Answer:
11.25m
Explanation:
Given parameters:
Initial velocity = 0m/s
Time of running = 3s
Acceleration = 2.5m/s²
Unknown:
Displacement = ?
Solution:
To solve this problem, we apply one of the motion equations.
S = ut + at²
u is the initial velocity
t is the time taken
a is the acceleration
S = (0 x 3) + ( x 2.5 x 3²) = 11.25m
Answer:
418.6 J
Explanation:
We know the specific heat for water is 4.186 kJ/kg * °C, so this can also write as 4.186 J/g * °C, so the heat increases 5 C in this question, so you can get 4.186(J/g * C) * 5C * 20g = 418.6 J
Power delivered = (energy delivered) / (time to deliver the energy)
Power delivered = (4,000 J) / (0.5 sec)
Power delivered = 8,000 watts
I'm a little surprised to learn that Electro draws his power from the mains. This is VERY good news for Spiderman ! It means that Spiderman can always avoid tangling with Electro ... all he has to do is stay farther away from Electro than the length of Electro's extension cord.
But OK. Let's assume that Electro draws it all from the mains. Then inevitably, there must be some loss in Electro's conversion process, between the outlet and his fingertips (or wherever he shoots his bolts from).
The efficiency of Electro's internal process is
<em>(power he shoots out) / (power he draws from the mains) </em>.
So, if he delivers energy toward his target at the rate of 8,000 watts, he must draw power from the mains at the rate of
<em>(8,000 watts) / (his internal efficiency) . </em>
Answer:
The required heat energy is .
Explanation:
The heat energy 'Q' required to raise the temperature of water is given by
where 'M' is the mass of water, 's' is the specific heat capacity of water and '' is the change of temperature.
Given, and we know that the specific heat capacity of water is .
Substituting the values in the above expression, the required heat energy is
Answer:
7.5 * 10^(14) Hz to 9.375 * 10^(14) Hz.
Explanation:
The minimum wavelength, λ₁ = 320 nm = 3.2 * 10⁻⁷ m
The corresponding frequency can be obtained by using the formula of speed of light:
c = λ₁ * f₁
f₁ = c / λ₁
f₁ = ( 3 * 10^8) / (3.2 * 10^(-7))
f₁ = 9.375 * 10^(14) Hz
The maximum wavelength, λ₂ = 400 nm = 4 * 10⁻⁷ m
The corresponding frequency can be obtained by using the formula of speed of light:
c = λ₂ * f₂
f₂ = c / λ₂
f₂ = ( 3 * 10^8) / (4 * 10^(-7))
f₂ = 7.5 * 10^(14) Hz
The frequency range of UVA is therefore 7.5 * 10^(14) Hz to 9.375 * 10^(14) Hz.