3) A skateboarder lands on all four wheels after riding a railing. If the skateboarder
has a weight of 900 N and the area on the bottom of a single wheel is 0.0001 m2,
What pressure does the skateboard put on the ground?

A 500 g ball is dropped from a tall building. At one instant the force of drag on the ball was 3.0 N. The magnitude of the ball's acceleration at that instant is: 6 m/s². The correct option is (e)

Given, Mass of the ball = 500 g = 0.5 kg
Force of drag on the ball = 3 N

Let's use Newton's second law of motion:
F = ma
Where, F = force of drag on the ball
m = mass of the ball
a = acceleration of the ball

On substituting the given values in the above formula, we get: 3 = 0.5 × a

Solving for a, we get, a = 6 m/s²Therefore, the magnitude of the ball's acceleration at that instant was 6 m/s².

To know more about "Newton's second law of motion" refer here:

https://brainly.com/question/29775827#

#SPJ11

Answer:

Loyalty-Being loyal is important to being a good citizen because it shows that you acknowledge the effort others have put in to what you are doing and it shows that you enjoy what you are doing. Loyalty is important to a productive community because it promotes good work and effort

Explanation:

Answer:

Approximately \(0.29\; {\rm m \cdot s^{-1}}\).

Explanation:

Make use of the fact that total momentum is conserved in collisions.

The momentum of an object of mass \(m\) and velocity \(v\) is \(p = m\, v\).

The momentum of the two trolleys before the collision would be:

Thus, the total momentum of the two trolleys right before the collision would be \(2\; {\rm kg \cdot m \cdot s^{-1}}\).

Since the two trolleys are stuck to one another after the collision, they could modelled as one big trolley of mass \(m = 3\; {\rm kg} + 4\; {\rm kg} = 7\; {\rm kg}\).

The momentum of the two trolleys, combined, is conserved during the collision. Thus, the total momentum of the new trolley of mass \(m = 7\; {\rm kg}\) would continue to be \(v = 2\; {\rm kg \cdot m \cdot s^{-1}}\) shortly after the collision.

Rearrange the equation \(p = m\, v\) to find the velocity of the two trolleys combined:

\(\begin{aligned}v &= \frac{p}{m} \\ &= \frac{2\; {\rm kg \cdot m \cdot s^{-1}}}{7\; {\rm kg}} \\ &\approx 0.29\; {\rm m \cdot s^{-1}}\end{aligned}\).

Answer:

In what way is iron unique among the elements?

It has the lowest mass per nuclear particle.

Match words at the left to the correct blanks in the sentences on the right. Not all words will be used.

-The energy that drives the expansion of a star into a subgiant or red giant comes from HYDROGEN SHELL FUSION

-Stars with mass greater than about 8 solar masses are considered HIGH-MASS STARS

-The final stage of core fusion in a low-mass star is HELIUM FUSION

-Stars that are fusing hydrogen in their cores are MAIN-SEQUENCE STARS

-When it dies, a high-mass star explodes as a SUPERNOVA

-A star that is expanding (into a subgiant and then a giant) has a(n) INERT HELIUM CORE

-When it dies, a low-mass star expels a PLANETARY NEBULA

-Stars with masses less than about two solar masses are considered LOW-MASS STARS

Increasing the amplitude by a factor of four times doubles the energy of a simple harmonic oscillator.

The amplitude of a periodic variable is a measure of its change in a single period. The amplitude of a non-periodic signal is its magnitude compared with a reference value. There are various definitions of amplitude, which are all functions of the magnitude of the differences between the variable's extreme values.

Simple harmonic oscillator is an oscillator that is neither driven nor damped. It consists of a mass m, which experiences a single force F, which pulls the mass in the direction of the point x = 0 and depends only on the position x of the mass and a constant k.

A specific example of a simple harmonic oscillator is the vibration of a mass attached to a vertical spring, the other end of which is fixed in a ceiling.

To learn more about Simple harmonic oscillator here

brainly.com/question/28208332

#SPJ4

Answer:

b i think

Explanation:

Answer  

The  answer would be B because the truck has more mass than the car therefore it would take longer for it to stop and that is momentum.

Explanation:

Answer:

\(\boxed {\boxed {\sf a\approx 16.79 \ m/s^2}}\)

Explanation:

Acceleration can be found by dividing the net force by the mass.

\(a=\frac{F}{m}\)

The net force is 68 Newtons. Let's change the units to make later steps simpler.

1 Newton is equal to 1 kg*m/s², so the net force of 68.0 Newtons is also equal to 68.0 kg*m/s².

The mass is 4.05 kilograms.

\(F=68.0 \ kg*m/s^2 \\m=4.05 \ kg\)

Substitute the values into the formula.

