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3 years ago

Cell phones require powerful batteries in order to work effectively. Which

Physics

1 answer:

iragen [17]3 years ago

7 0

Answer:

D. Improving their design to make it easier to recycle them when they are no longer useful.

Explanation:

Just took the test on (APEX)!!

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A person runs up 33 stairs of height 0.25 m. The person weighs 599.85 N. How much energy does it take for the person to reach th

Dafna11 [192]

Answer:

149.96J

Explanation:

Given parameters:

Number of stairs = 33

Height = 0.25m

Weight = 599.85N

Unknown:

Energy the person takes to reach the top = ?

Solution:

To solve this problem;

The energy it takes is given as:

Energy = weight x height

Energy = mass x gravity x height

Now,

Insert the given parameters and solve;

Energy = 599.85 x 0.25 = 149.96J

4 0

3 years ago

True or false cells of humans and plants are same.

timama [110]

False, we lack cell walls whereas they have cell walls.

4 0

2 years ago

A) An automobile light has a 1.0-A current when it is connected to a 12-V battery. Determine the resistance of the light.

kirill [66]

Answer:

The resistance in first case is 12 Ω, power delivered is 12 W, and potential difference is 0.01 V

Explanation:

Given:

(A)

Current $I = 1$ A

Voltage $V = 12$ V

For finding the resistance,

$V = IR$

$R = \frac{V}{I}$

$R = \frac{12}{1}$

$R =$ 12Ω

(B)

For finding power delivered,

$P = I^{2} R$

$P = (1) ^{2} \times 12$

$P = 12$ Watt

(C)

For finding the potential difference,

$V = IR$

$V = 5 \times 10^{-3} \times 2$

$V = 10 \times 10^{-3}$

$V = 0.01$ V

Therefore, the resistance in first case is 12 Ω, power delivered is 12 W, and potential difference is 0.01 V

4 0

3 years ago

Find the time t it takes the current to reach 99.999% of its maximum value. assume that r=10 ohms and l=50 millihenrys.

elixir [45]

<span>I believe time is equal to r times I which would ten times fifty which would equal 500. I confess to not be an expert on the subject but for some reason T equals R times I came into my head.</span>

6 0

3 years ago

Compare the time periodof two pendulums of length 4m and 9m

svlad2 [7]

Answer:

=2π

=3×2π

=3T

Explanation:

4 0

3 years ago