Answer:
50.4÷1.18= 42.7m/s as speed is equal to the distance over the time taken
Answer:
5.16×10¹⁵ s
Explanation:
Considering the rotational motion of the Earth,
K.E. = ω² where, I = MR²
= MR²ω² ---------(1) where ω = angular velocity of Earth
To find ω,
ω = 2π/T where T = time period of Earth
= 2π/(60×60×24) = 7.27×10^-5 rad/s
Substituting the values in (1),
K.E. = 0.4×(6×10^24)×(6400000)²×(7.27×10^-5)²
= 5.16×10²⁹ J
To calculate possible time,
Time = Energy/ Power
= 5.16×10²⁹ / 10¹⁴
= 5.16×10¹⁵ s
not sure which average this is but one of the averges is 12.5 m/s^2... it's been a while since physics so I'm a little rusty
btw, to find this average you have to divide 60 by 4 to get 15m/s^2.
next you divide 60 by 6 to get 10m/s^2.
then you add 15 and 10 to get 25.
finally, you divide 25 to get 12.5m/ s^2.
Answer:
Explanation:
1.
vf = vi + a(t)
vi = 0 m/s
a = 17/13
= 1.3 m/s^2
2.
F = M * a
= 15 * 1.3
= 19.62 N
3.
Normal force, Fn = m * g
= 15 * 9.8 m/s²
= 147 N.
Then find the maximum force of friction, knowing that μs = 0.76
Ff = Fn × μs
= 147 * 0.76
= 111.83 N
Maximum acceleration,
Ff = m × a
111.83 = 15 * a
a = 7.4556 m/s²
4.
In order to find the acceleration for the box, you need to know the net force of the box moving in the x direction and the frictional force, and you will end up with the Force of the vehicle minus the Frictional force (Ff) between the box and the vehicle, resulting your net force in the x direction.
F = m*a and Ff = μ * N
m*a = μk * N
m*a = μk * m * g
a = μk * g
a = 0.61 * 9.81
5.98 m/s^2 for the acceleration of the box on top of the vehicle.
5.
Assuming the box has re settled and is no longer sliding when braking begins and the surface remains horizontal, the maximum negative acceleration will again be
a = -7.4556 m/s².
I can't write an essay for you but i will give you some examples.
Many things today is dependent of electricity.
Phones, tvs gone.
No way to spread media.
satellites in space would fall on to earth causing damage and wreck.
Chaos would erupt.
Imagine what would happen to food and farms around the world.