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3 years ago

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Physics

1 answer:

7nadin3 [17]3 years ago

8 0

Answer:

The poles of an electromagnet can even be reversed by reversing the flow of electricity. If a wire carrying an electric current is formed into a series of loops, the magnetic field can be concentrated within the loops. ... All of their little magnetic fields add together, creating a stronger magnetic field.

Explanation:

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tatiyna

The answer is A. A folkway is a closely held belief by a specific group of people.

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2 years ago

Read 2 more answers

An elite tour de france cyclist can maintain an output of 420 watts during a sustained climb. at this output power, how long wou

julia-pushkina [17]

<span>2002 seconds, or 33 minutes, 22 seconds. First, let's calculate how many joules it will take to lift 78 kg against gravity for 1100 meters. So: 78 kg * 9.8 m/s^2 * 1100 m = 840840 kg*m^2/s^2 Now a watt is defined as kg*m^2/s^3, so a division of the required joules should give us a convenient value of seconds. So: 840840 kg*m^2/s^2 / 420 kg*m^2/s^3 = 2002 seconds. And 2002 seconds is the same as 33 minutes, 22 seconds.</span>

7 0

2 years ago

A block floats partially submerged in a container of liquid. When the entire container is accelerated upward, which of the follo

Nookie1986 [14]

Answer:C

Explanation:

Partially submerged block along with vessel is accelerated upwards .

Initially the block weight is supported by buoyant force such that it is in equilibrium.

when the system start accelerating upwards then the effective gravity will be

g+a where a is the acceleration of the system.

so only net gravity is increased so block will not ascend or descend.

Mathematically

$F_b=weight$

$\rho _L\cdot V\cdot (g+a)=m(g+a)$

where $\rho _L=$ density of liquid

V=volume of object inside the water

7 0

2 years ago

Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are tripled and their separation

Vera_Pavlovna [14]

Answer:

The force remains the same.

Explanation:

Let the magnitude of the forces in each case be F1 and F2 respectively.

The charges are Q1 and Q2.

The distance of separation between them is R.

Hence, for F1;

F1 = KQ1Q2/R^2

For F2:

F2 = K * 3Q1 * 3Q2/(3R)^2

F2 = 9KQ1Q2/9R^2

F2 =KQ1Q2/R^2

Hence F1=F2

The force is the same in both cases!

8 0

2 years ago

(a) The mass of the package is 36 kg.

ira [324]

Answer:

846.72 J

Explanation:

Given that,

The mass of the package = 36 kg

It is raised through a vertical height of 2.4 m.

Initial potential energy of the package will be 0 as it was at ground.

The change in gravitational potential energy is given by :

$\Delta E=mgh\\\\=36\times 9.8\times 2.4\\\\=846.72\ J$

Hence, the change in gravitational potential energy is 846.72 J.

6 0

2 years ago