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zimovet [89]
4 years ago
10

Direct current, DC, flows in a _________ direction while alternating current, AC, the direction of flow ___________. A) single,

is unidirectional B) constant, periodically reverses C) opposite direction, is multiple D) periodically reversing, is constant
Physics
2 answers:
Mademuasel [1]4 years ago
5 0

Answer:

B

Explanation:

I just had it on USA Test Prep

kramer4 years ago
4 0
The flow of Direct current (DC) is constant and flows in one direction. Most digital electronics make use of DC. Alternating current (AC) periodically flows in reverse and is mostly used to deliver power to houses, buildings and the like. With that alone, you can already rule out A, C and D. 

The answer would then be B. constant, periodically reversing. 
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A toy car has a 1.5 A current, and its resistance is 2 . How much voltage does the car require?
Arisa [49]

Answer:

3 Volts

Explanation:

Using Ohm's Law

         Voltage=current x resistance

              V = I x R

              V = 1.5 x 2

              V = 3 V

6 0
3 years ago
Why do mass numbers have a trailing decimal? use the following words describe for credit isotopes protons neutrons electrons in
Dmitry_Shevchenko [17]

Answer:a number without a decimal are generally not significant. Isotopes are atoms of same element which have the same atomic number but different number of neutrons. Isotopes of elements are represented in the following way: In an atom, the number of protons is equal to its atomic number.. An atom of an element is neutral in nature so atom contains the same number of protons and electrons.

Explanation:

3 0
4 years ago
In trying to understand the psychology of addiction, Dr. Jackson focuses on the neurochemical changes that occur, Dr. Fong focus
attashe74 [19]

Answer:

Psychology is theoretically diverse.

Explanation:

The theme, 'Psychology is theoretically diverse' means that the psychology has many various views and points. This is because when people make many observations they can go several and many different ways with these observations. This is why Psychology has many perspectives. The differing perspectives provide complete understanding of the human behavior more effectively.

Hence, different perspectives of the three professionals mentioned illustrate this theme.

8 0
3 years ago
Spitting cobras can defend themselves by squeezing muscles around their venom glands to squirt venom at an attacker. Suppose a s
Nezavi [6.7K]

Answer: 1.124 m

Explanation:

This situation is a good example of the projectile motion or parabolic motion, and the main equations that will be helpful in this situations are:  

x-component:  

x=V_{o}cos\theta t   (1)  

Where:  

V_{o}=2.80 m/s is the initial speed  

\theta=39\° is the angle at which the venom was shot

t is the time since the venom is shot until it hits the ground  

y-component:  

y=y_{o}+V_{o}sin\theta t+\frac{gt^{2}}{2}   (2)  

Where:  

y_{o}=0.4 m  is the initial height of the venom

y=0  is the final height of the venom (when it finally hits the ground)  

g=-9.8m/s^{2}  is the acceleration due gravity

Knowing this, let's begin:

First we have to find t from (2):

0=0.4 m+2.8 m/s sin(39\°) t+\frac{-9.8m/s^{2}t^{2}}{2}   (3)

Rearranging (3):  

-4.9 m/s^{2} t^{2} + 1.762 m/s t + 0.4 m=0   (4)  

This is a <u>quadratic equation</u> (also called equation of the second degree) of the form at^{2}+bt+c=0, which can be solved with the following formula:  

t=\frac{-b \pm \sqrt{b^{2}-4ac}}{2a} (5)  

Where:  

a=-4.9  

b=1.762  

c=0.4  

Substituting the known values:  

t=\frac{-1.762 \pm \sqrt{(1.762)^{2} - 4(-4.9)(0.4)}}{2(-4.9)} (6)  

Solving (6) we find the positive result is:  

t=0.517 s (7)

Substituting (7) in (1):

x=2.8 m/s cos(39\°) (0.517 s)   (8)

Finally:

x=1.124 m   (9)

4 0
4 years ago
You would like a pendulum that swings back and forth once every 2 seconds, but the one you have swings once every 1.9 seconds. W
patriot [66]

Your pendulum does a complete swing in 1.9 seconds.  You want to SLOW IT DOWN so it takes 2.0 seconds.

Longer pendulums swing slower.

You need to <em>make your pendulum slightly longer</em>.

If your pendulum is hanging by a thread or a thin string, then its speed doesn't depend at all on the weight at the bottom.  You can add weight or cut some off, and it won't change the speed a bit.  

6 0
4 years ago
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