A frictionless roller coaster (22kg) is at a height h traveling with a speed v0 = 10m / s. Assume that h = 20m. The speed of the car at point B is:

Answer: B & D

Explanation:

The objects are moving in opposite directions is the statements accurately describe the motion map, therefore the correct answer is option B

An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard. Displacement describes this shift in location.

It is a vector quantity to be displaced. This means that it is visually represented as an arrow that points from the starting position to the ending position and that it has both a direction and a magnitude.

The total distance traveled by an object is different than the total displacement covered by it because the displacement is a vector quantity and it is calculated on the basis of the shortest distance traveled by the body or object.

Thus, The objects are moving in opposite directions is the statements accurately describe the motion map, therefore the correct answer is option B

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Answer:

0.0045 s

Explanation:

Period = 1 / frequency

T = 1 / (220 Hz)

T = 0.0045 s

Answer:

A

Explanation:

It varies from person to person.

Answer:

A.

It varies from person to person.

Explanation:

i just look the test

Frequency is the amount of times the particle moves back and forth per second, more or less. The more energy, the higher the frequency. At the same time, the more energy means you'll have a shorter wavelength (aka period). Color only applies to the visible spectrum.

Answer:

frequency

Explanation: The greater the number of waves appear the greater the energy. The smaller the number of waves appear the lower the energy.

Frequency is the number of times waves appear.

Answer:

Explanation:

Special problems: Rural areas can be twice as dangerous as their city counterparts. ... Two common effects of driving on open highways are velocitation and ... Avoid speeding on rural roads or after you exit the freeway by checking your ... for a long period of time, be aware of a condition known as "highway hypnosis".

Driving on wide highways frequently results in velocitation and tiredness. The phenomena of accidentally raising speed on roads as a result of repeated exposure to greater speeds is known as velocitation.

It happens when drivers become acclimated to the faster speeds and may unintentionally go over the speed limit, endangering their safety.

Another frequent impact is fatigue, which can occur as a result of extended lengths of repetitive driving on wide-open highways. Fatigue can make it difficult to focus, respond quickly, and make decisions, which makes accidents more likely.

Despite the fact that highway hypnosis and visual effects can also happen when driving, open roads are uniquely linked to velocitation and weariness.

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Explanation:

Average of acceleration

Answer: D:

A periodic disturbance of a medium

Explanation:

A wave can be Mathematically defined by periodic disturbance of a medium. That is, oscillations of the waves about a fixed position or change in position from the resting equilibrium position. The wave oscillate from equilibrium position with amplitude periodically.

Answer:

energy moves freely

just guessing

Answer:

C: Energy does NOT move freely

Explanation:

a closed system does not allow energy to flow, open systems do.

Answer:

They would repel because they are opposites

Explanation:

The two point charges will repel each other with a force of 9×10⁹N because they both have the same nature of the charge.

Given two point charges with a charge of +1.00 C. Separated by a distance of 1 m.

So, q₁ = q₂ = 1C and distance r = 1m

Since the charges are alike, that is both of them are positive charges, they will repel each other with an electrostatic force given by:

F = kq₁q₂/r²

where k is Coulomb's constant.

F = 9×10⁹×1²/1²

F = 9×10⁹N

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Answer:

Mass of object (m) = 5.102 kg

Explanation:

Given:

Horizontal Force (F) = 50 N

Find:

Mass of object (m) = ?

Computation:

We know that, acceleration due to gravity (g) = 9.8 m/s²

⇒ Horizontal Force (F) = mg

⇒ 50 N = m (9.8 m/s²)

⇒ Mass of object (m) =  50 / 9.8

⇒ Mass of object (m) = 5.102 kg

Mass of object (m) is 5.1 kg (Approx)

Answer:

transmit energy

Explanation:

hope this helps u stay safe

Answer:

Radio active waves

Explanation:

It transmits it by invisible waves to connect to internet or to use wireless headphones or wireless charger.

Answer:

50w

Explanation:

Power is equal to Energy divided by Time

∆E/t

Answer:

50 W

Explanation:

Power can be found using the following formula.

p=w/t

where w is work and t is time.

400 Joules of work is done on the object in 8 seconds. Therefore,

w= 400 J

t= 8 s

Substitute these values into the formula.

p=400 J/ 8 s

Divide 400 by 8

p=50 J/s

Add appropriate units. In this case, power uses Watts, or W. (1 Joule per second, or J/s is equal to 1 Watt, or W)

p= 50 W

The object experiences 50 Watts of power

Answer:

Horizontal distance travelled by the ball.

