Which of these components is not necessary for current to flow in a series or parallel circuit?A. wire
B. switch
C. resistor
D. All of these are needed.

Answers

Answer 1

Answer: Current requires only an EMF source ... like a battery, or a current already flowing ... and a conducting path ... like wire, ionized air, or something dissolved in water. A switch isn't needed unless you want a quick, easy way to STOP the current. A resistor isn't needed unless you want to be able to dissipate some energy from the current, or limit its magnitude.

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One of your delivery trucks traveled 1,200 miles on 55 gallons of gas. How many miles per gallon did the truck get? (Round off your answer to the nearest hundredth.) A. 45.84
B. 21.81
C. 45.83
D. 21.82

Answers

The word "Per" means divide

"miles per gallon" is the same as "miles / gallon"

The truck went 1,200 miles
on 55 gallons

1,200 ÷ 55 = 21.81

Simply divide the two quantities to attain the correct unit.

1200 miles/55 gallons = 21.82 miles/gallon
The answer is D.

Define density and give its SI unit

Answers

Answer:

Density is defined as mass per unit volume. its SI unit is: kg/m³

Explanation:

Answer:

Density is defined as mass per unit volume. its SI unit is: kg/m³

Explanation:

from answer above

Please help on this one ?

Answers

The answer is that it is lower because it is harder to get something to move than to make it continue moving due to molecular interactions and inertia.

What is the acceleration of all objects due to gravity? What does this mean?

Answers

Every body that has larger mass has a field of attraction called gravitational field. All objects abandoned in the region of this great body is attracted to its center. The large body prints the object an acceleration which is called the acceleration of gravity.

Gravity acts on everything. The force if gravity is equal to 9.8 m/s^2

What is the current when the resistance is 5 ohms and the voltage is 10 volts?A. 10 – 5 = 5 amps

B. 10 ÷ 5 = 2 amps

C. 10 × 5 = 50 amps

D. 10 + 5 = 15 amps

Answers

Ohm's Law states V = IR
So,
I = V/R
The answer is B. 10/5=2 amps

A sinusoidal wave travels along a string. The time for a particular point to move from maximum displacement to zero is 0.13 s. What are the (a) period and (b) frequency? (c) The wavelength is 1.9 m; what is the wave speed?