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Answer:

Here's an explanation but not the answer

Explanation:

When a resistor is traversed in the same direction as the current, the ... Traversing the internal resistance r1 from c to d gives −I2r1. ... I1 = I2 + I3 = (6−2I1) + (22.5− 3I1) = 28.5 − 5I1.

Answer:

I HOPE THIS IS CORRECT

Explanation:

It is heated from 20°C to 80°C. We need to find the heat absorbed. It can be given by the formula as follows : So, 1386 J of heat is absorbed.

Answer:

1/2 m v^2 = m g H      conservation of energy

H = (v^2 / (2 * g))^1/2 = (14^2 / 19.6)^1/2 = 10 m

H = 1/2 g t^2       time to fall 10 m

t = (2 * H / g)^1/2 = (20 / 9.8)^1/2 = 1.43 sec

Total time in air = 2 * 1.43 = 2.86

You can also use 2 a S = V0^2 since final velocity = 1.43 * 9.8 m/s = 14 m / s

and 2 a S = 2 * 9.8 * 10 = 196 m^2 / s^2   which is V0 squared

Answer:

Acceleration is the rate of change in velocity. Momentum is the mass times the velocity. So if you multiply the mass times the acceleration, you get the of change of momentum.

Answer:

Answer:

[tex]B_2=2.1nT[/tex]

Explanation:

From the question we are told that:

Frequency [tex]F=800kHz[/tex]

Distance [tex]d=4.5km[/tex]

Electric field amplitude [tex]B_2=0.63V/m[/tex]

Generally the equation for momentum is mathematically given by

 [tex]B=\frac{E}{C}[/tex]

Therefore

 [tex]B_2=\frac{0.63}{3*10^8}[/tex]

 [tex]B_2=0.21*10^{-8}[/tex]

 [tex]B_2=2.1nT[/tex]

Answer:

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Explanation:

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Given :

Initial velocity , u = 0 m/s² .

To Find :

The acceleration of the cart.

Solution :

Since, acceleration is constant.

Using equation of motion :

[tex]x = ut + \dfrac{at^2}{2}\\\\x = \dfrac{at^2}{2}[/tex]

Putting, t = 1 s  and x = 4 m in above equation, we get :

[tex]4 = \dfrac{a(1)^2}{2}\\\\a = 8 \ m/s^2[/tex]

Therefore, the acceleration of the cart is 8 m/s².

Explanation:

hmm! very good questions I hope u understand

3.7e-1437 Gigagram

BRAINILIEST PLEASE

Answer:

378 KWh

Explanation:

We'll begin by converting 1.2×10³ W to KW. This can be obtained as follow:

10³ W = 1 KW

Therefore,

1.2×10³ W = 1.2×10³ W × 1 KW / 10³ W

1.2×10³ W = 1.2 KW

Next, we shall convert 6.3×10² mins to hours (h). This can be obtained as follow:

60 mins = 1 h

Therefore,

6.3×10² mins = 6.3×10² mins × 1 h / 60 mins

6.3×10² mins = 10.5 h

Finally, we shall determine the electrical energy in KWh used for 1 month (i.e 30 days). This can be obtained as follow:

Power (P) = 1.2 KW

Time (t) for 1 month (30 days) = 10.5 h × 30

= 315 h

Energy (E) =?

E = Pt

E = 1.2 × 315

E = 378 KWh

Thus, the electrical energy used for 1 month (i.e 30 days) is 378 KWh.

Answer:

[tex] \large{ \tt{❃ \: a = \frac{v - u}{t}}} [/tex]

[tex] \large{ \tt{ \dashrightarrow \: at = v - u}}[/tex]

[tex] \large{ \tt{∴ \: v = u + at - - - \tt{ {1}^{st} EQUATION \: OF \: MOTION}}}[/tex]

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Answer:

Climate change means a change in the state of the climate system that is sustained over a long period of time. These types of changes can occur due to natural or human causes.

Climate change and its effects on the planet can generate massive migrations, given the affectation of nature in certain parts of the planet.

Thus, an example would be the migration of populations from island countries, such as Fiji, Tonga or Samoa, to continental territories, due to the rise in sea level caused by the melting of the poles due to global warming.

Another example may be the desertification of certain regions, which would encourage migration by the inhabitants of these places to other territories.

Finally, climate change and its negative effects not only generate massive migrations caused by natural effects, but also by the economic effects of said changes, that is, by increases in poverty and inequality in the face of the scarcity of certain natural resources.

Answer:

50 km/h

Explanation:

From the graph, we can deduce the following parameters;

Distance = 20, 40, 60, 80, 100 km

Time = 0.5, 1.0, 1.5, 2.0 hours

To find the average velocity of the car over the first 2.00 hours.

