Answer:
The potential difference across iron wire is 133.95 V
Solution:
As per the question:
Length, l = 2.97 m
Diameter. d = 0.88 mm =
Voltage, V = 157 V
Now,
We know that the resistivity of iron,
Resistivity of copper,
Now,
The potential difference across the iron wire:
V' =
V' =
Answer:
Explanation:
Period of oscillation ∝ √ m
So period of oscillation is proportional to square root of mass
So when mass increases , period too will be increased . But the total energy will remain the same as per conservation of energy.
Hence option ( D) is the correct answer.
Answer:
It can exert a greater force through a greater distance than the force used on the machine.
Explanation:
A machine is a device that makes work easier and so it should exert greater force than the force applied on it.
The maximum possible value for d is <u>33.4 m</u>.
The bear chases the tourist with a speed v₁ and the tourist runs with a speed v₂. The distance between the tourist and the car is d and the distance between the tourist and the bear is 22 m. for the tourist to reach the car safely, he should cover the distance d in the same time as the bear, which covers a distance d+22 m.
Therefore,
Substitute 3.8m/s for v₂ and 6.3 m/s for v₁. Solve for d.
The maximum distance between the tourist and his car, for him to be safe from the chasing bear is <u>33.4 m.</u>