Sound has a sound level of 10,000 times the threshold of human hearing. What is

Question

Sound has a sound level of 10,000 times the threshold of human hearing. What is the decibel level of the sound? 10db 100db 10,000 db 5db 40 db. A block with a mass M=1 kg is attached to a spring with a spring contact k = 100 N/m, stretched 0.1 m and released. What is the maximum velocity of the block? 1 m/s 10 m/s 20 m/s 50 m/s 100 m/s When the mass of a simple pendulum is tripled, the time required for one complete vibration and when the mass on a spring is tripled the time of one complete oscillation increases by a factor of 3; does not change does not change; increases by a factor of squareroot 3. decreases to one-third of its original value; increases by factor of 3 decreases to 1/squareroote 3 of its original value; increases by 1/squareroot 3 of it's original value increases by a factor of squareroot 3; decrease by a factor of squareroot 3. It is found that on planet x a simple pendulum of length 1 meter has a period of exactly 1 second. What is the value of g on this planet in m/s? 1.67 10 20 30 40 An object undergoes SHM and position as a function of time is presented by the following formula; x=(0.1 m)Sin(4pit).What is the period of oscillations? 2 s 1 s 0.5 s 0.1 s pi s

Explanation / Answer

here,

13)

M = 1 kg

K = 100 N/m

x= 0.1 m

the angular speed , w = sqrt(k/m) = sqrt(100/1) = 10 rad/s

the maximum speed , v = x * w = 1 m/s

the maximum speed is 1 m/s

14)

the period of the simple pendulam does not depends on its mass

so,

A) increse by a factor of 3 , doest not change

15)

l = 1 m ,

T = 2 * pi * sqrt(l/g)

1 = 2 * pi * sqrt(1/g)

g = 39.53 m/s^2

the value of g is E) 40 m/s^2

16)

x = 0.1 * sin(4 * pi * t)

compairing with equatioin x = A * sin(w * t)

w = 4 * pi

T =2 * pi /w

T = 2 * pi /( 4 * pi ) = 0.5 s

the time period is c) 0.5 s

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