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Anon25 [30]
3 years ago
9

Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of

its brightness. You add a second lightbulb, connecting it in parallel with the previous lightbulbs, again take note of the brightness. Repeat the process with the third lightbulb, connecting it in parallel with the other two. As the lightbulbs are added, how are the following properties affected? (Neglect the battery's internal resistance)
brightness of the bulb ---Select--- increases decreases remains unchanged
individual currents in the bulb ---Select--- increases decreases remains unchanged
power delivered by the battery ---Select--- increases decreases remains unchanged
lifetime of the battery ---Select--- increases decreases remains unchanged
Physics
1 answer:
Alex17521 [72]3 years ago
7 0

Answer:

Explanation:

Brightness of the bulb remains the same .

It is so because as lightbulb is added in parallel combination , the potential over each bulb remains same . Resistance is also same so according to the following formula for power , heat generated will be same .

Power = V² / R

On the same principle , current also remains the same .

Current = V / R , V and R are same for all .

Power of the battery

= V² / R where R is resistance of the circuit . As the bulb is added in parallel , total resistance of circuit decreases , hence power increases .

Power by battery increases .

As power increases , lifetime decreases because energy is  dissipated

by battery at greater speed.  

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Rzqust [24]

Answer:

gravity pulled in clouds of dust and gas. which is sometimes referred to as a nebula.

Explanation:

7 0
4 years ago
Which health related fitness component is tested in the curl-up test
Aleksandr-060686 [28]

Answer:

Curl up test.

Explanation:

The curl up test is done to check the strength of the abdomen muscles and the stability of the core muscles. The strength of the core muscles determines the stability of the body.

The curl up test is done to test the abdomen strength and endurance and the strength of the back muscles.

The test requires the following materials: A flat cushioned surface(clean) and a measuring strip

  • The measuring strip is placed on the mat under the students legs so that their fingertips are just resting on the nearest edge of the measuring strip. The feet cannot be held or rest against an object. Keeping heels in contact with the mat, the student curls up slowly, sliding their fingers across the measuring strip until the fingertips reach the other side, then curls back down until their head touches the mat. There should be 20 curl-ups per minute
8 0
3 years ago
Anne has a sample of a substance. Its volume is 20 cm3, and its mass is 100 grams. What is the sample’s density?
AveGali [126]

Answer:

density = 5000 [kg/m^3]

Explanation:

Density is defined as the relationship between mass and volume.

Now we have:

m = 100 [gr] = 0.1[kg]

V = volume = 20[cm^3]

20[cm^{3}]*1[\frac{m^{3} }{100^{3} cm^{3} } ] = 2*10^{-5}[m^{3} ]

density = 0.1 / (2 x 10^-5)

density = 5000 [kg/m^3]

7 0
4 years ago
The table shows the mass of and acceleration due to gravity for several
Natalka [10]

Answer:

i dont know what u meant by 50m, maybe N but what i got is 5

6 0
3 years ago
(pleases show work)
Feliz [49]

a. 46 m/s east

The jet here is moving with a uniform accelerated motion, so we can use the following suvat equation to find its velocity:

v=u+at

where

v is the velocity calculated at time t

u is the initial velocity

a is the acceleration

The jet in the problem has, taking east as positive direction:

u = +16 m/s  is the initial velocity

a=+3 m/s^2  is the acceleration

Substituting t = 10 s, we find the final velocity of the jet:

v=16 + (3)(10)=46 m/s

And since the result is positive, the direction is east.

b. 310 m

The displacement of the jet can be found using another suvat equation

s=ut+\frac{1}{2}at^2

where

s is the displacement

u is the initial velocity

a is the acceleration

t is the time

For the jet in this problem,

u = +16 m/s  is the initial velocity

a=+3 m/s^2  is the acceleration

t = 10 s is the time

Substituting into the equation,

s=(16)(10)+\frac{1}{2}(3)(10)^2=310 m

4 0
3 years ago
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