Marie Curie and her husband Pierre were Henri Becquerel's graduate students when Becquerel
discovered spontaneous radiation. In 1903, the Curies shared the Nobel prize for physics with Becquerel.
Based on The Discovery of Radioactivity, which statement best describes Becquerel's influence on
Marie Curie's work with radioactivity?
O
O
Becquerel proposed the concept of radiation and Marie Curie reproduced his experiments.
Becquerel's work proved that radiation was far too dangerous for anyone to experiment with.
Marie Curie's work with Becquerel made her more curious and prompted her to research and
experiment with radioactivity.
Marie Curie was such a talented scientist that Becquerel's work did not have any influence on her
discoveries.
O

Prejudice is a unjustified and baseless attitude towards an individual only because of his membership of a social group. (Ex. Sara likes Jessica because she is in the art club but she absolutely despises Jonah because he is in the math club). Discrimination refers to unjust or negative treatment of a person or a group from other people because he/she belongs to a particular class, group or category. (Ex. Sara invites Jessica to her party, but not Jonah)

Answer:

prejudice is a negative attitude

discrimination is a negative behavior

Explanation:

got it right on edge

Answer:

4.81%

Explanation:

Experimental error (also known as percent error) is the positive difference between the calculated value and the actual value divided by the actual value.

[tex]\%\ error = \frac{|actual-experimental|}{actual}[/tex]

The actual density of aluminum is 2.70 g/cm³.  So the experimental error is:

%error = |2.70 − 2.83| / 2.70

%errror = 0.13 / 2.70

%error = 0.0481

%error = 4.81%

Answer:

B. 200 kW-hrs

Explanation:

Energy = power × time

E = (280 W) (30 days)

E = (0.280 kW) (720 hrs)

E ≈ 200 kW-hrs

B. 200 kilowatt-hours

A kilowatt hour (kWh) is a measure of how much energy you're using per hour, whilst a kW is a measure of power. kW stands for kilowatt, a universal standard for measuring electricity. So, one kilowatt equals 1,000 watts.

energy (KW h) = (Power (watt) * time (hour)) / 1000

given

Power = 280 watt

Time = 30 days = 30 * 24 = 720 hours

energy = (280 *  720) / 1000 = 201.6 kilowatt-hours ≈ 200 kilowatt-hours

correct answer will be B. 200 kilowatt-hours

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Answer:

why should we do , do by your own , no sense

Explanation:

Answer:

Never Cry Wolf (1983)

Explanation:

1. Describe Tyler's scientific question.

Were the wolves the main killers of the rapidly decreasing of caribou population?

As he studies the population however, he discovers the wolves are not the main predators of the caribou at all, in fact the two species coexist peacefully. The real cause for the caribou population decline is discovered to be over hunting by the Eskimos and local hunters.

2. What was Tyler's hypothesis?

The first hypothesis that he addresses is the information he has received from the authorities and the decrease in population by the Wolves. However, as he approaches his behavior, he discovers that new hypotheses should be considered. This is due to the fact that he notes that the Wolves are not 'aggressive' as the compilations show, but also that they can live with the coribous in a peaceful manner.

This is why it poses three hypotheses:

- The wolves are not as aggressive as they seem, so a description of their lifestyle is necessary

- Wolves require another diet to survive in the winter in the absence of the caribous

- Wolves use a different sleep style from humans, so it is necessary to inquire if it is more effective than that of men.

3. Describe Tyler's experiment.

Lifestyle assimilation experiment

To understand the way of life of the wolves, Tyler tries to imitate him.

When approaching them, he establishes a store and begins his surveillance day and night.

Wolf population experiment

To gather more information about the wolf population and get an idea of the amount of wolves in the area, Mowat and a local Eskimo toured the Canadian Arctic to observe them.

Diet experiment

Upon observing the wolves, he discovered that the diet consisted of mice and not caribou. In order to demonstrate that this diet is possible, he decides to continue the same diet

4. What was the independent variable in Tyler's experiment?

The independent variable is mice, because you need to modify them to understand if they are enough or not for the diet.

5. What were the dependent variable(s)?

The dependent variable is proteins, minerals, carbohydrates and other foods that are part of a diet. In this case, the necessary to survive.

