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Rufina [12.5K]
4 years ago
12

Tim is given a new quantity called Electrical Current. Which of the following questions could Tim ask to determine whether the q

uantitiy is a vector or a scalar?
O A Who discovered electric current?
O B. What are the base units of electric current?
OC. What is the symbol for electric current?
O D. Does electric current have a direction?
Physics
1 answer:
uysha [10]4 years ago
4 0

Answer:

B. What are the base units of electric current?

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An object's inertia causes it to come to a rest position.
stellarik [79]

Answer:

no

Explanation:

the inertia of an object does not make it to come to rest, this is normally caused by friction

3 0
3 years ago
A pulley consists of a wrapped around a
mamaluj [8]
Of a rope wrapped around a pulley chain
6 0
3 years ago
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If 190 grams of water is cooled from 42.7°C to 21.2° C how much energy was lost by the water?
yanalaym [24]

Answer:

Energy lost by the water is 17.1 x 10³ J .

Explanation:

Specific heat is defined as the amount of energy per unit mass needed to raise the temperature of the substance by a one degree Celsius.

Heat energy gain or loss by any substance is given by :

Q = m x C x ( T₁ - T₂ )     .....(1)

Here m is the mass of the substance, C is specific heat of the substance and T₁ and T₂ are the initial and final temperature of the substance.

According to the problem,

Mass of water, m = 190 gm

Specific heat of water, C = 4.186 J gm⁻¹ ⁰C⁻¹

Initial temperature, T₁ = 42.7⁰ C

Final temperature, T₂ = 21.2⁰ C  

Substitute these values in equation (1).

Heat energy loss by water = 190 x 4.186 x ( 21.2 - 42.7 )

                                            =  -17.1 x 10³ J

In the above value, negative sign denotes the loss in energy.

7 0
4 years ago
The skater lowers her arms as shown in the adjacent
galina1969 [7]

Answer:

is there more?

Explanation:

4 0
3 years ago
A certain airplane has a speed of 290.0 km/h and is diving at an angle of 0 : 30.0" below the horizontal when the pilot releases
prisoha [69]

Answer:

10.03 s is the time the decoy is in the air

Explanation:

From the information given we know:

  • \theta_{0}=-30 because is measured clockwise from horizontal.
  • The initial speed of the decoy is the plane's speed at the moment of release v_{0}=290 \:\frac{km}{h}

We will need to work in meters and m/s, so 290 \:\frac{km}{h} \cdot \frac{1000 \:m}{km} \cdot \frac{1\:h}{3600\:s} = 80.56 \:\frac{m}{s}

The horizontal motion of a projectile is given by:

x-x_{0}=v_{0x}\cdot t

because v_{0x}=v_0cos(\theta_{0}), this becomes

x-x_{0}=(v_0cos(\theta_{0}))\cdot t

We have that \Delta x= 700\:m, solving for <em>t, </em>we have

t=\frac{\Delta x}{v_{0}cos\theta_{0}} \\t=\frac{700 \:m}{(80.56 \:\frac{m}{s} )\cdot cos(-30)} \\t= 10.03 \:s

5 0
3 years ago
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