the Sun as seen from Mars is approximately 0.96° and the maximum angular diameter is also approximately 0.5°.

https://brainly.com/question/6443669

#SPJ11

Uniform circular motion refers to the motion of an object moving in a circular path at a constant speed. Despite the constant speed, the object actually experiences constant acceleration due to its constant change in direction, which is coined as Centripetal Acceleration.

Uniform circular motion is a principle in physics that describes the motion of an object traveling in a circular path at a constant speed. Although the speed is steady, the acceleration is not zero. This is because acceleration is not just the rate of change in speed, but also encompasses change in direction. Despite the constant speed in uniform circular motion, the direction of the object is always changing, hence creating acceleration.

Centripetally, the acceleration is directed towards the center of the circle along which the object is moving. The continuous change in direction results in a constant acceleration. This force that keeps the object moving along the circular path is known as the Centripetal Force. Therefore, even with constant speed, the continuous change in direction in a circular path results in constant acceleration, known as the Centripetal Acceleration.

As a concrete example, think about when you're driving and take a turn at a constant speed. You can feel yourself being pulled to the side, an effect of the centripetal acceleration.

https://brainly.com/question/29345640

#SPJ12

Rutherford's model revolutionized atomic theory by proposing a nucleated structure. Our current understanding, based on quantum mechanics, offers a more accurate and probabilistic description of the atom's internal structure.

Rutherford's model, proposed in 1911, was a significant departure from the earlier plum pudding model. It postulated a positively charged nucleus at the center of the atom, with negatively charged electrons orbiting around it in a manner similar to planets orbiting the sun.

However, our current understanding of the atom, based on quantum mechanics, is much more complex:

1. Electron Orbitals: Instead of well-defined orbits, electrons are found within orbitals, which are regions of space around the nucleus where the probability of finding an electron is high. These orbitals are defined by quantum numbers and have various shapes (s, p, d, f, etc.).

2. Quantization: Electrons can only occupy certain energy levels, and the energy of an electron in an atom is quantized. This is in contrast to the planetary model, where electrons could theoretically occupy any orbit at any distance from the nucleus.

3. Nuclear Structure: The nucleus itself is composed of protons and neutrons, which are further made up of quarks. Rutherford's model did not delve into the substructure of the nucleus.

4. Electron Spin and the Pauli Exclusion Principle: Electrons have an intrinsic property called spin, and the Pauli Exclusion Principle states that no two electrons in an atom can have the same set of quantum numbers.

The work done on the object during this motion is 765 J.

The given parameters;

The work done on the object is determined by applying work-energy theorem.

W = ΔK.E

W = ΔK.E = ¹/₂m(v² - u²)

W = ¹/₂ x 30(10² - 7²)

W = 765 J

Thus, the work done on the object during this motion is 765 J.

Learn more here:https://brainly.com/question/10063455