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
Norma-Jean [14]
3 years ago
7

Need help with both questions!

Physics
1 answer:
xenn [34]3 years ago
7 0
#14 isn't really a Physics problem.  It's more of just reading a graph.

A). When speed changes, acceleration is

       (change in speed) / (time for the change) .

To be correct about it, acceleration can be positive ... when speed
is increasing ... or it can be negative ... when speed is decreasing.
So, on this graph, there are two periods of acceleration:

From zero to 2 seconds, acceleration = (8 m/s) / (4 sec) = 2 m/s² .

From 10 to 12 seconds, acceleration = (-4 m/s) / (2 sec) = -2 m/s² .

B). From 12 to16 seconds, you can read the speed right from
the graph.  It's 4 m/s .

C).  From 2 to 10 seconds, the objects speed is a steady 8 m/s.
Covering 8 m/s every second for 8 seconds, it covers 64 meters.
Do you remember that distance is the area under the speed/time
graph?  You can see that plainly on this graph.  From 2 to 10 sec,
there are 16 blocks.  Each block is (2 m/s) high and (2 sec) wide,
so its area is (2 m/s) x (2 sec) = 4 meters.  The area of 16 blocks
is (16) x (4 meters) = 64 meters.
====================================

#15.

a).  constant velocity on a distance graph is a line that slopes up;
constant velocity on a velocity graph is a horizontal line;

b). positive constant acceleration on a distance graph is a
line that curves up;
positive constant acceleration on a velocity graph is a
straight line that slopes up;

c).  "uniformly slowing down to a stop" on a distance graph
is a line that's less and less curved as time goes on, and
eventually reaches the x-axis.
"uniformly slowing down to a stop" on a velocity graph is
a straight line that slopes down, and stops when it reaches
the x-axis.




You might be interested in
The image formed by the pinhole camera is smaller than that of the object <br> true or false
Zina [86]

Answer: True? since it has a small hole it would depend on how far away the camera is to the object.

4 0
3 years ago
‼️HELP HELP HELP‼️
Reil [10]

Answer:

sr Idontknow this

Explanation:

5 0
1 year ago
Definition of fluoresence
denis23 [38]

Answer:

the property of absorbing light of short wavelength and emitting light of longer wavelength.

Explanation:

YW

4 0
3 years ago
Read 2 more answers
A car has wheels which spin forwards. As the wheels spin forwards, they grip the road and push the road backwards. Since forces
alexandr402 [8]

Answer:

the law of motion

Explanation:

because the wheels are moving it means motion i am not sure which number law it is but I believe that it is 2nd but u should look it up to be safe

6 0
3 years ago
Read 2 more answers
In thermodynamics, a closed system is a system where _____
Nady [450]
In a closed system, energy in form of heat (work) can be exchanged but not matter.

The answer to your question is C.

Hope it helped!
3 0
2 years ago
Other questions:
  • Select the best terms from the drop-down menus that fit the nuclear medicine descriptions.
    9·2 answers
  • (SHOULDN'T BE HARD!!!!) How does gravity impact two objects in space?
    11·1 answer
  • Use the equation d = st, where d = distance, s = speed, and t = time. If you ride
    15·1 answer
  • Calculate the work done when a 10 N force pushes against a cart 4.0 m
    15·2 answers
  • Lighting is to thunder as lunch
    9·2 answers
  • A person raises a box with a weight of 50 newtons by 0.5 meter. How much work does the person do in this action?(1 point)
    12·1 answer
  • [4] A tortoise and a hare cover the same distance in a race. The hare goes very fast but stops frequently while the tortoise has
    14·1 answer
  • On top of a 3 m tall shelf sits a lonely 4.5 kg toy snake. How much GPE does this snake have if the shelf is on Earth? (g = 9.8
    10·1 answer
  • A ball is still live when
    11·1 answer
  • Which phenomenon supports the particle model of light?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!