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
Rasek [7]
3 years ago
12

A train has a length of 81.1 m and starts from rest with a constant acceleration at time t = 0 s. At this instant, a car just re

aches the end of the train. The car is moving with a constant velocity. At a time t = 11.6 s, the car just reaches the front of the train. Ultimately, however, the train pulls ahead of the car, and at time t = 36.3 s, the car is again at the rear of the train. Find the magnitudes of (a) the car's velocity and (b) the train's acceleration. g
Physics
1 answer:
arlik [135]3 years ago
4 0

Answer: a) vcar= 7 m/s ; b) a train= 0.65 m/s^2

Explanation: By using the kinematic equation for the car and the train we can determine the above values of the car velocity and the acceletarion of the train, respectively.

We have for the car

distance = v car* t, considering the length of train (81.1 m) travel by the car during the first 11.6 s

the v car =  distance/time= 81.1 m/11.6s= 7 m/s

In order to calculate the acceleration we have to use the kinematic equation for the train from the rest

distance train = (a* t^2)/2

distance train : distance travel by the car at constant speed

so distance train= (vcar*36.35)m=421 m

the a traiin= (2* 421 m)/(36s)^2=0.65 m/s^2

You might be interested in
I WILL GIVE BRAINLIEST
Sveta_85 [38]
A. Air, desk, water. sound travels the slowest through air and the fastest through liquids. solids are somewhere in the middle.
4 0
3 years ago
Describe and give an example of mutualism.
Nadusha1986 [10]

Answer:

Mutualism - Bee to flower. Bee eats - flower reproduces

Commensalism - Tree Frog to plant or tree. Frog uses plant for protection.

Parasitism - Flea or tick to host. Parasite feeds off host.

Explanation:

Competition - relationship between organisms that strive for same resources. intraspecific and interspecific. ex) two males competing for mates.

predation - one organism kills and consumes another. wolf hunting moose, cat hunting mouse. venus fly trap killing insect

3 0
3 years ago
7 km is equal to:<br><br> 0.7 m<br> 70 m<br> 700 m<br> 7,000 m
dusya [7]
The answer is 7000 meters.
7 0
3 years ago
Read 2 more answers
What can you say about the velocity about the velocity of moving body that is dynamic equalibrium? Draw a sketch of such a body
WITCHER [35]

Equilibrium implies that the net force on the body is 0, therefore the body undergoes no acceleration. No acceleration means the velocity doesn't change.

The body's velocity stays constant over time.

5 0
3 years ago
A sample of hydrated calcium sulfate has a mass of 20.88 g. After it is heated, it has a mass of 16.51 g. What is the percentage
STALIN [3.7K]
We know that when you heat up calcium sulfate all the water has evaporated from it. That means that the mass of water that was initially in the sulfate is the difference in mass of the sulfate before and after the heating.
m{_H__20}=20.88-16.51=4.37g
In order to <span>get a percentage by mass we simply divide this number by the initial amount of sulfate:
</span>\%_{H__2}O=\frac{4.37}{20.88}=20.93\%<span>
</span>
6 0
3 years ago
Read 2 more answers
Other questions:
  • A ball of mass 8 kg falls from rest from a height of 100 m. Neglecting air resistance,calculate its kinetic energy after falling
    6·2 answers
  • In __________ waves, the motion of the particles in a medium is along the direction of the wave (parallel). *
    8·1 answer
  • A pin fin of uniform, cross-sectional area is fabricated of an aluminum alloy (k = 160 W/m-K). The fin diameter is D = 4 mm, and
    14·2 answers
  • After heating a 10.00 g sample of potassium chlorate, a student obtains an amount of oxygen calculated to be 3.90 g. Theoretical
    6·1 answer
  • Explain the costruction and working of windmill
    8·1 answer
  • One method used to determine the volume of solids and liquids is displacement.
    9·2 answers
  • Please give a explanation if possible Tysm!
    6·2 answers
  • The principle of conservation of linear momentum can be strictly applied during a collision between two particles provided the t
    15·1 answer
  • HELP ME OUT PLEASE!!!!!
    12·2 answers
  • A 2.0 kg book is lying on a 0.78 m -high table. You pick it up and place it on a bookshelf 2.1 m above the floor.Part ADuring th
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!