Answer:
a) 6.7 * 10⁴ W b) 8.5* 10¹⁰ W/m²
Explanation:
a) The power of one laser pulse, by definition of power, is equal to the energy expended during the emission of the pulse, divided by the time during which the energy was present, as follows:
P = ΔE/Δt = 10⁻³ J / 15*10⁻⁹ sec = 6.7* 10⁴ W
b) The intensity, or power density, of the light wave, is just the power that we just calculated in a) divided by the cross-section area traversed by the pulse, which is a circle of 1.0 mm diameter.
So, we can write the following expression:
I = P/A = P / π*(d²/4) = 6.7*10⁴ W /( π*(10⁻³)²/4) m² = 8.5* 10¹⁰ W/m²
Answer:
Gravitational Potential Energy
Explanation:
Gravitational potential energy is energy an object possesses because of its position in a gravitational field (Hyper Physics). The potential energy is the energy that is stored in an object due to its position relative to some zero position(Physics Classroom).
For a body held at a height (h), the gravitational potential energy is capable to do work once the object is released from the height (h)
Answer:
F = -11199.63 N
Explanation:
given,
mass of the brick = 12 Kg
height of the fall, h = 1.9 m
thickness of the carpet = 2 cm = 0.02 m
average force = ?
velocity of brick just before hitting mat
v = 6.11 m/s
velocity of brick just before hitting ground= 6.11 m/s
final velocity = 0 m/s
using equation of motion for acceleration calculation.
v² = u² + 2 a s
0² = 6.11² + 2x a x 0.02
a =-933.3025 m/s²
now, average force is equal to
F = m a
F = 12 x (-933.3025)
F = -11199.63 N
negative sign represent the decelerating force.
Answer:
Wouldn't it be the muscles in your arms or legs since they have to push the most while they have gravity acting upon them?
Explanation:
