3 years ago

Why is it harder pushing a car than pushing a bike?

2 answers:

5 0

Answer:

When inertia increases, it's because the mass increased, which increases the normal force, which ultimately increases friction.

Wittaler [7]3 years ago

4 0

A car is heavier and bigger while the bike is lighter and smaller

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At 20°c, the resistance of a sample of nickel is 525 ohms. what is the resistance when the sample is heated to 70°C?

Ipatiy [6.2K]

The resistance of the sample is $682.5\Omega$

Explanation:

The relationship between resistance of a material and temperature is given by the equation

$R(T)=R_0(1+\alpha (T-T_0))$

where

$R_0$ is the resistance at the temperature $T_0$

$\alpha$ is the temperature coefficient of resistance

For the sample of nickel in this problem, we have:

$R_0 = 525 \Omega$ when the temperature is $T_0 = 20^{\circ}C$

While the temperature coefficient of resistance of nickel is

$\alpha = 0.006/^{\circ}C$

Therefore, the resistance of the sample when its temperature is

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$R=(525)(1+0.006(70-20))=682.5 \Omega$

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