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
never [62]
3 years ago
7

You are driving a car at the 25-mi/h speed limit when you observe the light at the intersection 65 m in front of you turn yellow

. You know that at that particular intersection the light remains yellow for exactly 6.0s before turning red. After you think for 1.0 s, you then accelerate the car at a constant rate. You somehow manage to pass your 4.1 m car completely through the 15.0 m wide intersection just as the light turns red, thus narrowly avoiding a ticket for running a red light. Immediately after passing through the intersection you take your foot off the accelerator, relieved. However, down the road you are pulled over for speeding. You assume you were ticketed for the speed of your car as it exited the intersection. Determine this speed and decide whether you should fight this ticket in court.
Physics
1 answer:
ahrayia [7]3 years ago
4 0

Answer:

v_f = 50 mph

since the speed is exceeded the speed limit so it should not cross the junction

Explanation:

Initial speed of the car is given as

v_i = 25 mph

now we will have

v_i = 11.2 m/s

now the distance that car should move to cross the intersection is given as

d = 65 + 15 + 4.1

d = 84.1 m

Now time to cross the junction is

t = 6 - 1 = 5 s

now the acceleration of the car must be

d = v_i t + \frac{1}{2}at^2

84.1 = 11.2(5) + \frac{1}{2}a(5^2)

a = 2.25 m/s^2

Now the final speed of the car is given as

v_f = v_i + at

v_f = 11.2 + (2.25\times 5)

v_f = 22.4 m/s

v_f = 50 mph

since the speed is exceeded the speed limit so it should not cross the junction

You might be interested in
Than a cool
Rashid [163]
Alnilam is the brightest star

Absolute brightness is how bright the star actually is. Apparent brightness is how bright the star looks.

Factors that influence how bright a star looks is distance. The fact that Alnilam has the same apparent brightness of the other two stars even though it is farther away, means that it is brighter.

7 0
3 years ago
By what factor will the Electrostatic Force between two charged objects change when the amount of charge on both objects doubles
Mademuasel [1]

Answer:

F' = (4/9)F

Explanation:

The electrostatic force between two charged objects is given by Coulomb's Law:

F = kq₁q₂/r²   -------------------- equation (1)

where,

F = Electrostatic Force

k = Coulomb's Constant

q₁ = magnitude of first charge

q₂ = magnitude of second charge

r = distance between charges

Now, when the charges and distance altered as follows:

q₁' = 2q₁

q₂' = 2q₂

r' = 3r

Then,

F' = kq₁'q₂'/r'²

F' = k(2q₁)(2q₂)/(3r)²

F' = (4/9)kq₁q₂/r²

using equation (1):

<u>F' = (4/9)F</u>

7 0
2 years ago
A substance with a pH of 9 has
Lady bird [3.3K]

A) no H30+ ions or OH- ions.
3 0
3 years ago
PLEASE HELP IT'S DUE IN LIKE 2 MINUTES
antoniya [11.8K]

Answer:

1kg

Explanation:

this box is the smallest and weighs the least. Hope this helps :]

4 0
2 years ago
_____ is the transfer of thermal energy between two bodies which are at different temperatures. The si unit for this is the joul
ss7ja [257]

Answer:

Heat

Explanation:

The thermal energy is usually defined as a heat energy that occurs due to the increase in temperature. Due to this increasing temperature, the atoms, as well as the molecules, start to migrate at a much faster rate and rapid collisions occur with one another.

This temperature change that is involved in this process can be measured.

Thus, in thermal energy, heat (heat energy) is transferred from one body to another at different distinct temperatures.

The SI unit of heat is Joule.

6 0
3 years ago
Other questions:
  • Consider three starships that pass by an observer on Earth. Starship A is traveling at speed v=c/3v=c/3 relative to Earth and ha
    13·1 answer
  • The number ocean waves that pass a buoy in one second is _ of the wave
    11·2 answers
  • PLEASE ANSWER!!!!!
    13·1 answer
  • so I know you can solve this either by using Vox or Voy. I'm getting 3.08s when using Vox and 3.14s for Voy way. For Voy I'm usi
    8·1 answer
  • Near the surface of Earth, acceleration due to gravity is 9.8 m/s2. Remember the formula: velocity = acceleration x time. Imagin
    6·2 answers
  • 1. A car with a mass of 1,500 kilograms is moving around a circular curve at a uniform velocity of 16 m/s. The curve has a radiu
    7·2 answers
  • Which diagram shows a light ray moving from a more dense into a less dense medium?​
    6·1 answer
  • I NEED HELP :) ty.............
    8·1 answer
  • What is the acceleration of a racing car if it's speed is increased uniformly from 44 m /s to 66 m / s over an 11 second period
    6·1 answer
  • What is nature's heat tax, and how does it relate to energy use? drag the terms on the left to the appropriate blanks on the rig
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!