First of all, we would determine the total distance and time.

Total distance = 20 + 40 + 60 + 80 + 100 = 300 km

Total time = 0.5 + 1.0 + 1.5 + 2.0 = 5

Average velocity = distance/time

Average velocity = 100/2

Average velocity = 50 km/h

Answer:

219 m/s

Explanation:

Kinetic energy is calculated using the formula:

Given:

We can solve for the unknown variable v.

Substitute these known values into the formula.

The velocity of the car is around 219 m/s.

Answer:

The answer is Option no. C because rapid changes can cause both magnetic field and stronger electric field

Answer:

From 0.75 to 1.25 hours

Explanation:

Given

See attachment for graph

Required

Point where they didn't move

This means that we identify the point where the distance didn't change.

Given that the distance is plotted on the y-axis, we simply check for the end points of any horizontal line on the graph

The horizontal line on the graph represents 30km and the time interval is: 0.75 to 1.25 hours.

Hence, (c)  is correct

Answer:

ON

Explanation:

Locate your computer's Power button.

Press and hold that button until your computer shuts down.

Wait until you hear the computer's fans shut off, and your screen goes completely black.

Wait a few seconds before pressing and holding the power button to initiate your computer's normal startup.

Explanation:

Adaptations are any behavioral or physical characteristics of an animal that help it to survive in its environment

Answer:

 x₃ = 0.0725 m

Explanation:

The force between the particles is electrical

          F = [tex]k \frac{q_1q_2}{r_{12}^2}[/tex]

          F = q₀ E_total

don q₀ is a positive test charge at the point of interest, therefore we can calculate the electric field at the point of interest x₀ = 0.25 cm

          F = 0   → E_total = 0

          E_total = E₁ + E₂ + E₃

           E_total = [tex]k \frac{q_1}{r_{1o}^2} + k \frac{q_2}{r_{2o}^2} + k \frac{q_3}{r_{3o}^2}[/tex]

          E_total = k ( [tex]\frac{q_1}{r_{1o}^2} + \frac{q_2}{r_{2o}^2} + \frac{q_3}{r_{3o}^2}[/tex] )

let's look for the distances

          r₁₀ = (x₀ - 0)

          r₁₀ = 0.25 m

          r₂₀ = √(x₀ - x₂) ²

          r₂₀ = √ (0.25 - 0.15) ²

          r₂₀ = 0.10 m

          r₃₀ = √ (0.25 - x₃) ²

we substitute

           0 = 9 10⁹ (4 / 0.25² - 2.1 / 0.1² + 4.6 / (0.25-x₃)² )

            4.6 / (0.25-x3)² = -4 / 0.25² + 2.1 / 0.1²

             4.6 / (0.25-x3) ² = -146

             (0.25 - x3) ² = - 4.6 / 146 = - 0.0315068

              0.25 - x3 = 0.1775

              x₃ = 0.25 - 0.1775

              x₃ = 0.0725 m

Answer:

Appliance A and B can work together without tripping

Explanation:

We will calculate the amount of current consumed by each appliances.

Appliance A

P = VI

I = P/V  

I = 250/120 = 2.08 A

Appliance B

I = 480 /120 = 4 A

Appliance C

I = 1450/120

I = 12.08 A

Hence, appliance C will trip the circuit as it consumes a lot of electricity.

The book is lifted upward, but gravity points down, so the work done by gravity must be negative (so you can eliminate options 1 and 3).

The force exerted on the book by gravity has magnitude

F = mg = (10 N) (9.80 m/s^2) = 9.8 N ≈ 10 N

You raise the book 1.0 m in the opposite direction, so the work done is

W = (10 N) (-1.0 m) = -10 J

The work done by gravity on the book is -10 Joules. The correct option is 2.

The force of attraction felt by a person at the center of a planet or Earth is called as the gravity.

Given are the three positions. The Earth has the acceleration due to gravity, g =  9.81 m/s²,

The book is lifted upward, but gravity points down, so the work done by gravity must be negative (so you can eliminate options 1 and 3).

The force exerted on the book by gravity has magnitude

F = mg = 10 N x( -9.80 m/s² )= -9.8 N

F ≈ -10 N

The book is raised by  1.0 m in the opposite direction, so the work done is

W =- 10 N x 1.0 m = -10 J

Thus, the correct option is 2.

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.

The answer is in the photo. Hope you are satisfied.Have a nice day ☺️

To solve this we must be knowing each and every concept related to  acceleration due to gravity and its calculation. Therefore, the value of 'g' on the surface of Jupiter is 25.8m/s².

What is acceleration due to gravity?

Gravitational acceleration is indeed a vector, which implies it has a direction and a magnitude. The acceleration caused by gravity at the Earth's surface is denoted by the symbol g. It possesses a standard value of 9.80665 m/s².