6. Describe the experiment's constants.

The constants are those variables that the researcher does not modify during his experiment. In this case the number of mice you eat per day.

7. What data was collected, recorded and analyzed?

For the particular case of the diet, he discovered that mice are enough to eat a diet. However, he also noted that the 10-minute leisurely sleep of wolves, during the day, is much more relaxing than the continuous 8 hours of sleep.

He also discovered that the population of wolves had decreased considerably.

8. What was Tyler's conclusion?

Indiscriminate hunting by the natives was decreasing the population of animals in the region.

9. How did Tyler publicize his results?

It is understood that the protagonist made a compilation of his results and returned to the 'civilization' shows his data obtained to the government entities for the respective action taking.

10. What could Tyler have done differently to increase the “validity” of the experiment?

The videographic and photographic record would have allowed to obtain many more details to understand the behavior of the animals.

11. Give a name to Tyler's Experiment.

Fun, food, and fear.

Answer:

1) Option b. The acceleration is positive when it is thrown up and negative when it is thrown down.

2) Option d. Both B & C

Explanation:

Question 1)

Acceleration is defined as the rate of change of velocity with respect to time.

[tex]a=\frac{v_{f}-v_{i}}{t}[/tex]

When an object is thrown up, its velocity is maximum at the initial point and decreases as the object moves up. Since, the velocity is decreasing, the acceleration will be negative. This can also be proven from the formula mentioned above. When the object is thrown up, initial velocity(vi) is maximum and the final velocity (v_f) is zero, as the object rests for a very tiny moment at its maximum point. This will give a negative numerator and hence the value of acceleration will be negative.

When an object is thrown down, its velocity is zero at the start of the motion and increases as the object falls down. Since, the velocity is increasing in this case, the acceleration will be positive.

Therefore, Option b, gives the correct answer.

Question 2)

When an object falls freely, it falls under the action of gravity under a constant acceleration known as gravitation acceleration. Gravitational acceleration is represented by g and is equal to 9.8 m/s².

Since, the textbook is falling freely, its acceleration will be constant i.e. equal to gravitational acceleration.

When the object falls down, with every second its velocity increases. The velocity in minimum(zero) at the start and is maximum just before the object hits the ground.

So, when the textbook is dropped, it will fall with constant acceleration and its velocity will be increasing.

Therefore, for this question, Both B and C are correct.

1.

Answer:

d.The acceleration is the same regardless of being thrown up or thrown down.

Explanation:

As we know that when object is in air then net force on object is given as

[tex]F = F_g[/tex]

here we know that

[tex]F_g = mg[/tex]

now we will have

[tex]ma = mg[/tex]

so we can say

[tex]a = g[/tex]

so in any case whenever object is in air its acceleration is vertically downwards and magnitude is equal to "g"

Answer:

Both B & C

Explanation:

As we know that when book is in free fall then due to weight of the book it will experience net downward force.

This force will exert

[tex]F = mg[/tex]

now we know that

[tex]a = g[/tex]

so while in free fall the acceleration due to gravity will remain constant on the book but speed will increase

so we have

b.The velocity increases

c.The acceleration remains constant

d. Both B & C

Answer:

All atoms of an element are identical. The atoms of different elements vary in size and mass. Compounds are produced through different whole-number combinations of atoms. A chemical reaction results in the rearrangement of atoms in the reactant and product compounds.

HOPE THIS HELPED!!!!!!!!!!!!!!!!!!! XDDDDDDDDDDD

John Dalton's atomic theory proposed in 1803 described atoms as indivisible units of matter that combine in fixed ratios, reflecting the laws of definite and multiple proportions, with atoms not subject to creation or destruction. Later advancements revealed atoms are composed of subatomic particles, which possess properties differing from the atoms themselves.

John Dalton added new characteristics to the model of the atom by proposing Dalton's atomic theory in 1803. This theory brought forth the idea that all matter is composed of small, indivisible particles called atoms, which could not be created or destroyed. Dalton's theory was significant as it was based on experimental evidence, which included the laws of chemical combinations and the behavior of gases. However, contrary to Dalton's postulation that atoms are indivisible, we now understand that atoms can be divided into subatomic particles: electrons, protons, and neutrons, each with distinct properties.

