Answer:
Approximately 3.03 seconds.
Explanation:
The distance traveled in the vertical direction is given by the kinematic equation:
Where <em>v</em>_<em>iy</em> and <em>a</em> are the initial velocity and acceleration of the object, respectively, in the vertical direction.
Because the rock is thrown horizontally, there is no horizontal velocity. Therefore:
The vertical acceleration is simply gravity <em>g. </em>This, this yields the general equation:
Substitute 45 m for <em>y</em> and solve for time <em>t:
</em>
Therefore, it will take approximately 3.03 seconds for the rock to fall 45 meters vertically.
Answer:
0.273 MHz
Explanation:
The frequency f₁ of the reflected waves to the stationary detector is given by
f₁ = f(v + v₁)/(v - v₂) where f = frequency of sound waves = 0.225 MHz, v = speed of sound in air = 343 m/s, v₁ = speed of detector = speed of truck = 33.0 m/s and v₂= speed of source of reflected wave = speed of truck = 33.0 m/s
f₁ = f(v + v₁)/(v - v₂)
= 0.225MHz(343 m/s + 33 m/s)/(343 m/s - 33 m/s)
= 0.225MHz × 376/310
= 0.273 MHz
Answer:
100 A.
Explanation:
From the question given above, the following data were obtained:
Electrochemical equivalent (Z) = 0.0012 g/C
Mass (M) = 36 g
Time (t) = 5 mins
Current (I) =?
Next, we shall determine the charge. This can be obtained as follow:
Electrochemical equivalence (Z) = 0.0012 g/C
Mass (M) = 36 g
Charge (Q) =.?
M = ZQ
36 = 0.0012 × Q
Divide both side by 0.0012
Q = 36 / 0.0012
Q = 30000 C
Next, we shall convert 5 mins to s. This can be obtained as follow:
1 min = 60 s
Therefore,
5 mins = 5 × 60
5 mins = 300 s
Finally, we shall determine the current. This can be obtained as shown below:
Charge (Q) = 30000 C
Time (t) = 300 s
Current (I) =?
Q = It
30000 = I × 300
Divide both side by 300
I = 30000 / 300
I = 100 A
Therefore, the current is 100 A.
Potholder should have high insulation and low conductivity, therefore the correct answer is the option B
<h3>What is insulation?</h3>
Insulation is a type of material used to create barriers to the transmission of the form of energy which either is in form of heat or electricity.
For outdoor trips in cold weather, several thin layers act as better insulating barriers for heat transfer.
The ability of an electric charge or heat to pass through a material is measured by its conductivity. A material is considered a conductor if it offers very little resistance to the flow of thermal or electric energy.
Thus, Potholders should be highly insulated and have low conductivity, therefore the correct answer is the option B
Learn more about insulation from here
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your question seems incomplete, the complete question is
To be effective, a pot holder should have low _____. viscosity conductivity malleability density