<span>834kph
........................</span>
Answer:
No
Explanation:
According to physics, the work done by porter is zero but in reality porter gets tired as muscular energy is being used up.
In physics, work is the dot product of force and displacement. when the porter moves with the luggage, the weight act downwards while the porter moves forward. The angle between force and displacement is 90°. Thus, work done by the porter is zero.
The muscles are doing work in this case which is not calculated in physics.
Power is the rate of energy consumed during the work.
Answer:
1) energy = 15.6 kWh, 2) total_cost = $ 2.03
Explanation:
1) The energy dissipated is the product of the power and the time of use In a month it was used t = 6.5 h and the power of the toaster is
P = 2400 W = 2,400 kW
energy = P t
energy = 2,400 6.5
energy = 15.6 kWh
using rounding to a decimal
energy = 15.6 kWh
2) The cost of energy is unit_cost = $ 0.13 / kWh
so the total cost
total_cost = energy unit_cost
total_cost = 15.6 0.13
total_cost = $ 2.028
rounding to two decimal places
total_cost = $ 2.03
Answer:
A) Zero newtos
Explanation:
To solve this exercise, let's use Newton's first and second law, in the first law it is established that every body is at rest or moving with constant speed if the external forces are zero. In the second law it is determined that the sum of the force is proportional to the acceleration of the body.
Let us apply our case, the body is at constant speed which implies that the sum of all external forces is zero. In addition, there is no friction, so we do not need a force that counteracts them.
Consequently, the force applied must be zero.
The answer's 25,000 joules
half m v squared
half 2000, x 5 squared