Some tenets of Dalton's theory that were groundbreaking at the time include the conceptualization that chemical compounds contain elements in a fixed proportion by mass regardless of the quantity, supporting the law of definite proportions. Moreover, Dalton realized that a single element could combine in different ratios to form multiple compounds, which led to the understanding of the law of multiple proportions.

Answer: No new element forms.

Gamma decay differs from alpha decay and beta decay since there is no new element forms.

Explanation:

Among the three types of radio-active decay namely alpha decay, beta decay and gamma decay , gamma decay is the only one where a change in mass number or atomic number doesn’t occur. In gamma decay electromagnetic radiations are produced and the decaying atom doesn’t undergo changes   in atomic number or mass number. Thus no new elements are formed.

In alpha decay [tex](-2^4)[/tex] He nuclei is produced and the atomic number of decaying atom reduces by 2 and its mass number reduces by 4. In beta decay electrons [tex](-1^0)e[/tex]  or positrons [tex](1^0)e[/tex] are produced and depending on whether the product is electron or positron the atomic number of the atom increases or decreases by 1 respectively.

Answer: No new element forms.

Explanation:

Answer:

32 km east

Explanation:

In order to find the final position of the balloon, we need to calculate its total displacement.

We have:

- Displacement towards west: 18 km

- Displacement towards east: 50 km

The two vectors are on the same line: this means that we can simply add them together (taking into account the proper direction) to obtain the total displacement.

Taking east as positive direction and west as negative direction, we have:

[tex]d = 50 + (-18) = 50 - 18 = 32 km[/tex]

And since it is positive, it means that the final position of the balloon is 32 km east from its initial position.

Final answer:

The hot air balloon is currently 32 kilometers east of its starting point after initially traveling 18 kilometers west and then 50 kilometers east.

Explanation:

The current position of the hot air balloon can be determined by calculating the resultant displacement after it travels 18 kilometers west and then 50 kilometers east. Since these displacements are in opposite directions along a straight line, they can be subtracted to find the net displacement. In this case, starting from a reference point, the balloon moves 18 km west and then 50 km east, resulting in a final displacement of 50 km east - 18 km west = 32 km east. Therefore, the current position of the hot air balloon is 32 kilometers east of its starting point.

Answer:

Change

Explanation:

The law of conservation of momentum states that, for a system of interacting objects that do not experience a net external force, the total momentum of the system is conserved.

This law can be demonstrated using Newton's second law:

[tex]F=ma[/tex]

where

F is the net force acting on the system of objects

m is the total mass of the system

a is the acceleration

Since the net external force is zero,

F = 0

Therefore

[tex]ma=0[/tex]

Acceleration can be rewritten as the derivative of velocity:

[tex]m\frac{dv}{dt}=0[/tex]

And using definition of momentum, p = mv,

[tex]\frac{d}{dt}p = 0[/tex]

Which means that the total momentum does not change.

Answer: False

Explanation:

friction is a resistance that one body experiences as it slides over another. friction rather reduces the motion of two bodies sliding against each other, it doesn't enhance it

Final answer:

True, friction is the force that opposes the sliding motion between two surfaces in contact, and arises from both the roughness of the surfaces and molecular adhesive forces.

Explanation:

The statement that friction between solids is the force that opposes the sliding motion of two surfaces that are in contact is true. When two surfaces interact, the opposition to their relative movement arises from a variety of factors, including the roughness of the surfaces and adhesive forces between the molecules of the materials. These forces ensure that, even if the surfaces appear smooth, there is still resistance to motion. This is exemplified by the fact that rubber-soled shoes tend to have better grip compared to those with leather soles, due to the different materials influencing the frictional force.

Answer:

No.  Buoyant force is equal to the weight of the displaced fluid.

B = mg

If ρ is the density of the fluid and V is the displaced volume:

B = ρVg

For fully submerged objects, where the displaced volume equals the volume of the object, buoyant force will be different in different fluids.

For floating objects, buoyant force equals the weight of the object, so it will be the same for any liquid that the object floats in.

