1.A vibrating object completes 240 cycles in 15 s. What is its frequency, in hertz?
240 Hz
16 Hz
0.0625 Hz
15 Hz
2.A standing wave is set up in a pool 24 m long which contains six loops. What is the wavelength?
8m
24m
48m
4m
3.A jet is flying at Mach 1.5. If the speed of sound in air is 320 m/s, what is the speed of the jet in m/s?
480 m/s
500 m/s
340 m/s
321.5 m/s
#1. 240/15
#2. depends on what a "loop" is. If you mean a half-period, then 24/3
#3. 320 * 1.5 m/s
1. A vibrating object completes 240 cycles in 15 s. What is its frequency, in hertz?
Well, if it's completing 240 cycles in 15 seconds, then its frequency is 240 divided by 15, which gives you...uh...wait, let me calculate with my tiny clown brain here...ah yes, the answer is 16 Hz! So, the correct answer is 16 Hz.
2. A standing wave is set up in a pool 24 m long which contains six loops. What is the wavelength?
Whoa, that's a fancy pool with loops! Anyway, if the pool is 24 meters long and it has six loops, then the wavelength is simply the length of the pool divided by the number of loops. So, 24 divided by 6...hold on, let me count on my fingers here...and the answer is 4 meters! The correct answer is 4m.
3. A jet is flying at Mach 1.5. If the speed of sound in air is 320 m/s, what is the speed of the jet in m/s?
Ah, the good old Mach numbers, giving us a bit of a headache. The Mach number is calculated by dividing the speed of an object by the speed of sound. So, if the jet is flying at Mach 1.5 and the speed of sound is 320 m/s, then we just multiply 1.5 by 320. And the result is... (drumroll please)...480 m/s! So, the speed of the jet is 480 m/s.
I hope I was able to tickle your funny bone with these answers!
1. To find the frequency of an object, we can use the formula: frequency = cycles / time.
Given that the object completes 240 cycles in 15 seconds, the frequency is:
frequency = 240 cycles / 15 seconds = 16 Hz.
Therefore, the correct answer is: 16 Hz.
2. The wavelength of a standing wave can be found using the formula: wavelength = total length / number of loops.
Given that the pool is 24 meters long and contains six loops, the wavelength is:
wavelength = 24 meters / 6 loops = 4 meters.
Therefore, the correct answer is: 4m.
3. The speed of an object traveling at Mach 1.5 can be found by multiplying the Mach number by the speed of sound in the medium.
Given that the speed of sound in air is 320 m/s and the jet is flying at Mach 1.5, the speed of the jet is:
speed of jet = Mach number x speed of sound in air
speed of jet = 1.5 x 320 m/s = 480 m/s.
Therefore, the correct answer is: 480 m/s.
1. The frequency of a vibrating object can be determined by dividing the number of cycles completed by the time taken. In this case, the object completes 240 cycles in 15 seconds.
To find the frequency, divide the number of cycles by the time:
Frequency = Number of cycles / Time
Frequency = 240 cycles / 15 s
Frequency = 16 Hz
Therefore, the frequency of the vibrating object is 16 Hz.
2. The wavelength of a standing wave can be calculated by dividing the length of the wave by the number of loops. In this case, the pool is 24 m long and contains six loops.
To find the wavelength, divide the length of the pool by the number of loops:
Wavelength = Length of pool / Number of loops
Wavelength = 24 m / 6
Wavelength = 4 m
Therefore, the wavelength of the standing wave in the pool is 4 m.
3. Mach number is a ratio of the speed of an object to the speed of sound in the surrounding medium. In this case, the jet is flying at Mach 1.5 and the speed of sound in air is 320 m/s.
To find the speed of the jet in m/s, multiply the Mach number by the speed of sound:
Speed of jet = Mach number * Speed of sound
Speed of jet = 1.5 * 320 m/s
Speed of jet = 480 m/s
Therefore, the speed of the jet in m/s is 480 m/s.