The electromagnetic waves are:
Radio waves
Ultraviolet waves
And Infrared waves
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Answer:
38 m/s
43 m/s
Explanation:
x = 18t + 5.0t²
The instantaneous velocity is the first derivative:
v = 18 + 10.t
At t = 2.0:
v = 18 + 10.(2.0)
v = 38 m/s
The average velocity is the change in position over change in time.
v = Δx / Δt
v = [ (18t₂ + 5.0t₂²) − (18t₁ + 5.0t₁²) ] / (t₂ − t₁)
Between t = 2.0 and t = 3.0:
v = [ (18(3.0) + 5.0(3.0)²) − (18(2.0) + 5.0(2.0)²) ] / (3.0 − 2.0)
v = [ (54 + 45) − (36 + 20.) ] / 1.0
v = 99 − 56
v = 43 m/s
Answer:
9 ft*lb
Explanation:
super simple but you just have to understand that the integral is going with the curve
work = integral a to b of f(x)dx = integral 0 to 9 of 10/(1+x)^2dx = 9ft*lb
The ability for CO2 to warm the surface of a planet through the absorption of infrared radiation is well known. What is much less appreciated, however, is just how effective of a gas it is in maintaining the greenhouse framework that helps to characterize the modern climate.
Answer:
The temperature rise is .
Explanation:
Given the mass of the hammer is 1.19 kg.
And the speed of the hammer is 8.4 m/s.
We need to find the temperature change of iron nail having 20 hammer blows.
First, we will find the kinetic energy of the each blow of hammer.
For 20 such blows, the kinetic energy will be
Let us assume that the nail absorbs all the kinetic energy. So, this 839.8 J will be converted into heat energy .
Now,
Also, we know that
Where,
is the mass of the nail, which is
is the specific heat capacity of iron, which is 449 J/kg.K
is the change in temperature.
Plug these value we get,
We can see the temperature rise is 143.9 K.