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Galina-37 [17]
3 years ago
13

In the circuit diagram, what does the symbol made of two Long lines and two short lines with a positive and a negative sign at e

ach end represents?
A) A source of electrical energy

B) An electrical conductor

C) an electrical resistor

D) A closed switch

PLEASE ASAP. WILL GIVE BRAINLIST AND 20 POINTS

Physics
1 answer:
Licemer1 [7]3 years ago
8 0
That symbol represents a source of DC, usually a battery.

The zig-zag line represents a resistor, and the two little circles
connected by a short line represent a switch in the closed position.,
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a solid sphere is rolling without slipping along a horizontal surface with a speed of 5.5 meters per second when it starts up a
iVinArrow [24]

Answer:

3.53 m/s

Explanation:

KE₁ + RE₁ = KE₂ + RE₂ + PE

½ mv₁² + ½ Iω₁² = ½ mv₂² + ½ Iω₂² + mgh

For a solid sphere, I = ⅖ mr²

½ mv₁² + ½ (⅖ mr²) ω₁² = ½ mv₂² + ½ (⅖ mr²) ω₂² + mgh

½ mv₁² + ⅕ mr² ω₁² = ½ mv₂² + ⅕ mr² ω₂² + mgh

Rolling without slipping means v = ωr.

½ mv₁² + ⅕ mv₁² = ½ mv₂² + ⅕ mv₂² + mgh

⁷/₁₀ mv₁² = ⁷/₁₀ mv₂² + mgh

⁷/₁₀ v₁² = ⁷/₁₀ v₂² + gh

Substitute:

⁷/₁₀ (5.50 m/s)² = ⁷/₁₀ v₂² + (9.8 m/s²) (3.00 m sin 25.0°)

v₂ = 3.53 m/s

8 0
3 years ago
Give details of aids in brief and explain how to protect yourself and prevent.
tamaranim1 [39]

Answer:

(AIDS) is a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV). By damaging your immune system, HIV interferes with your body's ability to fight infection and disease. HIV is a sexually transmitted infection (STI). It can also be spread by contact with infected blood or from mother to child during pregnancy, childbirth or breast-feeding.

Explanation:

To help prevent the spread of HIV: 1. Use treatment as prevention (TasP). If you're living with HIV, taking HIV medication can keep your partner from becoming infected with the virus.

8 0
3 years ago
-Para lograr que una pieza de 0,300 kg de cierto metal aumente su temperatura desde 40°C a 60 °C ha sido necesario suministrarle
marishachu [46]

Answer:

parte a) el calor específico es c = 0.383 J /(gr*K)

parte b) la temperatura inicial es T inicial= 52.72 °C

Explanation:

para el primer punto la formula para el calor Q es:

Q = m * c * ( T final - T inicial )

donde

m= masa de la pieza = 0.300 kg = 300 gr

Q = flujo de energía en forma de calor= 2299 J

c = calor específico

T final = temperatura final =40°C

T inicial = temperatura inicial = 60 °C

entonces

Q = m * c * ( T final - T inicial )

c = Q / [ m* ( T final - T inicial ) = 2299 J/[ 300 gr  * ( 60 °C - 40°C )]

= 0.383 J /(gr*K)

c = 0.383 J /(gr*K)

para el segundo punto usamos la misma formula

Q = m * c * ( T final - T inicial )

pero

m= 200 gr= 0.200 kg

c=459.8 J/(kg*K) , Q =20.900 J , T final = 280 °C

Q = m * c * ( T final - T inicial )

T inicial = T final - Q/(m*c)  =280 °C - 20.900 J/(459.8 J/(kg*K)* 0.200 kg) = 52.72 °C

7 0
4 years ago
You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between
Klio2033 [76]

Answer:

a) u=0.05602\ m.s^{-1}

b) u'=0.0169\ m.s^{-1}

Explanation:

Given:

mass of the ball, m=0.4\ kg

horizontal velocity of the ball, u=10\ m.s^{-1}

mass of the person, M=71\ kg

a)

<u>Using the law of  conservation of momentum:</u>

m.v=(M+m).u

0.4\times 10=(71+0.4)\times u

u=0.05602\ m.s^{-1}

b)

Given:

  • rebound velocity of the ball, v'=7\ m.s^{-1}

Using conservation of momentum,

m.v+M.u=m.v'+M.u'

0.4\times10+71\times 0=0.4\times 7+71\times u'

u'=0.0169\ m.s^{-1}

4 0
3 years ago
Read 2 more answers
The end of a garden hose is enclosed in a mesh sphere of radius 4 cm. If the hose delivers five liters per minute, how much wate
lana [24]

Answer

0.001339 liter

Explanation:

It is given that radius = 4 cm =0.04 m

volume of sphere V=\frac{4}{3}\pi R^{3}

V=\frac{4}{3}\times 3.14\times (4\times 10^{-2})^{3}=2.674\times 10^{-4}

It is given that hose delivers five liters per minute

So the water flows through sphere per minute is given by 5×2.674×10^{-4}=0.001339 liters

6 0
3 years ago
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