Use the information and table to answer the following question! A skydiver dives from an airplane. air resistance is measured each second following the skydiver’s jump.
Time After Jump Weight Air Resistance
(seconds) Newtons (N) Newtons (N)
1 seconds 500N 200N
2 seconds 500N 300N
3 seconds 500N 400N
4 seconds 500N 500N
Which statement BEST identifies the skydiver's speed at each second?
a. The skydiver has the slowest speed at 2 seconds
b. The skydiver has the fastest speed at 4 seconds
c. The skydiver has the sloweat speed 1 second
d. The skydiver has the fastest speed at 3 seconds

We know

\(\boxed{\sf Momentum=Mass\times Velocity}\)

\(\\ \sf\longmapsto Momentum=2000(20)\)

\(\\ \sf\longmapsto Momentum=40000kgm/s\)

The angular speed of the ride is 0.533π rad/s.

The speed of an object, which is a scalar quantity in everyday usage and kinematics, is the size of the change in that object's position over time or the size of the change in that object's position per unit of time.

Given that, to complete one rotation the ride takes 3.75 sec.

The angle traversed in one revolution is 2π.

In physics, the rotational velocity or angular velocity also referred to as the angular frequency vector, is a pseudovector that illustrates how quickly an object's angular position or orientation changes over time.

The formula of angular speed is  ω = θ /t

Here  θ = 2π and  t = 3.75

The angular speed is

ω = 2π/3.75

ω = 0.533π rad/s

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For curved mirror, all points have same normal and angle of incidence is also equal to angle of reflection.

A curved mirror is a mirror with curved reflecting surface and the surface may be convex or concave. Most of the curved mirrors have surfaces that are shaped like part of sphere but other shapes are sometimes used in the optical devices.

For a curved mirror, all points have same normal and the angle of incidence is also equal to angle of reflection. According to the laws of reflection, incident ray, reflected ray and normal all lie on same plane. For  curved mirror, normal remains the same at all points along the curved mirror.

Angle made between the incident ray and normal is the same as the angle made between reflected ray and the normal. Therefore, angle of reflection is equal to the angle of incidence.

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Answer:

The answer to this is C) 100N

Answer:

Netball is a ball sport for two teams of seven players it's rules are published in print and online by the international netball federation Games are played on a rectangular court divided into thirds with a raised goal at coach short end

Explanation:

It will help you

(1.1) The deceleration of object A is - 3.6 m/s².

(1.2) The magnitude of the displacement of Object A to the left is 945 m.

(1.3) The object further to the right at 25 s is B with distance of 200 m.

(1.4) The distance covered by Object B in the last 15 seconds 870 m.

(1.5) The total distance traveled by object A is 1,050 m

(1.6) The velocity of object B 25s after it has started moving is 35.6 m/s.

(1.1) The deceleration of object A is calculated by applying the following method.

a = Δv/Δt

where;

a = (0 - 18) / ( 20 - 15)

a = - 3.6 m/s²

(1.2) The magnitude of the displacement of Object A to the left is calculated as;

Displacement = area under the curve;

D = ¹/₂ [(20s - 0s)(15s - 10s) x (18 m/s - 0 m/s)]  +  ¹/₂ (25 s - 20 s)(18 m/s - 0 m/s)

D = 900 m + 45 m

D = 945 m

(1.3) The object further to the right at 25 s is calculated as follows;

A =  18 m/s x 25 s = 450 m

B = 26 m/s x 25 s = 650 m

difference = 650 m - 450 m = 200 m

(1.4) The distance covered by Object B in the last 15 seconds of its motion is calculated as follows;

at t = 25 s, v = 26 m/s

at t = 40 s, v = 38 m/s

Δx = (40 x 38) - (25 x 26)

Δx = 870 m

(1.5) The total distance traveled by object A is calculated as follows;

between 0 to 30 s, D = 945 m + 45 m = 990 m

between 30 s to 40 s = ¹/₂(35 s - 30s)(8 m/s) + (40 s - 35 s)(8 m/s) = 60 m

total distance = 990 m + 60 m = 1,050 m

(1.6) The velocity of object B 25s after it has started moving is between 10 s and 35 s;

15 s --------> 26 m/s

35 s ------> ?

