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Evgesh-ka [11]
3 years ago
7

A powered winch is used to pull a sailboat to shore. The winch uses a 900 W motor. If the motor is used for 30 s, how much work

does it do? (Power: P = W/t)
Physics
2 answers:
Mamont248 [21]3 years ago
5 0

Answer: 27,000 J

Explanation:

kolbaska11 [484]3 years ago
4 0

Answer:

they have given us

power = 900W

time = 30s

p =  \frac{wd}{t}  \\ p \times t = wd \\ 900 \times 30 = w.d \\ 27000j

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A housefly walking across a clean surface can accumulate a significant positive or negative charge. In one experiment, the large
nalin [4]

Answer:

1681714.28571 N/C

Yes it could exist

Explanation:

m = Mass of housefly = 12 m

q = Charge = 70 pC

g = Acceleration due to gravity = 9.81 m/s²

E = Electric field

When an object accumulates charge it means that it is gaining electrons making it negatively charged. This is the concept of static electricity.

Here, the electric force and the graviational force will balance each other

F_e=W\\\Rightarrow qE=mg\\\Rightarrow E=\frac{mg}{q}\\\Rightarrow E=\frac{12\times 10^{-6}\times 9.81}{70\times 10^{-12}}\\\Rightarrow E=1681714.28571\ N/C

1681714.28571 N/C of electric field would be required to levitate

The direction of the electric field would be upwards vertically.

In air the critical value of electric field is 3\times 10^6\ N/C which is more than the critical value of electric field in air. So, the electric field can exist.

5 0
3 years ago
A narrow beam of light containing orange (610 nm) and blue (470 nm) wavelengths goes from polystyrene to air, striking the surfa
Eva8 [605]

Answer: The angle between the two colours when they emerge is 0.4°

Explanation:

The refracting angle for different colors knowing its refractive index can be calculated using Snell's law.

Ni × sin α = Nr × sinβ

Where Ni is the refractive index for light in incident medium

α is the angle the incident makes with normal

Nr is the refractive index for light in the refractive medium

β is the angle the refracted makes with the normal

Making β the subject

β = arcSin ( Ni × sinα)/Nr

For Orange color

The value of refractive index in polystyrene medium is 1.490 ,that is Ni= 1.490

α is 30° and Nr is the refractive index of air = 1

β = arcSin(1.490×sin30°)/1

β= 48.15°

For Blue color

The value of refractive index in polystyrene medium is 1.499,that is Ni= 1.499

α is 30° and Nr is the refractive index of air = 1

β = arcSin(1.499×sin30°)/1

β= 48.55°

The angle between the two colours is the difference in the angles of their refracted rays

48.55-48.15=0.4°

6 0
3 years ago
The gravity of Earth is attracting a person towards the center with 500N of gravitational force. The person is exerting a reacti
slavikrds [6]

Answer:

The force is being pulled my the gravity or it could be a third party thing like a black hole you feel me

Explanation:

8 0
3 years ago
Which of the following causes tornados A. Dry climates B.Sationary fronts B. Condensation D. Wind shear
natta225 [31]
The answer is wind shear (D)
8 0
4 years ago
An electron moves 4.5 m in the direction of an electric field of strength 325 N/C. What is the change in electrical potential en
Vinvika [58]
Calculate q* E * d 
<span>Put q = 1.6 x 10^-19 </span>
<span>E = 325 </span>
<span>d = 4.5 


I hope this helps!</span>
6 0
4 years ago
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