1.3-3 Determine whether each of the following statements is true or false. If the statement is false, demonstrate this by proof
or example. (a) Every continuous-time signal is an analog signal. (b) Everydiscrete-timesignalisadigitalsignal. (c) If a signal is not an energy signal, then it must be a power signal and vice versa. (d) An energy signal must be of finite duration. (e) A power signal cannot be causal. (f) A periodic signal cannot be anticausal
1 answer:
Answer:
(a)False (b)False (c)False (d)False (e)False
Explanation:
a) Continuous time signal can also be digital. e.g continuous time square waveform (see first picture)
b) A discrete time signal can also be analog. e.g discrete time exponential function can take any value (see second picture)
c) When both energy and power of signal are infinite, it is neither power signal nor energy signal e.g ramp signals, signal
d)A signal of infinite length can also have finite energy. e. g
e)Step waveform u(t) is a power signal but also causal
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<u>Answer:</u> The equations are provided below.
<u>Explanation:</u>
Skeleton equations are defined as the equations which simply indicate the molecules that are involved in a chemical reaction. These equations are unbalanced equations.
Balanced equations are defined as the chemical equation in which number of individual atoms on the reactant side must be equal to the number of individual atoms on the product side.
- For A:
Water decomposes in the direct current to form hydrogen and oxygen.
Skeleton Equation:
Balanced Equation:
- For B:
Mercury (II) oxide decomposes in heat to form mercury, oxygen.
Skeleton Equation:
Balanced Equation:
- For C:
Calcium carbonate when heated forms calcium oxide and carbon dioxide.
Skeleton Equation:
Balanced Equation:
- For D:
Group 2 hydroxides, when heated forms oxide and water vapor.
Skeleton Equation:
Balanced Equation:
Answer:
Explanation:
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In this case, since it is observed that hot cadmium is placed in cold water, we can infer that the heat released due to the cooling of cadmium is gained by the water and therefore we can write:
Thus, we insert mass, specific heat and temperatures to obtain:
In such a way, since the specific heat of cadmium and water are respectively 0.232 and 4.184 J/(g °C), we can solve for the equilibrium temperature (the final one) as shown below:
Now, we plug in to obtain:
NOTE: since the density of water is 1g/cc, we infer that 25.00 cc equals 25.00 g.
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