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2 years ago

3

Which circuit diagram represents voltmeter V connected correctly to measure the potential difference across resistor R2?

2 answers:

Alenkasestr [34]2 years ago

8 0

Answer: (3)

Explanation: The answer is (3). The OP posted the wrong image because the V is supposed to be in the circle (which led to the wrong answer here).

jek_recluse [69]2 years ago

5 0

The "V" should be inside of the circle on the diagram - that's why we'll exclude the option (3) where it isn't.

Also, we want to measure only R2, so we're looking for an option where R1 and R2 are separated - that's only 3 and 4..

But, since we before rejected option (3), we're left with 4 -this is the correct answer!

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A rigid container equipped with a stirring device contains 1.5 kg of motor oil. Determine the rate of specific energy increase w

jenyasd209 [6]

To solve this problem we will apply the first law of thermodynamics which details the relationship of energy conservation and the states that the system's energy has. Energy can be transformed but cannot be created or destroyed.

Accordingly, the rate of work done in one cycle and the heat transferred can be expressed under the function,

$\dot{U} = \dot{Q}-\dot{W}$

Substitute 1W for $\dot{Q}$ and 1.5 W for $\dot{W}$

$\dot{U} = 1-1(1.5)$

$\dot{U} = 2.5W$

Now calculcate the rate of specific internal energy increase,

$\dot{u} = \frac{\dot{U}}{m}$

$\dot{u} = \frac{2.5}{1.5}$

$\do{u} = 1.6667W/kg$

The rate of specific internal energy increase is 1.6667W/kg

8 0

2 years ago

A hoop is rolling (without slipping) on a horizontal surface so it has two types of kinetic energy: translational kinetic energy

LenaWriter [7]

Answer:

$\dfrac{T}{K}=1$

Explanation:

The translational kinetic energy of the hoop is given by :

$K=\dfrac{1}{2}Mv^2$ ..................(1)

M is the mass of the hoop

v is the velocity of the hoop

The rotational kinetic energy of the hoop is given by :

$T=\dfrac{1}{2}I\omega^2$

Since, $I=MR^2$

$\omega=\dfrac{v}{R}$

$T=\dfrac{1}{2}\times MR^2\times (\dfrac{v}{R})^2$ ..............(2)

From equation (1) and (2) :

$\dfrac{T}{K}=1$

Therefore, the ratio of the translational kinetic energy to the rotational kinetic energy is 1.

8 0

2 years ago

B. A hydraulic jack has a ram of 20 cm diameter and a plunger of 3 cm diameter. It is used for lifting a weight of 3 tons. Find

lozanna [386]

Answer:

option (b)

Explanation:

According to the Pascal's law

F / A = f / a

Where, F is the force on ram, A be the area of ram, f be the force on plunger and a be the area of plunger.

Diameter of ram, D = 20 cm, R = 20 / 2 = 10 cm

A = π R^2 = π x 100 cm^2

F = 3 tons = 3000 kgf

diameter of plunger, d = 3 cm, r = 1.5 cm

a = π x 2.25 cm^2

Use Pascal's law

3000 / π x 100 = f / π x 2.25

f = 67.5 Kgf

4 0

2 years ago

What is the equation describing the motion of a mass on the end of a spring which is stretched 8.8 cm from equilibrium and then

Darya [45]

Answer:

$y = -8.37 cm$

Explanation:

As we know that the equation of SHM is given as

$y = A cos(\omega t)$

here we know that

$\omega = \frac{2\pi}{T}$

here we have

$T = 0.66 s$

now we have

$\omega = \frac{2\pi}{0.66}$

$\omega = 3\pi$

now we have

$y = (8.8 cm) cos(3\pi t)$

now at t = 2.3 s we have

$y = (8.8 cm) cos(3\pi \times 2.3)$

$y = -8.37 cm$

6 0

2 years ago

Read 2 more answers

Grain is pored into a silo to be stored for later use. Due to the friction between pieces of grain as they rub against eachother

MariettaO [177]

Answer:

3.1×10⁻¹¹ N

Explanation:

Use Coulomb's law:

F = k q₁ q₂ / r²

F = (9×10⁹) (6.0×10⁻¹⁰) (2.3×10⁻¹⁵) / (0.02 m)²

F = 3.1×10⁻¹¹

6 0

2 years ago