40 s -------> 38 m/s

(35 - 15)/(40 - 15) = (? - 26) / (38 - 26)

0.8 = (? - 26) / 12

? - 26 = 9.6

? = 35.6 m/s

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The force that the other person must  apply is 75 N in opposite direction (right).

Applied force is defined as the force exerted on an object by another body or object.

The force applied by the other person is determined by applying Newton's second law of motion as follows;

F1  - F2= ma

where;

When an object moves at constant, acceleration = 0

F1 - F2 = 0

F1 = F2

F1 = 75 N, then F2 = 75 N in opposite direction.

Thus, the force that the other person must  apply is 75 N in opposite direction (right).

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The charge of a particle in a magnetic field can be determined by measuring the force, velocity, and strength of the magnetic field using the Lorentz force equation. There are various methods to measure the charge, such as using a particle accelerator or mass spectrometer.

In a magnetic field, charged particles experience a force that can be used to determine their charge. This force, known as the Lorentz force, is given by the equation F = q(v x B), where F is the force, q is the charge of the particle, v is the velocity of the particle, and B is the strength of the magnetic field.

To determine the charge of a particle in a magnetic field, you can measure the velocity of the particle and the strength of the magnetic field, and then measure the force experienced by the particle. By rearranging the equation F = q(v x B), you can solve for the charge q.

It is important to note that the Lorentz force only applies to charged particles that are in motion. If the particle is stationary, it will not experience any force in a magnetic field.

In practice, there are many ways to measure the charge of a particle in a magnetic field, such as using a particle accelerator or a mass spectrometer. These techniques involve manipulating the motion of the particle in a controlled way and measuring the resulting forces and velocities to determine its charge.

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Complete question:

How can I know the charge of a particle in a magnetic field?

Answer: 5 joules

Explanation:

mass=m=2.5kg

Velocity=v=2m/s

Kinetic energy=ke

ke=(m x v x v)/2

ke=(2.5 x 2 x 2)/2

Ke=10/2

Ke=5

Kinetic energy=5 joules

The kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s is 5 Joules.

The energy which an item has as a function of motion is determined by the initial energy. It is described as the effort required to propel a material body from rest to the given velocity.

It is given that:

Mass of the remote-controlled car = 2.5 kg

Velocity of the car = 2 m/s

As we know,

Kinetic energy = k

k = (mv²)/2

As we know,

The mass is a tangible body's mass is the amount of matter it possesses. It's also a metric of inertia or the resistance to velocity when a net force is exerted.

m = 2.5 kg

v = 2 m/s

k = (2.5×2²)/2

k = 10/2

k = 5 Joules

Thus, the kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s is 5 Joules.

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Answer:

Subtract the mass of the cylinder from the mass of the cylinder when it contains gasoline. This is the mass of the gasoline. Divide this figure by the volume, 100 ml, to get the density.

Answer: no exact answer

=

Explanation:

Answer:

Your average velocity would be 20 m/s.

Explanation:

hope this helped!

Answer:

E = 120.77 J

Explanation:

Given that,

Mass of a baseball, m = 0.143 kg

Velocity of a baseball, v = 41.1 m/s

We need to find the kinetic energy of the baseball. We know that the kinetic energy of an object is associated with its motion. It can be given by the formula as follow :

\(E=\dfrac{1}{2}mv^2\\\\E=\dfrac{1}{2}\times 0.143\ kg\times (41.1\ m/s)^2\\E=120.77\ J\)

So, the kinetic energy of the baseball is 120.77 J.

The kinetic energy of the baseball is 120.8 J.

