1) What would the average acceleration be for a car at a stoplight that speeds up to 20 m/s in 10 seconds (in m/s^2)

2) Imagine that a car traveling at 100 m/s must slam on the brakes to avoid hitting a raccoon. If it takes 4 seconds for the car to slow down to a stop, what is its acceleration (in m/s^2)

Microwaves in an oven heat food by causing water molecules to align and transfer energy to the thermal motion of the water.

Microwaves in an oven are produced electronically by accelerating electrons. The oscillating electric field of the microwaves inside the oven exerts a torque on water molecules in food, causing them to heat up. The water molecules have a dipole moment, which means they have separated centers of equal and opposite charges. The microwaves cause the water molecules to align in one direction and then in the other, transferring energy to the thermal motion of the water and heating the food.

The law of conservation of energy states that the total energy in a system remains constant. Energy can be transferred from one system to another or change form, but the total amount of energy remains the same.

The law of conservation of energy states that the total energy in a system remains constant. Energy can be transferred from one system to another or change form, but the total amount of energy remains the same. For example, when a ball is raised to a certain height, it gains potential energy. As the ball falls, the potential energy is converted to kinetic energy. The sum of the potential and kinetic energy remains constant throughout the process.

Answer:

Neither energy nor matter

Explanation:

A system is defined as the part of the universe. In thermodynamics, systems are of three types i.e.

1. Open System : In an open system, both energy and matter can freely exchange with surrounding. For example- boiling water in an open pan transfers both energy and matter.

2. Closed system : In a closed system, only energy is exchanged with the surrounding. For example- boiling water with a lid on the pan exchanges only energy with the surrounding.

3. Isolated system : In an isolated system, neither energy nor matter exchanges with the surrounding. For example : a thermos flask does not exchange energy and matter with the surrounding.

Hence, the correct option is (a) " neither energy nor matter ".

Answer:

The correct answers are A and B. Diamond and salt are pure substances.

Explanation:

A pure substance is one whose composition does not vary, even if the physical conditions in which it is found change. For example, water has a formula that is H2O and is always the same, which indicates that it is made up of molecules in which there are 2 hydrogen atoms and 1 oxygen atom. If I changed that formula, it would be another different substance.

A pure substance cannot be broken down into other simpler substances using physical methods.

A pure substance has its own or defined characteristic properties.

Answer:  

The angle of shear can be defined as the angle of the deformation that occurs on the sides when the object is exerted upon by shearing stress or deformation force.

The angle  of twist can be defined as the angle through which the rotating machine element rotates or twists with respect to its free end. The angle of twist exists because of the torque.

v₀ = initial velocity of the mass = 0 m/s                (since the mass falls from rest)

a = acceleration = acceleration due to gravity = 9.8 m/s²

d = vertical distance traveled = 12 m

v = final velocity of the mass

Using the kinematics equation

v² = v₀² + 2 a d

v² = 0² + 2 (9.8) (12)

v² = 235.2

v = √235.2

v = 15 m/s

hence the speed of mass comes out to be

b) 15 m/s

false lies forgive me Based on the periodic table entry for silicon, the atomic mass of silicon is 28.08.

28.08

Answer: A) chemical - gas produced

Explanation: Physical change is a process in which there is no change in chemical composition of the substance.

Chemical change is a process in which there is a change in chemical composition of the substance.

Chemical process is accompanied by following changes

1. Change in color

2. Absorption or release of energy

3. Production of gas

4. Formation of precipitates.

Thus a chemical reaction is happening on mixing baking soda [tex](NaHCO_3)[/tex] and vinegar [tex](CH_3COOH)[/tex], there is production of [tex]CO_2[/tex] which expanded the balloon.

[tex]NaHCO_3+CH_3COOH\rightarrow CH_3COONa +CO_2(g)+H_2O[/tex]

The answer is D. As chlorophyll a increases, we would expect dissolved oxygen to decrease and because benthic organisms are animals, they too would decrease.

The speeds of  the centre of mass is 2 2.0 m/s and block 2 is 4 m/s.

The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.

(a) By conservation of momentum, the velocity of the center of mass is unchanged, i.e., 2.0 m/s.

(b) The speed of the center of mass = (m1v1+m2v2) / (m1+m2)

Since the second mass is initially at rest, vcom = m1v1 / (m1+m2)

Therefore, the initial v1 = vcom (m1+m2) / m1 = 2.0 m/s x 6 = 12 m/s

Since the second mass is initially at rest, v2f = v1i (2m1 /m1+m2 ) = 12 m/s (2/6) = 4 m/s

The speeds of  the centre of mass is 2 2.0 m/s and block 2 is 4 m/s.

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We have that from the Question"Conduction is the movement of heat energy because of the collision of" it can be said that

Conduction is the movement of heat energy because of the collision of  of molecules

From the Question we are told

Conduction is the movement of heat energy because of the collision of...

A. The collision of molecules

B. The repulsion of molecules away from each other

C. Cold inside of large molecules

D. Energy of molecules breaking down

Generally

molecules  collide with each  the at high kinetic energy and this exercise of molecule causes heat as a phenomenon to occur

Therefore

Conduction is the movement of heat energy because of the collision of  of molecules

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Answer:

Explanation:

We can use one of the SUVAT equations like:

[tex]s = ut + \frac{1}{2} a^{2}[/tex]

where s = displacement, u = initial velocity, a = the acceleration and t = time.