\(a=\frac{68.0 \ kg* m/s^2}{4.05 \ kg}\)

Divide. Note that the kilograms (kg) will cancel each other out when dividing.

\(a=\frac{68.0 \ m/s^2}{4.05 }\)

\(a=16.7901235 \ m/s^2\)

Let's round to the nearest hundredth. The 0 in the thousandth place tells to leave the 9 in the hundredth place.

\(a\approx 16.79 \ m/s^2\)

The acceleration is about 16.79 meters per square second.

Answer:

2.6784x10^8 mega joules

Explanation:

joules = watts * seconds

Electrical Energy = Power x Time

Electrical Energy (joules) = watts x seconds in a day

seconds in day 86400 seconds

3100 megawatts = 3.1x10^9 watts

Electrical Energy (joules) = 3.1x10^9 x 86400

Electrical Energy (joules) = 2.6784x10^14 joules

2.6784x10^14 joules = 2.6784x10^8 mega joules

edinformaticscom

https://brainly.com/question/12666523

Zero resistance or capacitance value corresponds to a short circuit, which is the travel of current along an unintended path.

True short circuits happen when electrical circuit wires or wire connections are exposed or broken; they need to be identified and addressed as soon as possible. When there is a low resistance connection between two conductors supplying electricity to a circuit, a short circuit happens.

A "ideal" open circuit would have zero capacitance. A capacitor with 0 capacitance has no electrical charge accumulating on its plates or conductors. Zero capacitance means it can become fully charged as soon as the current is flown through it.

The capacitance C of a capacitor is defined as the ratio of the maximum charge Q that may be held in a capacitor to the applied voltage V across its plates. In other terms, capacitance is the capacity of the device to store the most charge per volt:

C = Q/V.

To know more about capacitance, refer:

https://brainly.com/question/25656682

#SPJ4

Answer:

Explanation:

Momentum P=mass×velocity

1000=800×velocity

1000=800V

V=1000/800=2.5m/s

When an airplane travels 640 miles from Topeka to Houston in 3. 2 hours, going against the wind. The return trip is with the wind and takes only 2 hours. Then the rate of the airplane with no wind is 260 miles/hr, and the rate of the wind is 100 miles/hr

Let Va is the velocity of the airplane

Va is the velocity of the wind

When flying against the wind then

(Va+Vw)*(3.2 hours) = 640

3.2Va + 3.2Vw = 640

3.2Vw = 640 - 3.2Va

Vw = 200 - Va----------------(1)

When flying with the wind:

(Va-V)*(2 hours) = 640km

2Va - 2Vw = 640

Va - Vw = 320 ----------------(2)

Putting the value of VW in equation (2) we get

Va - (200-Va) = 320

2Va = 320 +200

2Va = 520

Va = 260

Putting this value in equation (2)

Vw =Va - 360

Vw = 100

Therefore the rate of the airplane with no wind is 260 miles/hr, and the rate of the wind is 100 miles/hr

Learn more about rates:

https://brainly.com/question/26046491

#SPJ4

The rate of diffusion is directly related to concentration, temperature, and pressure meaning that an increase in concentration, temperature, or pressure results in an increase in the rate of diffusion.

This is because diffusion is a process where particles move from an area of high concentration to an area of low concentration, driven by a concentration gradient. As the concentration gradient increases, more particles move from the high concentration area to the low concentration area, resulting in a faster rate of diffusion.

Temperature also affects the rate of diffusion because it affects the kinetic energy of the particles. At higher temperatures, particles have more kinetic energy and move faster, leading to a higher rate of diffusion.

Pressure affects the rate of diffusion because it affects the concentration gradient. An increase in pressure can compress the gas and increase the concentration gradient, resulting in a higher rate of diffusion.

To know more about the diffusion, here

brainly.com/question/14392880

#SPJ4

Answer:

An electrical charge is created when electrons are transferred to or removed from an object. Because electrons have a negative charge, when they are added to an object, it becomes negatively charged. When electrons are removed from an object, it becomes positively charged.

The process of selecting the optimal action to take from a multitude of possibilities can be characterized as decision making.

Meaning of making decisions:

The basic goal of managerial economics is decision-making. The process of choosing the best course of action from among multiple alternatives can be referred to as decision-making. Whenever there are numerous options, decision-making becomes a challenge.

Decision Making and Economics

Well, making decisions affects everyone's life; they are not just for executives or the corporate sector. Whether a person is employed or jobless, making decisions is important to everyone. Regardless of the work you are now doing, a choice needs to be made. You have several choices to make as a participant.

to know more Economics, visit to:-

https://brainly.com/question/14787713

#SPJ1

The dimension of a physical quantity is the power to which the fundamental units must be raised to, to represent it. Mass, length, time, temperature, electric current, luminous intensity and amount of substance are the fundamental quantities

Temperature is a measure of the degree of hotness or coldness of an object or substance. It is a fundamental concept in physics, chemistry, and engineering and is one of the most commonly measured physical parameters in scientific and industrial applications. The temperature of an object or substance is related to the average kinetic energy of its particles. In other words, the faster the particles are moving, the higher the temperature.  

