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
vesna_86 [32]
3 years ago
7

What makes the north star, polaris, special?

Physics
1 answer:
Mama L [17]3 years ago
7 0
It's the only star in the sky (visible from the northern hemisphere) that never seems to move. It stays at almost exactly the same point in the sky, while the other stars all circle around it once a day.
You might be interested in
HELP ASAP! <br>why is rolling friction much smaller than sliding friction? Also give an example.​
IceJOKER [234]

Answer:

Rolling friction is much smaller than sliding friction because Rolling friction is considerably less than sliding friction as there is no work done against the body that is rolling by the force of friction. For a body to start rolling a small amount of friction is required at the point where it rests on the other surface, else it would slide instead of roll.

Rolling Friction example: Anything with weels (cars,skateboards) or a ball rooling.

Sliding Friction example: Bicycle brakes,skinning your knee walking,writing.

6 0
3 years ago
Marys airplane trip took 5.8 hours for one-half of that time, the airplane flew at a constant speed of 640 miles per hour and fo
Olenka [21]
Distance is speed x time.  Half of the trip is 5.8/2 = 2.9hrs.
640 x 2.9 = 1856mi
580 x 2.9 = 1682mi
1856mi+1682mi=3538mi.

You could also calculate her average speed.  This is easy since it was divided in two equal time slices.  Average Speed = (640+580)/2 = 610mi/hr
Now 610mi/hr x 5.8hrs = 3538mi
7 0
3 years ago
What has more kinetic energy 15 kg ball rolling north at 15 m/s or a 15 kg ball rolling backwards at 7m/s
Setler79 [48]

Answer:

15 kg ball

Explanation:

6 0
3 years ago
What will happen to the Sun after it loses so much mass that its gravity
Natali5045456 [20]

Answer:

The answer is C

Explanation:

7 0
2 years ago
Read 2 more answers
A car starts from rest and accelerates uniformly over a time of 18 seconds for a distance of 390 m. Determine the acceleration o
Sergeeva-Olga [200]

Answer:

a=2.4\ m/s^2

Explanation:

Given that,

The initial speed of a car, u = 0

Time, t = 18 s

Distance, d = 390 m

We need to find the acceleration of the car. Let it is a. Using the second equation of motion to find it.

d=ut+\dfrac{1}{2}at^2

or

d=\dfrac{1}{2}at^2\\\\a=\dfrac{2d}{t^2}\\\\a=\dfrac{2\times 390}{(18)^2}\\\\a=2.4\ m/s^2

So, the acceleration of the car is 2.4\ m/s^2.

5 0
3 years ago
Other questions:
  • Lucas plugs a lamp into the wall. The light bulb in the lamp turns on. What kind of energy transformation is this? A.)Light ener
    9·2 answers
  • How are the helium atoms in this model different from real helium atoms?
    14·2 answers
  • A 120 g coconut falls 12 m. What is the kinetic energy of the coconut just before it hits the ground?
    13·1 answer
  • Use the picture to answer the question.
    6·2 answers
  • Which of these is the best description of the Frye Standard?
    11·2 answers
  • The table below describes 100 offspring of the same two parents. What are the most likely genotypes of the parents?
    9·2 answers
  • What are SI units, and why are they used?
    5·2 answers
  • Calculate equivalent resistance in the following between points P and Q​
    12·2 answers
  • A baseball is launched horizontally from a height of 1.8 m. The baseball travels 0.5 m before hitting the ground.
    7·2 answers
  • What was the average velocity for the entire trip?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!