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3 years ago

PH

Physics

1 answer:

Murrr4er [49]3 years ago

5 0

Answer: For electricity to flow in a simple circuit, all of the following are required except an open loop.

Explanation:

An open loop will resist the flow of electric current in a circuit due to which the current is not supplied completely into the circuit.

As a result, electricity will not flow in a simple circuit when there is an open loop.

Resistance, current, a closed loop and voltage are responsible for providing electricity in a simple circuit.

Thus, we can conclude that for electricity to flow in a simple circuit, all of the following are required except an open loop.

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Two coins, made of different material, are placed next to each other so that they are touching. Both coins are 15mm in diameter.

nekit [7.7K]

The mass of the second coin for the given gravitation force is 20.9 g.

The given parameters;

distance between the two coins, r = 15 mm = 0.015 m
mass of one coin, m₁ = 6.5 g = 0.0065 kg
gravitational force between the coins = 4.03 × 10⁻¹¹ N

The mass of the second coin is determined by applying Newton's law of universal gravitation as shown below;

$F = \frac{Gm_1 m_2 }{R^2} \\\\m_2 = \frac{FR^2}{Gm_1} \\\\m_2 = \frac{(4.03 \times 10^{-11}) \times (0.015)^2}{(6.67 \times 10^{-11}) \times (0.0065)} \\\\m_2 = 0.0209 \ kg\\\\m_2 = 20.9 \ g$

Thus, the mass of the second coin for the given gravitation force is 20.9 g.

Learn more here:brainly.com/question/13590473

5 0

2 years ago

A 2578-kg van runs into the back of a 825-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with

allochka39001 [22]

Answer:

The initial speed of the car = 11.22 m/s

Explanation:

Law of conservation of energy: It states that when two bodied collide in a closed system, the sum of momentum before collision is equal to the sum of momentum after collision.

Note: A close system is one that is free from from external forces. E.g Frictional force.

From the law of conservation of momentum,

Total momentum before collision = Total momentum after collision.

m₁u₁ + m₂u₂ = (m₁ + m₂)V..................... Equation 1

Where m₁ = mass of the van, m₂ = mass of the car, u₁ = initial velocity of the van, u₂ = initial velocity of the car, V = Common velocity.

Given: m₁ = 2578 kg, m₂ = 825 kg, u₂ = 0 ( the car was at rest), V= 8.5 m/s

Substituting these values into equation 1, and solving for u₁

2578(u₁) + (825 × 0) = (2578 + 825)8.5

2578u₁ = 28925.5

Dividing both side of the equation by the coefficient of u₁

2578u₁/2578 = 28925.5/2578

u₁ = 11.22 m/s

The initial speed of the car = 11.22 m/s

3 0

4 years ago

Hi guys i need help with my test, Which electromagnetic waves have the shortest wavelength and the highest frequency?

snow_tiger [21]

Answer:

Gamma rays

Explanation:

8 0

4 years ago

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Frosty the Snowman accelerates from 16 m/s to 26 m/s in 2 s. What is his acceleration?

Alex_Xolod [135]

Answer:

his acceleration is 3.25

Explanation:

because you do 26÷16 which =1.625×2=3.25

6 0

3 years ago

Ten identical steel wires have equal lengths L and equal "spring constants" k. The Young's modulus of each wire is Y. The wires

svlad2 [7]

Answer:

option (B)

Explanation:

Young's modulus is defined as the ratio of longitudinal stress to the longitudinal strain.

Its unit is N/m².

The formula for the Young's modulus is given by

$Y=\frac{F \times L}{A\times \delta L}$

where, F is the force applied on a rod, L is the initial length of the rod, ΔL is the change in length of the rod as the force is applied, A is the area of crossection of the rod.

It is the property of material of solid. So, when the 10 wires are co joined together to form a new wire of length 10 L, the material remains same so the young' modulus remains same.

8 0

3 years ago