Temperature is measured using a variety of devices, including thermometers, thermocouples, and pyrometers. The most common unit of temperature is the Celsius (°C) scale, which is based on the freezing and boiling points of water. Another commonly used scale is the Fahrenheit (°F) scale, which is used primarily in the United States.

To learn more about Temperature visit here:

brainly.com/question/11464844

#SPJ4

Telescopes designed to study the earliest stages in galactic lives should be optimized for observations in infrared light. Infrared light has longer wavelengths than visible light, allowing it to penetrate dust and gas clouds more effectively.

This is particularly important for studying the earliest stages of galactic evolution, as these stages often involve dense regions of dust and gas that can obstruct visible light observations. By observing in the infrared spectrum, astronomers can detect the faint emissions from warm dust, molecular clouds, and newly forming stars that are otherwise hidden in the visible range. This enables them to study processes such as star formation, protoplanetary disks, and the evolution of galaxies in their early stages.Therefore, optimizing telescopes for observations in infrared light is crucial for gaining insights into the earliest stages of galactic lives and unraveling the mysteries of galactic evolution.

To know more about telescopes, click here https://brainly.com/question/31634676

#SPJ11

Answer:

H = 6 atoms

K= 2 atoms

O = 2 atoms

Answer:

H is 6 atoms K is2 atoms and O is 2 atoms

Explanation:

Answer:

216 J

Explanation:

h = 1.8

a = 9.8

m = 12.2

GPE = HAM = 216

The gravitational potential energy of a suitcase weighing 120 N sits on a counter 1.8 m high in the airport is 216 Joules.

Gravitational potential energy is the energy which is present inside the body of an object which is at rest. This energy is transformed into kinetic energy as soon as the object changes its state of rest to motion.

The gravitational potential energy of an object can be calculated through the formula:

GPE = m × g × h

where, GPE = Gravitational Potential Energy,

m = mass of the object,

h = height covered by the object

w = m × g

where, w = weight of the object

So, the gravitational potential energy of the object is:

GPE = 120 × 1.8

GPE = 216 Joules

Therefore, the gravitational potential energy of the suitcase is 216 Joules.

Learn more about Potential energy here:

https://brainly.com/question/12807194

#SPJ5

The  is that the velocity of water flow in the pipe on the second floor is 13.6 m/s.

To calculate the velocity of water flow on the second floor, we can use Bernoulli’s principle which states that the pressure and speed of a fluid are inversely proportional to each other. Pressure + (1/2) * Density * Velocity^2 + Density * g * Height

= Constant (where g = acceleration due to gravity)In this problem, since the pressure remains unchanged, we can eliminate the first term on both sides of the equation for both positions. Using Bernoulli’s principle for position 1 and 2 as:

(1/2) * Density * Velocity1^2 + Density * g * H1 = ConstantPosition 2:

(1/2) * Density * Velocity2^2 + Density * g * H2

= ConstantConstant

= (1/2) * Density * Velocity1^2 + Density * g *

H1Taking the difference of the above equations we get:1/2 * ρ * (V2^2 - V1^2)

= -ρghV2^2 - V1^2

= -2ghV2^2 = V1^2 - 2ghV2

= √(V1^2 - 2gh)

The negative sign is ignored as it represents the direction of flow. Putting the values we get:

V2 = √(15^2 - 2 × 9.81 × 3)

= 13.6 m/s

To know more about velocity visit:

https://brainly.com/question/30559316

#SPJ11

Vega is a main-sequence star of spectral type A, with a mass of about 2.1 times that of the Sun. As a main-sequence star, Vega is burning hydrogen in its core to produce energy, and it will continue to do so for several billion years.

After it exhausts the hydrogen in its core, Vega will enter a new phase of its life known as the red giant phase. During this phase, Vega will expand to become a much larger star, with a radius that may be several hundred times larger than its current radius. The outer layers of Vega will cool and become less luminous, causing the star to appear redder in color.

As the red giant phase progresses, the core of Vega will contract and heat up, eventually becoming hot enough to fuse helium into heavier elements. This process will release a large amount of energy, causing the outer layers of the star to be blown away in a massive explosion known as a planetary nebula. The hot, compact core that remains will eventually cool down and become a white dwarf, the final stage of stellar evolution for stars like Vega.

So, Vega is expected to expand into a red giant star before evolving into a white dwarf.

