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Aliun [14]
3 years ago
15

A lightbulb consumed 1100J in 30 minutes. Find Power, resistance, and calculate energy in kWh

Physics
1 answer:
lisov135 [29]3 years ago
5 0

Explanation:

30 minutes is 1800 seconds.

Power = energy / time

P = 1100 J / 1800 s

P = 0.611 W

Converting the energy from J to kWh:

1100 J × (1 Ws / 1 J) × (1 kW / 1000 W) × (1 h / 3600 s) = 3.06×10⁻⁴ kWh

To find resistance, you need to be given either the voltage or the current.

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A beam of protons is directed in a straight line along the positive zz ‑direction through a region of space in which there are c
Zinaida [17]

Answer:

The magnitude is B = \frac{450}{7.9* 10^5}

The direction is  the positive x axis

Explanation:

From the question we are told that

   The  electric field is  E = 450 V/m in the negative y ‑direction

   The speed of the proton is  v= 7.9* 10^5\  m/s in the positive z direction

Generally the overall force acting on  the proton is mathematical represented as

              F_E =  q(\vec E + \vec v  * \vec B)

Now for the beam of protons to continue un-deflected along its straight-line trajectory then  F_E =0

So

          0  =  q( E (-y) + v(z)  * \vec B)

=>      E\^y = v \^ z  * \vec B

Generally from unit vector cross product vector multiplication

         \^ z  \ *  \  \^ x  =  \^  y

So the direction of  B (magnetic field must be in the positive x -axis )

So

       E\^y = v \^ z  *  B\^ x

=>     E\^y = vB ( \^ z  *  \^ x)

=>     E\^y = vB ( \^y)        

=>      E = vB  

=>      B = \frac{450}{7.9* 10^5}

=>      B =  0.0005696 \ T  

   

   

6 0
4 years ago
I will mark you brainlist!
trasher [3.6K]

Explanation:

With most of our blue planet covered by water, it's little wonder that, centuries ago, the oceans were believed to hide mysterious creatures including sea serpents and mermaids. Merfolk (mermaids and mermen) are, of course, the marine version of half-human, half-animal legends that have captured human imagination for ages. One source, the "Arabian Nights," described mermaids as having "moon faces and hair like a woman's but their hands and feet were in their bellies and they had tails like fishes."

C.J.S. Thompson, a former curator at the Royal College of Surgeons of England, notes in his book "The Mystery and Lore of Monsters" that "Traditions concerning creatures half-human and half-fish in form have existed for thousands of years, and the Babylonian deity Era or Oannes, the Fish-god ... is usually depicted as having a bearded head with a crown and a body like a man, but from the waist downwards he has the shape of a fish." Greek mythology contains stories of the god Triton, the merman messenger of the sea, and several modern religions including Hinduism and Candomble (an Afro-Brazilian belief) worship mermaid goddesses to this day.

5 0
3 years ago
If the mass of both weights is 225 gm, the first mass is located 20∘ north of east, the second mass is located 20∘ south of east
Montano1993 [528]

Answer:

The voltage is 2.114 V.

Explanation:

Given that,

Mass of both weights = 225 gm

Transducer sensitivity = 0.5 V/N

The first mass is located 20∘ north of east, the second mass is located 20∘ south of east,

We need to calculate the net equivalent force

Using formula of force

F_{3}=m_{1}g\cos\theta+m_{2}g\cos\theta

F_{3}=2mg\cos\theta

Put the value into the formula

F_{3}=2\times0.225\times10\cos20^{\circ}

F_{3}=4.228\ N

We need to calculate the voltage

Using formula of voltage

Voltage =sensitivity\times F_{3}

Put the value into the formula

Voltage=0.5\times4.228

Voltage =2.114\ V

Hence, The voltage is 2.114 V.

7 0
3 years ago
Can someone pleassssssssssse answer this
siniylev [52]
As the plane falls the parabolic path remains directly below as the plane continues to fly over. This give more of an overview. When the package falls vertical acceleration happens as there is a vertical velocity as the package falls form high above. The downwards motion of gravity acts on the package if the approximated projectile motion ignoring air resistance.
6 0
3 years ago
A small convex mirror is placed 60 cm from the pole and on the axis of a large concave mirror of radius of curvature 200 cm. The
umka2103 [35]

Answer:

Calculate 'R' of convex mirror and height of the real image

the radius of the convex mirror is 48cm

Explanation:

Distance between convex and concave mirror is =60cm

Radius of the concave mirror (R) = 200cm

For the concave mirror, u = ∞

V = {R}/{2}=100cm

The object for the convex mirror and the final image is on the pole of the concave mirror, and distance between convex and concave mirror is 60cm

u_1=60-100 =-40cm

Object will be behind the convex mirror

1/f=1/40+1/60  

f=24cms

the radius of the convex mirror is 48cm

6 0
3 years ago
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