A pendulum with string length 1.5 m is dropped from rest. If the mass at the end of the pendulum is 23 kg, what is its initial potential energy?

P.E = 338.1 Joules

Explanation:

Potential energy can be defined as an energy possessed by an object or body due to its position.

Mathematically, potential energy is given by the formula;

Where, P.E represents potential energy measured in Joules.

Given the following data;

Height = 1.5m

Mass = 23kg

Acceleration due to gravity, g = 9.8m/s² (since it's falling from rest)

Substituting into the equation, we have;

P.E = 338.1 Joules

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.