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
mario62 [17]
3 years ago
10

A self-driving car traveling along a straight section of road starts from rest, accelerating at 2.00 m/s2 until it reaches a spe

ed of 32.0 m/s. Then the vehicle travels for 53.0 s at constant speed until the brakes are applied, stopping the vehicle in a uniform manner in an additional 5.00 s. (a) How long is the self-driving car in motion (in s)? s (b) What is the average velocity of the self-driving car for the motion described? (Enter the magnitude in m/s.) m/s
Physics
2 answers:
valentinak56 [21]3 years ago
6 0

Answer:

t = 75.4 s

v = 26.9 m/s

Explanation:

Part1 :

v1 = 0 m/s

v2 = 32 m/s

a = 2 m/s2

The time needed to reach the final speed is:

v2 = v1 + a*t

32 = 0 + 2*t

t = 16 s

Part 2:

constant speed of 32 m/s for 53 s

Part 3:

v2 = 32 m/s

v3 = 0 m/s

t = 5 s

The acceleration is negative because the car is stopping:

v3 = v2 + a*t

0 = 32 + a*5

a = - 6.4 m/s

a) The total time the car is in motion is:

total time = 16 + 53 + 6.4 = 75.4 s

b) For the average speed you can calculate the total distance and divide it by the total time for an easier way

Part 1

d = (32+0)/2 * 16 = 256 m

Part 2

d = 32 * 53 = 1696 m

Part 3

d = (32+0)/2 * 5 = 80 m

Average speed:

v = (256 + 1696 + 80)/75.4 = 26.9 m/s

slamgirl [31]3 years ago
4 0
V=26.9 m/s
T=75.4s good luck
You might be interested in
Through what vertical height is a 50 N object moved if 250 J of work is done lifting it against the gravitational field of Earth
zimovet [89]

5m

Explanation:

Given parameters:

Weight of object = 50N

Work done in lifting object = 250J

Unknown:

Vertical height = ?

Solution:

The work done on an object is the force applied to lift a body in a specific direction.

   Work done = force x distance

  Weight is a force in the presence of gravity;

  Work done = weight x height of lifting

Height of lifting = \frac{work done }{weight}

 Height of lifting = \frac{250}{50} = 5m

The vertical height through which the object was lifted is 5m

learn more:

Work done brainly.com/question/9100769

#learnwithBrainly

6 0
3 years ago
A 40-kg uniform semicircular sign 1.6 m in diameter is supported by two wires as shown. What
garri49 [273]

Answer:

T1 = 131.4 [N]

T2 = 261 [N]

Explanation:

To solve this problem we must make a sketch of how will be the semicircle, for this reason we conducted an internet search, to find the scheme of the problem. This scheme is attached in the first image.

Then we make a free body diagram, with this free body diagram, we raise the forces that act on the body. Since it is a problem involving static equilibrium, the sum of forces in any direction and moments must be equal to zero.

By performing a sum of forces on the Y axis equal to zero we can find an equation that relates the forces of tension T1 & T2.

The second equation can be determined by summing moments equal to zero, around the point of application of the T1 force. In this way we find the T2 force.

The value of T2, is replaced in the first equation and we can find the value for T1.

Therefore

T1 = 131.4 [N]

T2 = 261 [N]

The free body diagram and the developed equations can be seen in the second attached image.

4 0
3 years ago
An electric motor converts electrical energy into______<br>energy​
faltersainse [42]
Mechanical energy is the answer
7 0
2 years ago
The mass of a string is 5.9 × 10-3 kg, and it is stretched so that the tension in it is 200 n. a transverse wave traveling on th
bagirrra123 [75]

The velocity of the wave on the string is given by

v=\sqrt{\frac{T}{\frac{m}{L}}}  \\  v=\sqrt{\frac{TL}{m}}

Solving the above equation,

v^2=\frac{TL}{m} \\  L=\frac{v^2m}{T}

The frequency of the wave f=300 and wave length is 0.76

The velocity is v=(300)(0.76)=228

Substituting numerical values,

L=\frac{228^2(0.0059)}{200}\\ T=1.534

The length of the string is 1.534 m

4 0
3 years ago
What is the radius of a tightly wound solenoid of circular cross-section that has 180turns if a change in its internal magnetic
Nata [24]

Answer:

Radius of cross section, r = 0.24 m

Explanation:

It is given that,

Number of turns, N = 180

Change in magnetic field, \dfrac{dB}{dt}=3\ T/s

Current, I = 6 A

Resistance of the solenoid, R = 17 ohms

We need to find the radius of the solenoid (r). We know that emf is given by :

E=N\dfrac{d\phi}{dt}

E=N\dfrac{d(BA)}{dt}

Since, E = IR

IR=NA\dfrac{dB}{dt}

A=\dfrac{IR}{N.\dfrac{dB}{dt}}

A=\dfrac{6\ A\times 17\ \Omega}{180\times 3\ T/s}

A=0.188\ m^2

or

A=0.19\ m^2

Area of circular cross section is, A=\pi r^2

r=\sqrt{\dfrac{A}{\pi}}

r=\sqrt{\dfrac{0.19}{\pi}}

r = 0.24 m

So, the  radius of a tightly wound solenoid of circular cross-section is 0.24 meters. Hence, this is the required solution.

5 0
3 years ago
Other questions:
  • Distance and amount of charge are factors that determine which of the following quantities?
    5·1 answer
  • To what extent do drugs benefit society (legal and illegal drugs - can include medication)
    8·1 answer
  • Genetic mutations occur in populations over time . These mutations are
    10·1 answer
  • It is necessary to determine the specific heat of an unknown object. The mass of the object is 201.0 g. It is determined experim
    8·2 answers
  • What is the potential energy of a 3 kg rock sitting at the top of a 21 meter high cliff?
    8·1 answer
  • An object’s average density rho is defined as the ratio of its mass to its volume: rho=M/V. The earth’s mass is 5.94×1024kg, and
    15·1 answer
  • Hailey is preparing a debate on the benefits of using synthetic polymers over natural polymers, and she wants to create a list t
    15·2 answers
  • Panuto: nibabahagi ang sariling ideya tungkol sa kahalagan ng akdang tinalakay.Umiisip ng mga pangyayari sa kasalukuyan (sa naba
    6·1 answer
  • at maximum extension a bungee cord stores 2.0 X 10^6 J of energy. A 10 kg mass extends the bungee cord 1.3m. what is the maximum
    9·1 answer
  • 4. A desk with a mass of 10 kg is pushed across a floor with an acceleration of 4 m/s?. What
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!