They are energy inefficient
Explanation:
The main reason why we must change away from using incandescent lighting bulbs is because of their energy inefficiency.
- Much of the power consumed is used in producing heat in an incandescent bulb.
- Therefore, they are energy inefficient.
- Energy saving bulbs produces less heat and they are more durable.
- Most energy saving bulbs are typically more expensive.
- Most incandescent bulbs are also not environmentally friendly.
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Answer:
false
Explanation:
if an object is accelerating the object will not travel the same distance every time interval
Answer: B. meteorites, UV rays
The earth's atmosphere plays an important role in shielding the space rocks and meteorites enters inside the earth due to collision with the celestial body. Due to high heat and pressure in the mesospheric layer of the atmosphere these meteorites burned up before reaching the biosphere or hydrosphere system of the earth. The UV rays are protected from entering into the earth atmosphere by the ozone layer present in the stratosphere of the atmosphere. Both meteorites and UV rays can negatively effect the human population. Therefore, the atmosphere is an agent which provides protection against them.
Answer:
a) x₁ = 290.50 feet
, x₂ = 169.74 feet
, b) v_max= 41 mph
Explanation:
For this exercise we will work in two parts, the first with Newton's second law to find the acceleration of vehicles
X Axis fr = m a
Y Axis N-W = 0
N = W = mg
The force of friction has the expression
fr = μ N
We replace
μ mg = ma
a = μ g
g = 32 feet / s²
Let's calculate the acceleration for each coefficient and friction
μ a (feet / s2)
0.599 19.168
0.536 17,152
0.480 15.360
0.350 11.200
These are the acceleration values, for the maximum distance we use the minimum acceleration (a₁ = 11,200 feet / s²) and for the minimum braking distance we use the maximum acceleration (x₂ = 19,168 feet / s²)
v² = v₀² - 2 a x
When the speed stops it is zero
x₁ = v₀² / 2 a₁
Let's reduce speed
v₀ = 55mph (5280 foot / 1 mile) (1h / 3600s) = 80,667 feet / s²
Let's calculate the maximum braking distance
x₁ = 80.667² / (2 11.2)
x₁ = 290.50 feet
The minimum braking distance
x₂ = 80.667² / (2 19.168)
x₂ = 169.74 feet
b) maximum speed to stop at distance x = 155 feet
0 = v₀² - 2 a x
v₀ = √2 a x
We calculate the speed for the two accelerations
v₀₁ = √ (2 11.2 155)
v₀₁ = 58.92 feet / s
v₀₂ = √ (2 19.168 155)
v₀₂ = 77.08 feet / s
To stop at the distance limit in the worst case the maximum speed must be 58.92 feet / s = 40.85 mph = 41 mph
Answer:
b) total energy input equals total energy output
Explanation:
The first law of thermodynamics is a generalization of the conservation of energy in thermal processes. It is based on Joule's conclusion that heat and energy are equivalent. But to get there you have to get around some traps along the way.
From Joule's conclusion we might be tempted to call heat "internal" energy associated with temperature. We could then add heat to the potential and kinetic energies of a system, and call this sum the total energy, which is what it would conserve. In fact, this solution works well for a wide variety of phenomena, including Joule's experiments. Problems arise with the idea of heat "content" of a system. For example, when a solid is heated to its melting point, an additional "heat input" causes the melting but without increasing the temperature. With this simple experiment we see that simply considering the thermal energy measured only by a temperature increase as part of the total energy of a system will not give a complete general law.
Instead of "heat," we can use the concept of internal energy, that is, an energy in the system that can take forms not directly related to temperature. We can then use the word "heat" to refer only to a transfer of energy between a system and its environment. Similarly, the term work will not be used to describe something contained in the system, but describes a transfer of energy from one system to another. Heat and work are, therefore, two ways in which energy is transferred, not energies.
In an isolated system, that is, a system that does not exchange matter or energy with its surroundings, the total energy must remain constant. If the system exchanges energy with its environment but not matter (what is called a closed system), it can do so only in two ways: a transfer of energy either in the form of work done on or by the system, either in the form of heat to or from the system. In the event that there is energy transfer, the change in the energy of the system must be equal to the net energy gained or lost by the environment.
