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
slava [35]
3 years ago
10

A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s. At this time, the driver suddenly realizes that she m

ust stop the car. If it takes 0.200 s for the driver to apply the brakes, what must be the magnitude of the constant acceleration of the car after the brakes are applied so that the car will come to rest at the stop sign? A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s. At this time, the driver suddenly realizes that she must stop the car. If it takes 0.200 s for the driver to apply the brakes, what must be the magnitude of the constant acceleration of the car after the brakes are applied so that the car will come to rest at the stop sign? 3.89 m/s2 4.17 m/s2 2.89 m/s2 3.42 m/s2 2.08 m/s2
Physics
1 answer:
Zinaida [17]3 years ago
6 0

Answer:

4.17 m/s²

Explanation:

We are told the reaction time is 0.2 s. Now, during this reaction time the car is going to travel an additional distance of : x = u × t = 40 × 0.2 = 8 m

where u is the initial velocity of the car which is 40.0 m/s.

We are told that he had 200 m to stop before applying brakes. Thus, after applying brakes, he now has a distance to cover of; s = 200 - 8 = 192 m

Since vehicle is coming to rest acceleration would be negative, thus using Newton's equation of motion, we have;

v ² = u² - 2as

v = 0 m/s since it's coming to rest

u = 40 m/s

s = 192 m

Thus;

0² = 40² - 2(a)(192)

0² = 1600 - 384a

a = 1600/384

a = 4.17 m/s²

You might be interested in
PLEASE HELP!! ILL MARK BRAINLYEST!!
topjm [15]

Answer: True

Explanation:

Mass is the amount of matter in an object. Everything is made up of matter.

3 0
3 years ago
Read 2 more answers
Answer ?
morpeh [17]

Answer:

2.75 m/s^2

Explanation:

The airplane's acceleration on the runway was 2.75 m/s^2

We can find the acceleration by using the equation: a = (v-u)/t

where a is acceleration, v is final velocity, u is initial velocity, and t is time.

In this case, v is 71 m/s, u is 0 m/s, and t is 26.1 s Therefore: a = (71-0)/26.1

a = 2.75 m/s^2

5 0
2 years ago
Please help.. I'm desperate.
rosijanka [135]

Answer:

Newton's Second Law tells us that the more mass an object has, the more force is needed to move it. A larger rocket will need stronger forces (eg. more fuel) to make it accelerate. The space shuttles required seven pounds of fuel for every pound of payload they carry.

Explanation:

7 0
3 years ago
A metal rod of length (L) moves with velocity (v), perpendicular to its length, in a magnetic field B, which is perpendicular to
Alborosie

Explanation:

If a metal rod of length L moves with velocity v is moving perpendicular to its length, in a magnetic field B, the induced emf is given by :

\epsilon=Blv

The electric field in the conductor is given by :

E=\dfrac{\epsilon}{l}\\\\E=\dfrac{Blv}{l}\\\\E=Bv

It is clear that the electric field is independent of the length of the rod. If the length of the rod is doubled, the electric field in the rod remains the same.

6 0
3 years ago
Calculate the accleration of a 25-Kg object that moved with force of 300 N
inysia [295]
F=ma
a=F/m=300/25=12 m/s^2
4 0
3 years ago
Other questions:
  • In the formula used to solve problems related to the first law of thermodynamics, what does Q represent? A.internal energy
    11·2 answers
  • How is temperature related to the physical change of a substance
    9·2 answers
  • Define the phenomena​
    6·2 answers
  • Some of the largest volcanoes in the solar system are on mars. The most likely explanation is that mars
    15·1 answer
  • Which ones of the following lights are present in both sunlight and a grow
    13·1 answer
  • Though atomic physicists have made significant progress at understanding how God created the atom, a there is not yet a complete
    10·1 answer
  • What does the blackboard do when white light falls on it?​
    14·1 answer
  • calculate the work done by 2N force directed at 30 degree to the vertical to move a 500g box a horizontal distance of 400 cm acr
    13·1 answer
  • What are the physical and chemical properties of sodium?
    5·1 answer
  • The following equation, N2 + 3 H2 —>2 NH3 ,describes a
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!