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olchik [2.2K]
3 years ago
11

Which device typically use DC current to operate?

Physics
2 answers:
aleksklad [387]3 years ago
5 0

Answer: C. wrist-watch

Explanation:

Alternating current refers to the current which changes direction. The current which is supplied to our home is alternating current which is used to run home appliances such as television, washing machine, electric hair dryer, ceiling fan etc.

A current which flows in only one direction is known as direct current. A cell or a battery is a source of direct current. A wrist watch runs on direct current provided by a cell attached to it.

Artemon [7]3 years ago
4 0
C.) Wristwatch uses DC current to operate..
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Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. When the carts collide, they hook toget
Nikitich [7]

Answer:

<em>Second option</em>

Explanation:

<u>Linear Momentum</u>

The linear momentum of an object of mass m and speed v is

P=mv

If two or more objects are interacting in the same axis, the total momentum is

P_t=m_1v_1+m_2v_2+...

Where the speeds must be signed according to a fixed reference

The images show a cart of mass 2m moves to the left with speed v since our reference is positive to the right

P_1=-2mv

The second cart of mass m goes to the right at a speed v

P_2=mv

The total momentum before the impact is

P_t=-2mv+mv=-mv

The total momentum after the collision is negative, both carts will join and go to the left side

The first option shows both carts with the same momentum before the collision and therefore, zero momentum after. It's not correct as we have already proven

The third option shows the 2m cart has a positive greater momentum than the other one. We have proven the 2m car has negative momentum. This option is not correct either

The fourth option shows the two carts keep separated after the collision, which contradicts the condition of the question regarding "they hook together".

The second option is the correct one because the mass m_2 has a negative momentum and then the sum of both masses keeps being negative

3 0
4 years ago
Read 2 more answers
The period T of a pendulum of length L is measured to determine g at the surface of Earth. The equation used is T=2π√L/g. The ma
saul85 [17]

Answer:

C: Variation in the value of g as the pendulum bob moves along its arc.

Explanation:

The formula for period of a simple pendulum is given by;

T = 2π√(L/g)

Where;

L is length

g is acceleration due to gravity

Now, from this period equation, it is clear that the only thing that can affect the period of a simple pendulum are changes to its length and acceleration due to gravity.

Looking at the options, the only one that talks about either the length or gravity as being potential causes of the error is option C

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3 years ago
TRUE if the statement is correct and write FALSE if is not.
Ket [755]

Answer:

<u>1. True</u>

<u>2. True</u>

<u>3. True</u>

<u>4. True</u>

<u>5. False</u>

Explanation:

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4. Just as the name suggests, the food pyramid is a visual representation that contains how many servings from each food group in other be healthy.

5. This is false because throughout the growth stages of life it is essential to get the needed food nutrients such as  calcium, iron, protein, and energy foods.

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Identify the fallacy (if there is one) committed in the following passage: “Atheistic philosophers have been trying for thousand
tatyana61 [14]
Lebron James is a pro athlete he played for a lot of teams
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Rashid [163]

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6 0
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