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a. 10 Amps

b. 22 Ohms

c. 220 kW·h

d. $13.2

Explanation:

a. The question is with regards electric power, "P", which is given as follows;

P = I × V

Where;

P = The power generated by electric current

I = The current flowing in the circuit (through the resistance, R)

V = The voltage in the circuit

The given parameters of the electric oven are;

The resistance of the electric oven = R

The power consumed by the electric oven, P = 2200 W

The voltage at which the electric oven is working, V = 220 V

Therefore, from the equation for power, P = I × V, we have;

I = P / V

Therefore, we have;

I = 2,200 W/(220 V) = 10 Amps

b. The velocity, V = I × R

Where;

I = The current flowing

R = The resistance of the circuit

By making "R" the subject of the equation for voltage, "V", we have;

R = V/I = 220 V/(10 A) = 22 Ohms

c. The number of hours per day the resistor is used = 4 hours

The number of hours the resistor is used in 1 month (30 days) = 30 × 4 hours, t = 120 hours

The electric energy, E = P × t = 2200 W × 120 h = 220000 W·h = 220 kW·h

d. If electric energy costs, C = 0.06$/kW·h

Therefore, the cost to operate the electric oven during 1 month = 0.06$ × 220 kW·h = $13.2

b.) They have a frequency of 2 hertz.

Explanation:

The frequency of a wave is the number of complete oscillations (cycles) made by the wave in one second.

Instead, the wavelength is the distance between two consecutive crests (highest position) or 2 troughs (lowest position) of the wave.

In this problem, we are told that the leaf does two full up and down bobs: this means that it completes 2 full cycles in one second. Therefore, its frequency is

where is called Hertz (Hz). So, the correct answer is

b.) They have a frequency of 2 hertz.