The work required to stop the car is equal to the amount of kinetic energy that the car currently has. This is given by E=(1/2)mv^2. Since the energy is proportional to the square of the velocity, that factor will have the greatest influence on the work required to stop it.

4 0

3 years ago

ArbitrLikvidat [17]

Answer:

D) Number of electrons.

Explanation:

Elements in the same group on the periodic table has the same number of electrons. These electrons are those involved in bonding with other atoms to form compounds.

3 0

3 years ago

A spring with spring constant of 33 N/m is stretched 0.15 m from its equilibrium position. How much work must be done to stretch

Hoochie [10]

Work done is 0.442J

<u>Explanation:</u>

Given:

Spring constant, k = 33 N/m

Distance, x₁ = 0.15m

Additional distance, x₂ = 0.072 m

Total distance = 0.15 + 0.072 m

= 0.222 m

Work done, W = ?

We can calculate work done by the formula

$W = \frac{1}{2}kx_2^2 - \frac{1}{2}kx_1^2$

On substituting the value we get:

$W = \frac{1}{2}k [(x_2)^2 - (x_1)^2]\\ \\W = \frac{1}{2} X 33[(0.222)^2 - (0.15)^2]\\ \\W = \frac{1}{2}X 33 [ 0.0493 - 0.0225]\\ \\W = 0.442 J$

Therefore, work done is 0.442J

7 0

3 years ago