A student drops a 1.5 kg rock off of a 4.0 m tall bridge. The speed of the rock just before it hits the water below is 6 m/s. How much energy was lost due to air resistance?

Energy due to air resistance = 31.8 Joules

Explanation:

According to the law of conservation of energy, energy can neither be created nor destroyed but can be transformed from one form to another

Kinetic Energy + Energy due to air resistance = Potential energy(1)

If there is no energy loss due to air resistance, potential energy = kinetic energy

mass, m = 1.5 kg

height, h = 4.0 m

speed, v = 6 m/s

Kinetic energy = 0.5 mv²

Kinetic energy = 0.5 * 1.5 * 6²

Kinetic energy = 27 Joules

Potential Energy = mgh

Potential energy = 1.5 * 9.8 * 4

Potential energy = 58.8 Joules

From equation (1)

27 + Energy due to air resistance = 58.8

Energy due to air resistance = 58.8 - 27

Energy due to air resistance = 31.8 Joules

Explanation:

Note:

Air resistance in the way means not all of the potential energy can be converted to kinetic energy.

Given:

Mass = 1.5 kg

D = 4 m

Vf = 6 m/s

Energy + KE = PE

= (M × g × d) - (1/2 × M × V^2)

= (1.5 × 9.8 × 4) - (1/2 × 1.5 × 6^2)

= 58.8 - 27

= 31.8 J

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.

the ima (higher than 1m) will be greater than the ima with the height of 1m.