Answer:

It takes the train 7.5 seconds to reach top speed

The train travels 112.5 meters before it reaches its top speed

Explanation:

The Metro Rail makes a stop at NRG Stadium to pick up some Texans

fans after the game

After  all the passengers board, the train accelerates at a rate of 4 m/s²

to a top speed of 30 m/s

We need to find the train takes how many seconds to reach the

top speed

Given is:

→ The train start from rest, then its initial speed u = 0

→ It acceleration a = 4 m/s²

→ Its top speed v = 30 m/s

To find the time we can use this rule;

→ [tex]t=\frac{v-u}{a}[/tex]

→ [tex]t=\frac{30-0}{4}=\frac{30}{4}=7.5[/tex] seconds

It takes the train 7.5 seconds to reach top speed

Now we need to find how far the train travels before reaches top speed

We can use this rule;

→ v² = u² + 2as, where s is the distance

→ v = 30 m/s , u = 0 , a = 4 m/s²

Substitute these values in the rule

→ (30)² = 0 + 2(4) s

→ 900 = 8 s

Divide both sides by 8

→ s = 112.5 m

The train travels 112.5 meters before it reaches its top speed

Answer:

40 mph

Explanation:

Velocity is displacement over time.  Displacement is the straight line distance between the starting point and ending point.

v = x / t

v = 320 mi / 8 hr

v = 40 mph

Answer: Copper (Cu)

Neutrons‎: ‎35  Electrons‎: ‎29

Protons‎: ‎29 Atomic Number‎: ‎29

Explanation:

Answer:

Atomic number of copper is 29. The atomic number of an atom is determined by the number of protons in the nucleus. Therefore, there are 29 protons in an atom of copper. In a neutral atom, there are equal number of protons and electrons. Therefore, there are 29 electrons in a copper atom. Mass number of copper is 64.

Number of protons + Number of neutrons = mass number.

Therefore, number of neutrons = 63 -29 = 35

The only way to remain in orbit indefinitely is to make sure that no part of the orbit passes through any air molecules. There are too many of those in a low earth orbit. So a low earth orbit gradually loses energy when the satellite hits air molecules.

Answer:

6.02 m/s²

Explanation:

Mathematically, Force is described as the product of mass and acceleration

F=mg

where F is force in Newton,N , m is mass in Kilograms and g is acceleration due to gravity.

Given that mass,m=1.29g

Weight=F=7.77 N

g=F/m = 7.77/1.29 =6.02 m/s²

Answer:

Reaching activation energy is necessary because reactants require a minimum amount of energy start breaking a chemical bond.

Explanation:

Activation energy is the minimum amount of energy required by the reactants to initiate a chemical reaction. The unit of activation energy is joule or  kilo joule per mole or kilo calories per mole. Activation energy depends on temperature.

The temperature dependence of activation energy is given  by Arrhenious equation. Activation energy is a threshold value of energy. For any reaction to occur this is the minimum amount of energy required.

The correct statement is a. Reactants require a minimum amount of energy to start to break a chemical bond is reaching activation energy necessary.

Reaching activation energy is necessary because it is the minimum amount of energy that reactant molecules must possess in order to undergo a specific chemical reaction. When reactants collide with each other, they must have enough energy to overcome the energy barrier that holds their chemical bonds together. This energy barrier is known as the activation energy.

Once the reactants have reached this activation energy, they can enter into an unstable transition state, where old chemical bonds are breaking and new ones are forming. This transition state is at a higher energy level than the reactants or the products. After passing through this transition state, the reaction proceeds to form the products, which are typically at a lower energy state than the reactants.

The other options are incorrect because:

- Products do not require a minimum amount of energy to start to break a chemical bond; rather, they are the result of the breaking and forming of chemical bonds during the reaction.

- Reactants do not need to have the maximum amount of energy to start to break a chemical bond; they only need to have at least the activation energy.

- Products do not need to have the maximum amount of energy to start to break a chemical bond; in fact, the formation of products usually releases energy, and they are at a lower energy state than the transition state and often than the reactants.

The complete question is- Why is reaching activation energy necessary?

a. Reactants require a minimum amount of energy to start to break a chemical bond.

b. Products require a minimum amount of energy to start to break a chemical bond.

c. Reactants must have the maximum amount of energy to start to break a chemical bond.

d. Products must have the maximum amount of energy to start to break a chemical bond.

