Initial velocity v = 86.6 m / s
angle ,theta = 63.7 degrees
(A). the horizontal component of the shell's initial velocity = v cos 63.7 = 38.36 m / s
vertical component of shells' initial velocity = v sin 63.7 = 77.63 m / s
(B). time taken to reach maximu height t = v sin (theta ) / g
= 7.922 s
(C). Maximum height H = ( v sin(theta) )^ 2/ 2g
= 307.5 m
(D). Required distance = v^ 2 *sin2(theta) / g
= 607.9 m
(E). Horizontal component of accleraton = 0
vertical component of accleration = g = 9.8 m / s^ 2
(F). horizontal component of velocity at required point = v cos (theta ) = 38.36 m / s
vertical compoent of velocity at required point = 0
Answer:
In a collision, the velocity change is always computed by subtracting the initial velocity value from the final velocity value. If an object is moving in one direction before a collision and rebounds or somehow changes direction, then its velocity after the collision has the opposite direction as before.
Answer:
4. The voltage is reduced by a factor of 2
Explanation:
The relationship between voltage, current and resistance in a circuit is given by Ohm's law:
V = RI
where
V is the voltage
R is the resistance
I is the current
In this problem,
the resistance in the circuit is halved: R' = R/2
the current is constant : I' = I
So the new voltage is
so the voltage is reduced by a factor 2.
Answer:
The resistance must be 6.67
Solution:
Resistance,
Resistance,
For the current to be the same when the switch is open or closed, the resistances must be connected in parallel as current is distributed in parallel with the same voltage across the circuit:
Thus in parallel:
Answer:
Dry cells have high energy density or power stored to weight ratio.
Explanation:
(1) dry cell are light in weight and small in size
(2) dry cell can be transported from one place to another
(3) there is no fear of leakage in dry cell
(4) they can easily be used to run simple electrical devices