Answer:
WRITE ONE ADVANTAGE AND ONE DISADVANTAGE OF ALCOHOL AS A LIQUID USED IN THERMOMETERS
Advantage: Alcohol has a high expansivity.
Disadvantage: Alcohol is not opaque, this may give wrong temperature readings.
DIFFERENCE IN FORCES BETWEEN SOLID AND GAS PARTICLES :
Answer: Solids have stronger intetmolecular forces of attraction than gases.
TWO FACTORS TO INCREASE RATE OF EVAPORATION IN LIQUID :
Answer: Decreasing the volume of the container containing the liquid. This will increase vapour pressure as well the rate of evaporation .
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Answer:
Explanation:
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Selective serotonin reuptake inhibitors (SSRIs) such as Prozac, Paxil and Zoloft improved the treatment of depression and other related disorders when they were introduced in the market in the 1980s. SSRIs are a type of drugs that are commonly used as antidepressants in the treatment of depressive and anxiety disorders.<span> </span>
Answer:
T= 224.01 N
Explanation:
in imminent motion we have to :
- The frictional force reaches its maximum value
- The system is in balance of forces
Data
W= 500 N : weight of the log
μs = 0.5
μk = 0.35
α = 30°above the ground : angle of the cable attached to the log
Newton's first law to the log:
∑F =0 Formula (1)
∑F : algebraic sum of the forces in Newton (N)
Forces acting on the log
T: cable tension for impending movement
N: normal force
W : weight
f: frictional force , f= μsN
We apply the formula (1)
∑Fx=0
Tx-f = 0
Tcosα-μsN=0
Tcos30°-0.5N=0 Equation (1)
∑Fy=0
N+Ty-W=0
N+Tsin30°-500=0
N= 500-Tsin30° Equation (2)
We replace the value of N of the Equation (2) in the equation (1)
Tcos30°-0.5(500-Tsin30°) = 0
Tcos30°+0.5Tsin30° = 0.5*500
T( cos30°+0.5*sin30°) = 250
(1.116) T = 250
T= 250/1.116
T= 224.01 N
Answer:
b. electrons drift slowly toward the positive end of the wire
Explanation:
Motion of electrons constitutes current. According to Ohm's law, the current in the wire is directly proportional to the potential difference across the two ends of the wire.
I ∝ V
⇒V = I R
When potential difference is put, the electrons towards the positive end. Thus, option b is correct.