1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
True [87]
2 years ago
11

A roller coaster car rapidly picks up speed as it rolls down a slope as it starts down the slope its speed is 4m/s but 3 seconds

later at the bottom of the slope its speed is 22m/s what is its average acceleration
Physics
1 answer:
Gwar [14]2 years ago
3 0

Answer:

The acceleration is 6 [m/s^2]

Explanation:

We can find the acceleration of the roller coaster using the kinematic equation for uniformly accelerated motion.

v_{f} =v_{i} + a*t\\where:\\v_{f} = final velocity = 22 [m/s]\\v_{i} = initial velocity = 4 [m/s]\\t = time = 3 [s]\\

Now replacing the values we have:

a=\frac{v_{f} - v_{i} }{t} \\a=\frac{22 - 4 }{3}\\a = 6 [m/s^{2} ]

You might be interested in
Find the average speed of a horse that traveled east for 25km in 4 hours.
MArishka [77]

The direction the horse travels has nothing to do with its speed but...

The horse would be traveling 6.25 km/hr

You simply take the overall travel (25km) and divide it by the total time (4hr)

You get 6.25km  as your answer, meaning that every hour the horse traveled 6.25km every hour.

4 hours later the horse has reached 25km

4 0
3 years ago
A car can be braked to a stop from the autobahn-like speed of 206 km/h in 190 m. Assuming the acceleration is constant, find its
Llana [10]

Answer:

  • a = - 8.617 \frac{m}{s^2}
  • a =  - 0.8798 \ g
  • Tb = 6.64 \ s
  • \frac{Tb}{Tr} = 16.6

Explanation:

<h3>a and b</h3>

We can use the following formula, from kinematics:

(v_f)^2-(v_i)^2 = 2  \ a \  d

where v_f is the final speed, v_i is the initial speed, a is the acceleration and d the distance traveled.

Knowing that the final speed is zero, and the initial speed is

v_i = 206 \frac{km}{h} = 206 \frac{km}{h} \frac{1000 \ m}{1 \ km} \frac{1 \ h}{3600 \ s} = 57.22 \frac{m}{s}

we obtain

(0)^2-(57.22 \frac{m}{s})^2 = 2  \ a \  190 \ m

a = \frac{ - \ 3,274.13 \frac{m^2}{s^2} }{ 2 \ 190 \ m}

a = - 8.617 \frac{m}{s^2}

Now, knowing that

g = 9.806 \frac{m}{s^2}

then

a = \frac{- 8.617 \frac{m}{s^2}} { 9.806 \frac{m}{s^2} } \ g

a = -  0.8798 \ g

<h3>c</h3>

We can use the following formula

v(t) = v_0 + a t

so

0 =  57.22 \frac{m}{s} - 8.617 \frac{m}{s^2} \ Tb

Tb = \frac{ 57.22 \frac{m}{s} }{ 8.617 \frac{m}{s^2} }

Tb = 6.64 \ s

<h3>d</h3>

\frac{Tb}{Tr} = \frac{ 6.64 \ s }{ 0.4 s }

\frac{Tb}{Tr} = 16.6

3 0
2 years ago
Determine the frequency of light whose wavelength is 4.257 x 10-7 cm
marin [14]

v =  f (wavelength)i don't know what symbol ya'll use for wavelength so i just put the word instead.We use the greek symbol lambda.So just plug in everything you know.
wavelength=4.257×10^-7x10^-2 and
v=speed of light = 3×10^8
So you should get f= 7.04 ×10^15Hz
7 0
3 years ago
the loudness of a person's voice depends on the A. force with which air rushes across the vocal folds B. strength of the intrins
blsea [12.9K]

Answer: A. force with which air rushes across the vocal folds

Explanation:

The human voice is produced in the larynx, whose essential part is the glottis. This is how the air coming from the lungs is forced during expiration through the glottis, making its two pairs of vocal folds to vibrate.

It should be noted that this process can be consciously controlled by the person who speaks (or sings), since the variation in the intensity of the sound of the voice depends on the strength of the breath.

5 0
3 years ago
What is 62.125 kg rounded to two significant figures?
Mamont248 [21]

<em> </em><em> </em><em>62.125</em>

<em>=</em><em> </em><em>62.12</em>

<em>THANK</em><em> </em><em>you</em><em> </em>

6 0
3 years ago
Other questions:
  • Blood takes about 1.65 s to pass through a 2.00 mm long capillary. If the diameter of the capillary is 5.00 μm and the pressure
    5·1 answer
  • A cannonball is fired across a flat field at an angle of 43 degrees with an initial speed 32 m/s and height of 12 m.
    6·1 answer
  • Learning Goal: To introduce the idea of physical dimensions and to learn how to find them.Physical quantities are generally not
    8·1 answer
  • A boat crosses a river of width 229 m in which the current has a uniform speed of 0.756 m/s. The pilot maintains a bearing (i.e.
    7·1 answer
  • If a star contains a certain element, it can be determined by studying the star’s
    12·1 answer
  • Analysis of the electrocardiogram can be revealed except ________
    15·1 answer
  • At do we call the cells that are made as the end result<br> of meiosis?
    12·1 answer
  • A bullet is fired from a rifle with an initial velocity of 300 m/s at an angle of 25 degrees from the horizontal.
    8·1 answer
  • Helpppppppppp meeeeeeeeeee plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
    8·1 answer
  • A plane that is 2000m in the air of the potential energy of the plane is 86000 J what is the mass of the plane
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!