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
devlian [24]
3 years ago
12

Over a time interval of 1.99 years, the velocity of a planet orbiting a distant star reverses direction, changing from +20.7 km/

s to -22.0 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s2) during this interval. Include the correct algebraic sign with your answers to convey the directions of the velocity and the acceleration.
Physics
1 answer:
madam [21]3 years ago
8 0

Answer:

(a) - 42700 m/s

(b) - 6.8 x 10^-4 m/s^2

Explanation:

initial velocity of star, u = 20.7 km/s

Final velocity of star, v = - 22 km/s

time, t = 1.99 years

Convert velocities into m/s and time into second

So, u = 20700 m / s

v = - 22000 m/s

t = 1.99 x 365.25 x 24 x 3600 = 62799624 second

(a) Change in planet's velocity = final velocity - initial velocity

  = - 22000 - 20700 = - 42700 m/s

(b) Accelerate is defined as the rate of change of velocity.

Acceleration = change in velocity / time

                     = ( - 42700 ) / (62799624) = - 6.8 x 10^-4 m/s^2

You might be interested in
When magnesium fluoride reacts with iodine, the products are fluorine and magnesium iodide. What would the equation be?
likoan [24]

Answer:

Explanation:

Every chemical reaction can be represented by simple chemical equations that shows how compounds are combining to give some products.

Such reactions are usually made up of:

     Reactants on the left hand side

     Products on the right hand side

            Reactants  →  Products

In this given problem;

            Reactants are :   Magnesium fluoride  = MgF₂

                                             Iodine in form of Iodide   = I₂

           Product : Magnesium iodide  = MgI₂

             

               MgF₂   +     I₂    →       MgI₂   +   F₂

   

                             

   

7 0
3 years ago
Location X is next to Location Y and they are both much colder than Location Z. Which statement is most likely true?
Dahasolnce [82]
Locations X and Y are at the poles. Hope this helps!
3 0
3 years ago
7. A bicycle accelerates at 2.0 m/s2. If the mass of the bicycle and rider together is
kkurt [141]

Answer:

170 N

Explanation:

Since Force F = ma were m = mass = 85 kg and a = acceleration = 2.0 m/s².

So the net force on the bicycle is

F = ma = 85 kg × 2.0 m/s² = 170 N

4 0
3 years ago
If an experiment involves a large volume of liquid a _______ would most likely be used to hold it.
Grace [21]
The answer is d a beacker
3 0
2 years ago
Read 2 more answers
Which of the following is true about scientific models? (2 points) Select one: a. Models are used to simplify the study of thing
Vanyuwa [196]

Question: Which of the following is true about scientific models?  Select one: A) Models are used to simplify the study of things. B) Computer models are the most reliable kind of model. C) Models explain past, present and future information. D) A model is accurate if it does not change over time.

Answer: <u>A) Models are used to simplify the study of things.</u>

<em>Hope this helps!.</em>

<em>~~~~~~~~~~~~~~~~~~~~~~</em>

<em>~A.W~ZoomZoom44</em>

5 0
3 years ago
Read 2 more answers
Other questions:
  • Determine for which class of lever the output force is always greater than the input force. for which class is the output force
    14·2 answers
  • Which one of the following bodies has only potential energy?
    8·1 answer
  • Three differences between orbital motion and axial motion of the earth.
    10·1 answer
  • Which point refers to the epicenter of an earthquake?
    8·2 answers
  • Suppose you are given the following equation, where xf and xi represent positions at two instants of time, vxi is a velocity, ax
    13·1 answer
  • The reason a person finds it easier to float in salt water compared with fresh water is that in salt water...
    13·1 answer
  • Can aurora be found in other planets?
    5·2 answers
  • How can energy crisis be aberted?​
    5·1 answer
  • What is thermal energy.
    12·2 answers
  • The process by which solids vaporize without first becoming a liquid is called.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!