If you were designing a security system that uses light to detect an intruder, why would it be important to know about the diffe
2 answers:
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Answer:
Current in each branch will be 2.5 A
Explanation:
We have given that a circuit has three branch each has a resistance of 37.5 ohm
We have also given that a total current of 7.5 A is flows through the circuit
As we know that in parallel circuit total current is the sum of current flowing through each branch
As the resistances of each branch is same so current will also be same
As there is 3 branches in circuit so current in each branch will be
Answer:
E = 1.24MeV
Explanation:
The photon travels at the speed of light, 3.0 × m/s, and given that its frequency = 1 picometer = 1.0 ×
m.
Its energy can be determined by;
E = hf
= (hc) ÷ λ
where E is the energy, h is the Planck's constant, 6.626 × Js, c is the speed of the light and f is its frequency.
Therefore,
E = (6.626 × × 3.0 ×
) ÷ 1.0 ×
= 1.9878 × ÷ 1.0 ×
E = 1.9878 × J
But, 1 eV = 1.6 × J. So that;
E =
= 1242375 eV
∴ E = 1.24MeV
The energy of the photon is 1.24MeV.
The displacement of the book is 5 meters
Explanation:
The work done by a force when moving an object is given by:
where :
F is the magnitude of the force
d is the displacement
is the angle between the direction of the force and the displacement
In this problem, we have:
W = 500 J is the work done by Maria
F = 100 N is the force applied by Maria
, assuming the direction of the force is parallel to the displacement
So we can rearrange the equation to solve for d, the displacement:
So, the book was moved 5 meters.
Learn more about work:
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