The equation that relates distance, velocities, acceleration, and time is, d = V₀t + 0.5gt² where d is distance, V₀ is the initial velocity, t is time, and g is the acceleration due to gravity (equal to 9.8 m/s²)
(1) Dropped rock, (3 x 10² m ) = 0(t) + 0.5(9.8 m/s²)(t²) The value of t from this equation is 24.73 s
(2) Thrown rock with V₀ = 26 m/s (3 x 10² m) = (26)(t) + 0.5(9.8 m/s²)(t²) The value of t from the equation is 5.61 s
The difference between the tim, difference = 24.73 s - 5.61 s difference = 19.12 s
you can figure out the time that the dropped ball to hit the ground quite easily because u = 0 m/s, therefore
s = (1/2)at²
t² =2s/a
t = sqrt(2s/a)
assuming the acceleration from gravity is 9.81 m/s²
t = sqrt(2*300m/9.81 m/s²)
t = 7.8 s
You can use the quadratic equation to find t for the thrown rock and then subtract them. Or you can calculate the final velocity of the thrown rock with v^2 = u^2 + 2as and then use v = u + at to find the time for the thrown rock.
Why do metals conduct heat so well? The electrons in metal are delocalised electrons and are free moving electrons so when they gain energy (heat) they vibrate more quickly and can move around, this means that they can pass on the energy more quickly.
The E-field is in the +y-direction, and the B-field is in the +z-direction, so it must be moving along the +x-direction, since the E-field, B-field and the direction of moving are all at right angles to each other.
Earth's gravity is stronger at the poles than the equator for two reasons: The centrifugal "force" cancels out the gravity minimally, more so at the equator than at the poles.