Answer:

Magnitude of boat's acceleration is 1.2 ms⁻²

Explanation:

Given data

Initial velocity = v₁ = 25 m/s

Final velocity = v₂ = 35 m/s

distance = s = 250 m

Acceleration = a = ?

Using 3rd equation of motion

                       2 a s = v₂² - v₁²

          2 × a × (250) = 35² - 25²

                  500 × a = 600

                             a = 600/500

                             a = 1.2 ms⁻²

Thus the acceleration of the boat is 1.2 m/s² until it travel up to 250 m from initial velocity 25m/s to final velocity 35 m/s.

The speedboat's change in velocity is 10 m/s and using the equations of motion, it's found that the time taken for this change is 10 seconds. By substituting these values into the formula for acceleration, the boat's acceleration is found to be 1 m/s² to the west.

To find the magnitude of the boat's acceleration, we first need to calculate the change in velocity, then divide it by the time it took for this change. In this case, the boat's velocity changes from 25 m/s to 35 m/s, therefore, the change in velocity, also known as delta-v, is 35 m/s - 25 m/s, which equals 10 m/s.

According to the equation for acceleration (a = Δv/Δt), where 'a' is the acceleration, 'Δv' is the change in velocity and 'Δt' is the change in time, however, we don't directly have the change in time. To find this, we can use the equation of motion, distance = (initial speed + final speed)/2 * time.

Substitute the initial speed (25 m/s), the final speed (35 m/s) and the distance (250m) into the equation. The time taken comes out to be 10 seconds. Substituting this obtained time and the change in velocity into the acceleration formula, we get acceleration = 10 m/s / 10 s, which equates to 1 m/s². Thus, the boat's acceleration is 1 m/s² to the west.

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Answer:

The chemical reactions involves changes in energy due to the changes in the breaking and building of bonds.

Explanation:

The changes in energy that chemical reactions involves are:

Endothermic: The chemical reactions which absorbs the energy those chemical reactions are called endothermic chemical reactions.

Exothermic: The chemical reactions which releases the energy those chemical reactions are called exothermic chemical reactions.

The similarity in the reactions is both reactions are related to the change in energy. In one reaction the energy is absorbing and in another reaction the energy is releasing.

Answer:

Both reactions release energy.

On Plato!!!

Explanation:

Answer:

the product of 43.43.43.43 is 774

In conclusion, the given numbers expressed in the standard exponential form are 43.43 × 10⁴, 1.001 × 10⁵, and p⁵, reflecting their respective digit factors and exponential factors with precision and clarity.

To write the given numbers in standard exponential form, we express them as a product of a digit factor and an exponential factor. Each number is rounded to four significant figures.

These representations conform to the standard exponential notation, facilitating concise and standardized expression of numerical values, particularly in scientific and mathematical contexts. By adopting this format, numerical data can be presented uniformly, enhancing clarity and facilitating ease of comprehension across various disciplines and applications, from physics and engineering to finance and beyond.

(a) In the absence of gravity, the marbles collide at the x-coordinate corresponding to the initial position of marble 1.

(b) Considering gravity, we calculate the time of flight for marble 2 and then find its horizontal distance traveled to determine the collision point.

To solve this problem, we'll first determine the time it takes for each marble to collide in the absence of gravity, and then we'll consider the effect of gravity to find the collision point with it. We'll use the kinematic equations for projectile motion.

Given:

Marble 1: Horizontal launch with speed v1 = 4.20 m/s and initial height h1 = 0.950 m.

Marble 2: Launched from ground level with speed v2 = 5.94 m/s at an angle.

(a) Collision point without gravity:

Time of flight for marble 1 (t1):

Using the kinematic equation: h = (1/2)gt^2

0.950 = (1/2)(0)t1^2

t1 = 0

Since marble 1 doesn't experience vertical motion, it remains at the initial height h1. Marble 2 will collide with marble 1 when it reaches the x-coordinate corresponding to the initial position of marble 1.

(a) Collision point with gravity:

Time of flight for marble 2 (t2):

Using the kinematic equation: h = v_iy t - (1/2)gt^2

0 = v_iy t2 - (1/2)gt2^2

Solving this quadratic equation for t2.