To know more about luminous refer here

https://brainly.com/question/29564864#

#SPJ11

I will choose copper, because the thermal conductivity is the best.

Answer:

False, Sunspots appear dark (in visible light) due to their low temperature(cooler) than rest of the sun

Explanation:

Sunspots appear dark because they are much cooler( have low temperature than the rest of the surface contained by Sun. As they appear dark, but still they have very temperature that's why so hot. Sunspots have temperatures ranges  3,500 Celsius (3773 kelvin) and the surrounding surface of the sun has a temperature much higher of about 5,500 Celsius(5773 Kelvin). Even if we see a sunspot alone in space,  it will glow so brightly.

Learn more about sunspots :

https://brainly.com/question/27774496

#SPJ4

The heat that is evolved by the environment is 36.42 kJ.

We know that heat is a form of energy that can be known for the fact that it could lead to a change in the temperature of the object. We have to note that the energy that is released is a sum total of all the process that are involved here.

We know that;

H = (15 * 4.18 * (135 - 100)) + (15 * 2240) + (15 * 4.18 * (100 - 90))

H = 2194.5 + 33600 + 627

H = 36.42 kJ

The total heat that has been evolved would now be 36.42 kJ.

Learn more about heat:https://brainly.com/question/28302909

#SPJ1

To determine which subatomic particle has a longer lifespan, we compare the average lifetimes of the tau lepton and the neutral pion. The average lifetime of the tau lepton is 2.906 x 10^-12 seconds, and the average lifetime of the neutral pion is 8.4 x 10^-17 seconds.

Comparing these values, we can see that the average lifetime of the tau lepton (2.906 x 10^-12 seconds) is significantly longer than the average lifetime of the neutral pion (8.4 x 10^-17 seconds).

To calculate how many times longer the lifespan of the tau lepton is compared to the neutral pion, we divide the average lifetime of the tau lepton by the average lifetime of the neutral pion:

(2.906 x 10^-12 seconds) / (8.4 x 10^-17 seconds) = 3.453 x 10^4

Therefore, the tau lepton has a lifespan that is approximately 3.453 x 10^4 (34,530) times longer than the neutral pion.

Answer:

first one down second one up

Explanation:

Answer:

So, 20W of light energy is produced per second.

Explanation:

a) To calculate the current flowing through the bulb, we use the formula:

I = P / V

Where P is the power in watts (100 W) and V is the voltage (220 V).

I = 100 / 220 = 0.45 A

b) To find the light energy produced per second, we use the formula:

E = P x t

Where P is the power in watts (100 W) and t is the time in seconds.

As we know only the power and not the time, we have to calculate the energy efficiency of the bulb.

Efficiency = (Energy output/ Energy input) * 100

Efficiency = (Light energy output / Total energy input) * 100

Let's assume that the bulb is on for 1 sec

Efficiency = (Light energy output / 100W) * 100

Light energy output = (Efficiency / 100) * 100W = 20W

Efficiency = 20%

So, 20W of light energy is produced per second.

Answer:

So, 20W of light energy is produced per second.

Explanation:

a) To calculate the current flowing through the bulb, we use the formula:

I = P / V

Where P is the power in watts (100 W) and V is the voltage (220 V).

I = 100 / 220 = 0.45 A

b) To find the light energy produced per second, we use the formula:

E = P x t

Where P is the power in watts (100 W) and t is the time in seconds.

As we know only the power and not the time, we have to calculate the energy efficiency of the bulb.

Efficiency = (Energy output/ Energy input) * 100

Efficiency = (Light energy output / Total energy input) * 100

Let's assume that the bulb is on for 1 sec

Efficiency = (Light energy output / 100W) * 100

Light energy output = (Efficiency / 100) * 100W = 20W

Efficiency = 20%

So, 20W of light energy is produced per second.

Answer:

Mass and kinetic energy have a positive relationship, which means that as mass increases, kinetic energy increases, if all other factors are held constant.

In this state, Kinetic energy is equal to half of the product mass and velocity. SI unit is joules. So it's if the mass is doubled then the kinetic energy also gets doubled.

The horizontal force being applied by the partner is 692.8 N.

The horizontal force being applied by the partner is determined by applying Newton's second law of motion.

Mathematically, the Newton's second law of motion is given as;

F = ma

where;

The total weight of the trapeze artist can be resolved into horizontal component and vertical component.

The formula for the horizontal component of the weight of the trapeze artist is given as;

Fx = F cosθ

Wx = W cosθ

where;

Wx = ( 8 x 10² N ) x cos (30)

Wx = 692.8 N

Thus, the horizontal force applied by the partner is a function of the horizontal component of the weight of the trapeze artist.

Learn more about horizontal force here: https://brainly.com/question/12979825

#SPJ1