For a questions which involves constant acceleration, you can use the SUVAT equations.
S - displacement - -26.5m ( If you to take the right as a positive value - since displacement is a vector quantity involving direction and magnitude)
U
V - Final Velocity - unknown
A - Acceleration - -1.8m/s^2
T - Time - 3.81s
s = vt - 1/2at^2
-26.5m = 3.81v - 1/2 • -1.8 • 3.81^2
Rearrange
-26.5m/-1/2•-1.8•3.81^2=3.81v
3.81v = -2.028~
v = -0.532~ (3sf)
Hope this helps the answer is: <span>Relation between Electric and magnetic fields. I've read that both the electric and magnetic field
vectors are perpendicular to each other in an electromagnetic wave.
Passing steady current through a straight conductor shows some magnetic flux because most of the energy is wasted into outer space as magnetic lines</span>
Answer:
Approximately 3.03 seconds.
Explanation:
The distance traveled in the vertical direction is given by the kinematic equation:
Where <em>v</em>_<em>iy</em> and <em>a</em> are the initial velocity and acceleration of the object, respectively, in the vertical direction.
Because the rock is thrown horizontally, there is no horizontal velocity. Therefore:
The vertical acceleration is simply gravity <em>g. </em>This, this yields the general equation:
Substitute 45 m for <em>y</em> and solve for time <em>t:
</em>
Therefore, it will take approximately 3.03 seconds for the rock to fall 45 meters vertically.
Refraction. refraction is always accompanied by a wavelength and speed change
Answer:
25.9 m/s
Explanation:
mass of ball, m = 0.145 kg
initial velocity, u = + 32 m/s
It bounce back with the velocity but in opposite direction so final velocity,
v = - v
Impulse, I = - 8.4 Ns
Impulse is defined as the change in momentum
I = m v - mu = m (v - u)
- 8.4 = 0.145 x (- v - 3 2)
- 57.9 = - v - 32
v = 57.9 - 32 = 25.9 m/s
Thus, the final speed of the ball is 25.9 m/s