Horizontal distance traveled by marble 2:

x2 = v_ix t2

Collision point:

The collision point will have coordinates (x2, 0).

Answer:

C. Physics

Explanation:

Both energy and forces are all in the tier of Physics.

Answer:It can slow down, it can speed up and it can change its direction.

Explanation:

Answer: d=vt

Explanation:d= the whole number m divide it by s ( how many seconds there are ). Like (5m/s) (3s) for an example

Answer:

The answer is D you were correct

Answer:

its D

hope this helps

Answer:

The official measurement unit for energy is the Joule (J).

Explanation:

Answer:

C.Static friction

Explanation:

We are given tat a box which is kept on the table.

The box is at rest on the table.

We have to find which force is represented by vector A

We know that

Static friction: it is that force which kept object at rest.It is a type of friction force and  exist  between stationary object and surface on which it is resting.

When some forces acting on the box but the box remain at rest  on the table due to static friction.

The force is represented by vector A is static friction .

Answer:C.Static friction

The representative vector on the object at rest is equal to the static friction of the object.

The given object is at rest because the resultant force on the object is zero.

The representative vector is the resultant of the vectors, this will be resultant of the vertical forces and horizontal forces.

The object will be in equilibrium if the resultant force is zero and the resultant vector will be equal to the static frictional force.

Static frictional force is the force acting on an object that is at rest, this force acts between the object at rest and the resting surface.

Thus, the representative vector on the object at rest is equal to the static friction of the object.  

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Answer:

A.

Explanation:

Answer:

Resultant displacement, R = 38 meters

Explanation:

Distance covered the pirate, d = 37 m (due north)

Distance covered by pirate, d' = 8.5 m (due east)

Let R is the magnitude of his resultant displacement. The displacement of an object is equal to the shortest path covered by it. It can be calculated as :

[tex]R=\sqrt{d^2+d'^2}[/tex]

[tex]R=\sqrt{(37)^2+(8.5)^2}[/tex]

R = 37.96 meters

So

R = 38 meters

So, the magnitude of his resultant displacement is 38 meters. Hence, this is required solution.

Answer:

(a) 200.0628 N   ;   ( b) 4.08Kg

Explanation:

We know,

w = mg        [here w= weight , m= mass , g= gravity]

now,

gravity on earth (g) =9.807 m/s²

mass of the spanner (m)=?

weight of the spanner on earth(w) = 40N

                                              ⇒ w = 40N

                                              ⇒m g =40N

                                              ⇒m = (40/g) Kg

                                              ⇒m= (40/9.807)Kg

                                             ∴m=4.08Kg

∴mass of the spanner on earth = 4.08Kg

We know,

Mass is the amount of matter in an object . So mass will remain same both on earth and jupiter.

So,

(b)The mass of the spanner on jupiter =  4.08Kg

Now,

The mass of the spanner on jupitar (m) =  4.08Kg

Gravity on jupiter (g*) = 5.g              [5 times on earth]

                                   = 5 . (9.807)m/s²

                                   =49.035 m/s²

(a)    

∴weight of the spanner on jupitar(w*) = m g*

                                                            =(4.08 x 49.035) N

                                                            =200.0628 N

one joule is the energy required to push a body with 1 newton force and move it 1 metre distance

Final answer:

One joule is the SI unit of energy, equivalent to the kinetic energy of a 2 kg object moving at 1 m/s. It also represents the work done when a force of one newton is applied over a distance of one meter. The joule is interconnected with other energy units, such as the calorie, with 4.184 J equating to 1 cal.

Explanation:

Definition of One Joule:

The joule (J) is the SI unit of energy and work. By definition, one joule is the kinetic energy of an object with a mass of 2 kilograms moving at a velocity of 1 meter per second. This unit can also be described as the work done when applying a force of one newton through a displacement of one meter, thus 1 J = 1 newton meter (N·m). In terms of everyday examples, 1 J is approximately the amount of energy required to lift a small apple one meter against Earth's gravity. Moreover, in dietary terms, 4.184 joules is equivalent to one calorie, the unit used to express the energy provided by the digestion of foods.

For more extensive quantities of energy, the joule is often scaled using prefixes like kilojoule (kJ), which is equal to 1,000 J, or megajoule (MJ), which stands for 1,000,000 J.