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3 years ago

Consider three different resistors connected to a battery in parallel.

Physics

1 answer:

zhuklara [117]3 years ago

5 0

Answer:

c) All choices listed are definitely true.

Explanation:

As they are connected in parallel, the voltage drop is equal in all the resistors, by definition of a parallel connection, and equal to the terminal voltage of the battery (assuming that the internal resistance of the battery is negligible).

Applying Ohm's law to the circuit, we arrive to the following expression:

$I_{tot} = I_{1} +I_{2} + I_{3} \\ I_{tot} =\frac{V}{Req} = \frac{V}{R_{1}} +\frac{V}{R_{2} } +\frac{V}{R_{3}}$

Simplifying common terms, we have:

$\frac{1}{Req} = \frac{1}{R_{1}} +\frac{1}{R_{2} } +\frac{1}{R_{3}}$

It can be seen that the equivalent resistance, is less than any of the resistances.

Due to the charge conservation principle, as the current is made from moving charges, the sum of the currents passing through these resistors is equal to the current passing through the battery (KCL).

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If this speed is based on what would be safe in wet weather, estimate the radius of curvature for a curve marked 70 km/h . The c

olganol [36]

as it is given that curved marked the speed as v = 70 km/h

so we will first convert the speed into m/s

$v = 70 km/h = 19.44 m/s$

now we know that here friction force will provide centripetal force

$F_c = F_f$

As we know that centripetal force is given as

$F_c = \frac{mv^2}{R}$

$\frac{mv^2}{R} = \mu_k mg$

$\frac{v^2}{R} = \mu_k g$

$v^2 = \mu_k R * g$

$19.44^2 = 0.5* R * 9.8$

$378 = 4.9 * R$

$R = 77.1 m$

3 0

4 years ago

Read 2 more answers

A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket

NARA [144]

The constant acceleration of a rocket launched upward, calculated knowing that the time it takes for a bolt that falls off the side of the rocker was 6.30 seconds, is 5.68 m/s².

When the rocket is launched straight up with constant acceleration, the acceleration of the rocket is given by:

$v_{f_{r}} = v_{i_{r}} + at$

Where:

$v_{f_{r}}$ : is the final velocity of the rocket

$v_{i_{r}}$ : is the initial velocity of the rocket = 0

a: is the acceleration

t: is the time

After 4 seconds, the final speed of the rocket will be the initial speed of the bolt, so:

$v_{f_{r}} = v_{i_{b}} = at = 4a$

When the bolt falls off the side of the rocket, the bolt hits the ground 6.30 seconds later.

The initial height of the bolt will be the final height of the rocket, and vice-versa. With this, we can take the final height of the bolt as zero.

$y_{f_{b}} = y_{i_{b}} + v_{i_{b}}t - \frac{1}{2}gt^{2}$

$0 = y_{i_{b}} + v_{i_{b}}t - \frac{1}{2}gt^{2}$

$y_{i_{b}} = \frac{1}{2}9.81*(6.30)^{2} - 4a*6.30 = 194.7 - 25.2a$

Now, as we said above, this height (of the bolt) will be the final height of the rocket, so:

$y_{f_{r}} = y_{i_{r}} + v_{i_{r}}t - \frac{1}{2}gt^{2}$

$194.7 - 25.2a = 0 + 0 - \frac{1}{2}a(4)^{2}$

$a = \frac{194.7}{33.2} = 5.86 m/s^{2}$

Therefore, the acceleration of the rocket is 5.68 m/s².

You can find another example of acceleration calculation here: brainly.com/question/24589208?referrer=searchResults

I hope it helps you!

3 0

3 years ago

Solids in which the atoms have no particular order or pattern are called

posledela

Answer:

Amorphous solids are composed of atoms or molecules that are in no particular order. Each particle is in a particular spot, but the particles are in no organized pattern. Examples include rubber and wax. Crystalline solids have a very orderly, three-dimensional arrangement of atoms or molecules

Explanation:

8 0

3 years ago

the force required to lift a load of 800 Newton by using a Lever having a mechanical advantage of 1.6 is

Anna007 [38]

Answer:force required to lift the load = 500N

Explanation:

Mechanical advantage for a lever is given by the formulae

= force output/force input

Mechanical Advantage = Load / Effort

where

Force output / Load= 800 N

mechanical advantage = 1.6

Force input / Effort =??

Force input= Force output /Mechanical advantage

= 800N / 1.6

=500N

Effort = Load/ Mechanical Advantage = 800/ 1.6 = 500N

6 0

3 years ago

An electromagnetic wave of wavelength

Ivanshal [37]

Answer:

$4.01\cdot 10^{-7} m$

Explanation:

When an electromagnetic wave passes through the interface between two mediums, it undergoes refraction, which means that it bents and its speed and its wavelength change.

In particular, the wavelength of an electromagnetic wave in a certain medium is related to the index of refraction of the medium by:

$\lambda=\frac{\lambda_0}{n}$