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natka813 [3]
3 years ago
8

Lots of points and brainiest for first correct answer

Physics
1 answer:
sineoko [7]3 years ago
7 0
That's the answer: I've attached the pic

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Countries with traditional economies are often less developed because:
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People are resistant to change, People have political freedom, Farmers institute new farming techniques and there is little need for medical facilities.
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3 years ago
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A block with a mass M = 4.85 kg is resting on a slide that has a curved surface. There is no friction. The speed of the block af
natali 33 [55]

Answer:

The correct option is a

Explanation:

From the question we are told that

   The mass of the block is  m =  4.84 \ kg

    The height of the vertical  drop is h =  19.6 \  m

Generally from the law of energy conservation , the potential energy at the top  of the slide is equal to the kinetic energy at the point after sliding this can be mathematically represented as

        PE  =  KE

i.e     m *  g  *   h   =  \frac{1}{2} *  m *  v^2

=>    gh  =  0.5 v^2

=>   v = \sqrt{\frac{9.8 *  19.6}{0.5 } }

=>    v = 19.6 \  m/s

4 0
3 years ago
A student is creating a table with properties of electromagnetic and mechanical waves.
katen-ka-za [31]

Answer:

The property of the wave marked X is related to the source of the wave

Explanation:

The source of of origin of waves

Electromagnetic wave are waves that consists of varying electric and magnetic field that vibrate perpendicular to each other and to the direction of propagation of the wave and they are therefore transverse waves and transfer energy

Electromagnetic waves originate from the vibration of charged particles that gives off varying electric and magnetic fields

Mechanical waves are defined as waves that require a material medium such as air, water, metal, plastic, stretched leather, or wood to propagate

Mechanical waves originate from vibration of the particles of a medium

Sound waves which is a form of longitudinal mechanical waves that propagates by the vibration of the particles of a given medium about a point parallel to the direction of propagation of the wave.

8 0
3 years ago
When solid surfaces slide over each other, the kind of friction that occurs is called_____ friction.
expeople1 [14]

Answer:

Sliding Friction

Explanation:

The term sliding friction refers to the resistance created by two objects sliding against each other. This can also be called kinetic friction. Sliding friction is intended to stop an object from moving.

7 0
3 years ago
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two pendulums of lengths 100cm and 110.25cm start oscillating in phase. after how many oscillations will they again be in same p
goldfiish [28.3K]

Angular frequency of pendulum is given by

\omega = \sqrt{\frac{g}{l}}

for both pendulum we have

\omega_1 = \sqrt{\frac{9.81}{1.00}}

\omega_1 = 3.13 rad/s

For other pendulum

\omega_2 = \sqrt{\frac{9.81}{1.1025}}

\omega_2 = 2.98 rad/s

now we have relate angular frequency given as

[tex\omega_1 - \omega_2 = 3.13 - 2.98 = 0.15 rad/s[/tex]

now time taken to become in phase again is given as

t = \frac{2\pi}{\omega_1 - \omega_2}

t = \frac{2\pi}{0.15} = 41.88 s

now number of oscillations complete in above time

N = \frac{t}{\frac{2\pi}{\omega_1}}

N = \frac{41.88}{\frac{2\pi}{3.13}}

N = 21 oscillation


3 0
3 years ago
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