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
Hitman42 [59]
3 years ago
8

.Una moto circula a 72km/h. Frena hasta detenerse y tarda 10 segundos en dicha operación.

Physics
1 answer:
adell [148]3 years ago
5 0

Answer:

I. Aceleración, a = -2 m/s²

II. Distancia, S = 100 metros

Explanation:

<u>Dados los siguientes datos;</u>

Velocidad inicial = 72 km / h

Tiempo = 10 segundos

Velocidad final = 0 m/s

<u><em>Conversión:</em></u>

72 km/h a metros por segundo = 72 * 1000/3600 = 72000/3600 = 20 m/s

I. Para encontrar la aceleración, usaríamos la primera ecuación de movimiento;

V = U + at

Dónde;

  • V es la velocidad final.
  • U es la velocidad inicial.
  • a es la aceleración.
  • t es el tiempo medido en segundos.

Sustituyendo en la fórmula, tenemos;

0 = 20 + a*10

-20 = 10a

Aceleracion = \frac{-20}{10}

<em>Aceleración, a = -2 m/s²</em>

<em>Nota: el signo negativo indica desaceleración o retraso.</em>

II. To find the acceleration, we would use the third equation of motion;

V^{2} = U^{2} + 2aS

Dónde;

  • V es la velocidad final.
  • U es la velocidad inicial.
  • a es la aceleración.
  • S es la distancia.

Sustituyendo en la fórmula, tenemos;

0^{2} = 20^{2} + 2*(-2)*S

0 = 400 - 4S

4S = 400

S = \frac {400}{4}

<em>Distancia, S = 100 metros</em>

You might be interested in
Need help with physics! Please provide explanation.
GrogVix [38]
Electromagnetic Waves: This type of wave requires no medium (substance) to travel through.
4 0
3 years ago
A runner with a mass of 80kg accelerates from 0 to 9 m/s in 3 s find the net force
frosja888 [35]
So, first you find your acceleration which is 3m/s^2, using the acceleration formula.
Now set up your equation, F=ma, so put in the stuff, F=80kg·3m/s^2. Then solve your equation by multiplying, and you get F=240N, since newtons are your measurement.
Hope this helps
4 0
4 years ago
What acceleration occurs if the friction force in #4 is now 4N?
anastassius [24]

Answer:

you a b1tc h

Explanation:

you're not going anywhere in life. mcdonalds hiring $16 an hour where i live.

4 0
2 years ago
Read 2 more answers
I need help on this science
Serga [27]
Ok ok ok ok ok ok ok ok ok
8 0
3 years ago
A wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.15 m2 and whose thickn
KengaRu [80]

Answer:

88 %

Explanation:

The rate of heat loss by a conducting material of thermal conductivity K, cross-sectional area,A and thickness d with a temperature gradient ΔT is given by

P = KAΔT/d

The total heat lost by the styrofoam wall is P₁ = K₁A₁ΔT₁/d₁ where K₁ =thermal conductivity of styrofoam wall 0.033 W/m-K, A₁ = area of styrofoam wall = 17 m², ΔT₁ = temperature gradient between inside and outside of the wall and d₁ = thickness of styrofoam wall = 0.20 m

The total heat lost by the glass window is P₂ = K₂A₂ΔT₂/d₂ where K₂ =thermal conductivity of glass window pane wall 0.96 W/m-K, A₂ = area of glass window pane = 0.15 m², ΔT₂ = temperature gradient between inside and outside of the window and d₂ = thickness of glass window pane = 7 mm = 0.007 m

The total heat lost is P = P₁ + P₂ = K₁A₁ΔT₁/d₁ + K₂A₂ΔT₂/d₂

Now, since the temperatures of both inside and outside of both window and wall are the same, ΔT₁ = ΔT₂ = ΔT

So, P = K₁A₁ΔT/d₁ + K₂A₂ΔT/d₂

Since P₂ = K₂A₂ΔT₂/d₂ = K₂A₂ΔT/d₂is the heat lost by the window, the fraction of the heat lost by the window from the total heat lost is

P₂/P = K₂A₂ΔT/d₂ ÷ (K₁A₁ΔT/d₁ + K₂A₂ΔT/d₂)

= 1/(K₁A₁ΔT/d₁÷K₂A₂ΔT/d₂ + 1)

= 1/(K₁A₁d₂÷K₂A₂d₁ + 1)

= 1/[(0.033 W/m-K × 17 m² × 0.007 m ÷ 0.96 W/m-K × 0.15 m² × 0.20 m) + 1]

= 1/(0.003927/0.0288 + 1)

= 1/(0.1364 + 1)

= 1/1.1364

= 0.88.

The percentage is thus P₂/P × 100 % = 0.88 × 100 % = 88 %

The percentage of heat lost by window of the total heat is 88 %

6 0
3 years ago
Other questions:
  • A force of 20N acts upon of 5 kg. Calculate the acceleration of the object.
    6·1 answer
  • Which is best supported by the data in the chart? Current W flows at a higher rate than Current Z. Current Y flows at a lower ra
    9·2 answers
  • The word back is up there!!!
    10·1 answer
  • A constant 10.0-N horizontal force is applied to a 20.0-kg cart at rest on a level floor. If friction is negligible, what is the
    9·1 answer
  • Which type of earthquake waves travel out in all directions from the focus, the point in the crust where the earthquake occurred
    7·1 answer
  • When observed from Earth, the wavelengths of light emitted by a star are shifted toward the red end of the
    7·1 answer
  • Density of water is 1000kg/meter cube. what will be the volume of 35000kg water ​
    6·1 answer
  • Explain What the core muscles do and why it's important to have a strong set of core muscles.​
    14·2 answers
  • - A ball is thrown at a wall 50 meters away. It takes the ball 5 seconds to get to
    5·1 answer
  • What is the force needed to accelerate a grocery sack weighing 212 N upward at 1.7 m/s2
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!