Mechanical advantage of a machine is the ratio of the output force over the input force or M=Fo/Fi. Since M=1, Fi=Fo, or the input force is equal to the output force. This means that to raise the refrigerator that weighs 900 N, we need the same input force of 900 N, or Fo=Fi=900 N.
Answer:
R = 1.8 m
Explanation:
This is a simple harmonic movement exercise, at the bottom of the swing the acceleration is vertical upwards and the speed is tangential to the trajectory, that is horizontal; the expression for the centralized acceleration is
= v² / R
R = v² /a_{c}
where the radius is equal to the length of the swing
let's calculate
R = 8.1 / 4.5
R = 1.8 m
The particles themselves do not change in size. When changing state the distance between the particles is what changes due to overcoming the intermolecular forces between the particles.
Answer:
Frequency
Explanation:
A period is the number of revolutions in a minute.
Also, frequency can be defined as number of oscillation per unit time.
Mathematically, frequency is given by the formula;
Thus, we can deduce that frequency of an oscillation is the inverse of the period (time) of oscillation.
Mathematically, period is expressed as;
This ultimately implies that, an object's period of oscillation can always be used to solve for frequency.
Answer:
55 mph
Explanation:
Distance = speed × time, so time = distance / speed.
If x is the speed of the wind, then:
220 / (385 + x) = 165 / (385 − x)
Cross multiply:
220 (385 − x) = 165 (385 + x)
Distribute:
84,700 − 220 x = 63,525 + 165 x
Combine like terms:
21,175 = 385 x
Solve for x:
x = 55
The speed of the wind is 55 mph.