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
spin [16.1K]
3 years ago
9

A motorist enters a freeway at 45 km/h and accelerates uniformly to 99 km/h. From the odometer in the car, the motorist knows th

at she traveled 0.2 km while accelerating. Determine (a) the acceleration of the car, (b) the time required to reach 99 km/h
Physics
1 answer:
Marat540 [252]3 years ago
5 0

Answer:

a)  19440 km/h²

b) 10 sec

Explanation:

v₀ = initial velocity of the car = 45 km/h

v = final velocity achieved by the car = 99 km/h

d = distance traveled by the car while accelerating = 0.2 km

a = acceleration of the car

Using the kinematics equation

v² = v₀² + 2 a d

99² = 45² + 2 a (0.2)

a = 19440 km/h²

b)

t = time required to reach the final velocity

Using the kinematics equation

v = v₀ + a t

99 = 45 + (19440) t

t = 0.00278 h

t = 0.00278 x 3600 sec

t = 10 sec

You might be interested in
Explain why the same side of the moon is always facing Earth.
Ad libitum [116K]

Answer:

The moon keeps the same face pointing towards the Earth because its rate of spin is tidally locked so that it is synchronized with its rate of revolution (the time needed to complete one orbit). In other words, the moon rotates exactly once every time it circles the Earth.

7 0
3 years ago
Can you please give me the answers ?
rodikova [14]

Answer:

237

Explanation:

7 0
3 years ago
The magnitude of the tidal force between the International Space Station (ISS) and a nearby astronaut on a spacewalk is approxim
vovikov84 [41]

Answer:

F = 4.47 10⁻⁶ N

Explanation:

The expression they give for the strength of the tide is

      F = 2 G m M a / r³

Where G has a value of 6.67 10⁻¹¹ N m² / kg² and M which is the mass of the Earth is worth 5.98 10²⁴ kg

They ask us to perform the calculation

      F = 2 6.67 10⁻¹¹ 135  5.98 10²⁴ 13 / (6.79 10⁶)³

      F = 4.47 10⁻⁶ N

This force is directed in the single line at the astronaut's mass centers and the space station

4 0
3 years ago
Two plastic balls suspended by strings are placed close to each other. If they have the same charge, how will they interact with
vampirchik [111]
<span>Two plastic balls suspended by strings are placed close to each other. If they have the same charge then they will repel each other.</span>
8 0
3 years ago
Read 2 more answers
Nalah labels ten rats with the numbers 1 through 10. Then, she records how long it takes each rat to run through a maze. She fin
drek231 [11]

Answer:

we have to make another question we maxed it out again lol

Explanation:

5 0
3 years ago
Other questions:
  • Turquoise is what types of rocks sedimentary, metamorphic or igneous
    6·1 answer
  • What role do currents play in transporting heat? How does water temperature affect land nearby?
    14·1 answer
  • What is the final speed of a 60 kg boulder dropped from a 111 meter cliff
    10·1 answer
  • A 0.45-m metal rod moves 0.11 m in a direction that is perpendicular to a 0.80-T magnetic field in an elapsed time of 0.036 s. A
    5·2 answers
  • An electron is accelrated by a unifor electric field (1000v/m) pointing vertically upward. Use energy methods to get the magnitu
    7·1 answer
  • What are the units of the following properties? Enter your answer as a sequence of five letters separated by commas, e.g., A,F,G
    7·1 answer
  • An element's atomic number is 13. How many protons would an atom of this element have?
    5·1 answer
  • Help
    5·1 answer
  • What is the density of a 14.4 g of chromium in a rectangle with a volume of 2 cm3?​
    15·1 answer
  • How can speed be defined
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!