Answer:
Correct answer: a = 15.46 m/s²
Explanation:
The formula for accelerated movement with the given data is:
V² - V₀² = 2 · a · d where the initial velocity V₀ and the final V
Since the initial velocity V₀ is zero, the formula is:
V² = 2 · a · d => a = V² / (2 · d) = 27.8² / (2 · 25) = 772.84 / 50 = 15.46 m/s²
a = 15.46 m/s²
God is with you!!!
The acceleration of gravity (on Earth) is 9.8 m/s² downward.
This means that every falling object gains 9.8 m/s more downward speed
every second that it falls.
In 5 seconds of falling, it gains (5 x 9.8 m/s) = 49 m/s of downward speed.
If it was already descending at 2.0 m/s at the beginning of the 5 sec,
then at the end of the 5 sec it would be descending at
(2 m/s + 49 m/s) = 51 m/s .
The main cause of the seasons is earths orbit since each time were in a new season the planet is facing the earth a different way which causes winter etc..
Answer:
Approximately 
.
Approximately 
. (assumption: the LED here is an Ohmic resistor.)
Explanation:
The two resistors here 
and 
are connected in parallel. Their effective resistance would be equal to
.
The current in a serial circuit is supposed to be the same everywhere. In this case, the current through the LED should be 
. That should also be the current through the effective 
resistor. Make sure all values are in standard units. The voltage drop across that resistor would be
.
The voltage drop across the entire circuit would equal to
- the voltage drop across the resistors, plus
- the voltage drop across the LED.
In this case, that value would be equal to 
. That's the voltage that needs to be supplied to the circuit to achieve a current of 
through the LED.
Assuming that the LED is an Ohmic resistor. In other words, assume that its resistance is the same for all currents. Calculate its resistance:
.
The resistance of a serial circuit is equal to the resistance of its parts. In this case,
.
Again, the current in a serial circuit is the same in all appliances.
.
