Answer:
125 V
Explanation:
Given,
Power ( P ) = 500 W
Current ( I ) = 4 A
To fine : -
Potential difference ( V ) = ?
Formula : -
P = V I
V = P / I
= 500 / 4
V = 125 V
Therefore,
the potential difference across the ends of the heating element is 125 V.
The efficiency of the appliance is 0.62 (62%)
Explanation:
The relationship between the power of the appliance and the energy used by it is
where
P is the power
E is the energy transferred in input
t is the time elapsed
For this appliance,
P = 7 W
So, in t = 42 s, the energy transferred in input is
We are told that the useful energy in output however is
Therefore, the efficiency of the appliance is
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Answer: When you fire a gun from the perspective of newton's third law there is an equal and opposite reaction. This is what makes the bullet go forward and the gun kick back.
Explanation: when you fire a gun you pull the trigger, after you pull the trigger a mechanism in the gun goes forward very quickly to strike the primer on the bullet. The bullet will propel forward causing the gun to go backward into your shoulder.
Answer:
33= 0+10 * t so t = 33 / 10 = 3.3 hrs
Explanation:
X-rays are almost same as the visible light as they both electromagnetic waves with same speed. However, the only difference the energy level of photons of X- rays are higher than those of the visible light. This is because the frequency of the X-rays are higher.
E=
h= plank's constant and \nu is the frequency of the wave. So, higher the frequency higher will be the energy of the wave.