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Alex787 [66]
3 years ago
8

A car is traveling at 30m/s it accelerates steadily for 5 s after which it is travelling at 50 m/s calculate its acceleration?

Physics
2 answers:
Natalka [10]3 years ago
7 0
Formula for acceleration: a = v-v0/t
a is acceleration, v is final velocity and v0 is starting velocity, t is time
Now plug it in
a = 50m/s - 30 m/s = 20 m/s/ 5s = 4 m/s^2
The acceleration is 4 m/s^3
Mashcka [7]3 years ago
4 0
For this question , we should apply
a = v - u by t
Given - u = 30m/s
v = 50m/s
t = 5 secs
Solution :
a = v - u by t
a = 50 - 30 by 5
a = 20 by 5
( cut 5 and 20 because 5 x 4 = 20 )
a = 4 m/s^2

.:. The acceleration is 4 m/s^2
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The black board appears black because:
marishachu [46]

Answer:

I think its C All visible light wavelengths (ROYGBV) are absorbed by the board

8 0
3 years ago
What is the magnitude of the dipole moment formed by separating a proton and an electron by 100 pm
amm1812

<span>When two electrical charges, of opposite sign and equal magnitude, are separated by a distance, a dipole is established. The size of a dipole is measured by its dipole moment</span><span> . Dip</span>ole moment is measured in Debye units, which is equal to the distance between the charges multiplied by the charge

<span>Dipolemoment 'D' = e x d where e= charge and d= distance by which charge is separated. </span><span>
In this case e = charge on electron = 1.6 x10^-19 C</span>

D = 1.6 x10^-19 C ( 1x10^-10 m) =1.6x10^-29 Cm

3 0
4 years ago
A block of aluminium of density 7900 kg/m3 has a volume of 250 cm. Find the<br>mass of the block.​
pashok25 [27]

Answer:

mass of block=2.7 gm

Explanation:

concept: Density=mass/volume

given:ρ=2700 kg/m^3 and v=250 cm^3 (in cm^3 not in m^3)

=> v= convert cm^3 to m^3

there fore= 1 cm^3=1 cm*1 cm*1 cm

i.e 1 cm^3=1/100*1/00*1/100 m^3 => 1 cm^3=1/1000000 m^3

ρ=m/v

=>mass=ρ*volume

=>mass=2700*1/10^-6

=>mass=2.7*10^-3 kg =>2.7 gm

8 0
3 years ago
football game customarily begins with a coin toss to determine who kicks off. The referee tosses the coin up with an initial spe
LuckyWell [14K]

Answer:

1.28 m

Explanation:

You are given the initial speed that is 5 m/s. Since the coin is sent upwards, this means that the speed is positive according to the co-ordinate system in the y axis. Additionally, there is the gravity that curbs the coin in the opposite direction making the final speed becomes zero at the highest point, so the gravity takes negative sign.

So, from the explanation we have:

Vo = 5 m/s

V = 0 m/s

a = -9.8 m/s^2

so, we use the following equation to find y (hight)

V^2 = Vo^2 + 2ay

y = V^2 - Vo^2 / 2a

y = (0 m/s)^2 - (5 m/s)^2 / 2*(-9.8 m/s^2)

y = - (25 m^2 / s^2) / -19.6 m /s^2

y = 1.28 m

3 0
3 years ago
A plane travels at a speed of 205mph in still air. Flying with a tailwind, the plane is clocked over a distance of 1000 miles. F
vaieri [72.5K]

While plane is moving under tailwind condition it took time "t"

so here we will have

t = \frac{d}{v_{net}}

here net speed of the plane will be given as

v_{net} = v + v_w

t = \frac{1000}{205 + v_w}

similarly when it moves under the condition of headwind its net speed is given as

v_{net} = v - v_w

now time taken to cover the distance is 2 hours more

t + 2 = \frac{1000}{205 - v_w}

now solving two equations

\frac{1000}{205 + v_w} + 2 = \frac{1000}{205 - v_w}

solving above for v_w we got

v_w = 40.4 mph

6 0
3 years ago
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