Lesson 18, Physical Science
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Q1. Describe how the skater's kinetic and potential energy change as the skater descends. Explain what happens to the total energy (potential energy + kinetic energy) in terms of the Law of Conservation of Energy.
Change the skater with the "Choose Skater" button.






Q2. Describe any changes to the bar graphs you see when you change skaters. Is the Law of Conservation of Energy still obeyed?

Reset the half-pipe and click on the "Show Grid" check box. Grab the track (drag the track with a right-click) and set the bottom of the track at "zero" height.
Select the default, 75 kg, PhET skater and set him at 5.0 meters above the zero and allow him to skate.
Q3. How much potential energy does the skater have at 5.0 meters? How much kinetic energy does the skater have at 0.0 meters?

Q4. If a 20.0 kg skater started his skate at 10 meters height (on Earth):
How much potential energy would the skater have at the start of skating?
How much kinetic energy would the skater have at the start of skating?
How much potential energy would the skater have at zero height?
How much kinetic energy would the skater have at zero height?


Create this skate path:


Start the skater on the left side and observe. Then answer the following question:
Q5. Does the skater have enough energy to make it all the way to the right side? Explain why or why not.

If the skater starts on the left on the following path:


Q6. Answer the parts of this question based upon the above skater path. If the skater starts at point "A":

Where does the skater have the maximum potential energy?
Where does the skater have the minimum potential energy?
Where does the skater have the minimum kinetic energy?
Where does the skater have the maximum kinetic energy?
At which two points would the skater have about the same kinetic energy?

Q7. Based upon the equation for potential energy, how do you expect the potential energy to change when the gravity is lower than it is on Earth (for example, gravity on the moon is 1.6 m/s2 )?

Use the option boxes to move the skater to Jupiter, where acceleration due to gravity is 26 m/s2.

Q8. Describe any differences you see in potential and kinetic energy between the Earth and Jupiter.
Use the option boxes to move the skater to the moon where the acceleration from gravity is 1.6 m/s2.

Q9. Describe any differences you see in potential and kinetic energy between the Earth and the moon.

Q10. Does this agree with the prediction you made in Q7?

Q11. How high must a 20 kg skater start at to have a kinetic energy of 360 joules at a height of 0 meters?

Q12. What is the total energy of the 60.0 kg skater before she starts her ride, 12 meters above the ground?

Q13. If you throw a 2.0 kg basketball straight up in the air, at what height will the basketball have 160 J of potential energy?

Q14. Describe what happens to the bar graphs when you change the amount of friction. Is the Law of Conservation of Energy still obeyed?

Answer:

As with other forms of electromagnetic radiation, X-rays can be described as coupled waves of electric and magnetic fields traveling at the speed of light (about 300,000 km, or 186,000 miles, per second).

Explanation:

hope it's help

Answer:

The gasoline engine would have:

intake stroke

compression stroke

power stroke

exhaust stroke        

This is a total of 2 revolutions and 4 thermodynamic cycles

So the number of thermodynamic cycles is twice the rpm of the engine

Answer:

the faster you move the greater, the drag force acting against the object.

Explanation:

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You almost certainly meant to say the particle's position is a function of time t, not some other variable x (or vice versa) so that

s(t) = 5t sin(2t)

Differentiate s(t) to get the instantaneous velocity of the particle at time t. By the product rule,

s'(t) = 5 sin(2t) + 10t cos(2t)

Evaluate the derivative at t = 0 :

s'(0) = 0

The instantaneous velocity at t = 0 is 0 m/s.

To find the instantaneous velocity at t = 0, we need to take the derivative of the position function s(t) with respect to time (t). The derivative of s(t) gives us the velocity function v(t), which represents the particle's velocity at any given time t.

Given the position function s(t) = 5t * sin(2t), we find the velocity function v(t) by taking the derivative:

v(t) = d/dt (5t * sin(2t)).

To find the velocity at t = 0, we substitute t = 0 into the velocity function:

v(0) = 5 * 0 * sin(2 * 0) = 0.

Therefore, the instantaneous velocity of the particle at t = 0 is 0 m/s. This means that at t = 0, the particle is momentarily at rest, and its velocity is neither increasing nor decreasing at that specific moment.

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Answer:

0.163934

Explanation:

Kinetic friction can be calculated by coefficient of kinetic friction * normal force. In this question the Mg is = to normal force (12.2 N). Therefore using sum of forces equations we get 2N = coefficient of kinetic friction * 12.2N. divide 2 by 12.2 to get the coefficient.

Answer:

[tex] \huge\boxed {\sf Velocity}[/tex]

Explanation:

The unit of measurement is m/s hence it can not inertia or force because the unit of intertia and force are kg m² & kg⋅m/s² respectively, hence Option C and Option D can not be the right answer.

To understand the final answer one must know the difference between velocity and speed.

Velocity is a vector quantity which is direction specific. It's the displacement per unit time, the displacement is an vector quantity.

[tex] \sf \: Velocity = \frac{Displacement }{Time} [/tex]

Velocity can be positive negative or zero!

Speed is a scalar quantity which tells the distance covered in unit time. since it's a scalar it have magnitude only, not direction.

[tex] \sf \: Speed = \frac{Distance }{Time} [/tex]

Speed is always either zero or positive.

In the question it tells the baseball is flying through the air at 40 m/s east,

if it was only 40m/s with no direction then it would be speed. but the east is indicating the direction and velocity includes the direction hence the given measurement represents Velocity.

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A star will become a white dwarf when its nuclear fuel is finished because of no more emission of heat and light.

