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
Fed [463]
3 years ago
7

A mobile starts with a speed of 250m / s and begins to decelerate at a rate of 3m / s². How fast is it after 45s?

Physics
1 answer:
Korvikt [17]3 years ago
4 0

\large{ \underline{ \underline{ \bf{ \purple{Given}}}}}

  • Speed of the mobile = 250 m/s
  • It starts decelerating at a rate of 3 m/s²
  • Time travelled = 45s

\large{ \underline{ \underline{ \bf{ \green{To \: find}}}}}

  • Velocity of mobile after 45 seconds

\large{ \underline{ \underline{ \red{ \bf{Now, \: What \: to \: do?}}}}}

We can solve the above question using the three equations of motion which are:-

  • v = u + at
  • s = ut + 1/2 at²
  • v² = u² + 2as

So, Here a is acceleration of the body, u is the initial velocity, v is the final velocity, t is the time taken and s is the displacement of the body.

\large{ \bf{ \underline{ \underline{ \orange{Solution:}}}}}

We are provided with,

  • u = 250 m/s
  • a = -3 m/s²
  • t = 45 s

By using 1st equation of motion,

⇛ v = u + at

⇛ v = 250 + (-3)45

⇛ v = 250 - 135 m/s

⇛ v = 115 m/s

✤ <u>Final</u><u> </u><u>velocity</u><u> </u><u>of</u><u> </u><u>mobile</u><u> </u><u>=</u><u> </u><u>1</u><u>1</u><u>5</u><u> </u><u>m</u><u>/</u><u>s</u>

<u>━━━━━━━━━━━━━━━━━━━━</u>

You might be interested in
How many moles of h2 gas would be contained in 4.00 of the gas at 202.6KPa and 127c?
JulsSmile [24]

Answer : The volume of one mole of gas is dependent of temperature and pressure.

Explanation:

At <span><span>0o</span>Cand1atm</span> one mole of an ideal gas would be <span>≈22.4L</span>, which is the same as <span>22.4d<span>m3</span></span>

If you double the pressure, the same amount (mole) of gas would take up only half the space.

If the temperature changes (and pressure stays constant), the gas will expand or contract by about <span>1%/<span>3o</span></span>.

4 0
3 years ago
A circular wooden loop of mass m and radius R rest on a flat horizontal friction less surface. A bullet, also of mass m, and mov
bearhunter [10]

Answer:

w = vR/3

Explanation:

The centre of mass of the loop to bullet system is given by D / 4 from centre of loop, which is equivalent to R / 2 from its centre.

From the principle of conservation of linear momentum , we have

m*v = 2*m* Vcm

Where v = velocity of bullet, Vcm = velocity of wood

Hence, we have  

Vcm = v2

Also, from the conservation of angular momentum about the centre of mass.

M*V*(R/2) = Ic*w - equation (I)

where Ic = moment of inertia and w = angular velocity

Ic for a ring is given by mr^2 + m(r/2)^2

Ic of a bullet is given by m(r/2)^2

Hence, the moment of inertia of the system  is given by the summation of the two moments of inertia Ic(ring) + Ic(bullet) which gives

Ic(system) = 3*m*R^2/2

Substituting back into equation (I), we have

m*v*R^2=3*m*R^2*w/2

Hence, we obtain w =vR/3

w=v3R

4 0
3 years ago
Fossils found in the La Brea tar pits indicate a California climate that was A) similar to today's climate. B) similar to the pr
NikAS [45]

Answer:

i believe it is D but not 100% sure

Explanation:

3 0
3 years ago
Read 2 more answers
HELP the decay curve of twizzlers sheet!!!!!
Vinvika [58]
Ok so the first thing you need to do is im not gonna help you
7 0
2 years ago
PSYW - Please Show Your Work
Ad libitum [116K]

Answer:

9.66E4 J

Explanation:

7 0
3 years ago
Other questions:
  • A car traveling at 26 m/s starts to decelerate steadily. It comes to a complete stop in 5 seconds. What is its acceleration?
    11·1 answer
  • The maximum number of eletrons that can occupy a 3p sublevel is
    8·1 answer
  • What is earth's average distance from the sun called?
    13·2 answers
  • Rihanna can go from 0-60 miles per hour in 3.5 seconds. Calculate the acceleration.
    11·1 answer
  • All of the planets stay near the ecliptic as they move on the Celestial Sphere
    14·1 answer
  • A horse shoe magnet is placed on a mass balance such that a uniform magnetic field of magnitude B runs between it from North to
    8·1 answer
  • Two billiard balls with the same mass m move towards one another. Ball one travels in the positive x-direction with a speed of v
    10·1 answer
  • Sound travels as transverse waves through matter.
    8·1 answer
  • Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which c
    5·1 answer
  • What is 2f In concave mirrors?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!