Answer:
The amount of gravitational potential energy an object has depends on its height and mass. The heavier the object and the higher it is above the ground, the more gravitational potential energy it holds. Gravitational potential energy increases as weight and height increases.
Explanation:
1 MHz --- 1 000 000 Hz
99.5 MHz --- x
x = 99 500 000 Hz = 99,5x10^6 Hz
v = λ . f
c = λ . f
3x10^8 = λ . 99,5x10^6
λ = 3x10^8 / 99,5x10^6
λ ≈ 0,0302x10^2
<em>λ ≈ 3,02 m</em>
i think is the letter (B), isn't it?
Answer:
t_pass = 2.34 m
t_stop = 4.68 s
Thus, for the car passing at constant speed the pedestrian will have to wait less.
Explanation:
If the car is moving with constant speed, then the time taken by it will be given as:
where,
t_pass = time taken = ?
D = Distance covered = 23 m
v = constant speed = (22 mi/h)(1609.34 m/1 mi)(1 h/3600 s) = 9.84 m/s
Therefore,
<u>t_pass = 2.34 m</u>
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Now, for the time to stop the car, we will use third equation of motion to get the acceleration first:
Now, for the passing time we use first equation of motion:
<u>t_stop = 4.68 s</u>