In physics, gravity is the natural force that causes things to fall toward the earth. The noun gravity can also mean seriousness or solemnity. Someone who conducts themselves with an air of gravity is someone who takes what they are doing seriously.
Answer:
a) 2.5 m/s. (In the opposite direction to the direction in which she threw the boot).
b) The centre of mass is still at the starting point for both bodies.
c) It'll take Sally 12 s to reach the shore which is 30 m from her starting point.
Explanation:
Linear momentum is conserved.
(mass of boot) × (velocity of boot) + (mass of sally) × (velocity of Sally) = 0
5×30 + 60 × v = 0
v = (-150/60) = -2.5 m/s. (Minus inicates that motion is in the opposite direction to the direction in which she threw the boot).
b) At time t = 10 s,
Sally has travelled 25 m and the boot has travelled 300 m.
Taking the starting point for both bodies as the origin, and Sally's direction as the positive direction.
Centre of mass = [(60)(25) + (5)(-300)]/(60+5)
= 0 m.
The centre of mass is still at the starting point for both bodies.
c) The shore is 30 m away.
Speed = (Distance)/(time)
Time = (Distance)/(speed) = (30/2.5)
Time = 12 s
Hope this Helps!!!
I can confirm it is not b.
Answer:
Satellites can gather weather data from much higher altitudes than land-based instruments can.
The spacing between the plates is 
Explanation:
The electric field in the spacing between the plates of a parallel-plate capacitor is uniform and it is given by
where
is the surface charge density
is the vacuum permittivity
We also know that the relationship between electric field and potential difference across a parallel-plate capacitor is
where
V is the potential difference
d is the spacing between the plates
Combining the two equations we get
And given that here we have:
V = 160 V
We can solve the equation for d, the spacing between the plates:
Learn more about capacitors:
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