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Misha Larkins [42]
3 years ago
10

A hop is a springing from one foot but landing on the other foot? Question 4 options: True False

Physics
2 answers:
Kay [80]3 years ago
7 0

Answer:

False

Explanation:

You're either landing on the same foot, Both feet, Or the other...

Rama09 [41]3 years ago
6 0

Answer:

i thinc it's False

Explanation:

sorry im 6

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A single-story retail store wishes to supply all its lighting requirement with batteries charged by photovoltaic cells. The PV c
Umnica [9.8K]

Answer:

83.33% of the roof area will be occupied by the PV cells

Explanation:

Given the data in the question;

time-averaged lighting requirement P_{lighting = 10 W/m²

the annual average solar irradiance q_{solar = 150 W/m²

the PV efficiency η_{pv = 10% = 0.1

battery charging/discharging efficiency η_{battery = 80% = 0.8

we know that; Annual average power to the light = P_{lighting × A_{roof

Now, the electrical power delivered by the solar cell battery system will be;

⇒  q_{solar × A_{pv × η_{pv × η_{battery

P_{lightingA_{roof = q_{solar × A_{pv × η_{pv × η_{battery

Such that;

A_{pv = P_{lightingA_{roof / q_{solar × A_{pv × η_{pv × η_{battery

A_{pv / A_{roof = P_{lighting /  q_{solar × η_{pv × η_{battery

so we substitute

A_{pv / A_{roof = 10 W/m² / [ 150 W/m² × 0.1 × 0.8 ]

A_{pv / A_{roof = 10 W/m² / 12 W/m²

A_{pv / A_{roof = 0.8333

A_{pv / A_{roof = (0.8333 × 100)%

A_{pv / A_{roof = 83.33%

Therefore, 83.33% of the roof area will be occupied by the PV cells.

7 0
3 years ago
If an astronaut throws an object in space, the object's speed will _____________. A) decrease. B) increase. C) remain constant.
GenaCL600 [577]

The object's speed will remain constant after the it leaves his hand.

So will HIS speed in the opposite direction.

7 0
3 years ago
Read 2 more answers
Will get Brainlest 5 star and heart looking for someone who knows 7 grd science flvs work dm and friend
Makovka662 [10]
ANSWER:
C

EXPLANTION:
The earths crust is the toppest layer of Earth, so that elimates option A and B.

FUN FACT:
Earth is Mostly Iron, Oxygen and Silicon

I’m so sorry if this is wrong, but I hoped help.
Have a nice day :3
3 0
3 years ago
_______is the product of a force and the time during which the force acts
saul85 [17]

Answer:

impulse is the product of a force and the time during which the force acts

Explanation:

i hope this will help you :)

7 0
3 years ago
Holly puts a box into the trunk of her car. Later, she drives around an unbanked curve that has a radius of 48 m. The speed of t
Troyanec [42]

Answer:

The minimum coefficient of static friction for the box on the floor of the trunk is 0.54.

Explanation:

Given that,

Radius of the unbanked curve, r = 48 m

The speed of the car on the curve, v = 16 m/s

We need to find the minimum coefficient of static friction for the box on the floor of the trunk. It can be calculated by balancing the centripetal force and the force of gravity as :

\mu mg=\dfrac{mv^2}{r}

\mu=\dfrac{v^2}{rg}

\mu=\dfrac{(16)^2}{48\times 9.8}

\mu=0.54

So, the minimum coefficient of static friction for the box on the floor of the trunk is 0.54. Hence, this is the required solution.

5 0
4 years ago
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