The kinetic energy of an object is associated with its motion. It can be related to the mass and velocity as

K.E = 1/2 mv²

Given is the Mass of a baseball, m = 0.143 kg and Velocity of a baseball, v = 41.1 m/s

substitute the values, we have

K.E = 1/2 x 0.143 x (41.1)²

K.E =  120.77 J

Hence, the kinetic energy of the baseball is 120.8 J.

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Answer:

B

Explanation:

a force acting upon an object increases that objects acceleration

Answer:

B

Explanation:

K12 is a term that refers to the education system that covers primary and secondary education, typically from kindergarten through 12th grade. A K12 test would, therefore, be an assessment or examination that is designed for students within this educational framework.

Question 1:

DNA (deoxyribonucleic acid) is a molecule that carries the genetic instructions for the development, functioning, and reproduction of all living organisms. It consists of two strands twisted into a double helix structure and is composed of nucleotides containing a sugar-phosphate backbone and nitrogenous bases (adenine, thymine, cytosine, and guanine).

Question 2:

The cell needs to make copies of DNA before dividing to ensure that each daughter cell receives a complete set of genetic information. During cell division, the DNA is replicated through a process called DNA replication, where each strand of the double helix is used as a template to create two identical DNA molecules. This ensures genetic continuity and the transmission of genetic information to offspring cells.

Question 3:

Mutations in DNA can be caused by errors that occur during DNA replication, where mistakes or changes in the nucleotide sequence may occur. Additionally, mutations can be caused by external factors known as mutagens, such as radiation, certain chemicals, or environmental factors, which can damage or alter the DNA sequence.

Question 4:

When we say that DNA strands are complementary, it means that the nucleotide bases on one strand pair specifically with their complementary bases on the opposite strand through hydrogen bonding. Adenine (A) always pairs with thymine (T), and cytosine (C) always pairs with guanine (G). This complementary base pairing ensures the accurate replication and transcription of DNA.

Question 5:

During DNA replication, the new DNA strand formed is complementary to the original template strand. This means that the sequence of nucleotides in the new strand is precisely complementary to the sequence in the original strand. However, it is important to note that both strands of the double helix are used as templates during replication, resulting in two new DNA molecules, each with one original strand and one newly synthesized complementary strand. Therefore, each new DNA molecule consists of one original strand and one newly synthesized strand, making them identical to each other and slightly different from the original DNA molecule.

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The complete question is:

Question 1: What is DNA?

Question 2: Why must the cell make copies of DNA before it can divide?

Question 3: What causes mutations in DNA?

Question 4: What does it mean for DNA strands to be complementary?

Question 5: How is the new DNA strand formed during replication different from the original strand?

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Sure, here are 10 questions regarding how physical health affects social media, directed toward Gen Z, Millennials, and Gen X:

Gen Z:

1. How often do you use social media in a day? Do you feel that it has an impact on your physical health?

2. Do you find it difficult to take a break from social media and disconnect from your devices? How does this affect your sleep patterns?

3. Have you ever experienced any physical symptoms such as headaches, eye strain, or neck pain due to excessive social media use? If so, how did you manage these symptoms?

4. How do you balance your time between physical activity and social media use? Do you think you spend more time on social media than being physically active?

5. Do you think that social media contributes to the pressure to maintain a certain physical appearance? How do you deal with this pressure?

Millennials:

1. How has your physical health been impacted by the use of social media? Do you feel that you spend too much time on your devices?

2. Have you ever felt overwhelmed or stressed due to the constant barrage of social media notifications and updates? How did you deal with these feelings?

3. Do you think that social media can contribute to a sedentary lifestyle? How do you combat this potential issue?

4. Have you ever experienced any physical symptoms such as carpal tunnel or back pain due to excessive social media use? How did you manage these symptoms?

5. How do you maintain a healthy balance between social media use and physical activity? Do you think you need to make changes to this balance?

Gen X:

1. How has social media affected your physical health? Have you noticed any changes in your physical activity levels or sleep patterns due to social media use?

2. Have you ever experienced any physical symptoms such as eye strain, headaches, or neck pain due to excessive social media use? How did you manage these symptoms?

