SHM and Mechanical Waves

A ball vibrates back and forth from the free end of a massless spring with spring constant 20 N/m, if the amplitude of the motion is 0.3 m, what is the kinetic energy of the ball when it is 0.3 m away from equilibrium?

• 0 J

• 0.22 J

• 0.45 J

• 0.9 J

A ball vibrates back and forth from the free end of a massless spring with spring constant 20 N/m, if the amplitude of the motion is 0.3 m, what is the total mechanical energy of the ball?

• 0 J

• 0.3 J

• 3 J

• 0.9 J

A 40 g ball vibrates back and forth from the free end of a massless spring with spring constant 20 N/m, if the amplitude of the motion is 0.3 m, which equation describes the position vs time function for the ball

• x = 0.3 sin(t)

• x = 0.3 cos(0.28 t)

• x = 0.3 cos(20 t)

• x = 20 cos(0.3 t)

The period of a pendulum that is 1 m long on another planet is 1.66 s. What is the freefall acceleration on this planet if the mass of the pendulum is 1.5 kg

• 14.3

• 13.3

• 15.7

• 17.2

Consider a block on a spring. At which of the following locations does the block have the greatest velocity?

• when the spring is compressed completely

• when the block goes through equilibrium

• when the spring is stretched out

• the velocity is always constant

What happens to a simple harmonic oscillator if the amplitude increases?

• frequency increases by the same amount

• frequency does not change

• frequency decreases

• frequency increases faster

Consider a spring mass oscillator and a pendulum that have the same period on earth. We take these oscillators to another planet that has a gravitational acceleration of 2g. What happens to the period of each oscillator?

• only the period of the pendulum changes

• both oscillators would have the same period but it becomes smaller

• the periods do not change

• only the period of the spring mass oscillator changes

A stationary source emits sound waves of frequency f that travel through the air with speed v. If the frequency of the source changes to 2f, what will be the speed of the new wave?

• 2v

• 4v

• v

• v/2

A wave carries...?

• energy only
• matter only
• energy and matter
• neither

What property of this wave is represented by the letter "A"

• amplitude
• crest
• trough
• wavelength

Tags

NGSS.MS-PS4-1