When the end of the nuclear burning stage of a star comes, such a star expels most of its outer material creating a planetary nebula until only the hot core remains. When this core settles down, it will become a young white dwarf.

So we can conclude that a star will become a white dwarf when its nuclear fuel is finished because of no more emission of heat and light.

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Explanation:

Sound travels faster In solids than liquid than gases

Speed of sound is highest in solids, and higher in liquids and slower in gases. Example- Sound travels in air with the speed of 330 m/s, In steel it travels with a speed of 5920 m/s, In liquids it travels with a speed of 5000 m/s.

Hope this helps you

The best responses to the statements are:

a. the current decreased.

b. The Same.

c. 2.5.

d. 0.25.

In an electrical circuit, resistance is a measure of the resistance to current flow.

The Greek letter omega is used to represent resistance in ohms.

The resistance is inversely proportional to the current.

Thus, the correct options are a. the current decreased.

b. The Same.

c. 2.5.

d. 0.25.

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Answer:

Ye ye answer be below:

Explanation:

~Hope this helps! :)

Answer:

"Emerging technologies, such as industrial robots, artificial intelligence, and machine learning, are advancing at a rapid pace. These developments can improve the speed, quality, and cost of goods and services, but they also displace large numbers of workers."

Explanation:

This means in the furture we will have many technologies doing our day to day life things.

Answer:

Explanation:

Field characteristics

The strength of the field at the Earth's surface ranges from less than 30 microteslas (0.3 gauss) in an area including most of South America and South Africa to over 60 microteslas (0.6 gauss) around the magnetic poles in northern Canada and south of Australia, and in part of Siberia.

Answer:

Voltage SPIKES

Explanation:

Answer: False

Explanation:

Answer:

moon planet star galaxy universe

Answer:

iron

Explanation:

Answer:

350 j

Explanation:

K.E. = 1/2 m v^2

      = 1/2  7 * 10 ^2 = 350 j

Answer:

3 amps

Explanation:

V = IR

6 = I * 2

I = 3 amps

Answer:

29.55 kg

Explanation:

force gravity =  G m1 m2 / (r^2)    now change the mass 1 and the r

                     =   G 2m1 m2 / ( 2r)^2

                      = 2/4  G m1 m2 / (r^2)

the weight will be 2/4   or  1/2 the original

Answer:

A wire carrying a 30.0-A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.16-N force on the 4.00 cm of wire in the field. What is the average field strength?

Explanation:

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If a supernova remnant core has a mass greater than 2.8 solar masses, then NO force will be able to stop gravity from collapsing the core. (Option C)

A supernova Remnant Core is an astronomic structure that is remaining after the explosion of a star in a supernova has occurred.

A supernova is simply the explosion of a star. When the mass of the sun is used as a unit of mass, it is called solar mass. This unit is given as:

1.989 × 1030 kg.

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Answer:

1/2 watt hr    

Explanation:

watts = V I   =   6 * 5 = 30 watts   for 1/60 hr

30 watts * 1/60 hr = 1/2  watt hr

Earth has a definite orbit within the solar system whose the orbit is mainly a result of the mass of the Sun.

An orbit is defined as the regular, repeating path that one object in space takes around another while an object in an orbit is called a satellite which may be natural, such as the Earth or the Moon. According to the height of satellites from the earth, these orbit are classified as

Most of the weather and some communications satellites will tend to have a high Earth orbit which is farthest away from the surface. The main difference between orbit and orbitals is that the former is defined as a fixed path of electron revolutions, whereas the latter is defined as an uncertain region with a high probability of finding an electron.

Therefore, the Earth has a definite orbit within the solar system whose the orbit is mainly a result of the mass of the Sun.

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The fact that large elliptical galaxies are more common in central galaxy clusters suggests that collisions play a role in the formation of these galaxies.

Galaxy formation is a physical phenomenon where molecular clouds of dust concentrate and thus first generate stars.

Galaxy formation is a process that can be associated with collisions, at least for the formation of elliptical galaxies.

Collisions are a relatively frequent process in clusters (groups) of galaxies that are formed by crashes with other galaxies.

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For a typical house requires 235 W of electric power on average,  deuterium fuel used is mathematically given as

E=79206.75

Generally, the mass and time statement  of deuterium is mathematically given as

Mass deuterium=2.014g

time =3.15*107s= 1year

In conclusion, energy

E=235*3.15*107s

E=79206.75

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Answer:

C

Explanation:

because acceleration is the rate of change of velocity.

Answer:

C

Explanation:

bcuz i said its c cuzzo

3.75 N of force will be applied to a charge. Because of the electric field, a force operated on the charge.

The electric force between two charges is proportional to their product and inversely proportional to the square of their distance.

In this question, the provided data is:

F is the applied force,

q denotes the charge, which is equal to 2.5 C.

v is the velocity = 5.0 10³ m/s

B is the magnetic field = 3.0 10² T

The following is the force on a moving charge:

[tex]\rm F = q V B sin \alpha \\\\ F = 2.5 \times 10^{-6} \times 3 \times 10^{-2} \times 5 \times 10^3 \\\\ F=3.75 \ N[/tex]

As a result, 3.75 N will be exerted on a charge.

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Answer:

3.8 N

Explanation:

got it right on edge

The Sun is a main-sequence star which is also known as G2V.

It can also known as yellow dwarf because of its yellow colour. It was formed about 4.6 billion years ago from the gravitational collapse of matter of a large molecular cloud.

So we can conclude that the Sun is a main-sequence star which is also known as G2V.

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