The complete cycle of moon phases runs 29.531... day. You're describing exactly half if that ... roughly 14.77 days.
Explanation and answer:
To solve this problem, we use the kinematics equation:
v^2-u^2=2aS .........................(1)
where
assuming the positive direction is downwards)
v = final velocity (when it reaches ground)
u = 0 = initial velocity (when it was dropped, or released, with zero vertical velocity).
a = 9.81 m/s^2 = acceleration due to gravity (on earth's surface)
S = 90m = distance travelled.
Substitute values into (1)
v^2 - 0^2 = 2*(9.81)*90
v^2 = 1765.8 m^2/s^2
v = sqrt(1765.8) m/s
= 42.02 m/s
= 42 m/s (to two significant figures).
Since both the speeder and the state trooper are moving at the same
speed and same direction, therefore there would be no or zero Doppler shift.
In order to have a Doppler shift, the distance or separation between the
state trooper and the speeder must also be changing with time. Which in this
case, the distance remains the same or constant since they are moving alike.
This is just like what would occur if they were both standing still or parked.
<span>So this further means that the frequency of sound is the same as the
frequency heard by the speeder. Therefore the Doppler "shift" of the
frequency on the speeder would be
<u>zero. </u></span>
Answer:
<h2>
The magnitude of force F is 18N</h2>
Explanation:
The magnitude of the force in the set up can be solved for using the principle of moment. According to the principle, the sum of clockwise moment is equal to the sum of anticlockwise moments.
Moment = Force * perpendicular distance
Clockwise moments;
The force that acts clockwise is the unknown Force F and 4N force. If the beam rests on a pivot 60 cm from end X and a Force F acts on the beam 80 cm from end X, the perpendicular distance of the force F from the pivot is 80-60 = 20cm and the perpendicular distance of the 4N force from the pivot is 60-50 = 10cm
Moment of force F about the pivot = F * 20
Moment of 4N force about the pivot = 4*10 = 40Nm
Sum of clockwise moment = 40+20F...(1)
Anticlockwise moment;
The 8N will act anticlockwisely about the pivot.
The distance between the 8N force and the pivot is 60-10 = 50cm
Moment of the 8N force = 8*50
=400Nm...(1)
Equating 1 and 2 we have;
40+20F = 400
20F = 400-40
20F = 360
F = 18N
The magnitude of force F is 18N
Baking a cake creates a endothermic reaction. When heated, the baking soda/powder reacts, the eggs change form, and everything else follows suit. The baking soda/powder creates the rising of the cake.
