When the life preserver is dropped from the helicopter, the only force acting on the object is the gravitational force. This modifies the equations of motion. Thus, the working equation is written below:
h = vt + 0.5gt²
where
v is the initial velocity
g is the acceleration due to gravity equal to 9.81 m/s²
h is the height of the fall
h = (1.46 m/s)(1.8 s) + 0.5(9.81 m/s²)(1.8 s)
h = 11.457 m
Answer:
The movement of electricity-conducting iron from the convection currents and the spinning of the earth induces a current which induces a magnetic field.
Explanation:
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Answer:
C. The number of waves that pass a particular point in a unit of time.
Explanation:
The number of waves that pass a fixed point in unit time and the number of cycles or vibrations undergone during one unit of time by a body in periodic motion is called as frequency.
A body in periodic motion is said to have undergone one cycle or one vibration after passing through a series of events or positions and returning to its original state.
The unit of frequency is Hertz.
Answer:
4.216 * 10^(-5) C
Explanation:
Parameters given:
Electrostatic force between charges, F = 4N
Distance between the charges, r = 2 m
The electrostatic force acting between two charged particles, q1 and q2, separated by a distance, r, is given as:
F = (k * q1 * q2) / r²
Where k = Coulombs constant.
Since q1 = q2 = q,
F = (k * q²) / r²
Inputting all the values:
4 = (9 * 10^9 * q²) / 2²
=> 16 = (9 * 10^9 * q²)
=> q² = 16 / (9 * 10^9)
q² = 1.78 * 10^(-9)
=> q = 4.216 * 10^(-5) C
The value of both charges is 4.216 * 10^(-5) C.