When using the lens equation, a negative value as the solution for di indicates that the image is real. Virtual. Upright. Invert
1 answer:
Option B is correct. A negative value as the solution indicates that the image is Virtual.
<h3>What is the lens equation?</h3>The Lens formula describes the relationship between the distance of an image (v), the distance of an object (u), and the focal length (f) of the lens in optics.
The lens equation is given below;
When light beams from the same spot on an item reflect off a mirror and diverge or spread apart, virtual pictures are formed.
Hence option B is correct. A negative value as the solution indicates that the image is Virtual.
To learn more about the lens equation refer to the link;
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Answer:
Energy, 9 kWh or 32400 kJ
Explanation:
Given that,
The power of heater, P = 3 kW
It runs for 3 hours to raise the water temperature to the desired level. We need to find the amount of electric energy used. We know that the electrical power of an object is given by total energy delivered per unit time. It is given by :
E = 9 kWh
Since, 1 kWh = 3600 kJ
E = 32400 kJ
So, the amount of electric energy used is 9 kWh or 32400 kJ. Hence, this is the required solution.
Answer:
The output power is 2 kW
Explanation:
It is given that,
Number of turns in primary coil,
Number of turns in secondary coil,
Voltage of primary coil,
Current drawn from secondary coil,
We need to find the power output. It is equal to the product of voltage and current. Firstly, we will find the voltage of secondary coil as :
So, the power output is :
or
So, the output power is 2 kW. Hence, this is the required solution.
Answer:
ΔT = 302 °c
Explanation:
mass (m) = 4.6 g = 0.0046 kg
velocity (v) = 278 m/s
specific heat of lead (c) = 128 J/kg. °c
kinetic energy = 0.5 mx
kinetic energy = 0.5 x 0.0046 x
kinetic energy = 177.8 J
since all the kinetic energy is converted to thermal energy,
kinetic energy = thermal energy (E) = 177.8 J
thermal energy = m x c x ΔT
where ΔT is the temperature change
177.8 = 0.0046 x 128 x ΔT
ΔT = 177.8 / 0.59
ΔT = 302 °c