3. Do you think that social media contributes to a sedentary lifestyle? How do you combat this potential issue?

4. How do you balance your time between social media use and physical activity? Do you feel that you need to make changes to this balance?

5. Do you feel that social media contributes to the pressure to maintain a certain physical appearance? How do you deal with this pressure?

The word Core means: The sun's center.

Depending on the context, the word "core" can indicate many different things, but when it comes to the Sun, it typically refers to option the Sun's center. The nuclear fusion reactions that take place in the Sun's core are where the energy for the star is produced. The core of the sun is the area where nuclear fusion processes occur, producing a huge quantity of heat and energy. The sun's core has the highest temperature, up to a whopping 27 million degrees Fahrenheit. Since the sun's energy is produced in the core and radiates outward to its surface and beyond, the core is known as the sun.

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Answer:

see below

Explanation:

1. density = mass / volume

2. kg/mL,  g/cm³

3. volume = mass / density

4. mass = density x volume

5.  

d = m / v

d = 32.9 g / 45.78 mL

d = 0.72 g/mL

6.

vol = m / d

vol = 0.62 g / 120g/cm³

vol = 0.00517 cm³

7.

m = v * d

m = 2.07 g/mL * 60.9 mL

m = 126.063 g

Answer: i think c

Explanation:QA: “What is ordinary glass made of ?”

Glass is mostly silica, or silicon dioxide, present as quartz in many types of sand. Pure silica forms a highly transparent glass, but has a very high melting or softening temperature, around 1700°C. Even at such high temperatures it is highly viscous and difficult to work. Its use is largely confined to applications requiring high transparency to ultra-violet and infra-red radiation, stability at elevated temperatures or low thermal expansion coefficient.

“Ordinary glass” windows and drinking vessels are typically made from soda-lime glass, containing silica with around 25% sodium, calcium and other oxides, which together reduce the softening temperature to roughly 500–600°C

Answer:

v=30m/s

Explanation:

m = 1500kg

v = 30m/s

t = 25s

The velocity time graph is parallel to the time axis,

that means The Velocity is constant. ('constant' means remains same).

Therefore, after 25s, v=30m/s

Answer:

the answer is B but I'm not completely sure

The reason for this observation is  that the shed is not made of iron or steel.

The special magnetic property of iron is called ferromagnetism. As a result of this special magnetic property, iron can be attracted easily by a magnet. Steel is made from iron so it is also highly magnetic.

In the question, a magnet placed against the wall of a metal shed falls to the ground, where it attracts a nail. The reason for this is that the shed is not made of iron or steel.

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A decigram is a unit of weight measurement that is equivalent to one-tenth of a gram or 100 milligrams.

Therefore, a decigram is ten times more in weight than a milligram. This means that if an object weighs one milligram, it will weigh ten decigrams if the weight is converted to decigrams. The use of these units of measurement is essential in various fields such as medicine, chemistry, and physics, where accurate and precise weight measurements are necessary.

Understanding the relationship between different units of measurement is vital in converting and calculating weight measurements. It is important to note that proper conversion of units of measurement is crucial in ensuring accurate and consistent results in scientific experiments, laboratory work, and medication dosages.

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Answer:

The type of bond is ionic bond also called electrovalent bond.

Explanation:

This ionic bond is formed through an electrostatic attraction between two oppositely charged atoms.

Hope this helps! :)

And also this question was already answered on Brainly if you wanna check it out.

Answer: nun

Explanation:

When working with solutions, it is important to use the appropriate glassware to ensure accurate measurements.

In this case, if you wish to dissolve approximately 1 gram of NaCl in approximately 100 ml of water, it is recommended to use a 200 ml volumetric flask instead of a 200 ml beaker.

A volumetric flask is designed to hold a specific volume of liquid at a specific temperature, whereas a beaker is not as precise and its volume can vary depending on factors such as temperature and meniscus.

