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lorasvet [3.4K]
2 years ago
15

What is the period of a 3. 98 m long pendulum? What is the period of a 99. 4 cm long pendulum?.

Physics
1 answer:
madam [21]2 years ago
4 0

A pendulum's time period is the amount of time it takes to complete one oscillation. The pendulum with a length of 3.98 m and a length of 99.4 cm will have a time period of 4 and 1.99 seconds, respectively.

<h3>What is the definition of a simple pendulum?</h3>

A simple pendulum is a device with a point mass hanging from fixed support and connected to a light inextensible thread.

The vertical line going through the fixed support represents the mean position of a basic pendulum.

h = vertical distance from the point of suspension

L = length of the simple pendulum

The time period of the simple penduum is given by

\rm T = 2\pi\sqrt{\frac{l}{g} }

For l = 3.98 m

\rm T = 2\times 3.14 \sqrt{\frac{3.98}{9.81} }

T = 4 second

For  l = 99.4 cm = 0.994 m

\rm T = 2\times 3.14 \sqrt{\frac{0.994}{9.81} }

T = 1.99 second

The time period of the pendulum having 3.98 m and 99.4 cm in length will be 4  and 1.99 seconds respectively.

To learn more about the simple pendulum refers to the link;

brainly.com/question/14759840

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A thick steel sheet of area 100 in.2 is exposed to air near the ocean. After a one-year period it was found to experience a weig
vladimir1956 [14]

Answer:

Therefore the rate of corrosion 37.4 mpy and 0.952 mm/yr.

Explanation:

The corrosion rate is the rate of material remove.The formula for calculating CPR or corrosion penetration rate is

CPR=\frac{KW}{DAT}

K= constant depends on the system of units used.

W= weight =485 g

D= density =7.9 g/cm³

A = exposed specimen area =100 in² =6.452 cm²

K=534 to give CPR in mpy

K=87.6  to give CPR in mm/yr

mpy

CPR=\frac{KW}{DAT}

        =\frac{534\times( 485g)\times( 10^3mg/g)}{(7.9g/cm^3) \times (100in^2)\times (24h/day)\times (365day/yr)\times 1yr}

        =37.4mpy

mm/yr

CPR=\frac{KW}{DAT}

        =\frac{87.6\times (485g)\times (10^3 mg/g)}{(7.9g/cm^3)\times (100in^2)\times(2.54cm/in)^2\times (24h/day)\times (365day/yr)\times 1yr}

       =0.952 mm/yr

Therefore the rate of corrosion 37.4 mpy and 0.952 mm/yr.

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If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy.
Alina [70]

If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy. It is a true statement .

Kinetic energy is the energy that an object possesses due to its motion. It is basically the energy of mass in motion. Kinetic energy can never be negative and it is a scalar quantity i.e. it provides only the magnitude and not the direction.

According to law of conservation of mechanical energy change in potential energy is equal and opposite to the change in the kinetic energy.

According to the principle of conservation of mechanical energy, The total mechanical energy of a system is conserved i.e., the energy can neither be created nor be destroyed; it can only be internally converted from one form to another if the forces doing work on the system are conservative in nature.

since, potential energy is stored in the form of work done

Work done = Fs cos (theta)

If force always acts perpendicular to an object's direction of motion

theta =   90 °

cos (90 ) = 0

Work done  = 0

since , there is no work done , hence kinetic energy will not change

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brainly.com/question/12669551

#SPJ4

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