Answer: average speed = 92 km/h
Explanation:
1) Data:
distance 1 = 86 km
time 1 = 1 hour
distance 2 = 98 km
time 2 = 1 hour
average speed = ?
2) Formula:
average speed = distance / time
3) distance = distance 1 + distance 2 = 86 km + 98 km = 184 km
4) time = time 1 + time 2 = 1 h + 1 h = 2h
5) average speed = 184 km / 2h = 92 km/h
A study assessing the effect of anxiety Sound intensity, I, from a spherical source is a function of the distance, r, from the source of the sound.
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This is a Wheatstone bridge, and the ratio of R2 to R1 equals the ratio of Rx to R3. As a result, if R2 is increased, R3 should be reduced by a factor of two.
<h3>Explain Wheatstone bridge?</h3>
A Wheatstone bridge is a type of electrical circuit that is used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one of which contains the unknown component.
The Wheatstone bridge circuit can be used to compare an unknown resistance RX to others of known value, such as R1 and R2, which have constant values and R3 which can be variable.
If we connected a voltmeter, ammeter, or galvanometer between points C and D, and then changed resistor R3 until the meters read zero, the two arms would be balanced, and the value of RX (substituting R4) would be known as indicated.
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As the plastic sphere is charged, therefore it experience an electric force when placed in an electric fields and also experiences gravitational force acts downward so the electric force must act upward.
Let 
is electric force and 
is gravitational force.
If these forces are balanced, therefore
or 
Given, 
and 
.
Substituting these values in above equation we get,
Thus, the magnitude of electric field is 
.
As the charge is negative, the electric field at the location of the plastic sphere must be pointing downward.