A volumetric flask has a narrow neck and a flat bottom, and is designed to deliver a specific volume of liquid when filled to the line etched on the neck at a specific temperature, which is usually 20°C. Using a volumetric flask ensures that the concentration of the solution will be accurate, since the volume of the flask is precisely known.

Therefore, if you need to prepare a solution with a specific concentration, it is recommended to use a volumetric flask rather than a beaker, which is more appropriate for general mixing and handling of solutions.

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When the resistance in a constant voltage circuit is doubled, the power dissipated by that circuit will decrease to one-half its original value. The correct option is (C).

This is because power dissipated by a circuit is directly proportional to the square of the current flowing through it and inversely proportional to the resistance of the circuit.

Mathematically, the relationship can be represented as:

P = I²R, where P is power, I is current, and R is resistance.

If resistance (R) is doubled, then the current (I) will be halved to maintain the constant voltage. Using the relationship above, we can see that the power (P) will decrease by a factor of four (2²) due to the halving of the current.

Therefore, the correct answer is option C: If the resistance in a constant voltage circuit is doubled, the power dissipated by that circuit will decrease to one-half its original value.

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Answer: I don't know

Explanation:

In the first scenario, the energy would be conserved in the system of the girl-wall, The correct answer is option c

In the second scenario, the energy would be conserved in the system of the person-trampoline-earth, The correct answer is option c

In the third scenario, the energy would be conserved in the system of the box-ramp-earth, The correct answer is option a

In the fourth scenario, in a realistic scenario, the energy would not be conserved in any of the given systems due to external work done on the system. The correct answer is option e

For the first scenario of a person wearing roller skates, assuming there is no external work done on the system, the system of the girl-wall would be the appropriate system to consider. The energy would not be conserved in any other system, as there would be external work done on the system due to forces acting on the girl, wall, or both. Therefore option c is correct.

For the second scenario of a person jumping on a trampoline, assuming there is no external work done on the system, the appropriate system to consider would be the system of the person-trampoline-earth, as the energy would be conserved within this closed system.

None of the other systems would conserve energy, as external work would be done on the system due to the forces acting on the person, trampoline, and/or Earth. Therefore option c is correct.

For the third scenario of pushing a box up a ramp, assuming there is no external work done on the system, the appropriate system to consider would be the system of the box-ramp-earth, as the energy would be conserved within this closed system.

None of the other systems would conserve energy, as external work would be done on the system due to the forces acting on the box, ramp, and/or Earth. Therefore option a is correct.

For the fourth scenario of two cars colliding and coming to a stop, it is important to note that in a realistic scenario, there would be external work done on the system due to forces such as friction, air resistance, and deformation of the cars.

Therefore, the energy would not be conserved in any of the given systems. However, if the scenario were simplified to only consider idealized, perfectly elastic collisions in a vacuum, then the system of both cars would conserve energy. Therefore option e is correct.

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One example of a fraction that is sometimes used to approximate pi is 22/7. This is a common approximation of pi that is often used in mathematics and engineering.

A fraction is a mathematical expression used to represent a part of a whole or a portion of a quantity. Fractions are a fundamental concept in mathematics that are used in many different contexts and are essential for understanding more advanced mathematical concepts.

Fractions is important in many areas of life, including cooking, construction, and finance. In finance, understanding fractions is important for calculating interest rates, percentages, and ratios. For example, the fraction 1/2 represents one out of two equal parts or half of the whole. Fractions can be used to represent numbers that are not whole, such as 1/4, 3/8, or 7/10. They can also be used in mathematical operations such as addition, subtraction, multiplication, and division.

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Answer:

A) -6.7 cm

Explanation:

An object is placed 15 cm in front of a diverging lens (concave lens)
So u = -15 cm
and f = -12 cm (also given)
So, using the lens formula 1/f = 1/v - 1/u,
1/v = 1/f + 1/u
= [1/(-12)] + [1/(-15)]
= -3/20
So, v  = -20/3 = -6.67 or ≈ -6.7 cm