A. 367m

Explanation:

Projectile motion is a motion in which an object moves in a parabolic path due to the action of gravity on it. Projectile motion only occurs when there is one force which is applied at the beginning, after that the only interference is from gravity. e.g the path of a golf ball after hit by a golfer.

Range of the projectile can be defined as the horizontal distance given by the ball. We need to find Range in this question.

The Range of a projectile is given by:

[tex]R = \frac{v^2\cdot{sin2}\theta}{g}[/tex]

where

v = initial velocity = 25 m/s

θ = 35°

g = 1.6 m/s²

Substitute the values in formula of R:

[tex]R= \frac{(25)^2\cdot{sin(2\cdot35)}}{1.6}\\R= \frac{(625)\cdot{sin(70)}}{1.6}\\R=367m[/tex]

Answer: A yes

Explanation:

Answer:

A) Yes

Explanation:

Majority of what we perceive as "taste" is actually due to our sense of smell.

If we remove the contribution of smell by plugging your nose, many people have reported that apples, potatoes and onions indeed do "taste" the same.

Answer:

Gravity affects weight, it does not affect mass. MASSES ALWAYS REMAIN THE SAME. Newton's Second Law of Motion: Force = mass x acceleration The acceleration of an object is: a) directly proportional to the net force acting on the object

hope this helps u stay safe

Explanation:

Answer:

thrity-two degrees Celsius

Answer:

Explanation:

When you sit by a campfire, most of the heat you are receiving from the fire does not come from hot air. ... This radiation carries energy which is converted to heat when it hits another object and is absorbed. In contrast, conduction involves the direct movement of heat through an object.

Answer:

When you sit by a campfire, most of the heat you are receiving from the fire does not come from hot air. ... This radiation carries energy which is converted to heat when it hits another object and is absorbed. In contrast, conduction involves the direct movement of heat through an object.

Explanation:

hope this helps u stay safe

Answer: Average velocity = u+v/2

Explanation: The definition of velocity is displacement over time taken. That is,

Velocity = displacement/ time taken

But we have initial velocity U and final velocity V. When we are talking about average, we are talking about the mean value of the given parameters.

Therefore, average velocity will be addition of initial velocity and final velocity divided by 2. That is,

Average velocity = (U + V)/2

Answer:

A long handle

Explanation:

A spanner is basically a wrench, you would also want to use a long handled wrench in order to have more mechanical advantage and be able to apply more torque. This can be proven as well using a simple physics formula:

[tex]t = fd[/tex]

where the variables are:

t = torque

f = applied force

d = perpendicular distance from fulcrum to where the force is applied

It is clear that keeping the applied force constant, if you enlarge the perpendicular distance, d, you will be able to apply more torque and therefore have an easier time releasing this nut.

Explanation:

Formula = F = ma

Where f is force m is mass and a is acceleration

400 = 50a

400/50 = a

8

Option B is the correct answer

Answer:

the answer is B

Explanation: because, force=mass x acceleration, which acceleration=force : mass.

So, acceleration= 400 : 50=8m/s/s :D

Answer: Decreased risk of heart attack

Explanation:

thats the answer because it actually

increase rish of heart attack

Hope this helps :)

Answer:

the answer is C. It wont decrease your probability of a heart attack it will increase it

Explanation:

Answer:

Explanation:

When you sit by a campfire, most of the heat you are receiving from the fire does not come from hot air. ... This radiation carries energy which is converted to heat when it hits another object and is absorbed. In contrast, conduction involves the direct movement of heat through an object.

Answer:

the answer is a

Explanation:

due to it being high and kenetic is in motion

When the object falls to the ground so the option A should be considered for energy.

In the case when the object falls to the ground, so here the energy should be transformed from the gravitational potential energy to the kinetic energy as both are considered since the objects fallen into the ground.

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Answer:

Rolling Friction

Explanation:

But only write rolling on the blank space

Answer:I miss her

Explanation:

Because the moon has much less mass than the Earth has.  This makes the gravitational forces between the moon and any object much less than the forces between the Earth and the same object, when the object is the same distance from the center of the moon or the Earth.

To talk about an actual number, we usually talk about being on the surface of the Earth or the moon:

A person or object on the surface of the moon weighs about 17% as much as he/it weighs on the surface of Earth. That's about one-sixth as much.  So naturally, it's easier to lift something on the moon than it is to lift the same thing on Earth, because when it's on Earth, it's about six times as heavy.