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
soldi70 [24.7K]
3 years ago
9

A ball starts from rest and rolls down a hill at a constant acceleration of 5 m/s2. If it travels for 8 m how fast is it going i

n the end?
Physics
1 answer:
makkiz [27]3 years ago
5 0

Hi there!

We can use the following kinematic equation:

v_f^2 = v_i^2 + 2ad

vf = final velocity (? m/s)
vi = intial velocity (0 m/s)

a = acceleration (5 m/s²)

d = displacement (8 m)

Plug in the givens and solve.

v_f^2 = 0 + 2(5)(8)\\\\v_f = \sqrt{80} = \boxed{8.944 \frac{m}{s}}

You might be interested in
What element is produced when the isotope bismuth-213 emits a beta particle
rusak2 [61]

Answer:

a

Explanation:

4 0
3 years ago
A ray of light passes from air into a block of clear plastic. How does the angle of incidence in the air compare to the angle of
andre [41]

Answer:

The angle of incidence is greater than the angle of refraction

Explanation:

Refraction occurs when a light wave passes through the boundary between two mediums.

When a ray of light is refracted, it changes speed and direction, according to Snell's Law:

n_1 sin \theta_1 = n_2 sin \theta_2

where :

n_1 is the index of refraction of the 1st medium

n_2 is the index of refraction of the 2nd medium

\theta_1 is the angle of incidence (the angle between the incident ray and the normal to the boundary)

\theta_2 is the angle of refraction (the angle between the refracted ray and the normal to the boundary)

In this problem, we have a ray of light passing from air into clear plastic. We have:

n_1=1.00 (index of refraction of air)

n_2=1.50 approx. (index of refraction in clear plastic)

Snell's Law can be rewritten as

sin \theta_2 =\frac{n_1}{n_2}sin \theta_1

And since n_2>n_1, we have

\frac{n_1}{n_2}

And so

\theta_2

Which means that

The angle of incidence is greater than the angle of refraction

6 0
3 years ago
Alan rents a private jet for the weekend. He flies 400 km south to New York, then flies 700 km west to Chicago, then 1200 km to
Ratling [72]

Answer:

Total distance = 400+700+1200= 2300km

Explanation:

the resultant of d 1st right angle triangle + 1200

= 806.2 + 1200 = 2006.2km

7 0
3 years ago
Quick please and will give Brainliest!!!
masha68 [24]

25 nC

That is the answer

3 0
3 years ago
Read 2 more answers
Why should you use control while during an experiment?
Sergio039 [100]
To provide a greater certainty that the observed results are not by chance.
8 0
3 years ago
Other questions:
  • A motor with an input power of 100 Watts is connected to a flywheel . How long in units of hours must the motor operate to trans
    6·1 answer
  • Two forces, F1 and F2, act at a point. F1 has a magnitude of 8.60 N and is directed at an angle of 55.0 ∘ above the negative x a
    11·1 answer
  • What kind of motion is the motion of the “flying bully”? How much and what is
    11·1 answer
  • How are ocean ridges formed
    9·2 answers
  • A circuit was set up as shown in the diagram . The tgree resistors are identical
    10·1 answer
  • A temperature of 20°C is equal to ? °F.
    13·2 answers
  • 6. On a quiet day, the atmospheric pressure results in a force of about 10,0000 N on a window pane with an area of 1 square mete
    7·1 answer
  • Choose ALL of the answers that would support the theory of Continental Drift?
    14·2 answers
  • In a reaction the mass of a reactant decreases by 58g in 233 seconds. What is the rate?
    6·1 answer
  • Because energy is conserved, the “lost” energy has actually been changed into other forms. Looking at the two sleds, what effect
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!