To get the velocity of the eagle, we have to look at motion of the fish first, using the SUVAT equation form above, therefore:  

Vertical motion, which is going downwards

displacement = 6.1 m

Initial velocity = 0 m/s ,

acceleration = 9.8 [tex]m/s^{2}[/tex]

So, we need to find the time.

[tex]6.1 = 0t + \frac{1}{2} 9.8t^{2}\\6.1 = 4.9t^{2} \\t^{2}= \frac{6.1}{4.9}\\t = \sqrt{1.2448}\\t = 1.116 s[/tex]

Now with the time, we can look at the horizontal motion of the fish, where the variable of the initial velocity, u, is what we need to find, which is also the velocity of the eagle:

Acceleration = 0 [tex]m/s^{2}[/tex]

Displacement = 7.9 m ,

time = 1.116 seconds we need to find Initial velocity (u).

[tex]7.9 = v*1.116 + \frac{1}{2} 0*1.116^{2}\\7.9 = 1.116v \\v= \frac{7.9}{1.116} \\ v= 7.1 m/s[/tex]

Therefore, velocity of the eagle = 7.1 m/s

Answer:

Kinetic energy of the ball is 25 joules.

Explanation:

Mass of the snowball, m = 2 kg

Speed of the ball, v = 5 m/s

Let E is the kinetic energy of the snowball. The energy possessed due to the motion of an object is called its kinetic energy. Mathematically, it is given by :

[tex]E=\dfrac{1}{2}mv^2[/tex]

[tex]E=\dfrac{1}{2}\times 2\times 5^2[/tex]

E = 25 joules

So, the kinetic energy of ball is 25 joules. Hence, this is the required solution.

Answer:

40.59 years

Explanation:

Use the decay law of radioactivity

[tex]N = N_{0}e^{-\lambda t}[/tex]

Where, λ is the decay constant

λ = 0.6931 / T

where, T is the half life

λ = 0.6931 / 10 = 0.06931 per year

So, N = 6% of N0

[tex]0.06 = e^{-0.06931\times t}[/tex]

By solving we get

t = 40.59 years

The tension in the wires must be equal to the weight of the hooked weight for it to be in equilibrium, so it is not possible for the two wires to exert forces with magnitudes of 0.60 N and 0.70 N on the hooked weight.

The tension in the wires must be equal to the weight of the hooked weight for it to be in equilibrium. Since the gravitational force acting on the weight is 1.0 N downward, the sum of the magnitudes of the tensions on the two wires must also be 1.0 N to cancel out the gravitational force. Therefore, it is not possible for the two wires to exert forces with magnitudes of 0.60 N and 0.70 N on the hooked weight.

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Answer;

A) ∠1 and ∠2

Explanation;

Supplementary angles form a straight line and have a sum of 180 degrees. Supplementary angles do not have to be congruent or adjacent. Angle 1 and angle 2 are supplementary angles.

Complementary angles on the other hand are two angles whose sum is 90 degrees. Supplementary and complementary angles do not have to be adjacent (sharing a vertex and side, or next to), but they can be. angles sum right angle.

John Watson's demonstration of classical conditioning with Baby Albert involved pairing a loud noise (UCS) with a white rat (CS) to elicit a fear response (CR) in Albert, which later generalized to similar furry objects.

John Watson's experiments with Baby Albert are classic demonstrations of classical conditioning. Watson and his graduate student, Rosalie Rayner, used this method to show how a neutral stimulus, when paired with an unconditioned stimulus, can evoke a conditioned response. In the case of Little Albert, the unconditioned stimulus (UCS) was the loud noise, and the unconditioned response (UCR) was fear from the noise. The conditioned stimulus (CS) became the white rat after it was repeatedly paired with the loud noise. Soon, the mere presence of the white rat evoked the conditioned response (CR), which was fear. Later, stimulus generalization occurred when Little Albert started to fear similar furry objects.

Final answer:

A mathematical equation predicting physical phenomena is a scientific law, which includes formulas like the Law of Conservation of Energy. Mathematical models and dimensional analysis also play roles in understanding and predicting physical systems.

Explanation:

A mathematical equation that predicts how a physical phenomenon will behave is often referred to as a scientific law. These laws are descriptions, frequently formulated mathematically, which represent the outcomes of repeated experiments or observations within a specific context. For instance, the Law of Conservation of Energy, which is a fundamental concept in physics, can be summarized by a mathematical equation that is crucial for understanding energy transfer and transformation in a closed system.

In the context of physics and engineering, mathematical models are instrumental in outlining physical phenomena using mathematical frameworks like equations and inequalities. Dimensional analysis is one method that utilizes basic principles of dimensions and can help in qualitatively understanding physical systems and predicting quantitative responses to changes in parameters, even with limited detailed knowledge of the system.

It will be attracted most to your positively charged hair. This is why it will make it stand on end. Unlike charges attract, like charges repel.

Scientists in different parts of the world repeat an experiment several times and get the same result to make conclusions reliable is the most likely reason why experiments are repeated to produce the same result, therefore the correct answer is option D

Scientific claims are statements made in science based on an experiment.

These Scientific claims are backed by the experimental data and their true results obtained from scientific investigation and experimentation.

A repeated experiment should provide the same outcomes when carried out by several individuals at various periods and preferably, but not always, under comparable circumstances. Consistent experiments must be conducted by renowned scientists who are unrelated to the claimant. 

Thus, The most likely explanation for why experiments are repeated to produce the same result is that scientists around the world do so in order to draw reliable conclusions. As a result, option D is the best response.

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