Mathematically, the formula for acceleration due to gravity can be given as

g = G M /R²

G=6.674 x 10⁻¹¹ m³ kg⁻¹s⁻²

Mass of Jupiter=319×mass of earth

Radius of Jupiter=11×radius of earth

substituting all the given values in the above equation, we get

g = 6.674 x 10⁻¹¹× 319×6×10²⁴ /(11×6378 10³)²

On calculations, we get

g=25.8m/s²

Therefore, the value of 'g' on the surface of Jupiter is 25.8m/s².

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Answer:

the current through the circuit is 10 A.

Explanation:

Given;

voltage of the battery, V = 10 V

number of the parallel resistors, = 3

resistance of each resistor, r = 3 ohms

The equivalent resistance is calculated as;

[tex]\frac{1}{R_t} = \frac{1}{r_1}+ \frac{1}{r_2} + \frac{1}{r_3} \\\\\frac{1}{R_t} = \frac{1}{3}+ \frac{1}{3} + \frac{1}{3}\\\\\frac{1}{R_t} =\frac{3}{3} \\\\\frac{1}{R_t} = 1\\\\R_t = 1 \ ohms[/tex]

The current through the circuit is calculated as;

V = IRt

I = V/Rt

I = 10/1

I = 10 A

Therefore, the current through the circuit is 10 A.

Answer:

ans: 1750 kg

Explanation:

F = ma

so ,

m = F/a

= 3500 / 2

= 1750 kg

Answer:

v = 1.26 m/s

Explanation:

Given that,

The radius of the circle, r = 20 cm = 0.2 m

The centripetal acceleration of the object, a = 8 m/s²

We need to find the tangential velocity of the object. We know that the formula for the centripetal acceleration is given by :

[tex]a=\dfrac{v^2}{r}\\\\v=\sqrt{ar}\\\\v=\sqrt{8\times 0.2}\\\\v=1.26\ m/s[/tex]

So, the tangential velocity of the object will be 1.26 m/s.

Explanation:

A nichrome (ρ = 100x10-8 Ωm) wire has a diameter of 0.40 mm. ... A power line with a resistance of 2 ohms has a current of 80 A in it

1/8 Watt 50 kΩ resistor has 70 V applied.

A 50 Ω resistor in a circuit has a current flowing through it of 2.0 A then the power dissipated by the resistor is 200 Watt. Therefore the correct option is B.

The rate of doing work is known as power. The Si unit of power is the watt.

Power =work/time

The mathematical expression for the power is as follows

P = VI

where P is the power

V is the voltage

I is  current passing through the circuit

The expression of power can be represented in many different forms by using the ohms law

As we know from Ohm's law that V= IR

Power = VI

by substituting V=IR in place of the voltage in power formula

P = I²R

As given in the problem a 50 Ω resistor in a circuit has a current flowing through it of 2.0 A so by substituting the values of the current and the resistance in the formula of power

P = 2²×50

  = 200 Watt

Therefore the correct answer is B.

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Answer:

a) P = 70054.3 W,  b)  P = 18820 W,  c)   P = 14116.7 W

Explanation:

Power is defined as work per unit of time

         P = W / t = F x / t

         P = F v

a) in this case the velocity is constant, let's use the equilibrium relation to find the force.

Let's set a reference system with the x axis parallel to the plane

        F - Wₓ = 0

         F = Wₓ

with trigonometry let's decompose the weight

        sin θ = Wₓ / W

        Wₓ = W sin θ

          F = W sin 15

          F = 2800 sin 15

          F = 724.7 lb

we look for the speed, as it rises with constant speed we can use the relations of uniform motion

          v = x / t

          v = 1160/12

          v = 96.67 ft / s

we calculate the power

          P = 724.7 96.67

          P = 70054.3 W

b) In this case, the speed of the vehicle changes during the ascent, so we use the relationship between work and the change in kinetic energy

           W = ΔK

           W = ½ m v_f² - ½ m v₀²

   let's reduce to the SI system

           v₀ = 10 mph (5280 ft / 1 mile) (1h / 3600 s = 14.67 ft / s

           v_f = 50 mph (5280 ft / 1 mile) (1 h / 3600s) = 73.33 ft.s

 mass :         m = w / g

           W = ½ 2800/32 (73.33² - 14.67²)

           W = 225841 J

we calculate the average power

           P = W / t

           P = 225841/12

           P = 18820 W

c) we repeat the previous procedure

          v₀ = 45 mph = 66 ft / s

          v_f = 15 mph = 22 ft / s

          W = ½ 2800/32 (22² - 66²)

          W = -169400 J

          P = W / t

          P = 169400/12

          P = 14116.7 W

Answer:

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