U.2
HyUCHLICS ULLSC
9. While standing near a railroad crossing, a person hears a distant...
U.2
HyUCHLICS ULLSC
9. While standing near a railroad crossing, a person hears a distant train hom. According to the train's
engineer, the frequency emitted by the horn is 440 Hz.
a) What would be the frequency heard by the person if the train were at rest?
b) What would be the frequency that reaches the bystander as the train approaches the crossing?
e) What would be the frequency that reaches the bystander once the train has passed the crossing?
10. An alarm clock is dropped off the edge of a tall building. You, standing directly under it, hear a tone of
1350 Hz coming from the clock just before you duck out of the way and it hits the ground. Would the actual
frequency of the clock be higher or lower than what you heard?
11. Two identical cars are driving toward one another and sounding their horns. You're the driver of one of
the cars. You measure your car's horn to be sounding at 512 Hz, but you measure the horn of the other car to
be sounding at 600. Hz. Are these measurements reasonable? Why?
Answers: 3
Physics, 22.06.2019 00:50
While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.
Answers: 3
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In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong chain
Answers: 2
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Steam enters an adiabatic diffuser at 150 kpa and 1208c with a velocity of 550 m/s. determine the minimum velocity that the steam can have at the outlet when the outlet pressure is 300 kpa.
Answers: 3
Physics, 22.06.2019 06:00
The frequency of vibrations of a vibrating violin string is given by f = 1 2l t ρ where l is the length of the string, t is its tension, and ρ is its linear density.† (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and ρ are constant) (ii) the tension (when l and ρ are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is ⇒ f is ⇒ (ii) when the tension is increased by turning a tuning peg df dt 0 and t is ⇒ f is ⇒ (iii) when the linear density is increased by switching to another string df dρ 0 and ρ is ⇒ f is ⇒
Answers: 3
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