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3 years ago

Electricity produces work when the electrons in a conductor

2 answers:

maks197457 [2]3 years ago

6 0

Electricity produces work when the electrons in a conductor move
from one location to a location with higher potential. None of the
choices listed is correct.

Sever21 [200]3 years ago

6 0

Electricity produces work when electrons are in motion.

d. are placed in motion.

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How far will a car travel if its velocity is 15 m/s in 3 seconds? Follow example below.

svet-max [94.6K]

<h3>Solution:</h3>

Distance (d) = 112 m
Time (t) = 4 seconds
Let the speed be v.
We know, speed = Distance / Time
Therefore, v = d/t

or, v = 112 m ÷ 4 s = 28 m/s

<h3>Answer:</h3>

The speed of the cheetah is 28 m/s.

4 0

3 years ago

A block and tackle of six pulley is used to raise a load of 300N steadily through a height of 30m, if the workdone against frict

Igoryamba

Answer:

work accomplished = 300*30

= 9,000 J

applied work = 9,000 + 2,000 = 11,000 Joules

efficiency = 100 * work accomplished/work applied

= (9/11)100 = 81.8 %

force applied = (300/6)/.818

= 61.1 N

assuming that the 6 in your question refers to mechanical advantage

4 0

4 years ago

A car drives 215km east and then 45km north. What is the magnitude of the cars displacement? Round you answer to nearest whole n

kifflom [539]

Answer: $219.65\ \text{km}$

Explanation:

Given

Car drives 215 km east and then 45 km North

Displacement is East direction is

$\Rightarrow \vec{r_1}=215\hat{i}$

Now, the displacement from that to 45 km North is given by

$\Rightarrow \vec{r_{21}}=45\hat{j}$

Net displacement is $\vec{r_2}$

$\Rightarrow \vec{r_2}=\vec{r_1}+\vec{r_{21}}\\\Rightarrow \vec{r_2}=215\hat{i}+45\hat{j}$

Magnitude of the displacement is

$\Rightarrow \left | r_{2} \right |=\sqrt{\left ( 215 \right )^2+\left ( 45 \right )^2}\\\Rightarrow \left | r_{2} \right |=\sqrt{48250}\\\Rightarrow \left | r_{2} \right |=219.65\ \text{km}$

5 0

3 years ago

How to find the specific heat capacity for a liquid

bazaltina [42]

Answer:

Heat Capacity = E / T.

- Find the difference in temperature for changes of multiple degrees.

- Add the appropriate units to your answer to give it meaning.

- Know that this equation works for cooling objects as well.

- Know that specific heat refers to the energy needed to raise one gram by one degree.

5 0

3 years ago

If the mean velocity adjacent to the top of a wing of 1.8 m chord is 40 m/s and that adjacent to the bottom of the wing is 31 m/

Cloud [144]

Answer:

lift per meter of span = 702 N/m

Explanation:

See attached pictures.

7 0

4 years ago