Answer: 42 N-s
Explanation: The area under the curve is equal to the impulse, so you take the area of the two triangles and add it to the area of the rectangle.
Area of a triangle: 1/2bh
Area of a rectangle: bxh
2(1/2x2x7)=14+(4x7)=42 N-s
Current = (voltage) / (resistance)
= (1.5 V) / (0.35 ohms)
= 4.28 Amperes.
==> The battery will not last long.
==> The ammeter is broken ... it's reading less than 0.25 Amps.
Answer:
Explanation:
As we know that the speed of car A and car B is given by
&
now we know that both cars are decelerated by same deceleration and stopped finally
so the distance moved by the car is given by the equations
similarly we have
now we know that
Answer:
Both wires have the same resistivity.
Explanation:
The resistivity of a material depends on the following factors:
- The nature of the material, i.e., the number density of free electrons of the material.
- The temperature of the material.
The resistance R of a wire of resistivity , length l and cross-sectional area A is given by
On varying the length and cross-sectional area of the wire, the resistance of the wire is changed but resistivity does not change as it is an intrinsic property of the material of the wire.
For the two given wires, the length and the cross-sectional area are different, but both the wires are of copper which means the number density of free electrons on both the wires is same and both the wires are placed in same environmental condition, which means the temperature would also be same.
Thus, the resistivities of both the wire are same.