1. During inhalation, the pressure in the lungs is slightly less than external p
ID: 2122947 • Letter: 1
Question
1. During inhalation, the pressure in the lungs is slightly less than external pressure and the muscles controlling exhalation are relaxed. Under water, the body equalizes internal and external pressures. Knowing this:
A snorkel will work in deep water.
T/F?
2. An ice cube will float higher in an alcoholic beverage than in water. (The density of alcohol is 789 kg/m^3)
T/F?
3. A mass is attached to the wall by a spring of constant k. When the spring is at its natural length, the mass is given a certain initial velocity, resulting in oscillations of amplitude A. If the spring is replaced by a spring of constant 2k, and the mass is given the same initial velocity, the amplitude of the resulting oscillation will be doubled.
T/F?
4. If N wave crests pass an observer in S seconds then the speed of the wave is N/S
T/F?
5. If you stretch a rubber hose and pluck it, you can observe a pulse traveling up and down the hose. If you fill the hose with water the pulse will move more quickly.
T/F?
6. You are driving down the highway in your car when a police car sounding its siren overtakes you and passes you. If its frequency at rest is f0, the frequency you hear while the car is moving away from you is higher than f0?
T/F?
7. Two separate strings of the same thickness are stretched so that they experience the same tension. String B is twice as dense as String A. String A, of length L, is vibrated at the fundamental frequency. If String B has the same fundamental frequency as String A, then string B is half as long as string B.
T/F?
8. A small and uniform 10.0 kg object floats at rest with 75% of the object submerged in a cubical tank containing 50.0 m3 of water. What is the buoyant force acting on the object in Newtons?
Explanation / Answer
During inhalation, the pressure in the lungs is slightly less than external pressure and the muscles controlling exhalation are relaxed. Under water, the body equalizes internal and external pressures. Knowing this:
A snorkel will work in deep water.----true
An ice cube will float higher in an alcoholic beverage than in water. (The density of alcohol is 789 kg/m^3)-------fASLE
A mass is attached to the wall by a spring of constant k. When the spring is at its natural length, the mass is given a certain initial velocity, resulting in oscillations of amplitude A. If the spring is replaced by a spring of constant 2k, and the mass is given the same initial velocity, the amplitude of the resulting oscillation will be doubled.
FALSE
If N wave crests pass an observer in S seconds then the speed of the wave is N/S
TRUE
If you stretch a rubber hose and pluck it, you can observe a pulse traveling up and down the hose. If you fill the hose with water the pulse will move more quickly.
TRUE
You are driving down the highway in your car when a police car sounding its siren overtakes you and passes you. If its frequency at rest is f0, the frequency you hear while the car is moving away from you is higher than f0?
FALSE
Two separate strings of the same thickness are stretched so that they experience the same tension. String B is twice as dense as String A. String A, of length L, is vibrated at the fundamental frequency. If String B has the same fundamental frequency as String A, then string B is half as long as string B.
FALSE
A small and uniform 10.0 kg object floats at rest with 75% of the object submerged in a cubical tank containing 50.0 m3 of water. What is the buoyant force acting on the object in Newtons?
BYONANT FORCE = RHOv GH = 1000*7.5*9.8*50 = 3.67*10^6 n
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.