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dolphi86 [110]
4 years ago
7

WILL GIVE BRAINLIEST AND 30 POINTS!

Physics
1 answer:
Snezhnost [94]4 years ago
5 0

Answer:

1. B. Increase

2. A. Decrease

Explanation:

To understand this issue, we need to put some values and using the ohm's law we can corroborate the two situations.

Ohm's law:

V = I*R\\where:\\I = current[A] ampers\\R = resistance [ohms]\\V = voltage [volts]\\

Now for the voltage we will use V = 110 [V], for resistance R = 10 [ohms]

Replacing the values we have:

I = \frac{V}{R} \\\\I = \frac{110}{10}\\I= 11 [amp]

Now let's double the voltage 220 [V]:

I = \frac{220}{10} \\I = 22 [amp]\\

Therefore the current will be increased.

Let's do the same for the resistance if originally we have R = 10 [ohms]

I = \frac{V}{R}\\I = \frac{110}{10} \\I = 11 [amp]\\

Now let's double the resistance 20 [ohms]:

I=\frac{110}{20}\\I = 5.5 [amp]

Therefore the current will be decreased.

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An astronaut holds a rock 100m above the surface of Planet X . The rock is then thrown upward with a speed of 15m/s , as shown i
Butoxors [25]

Answer:5 m/s^{2}

Explanation:

The described situation is is related to vertical motion (and free fall). So, we can use the following equation that models what happens with this rock:

y=y_{o}+V_{o}sin\theta t-\frac{1}{2}gt^{2} (1)

Where:

y=0m is the rock's final height

y_{o}=100 m is the rock's initial height

V_{o}=15 m/s is the rock's initial velocity

\theta=90\° is the angle at which the rock was thrown (directly upwards)

t=10 s is the time

g is the acceleration due gravity in Planet X

Then, isolating g and taking into account sin(90\°)=1:

g=(-\frac{2}{t^{2}})(y-y_{o}-V_{o}t) (2)

g=(-\frac{2}{(10 s)^{2}})(0 m-100 m-(15 m/s)(10 s)) (3)

Finally:

g=5 m/s^{2} (4) This is the acceleration due gravity in Planet X

7 0
3 years ago
Calculate the critical angle for Zircon which has a refractive index of n = 2*
MA_775_DIABLO [31]

Answer:

Given that refractive index of the material is √2. i.e. n = √2. Hence, critical angle for the material is 45°

8 0
4 years ago
Do horses fly? tell me please because these people be tripping
8090 [49]

Answer:

No

Explanation:

Unless they're a Pegasus, then no, regular horses DO NOT fly.

8 0
4 years ago
Read 2 more answers
A supersonic nozzle is also a convergent–divergent duct, which is fed by a large reservoir at the inlet to the nozzle. In the re
Lady_Fox [76]

Answer:

155.38424 K

2.2721 kg/m³

Explanation:

P_1 = Pressure at reservoir = 10 atm

T_1 = Temperature at reservoir = 300 K

P_2 = Pressure at exit = 1 atm

T_2 = Temperature at exit

R_s = Mass-specific gas constant = 287 J/kgK

\gamma = Specific heat ratio = 1.4 for air

For isentropic flow

\frac{T_2}{T_1}=\frac{P_2}{P_1}^{\frac{\gamma-1}{\gamma}}\\\Rightarrow T_2=T_1\times \frac{P_2}{P_1}^{\frac{\gamma-1}{\gamma}}\\\Rightarrow T_2=00\times \left(\frac{1}{10}\right)^{\frac{1.4-1}{1.4}}\\\Rightarrow T_2=155.38424\ K

The temperature of the flow at the exit is 155.38424 K

From the ideal equation density is given by

\rho_2=\frac{P_2}{R_sT_2}\\\Rightarrow \rho=\frac{1\times 101325}{287\times 155.38424}\\\Rightarrow \rho=2.2721\ kg/m^3

The density of the flow at the exit is 2.2721 kg/m³

4 0
3 years ago
What is the acceleration of a 1200 kg car when a force of 4200 N is applied?
goldenfox [79]
Force=mass* acceleration
Therefore
4200=1200* acc.
Acceleration =4200/1200
Therefore acc.=3.5
(* this sign indicates multiply)
6 0
3 years ago
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