A 5.00 kg pendulum swings back and forth. At the top of its arc, it reaches a height of 0.36 m. What is the velocity of the pendulum at the bottom of the arc?0m/s
2.7m/s
7.2m/s

Answers

Answer 1

Answer: Tools we'll use:

--    Gravitational potential energy = (mass) x (gravity) x (height)

--    Kinetic energy (of a moving object) = (1/2) (mass) x (speed)²

When the pendulum is at the top of its swing,
its potential energy is

   (mass) x (gravity) x (height)

   = (5 kg) x (9.8 m/s²) x (0.36 m)

   = (5 x 9.8 x 0.36) joules

   = 17.64 joules .

Energy is conserved ... it doesn't appear or disappear ...
so that number is exactly the kinetic energy the pendulum
has at the bottom of the swing, only now, it's kinetic energy:

   17.64 joules = (1/2) x (mass) x (speed)²

   17.64 joules = (1/2) x (5 kg) x (speed)²

Divide each side by 2.5 kg:

   17.64 joules / 2.5 kg = speed²

Write out the units of joules:

   17.64 kg-m²/s² / 2.5 kg = speed²

   (17.64 / 2.5) (m²/s²) = speed²

   7.056 m²/s² = speed²

Take the square root
of each side: Speed = √(7.056 m²/s²)

   = 2.656 m/s .

Looking through the choices, we're overjoyed to see
that one if them is ' 2.7 m/s '. Surely that's IT !
_______________________________

Note:
The question asked for the pendulum's 'velocity', but our (my) calculation
only yielded the speed.

In order to describe a velocity, the direction of the motion must be known,
and the question doesn't give any information on exactly how the pendulum
is hanging, and how it's swinging.

We know that at the bottom of its swing, the motion is completely horizontal,
but we have no clue as to what direction. So all we can discuss is its speed.

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If you were trying to build a soundproof room, which of the following materials would you choose in order to absorb the most sound, based on the coefficient of absorption for each material? A. Heavy curtains B. Wood C. Concrete D. Carpet

Answers

The material that would absorb the most sound is Heavy curtains (Option A)

What material absorbs the most sound?

The effectiveness of a material in absorbing sound is typically measured by its coefficient of absorption.

The coefficient of absorption ranges from;

0 (perfectly reflective, no sound absorption) to
1 (perfectly absorptive, all sound is absorbed)

Based on the coefficient of absorption for each material listed, the best choice for sound absorption would be Heavy curtains.

Heavy curtains are often designed with sound-absorbing properties, and they can have a coefficient of absorption higher than other materials like wood, concrete, or carpet.

The ranking of the absorption of the materials are;

Heavy curtains (0.5) > Carpet (0.2) > Wood (0.05) > Concrete (0.02)

Learn more about sound absorption here: brainly.com/question/16297116

#SPJ6

Coefficients of Absorption for Common Materials

(from Penn Foster) ⭐⭐⭐⭐⭐

Material Coefficient of Absorption

Perforated acoustic ceiling material 60%

Heavy curtains (A) 50%

Carpeting (D) 20%

Wood (B) 5%

Plaster 3%

Clay tile 3%

Concrete (C) 2%

The answer is A. Heavy curtains ✅

what type of boundary occurs where two plates move together causing one plae to descend in the mantle beneath the other plate

Answers

This is called a subduction zone. The two plates converge, but one is forced under the other.

convergent boundary is the correct answer

Frequency corresponds to the perception of a sound's A) Loudness B) Timbre C) Pitch D) Duration

Answers

Answer:

d.] duration

Explanation:

no explanation

2 What does how much, how
long and how
often have to do with exposure to chemicals?

Answers

Well how much, how long, and how often

For example how much is like how much a object is left in a small room with chemicals

How long is the time

how often is how much the same cycle is done repeatedly

how much energy is transferred when 1 gm of boiling water at 100 degree celcius condenses to water at 100 degree celcius?

Answers

The latent heat of vaporization for water is 2257 KJ per Kg . I'm pretty sure that's exactly the same as 2257 joules per gram. So ... When 1 gm of STEAM at 100 C condenses to 1 gm of liquid water at 100 C, it releases 2257 joules of heat energy to its environment.

22.5 x 10 to the power 5 kilo/joules energy is transferred when boiling water at 100 degree celcius condenses to water at 100 degree celcius

Well-designed weight-training programs only target two or three body areas.a. True
b. False

Answers

False, well designed weight training programs actually target most of the muscles in the body. A good weight training program includes many compound exercises to activate multiple muscle groups and promote muscle hypertrophy. Some isolation exercises may also be included to target a specific muscle and help it grow.

Well-designed weight-training programs do not only target two or three body areas.

The statement that well-designed weight-training programs only target two or three body areas is FALSE.

Well-designed weight-training programs aim to target different muscle groups in the body to promote overall strength and balanced development. These programs often include exercises that involve the chest, back, shoulders, arms, legs, and core.

For example, a weight-training program might include exercises like bench press (chest), rows (back), shoulder press (shoulders), bicep curls (arms), squats (legs), and planks (core).