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Lapatulllka [165]
3 years ago
5

4

Physics
1 answer:
ollegr [7]3 years ago
7 0

Answer:

50 m/s

Explanation:

The motion of the roller coaster car parameters are;

The initial speed of the roller coaster, v = 2 m/s

The distance to reach the bottom, Δd = 200 meter

The time it takes to reach the bottom, Δt = 4 seconds

The speed at the bottom of the tracks = 22 m/s

The average speed, v_{ave} = Δd/Δt

∴ v_{ave} = (200 m)/(4 s) = 50 m/s

The average speed of the roller coaster ride over the 200 m drop, v_{ave} = 50 m/s

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Which surface has more friction <br>A. an ice rink<br>B. a grassy field <br>C. a paved road​
antoniya [11.8K]

Answer:

<h2>The answer is </h2><h2>C. a paved road</h2>

Explanation:

Generally, roads are meant to have very rough surfaces to allow for friction between car tyres hence the motion of vehicles.

What is a paved surface?

Paved roads are roads that are covered with a firm surface suitable for travel, like paving stones or concrete or asphalts.

Another good example of a paved road is a  small paved courtyard, covered with a hard layer of concrete/cement.

The other two examples sited in this problem are glossy materials with very low surface friction, that is their surfaces are very smooth.

4 0
3 years ago
What do we call the distance between any two successive crests of a wave
icang [17]

That is actually called the Wave Length.

8 0
3 years ago
A spaceship moving with an initial velocity of 58.0 meters/second experiences a uniform acceleration and attains a final velocit
Naddika [18.5K]
The ship's average speed during the 12 seconds is

                         (1/2) (58 + 153)

                     =  (1/2) (211 m/s)

                     =        105.5 m/s .

Traveling for 12 seconds at an average speed of  105.5 m/s ,
the ship covers

               (12 sec) x (105.5 m/s)

           =        1,266 meters  during the acceleration
8 0
4 years ago
You sit "at rest" in front of your computer to answer this question. But you sit on the surface of a planet that spins, so even
igomit [66]

Answer: Linear speed is 1,670 Kph.

Explanation:

If we assume that the earth is a perfect sphere, and that is spinning itself once every roughly 24 hr, we can get the angular velocity of the Earth, in magnitude, as follows:

ω = 2π / 24 Hr

Now, by definition, an angle is the relationship between the arc s, and the radius r, so we can replace these values in the angular velocity expression, as follows:

ω = (Δs / r) . 1/Δt ⇒ ω = (Δs/Δt). 1/r

But, by definition, Δs/At, is just the linear velocity, v, so we can conclude the following;

ω = v/r ⇒ v = ω. r

So, we can get v, as follows:

v = 2π /24 hr . 6378 Km = 1,670 Km/hr.

4 0
3 years ago
While traveling along a highway a driver slows from 24 m/s to 15 m/s in 12 seconds. What is the automobile's acceleration? (Reme
slava [35]

Answer:

Acceleration = -0.75 m/s²

Explanation:

Given the following data;

Initial velocity = 24 m/s

Final velocity = 15 m/s

Time = 12 seconds

To find the acceleration of the automobile;

Acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

Acceleration (a) = \frac {final \; velocity  -  initial \; velocity}{time}

Substituting into the formula, we have;

Acceleration = \frac{15 - 24}{12}

Acceleration = \frac{-9}{12}

Acceleration = -0.75 m/s²

Therefore, the automobile is decelerating because its final velocity is lesser than its initial velocity, leading to a negative value.

5 0
3 years ago
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