Acoustics Answers

A Carnot engine has an efficiency of 0.5 while working between a source at 400K and a sink at TK. The temperatures of both the source and the sink are changed. Calculate the efficiencies of the engine when temperatures are (a) increased by 100°C and (b) decreased by 100°C. Interpret your result physically.

The velocity of a particle is v=5+2 (a1+a2t) where a1and a2 are constants and t is the time. What is the eccelaration oif the particle.

On a vehicle crash simulation, a car of mass 1200 kg is travelling at a velocity of 40 mph in the easterly direction when it is hit by a truck of mass 3300 kg travelling at a velocity of 25 mph from the westerly direction. Assuming that the two vehicles become entangled calculate in m/s their combined velocity after the crash.
Take 1.61 km/hr = 1 mph

a car starts from rest and attains a velocity of 18 km/h in 2 sec find it accerleration in S.I unit

a centripetal accereration vector points _ of a circle
away from the center
toward the center
tangent to the arc
none of these

a car turns a corner at 10mph. If it were to turn the corner at 30 mph, the centripetal acceleration would be ___
nine times larger
three times larger
one third as large
one ninth as large

as an object falls__________
both velocity and acceleration increase
velocity increases and acceleration decreases
velocity increases and accerlation is unchanged
both velocity and acceleration remain unchanged

A lift is filled with patients has a total mass of 2055 kg. As the lift begins to go up, the acceleration is 0.75 m/s2. What is the tension in the rope that is lifting the lift? Validate your solution as well.

A bus’s tire rotates at an initial angular speed of 20.5 rad/s. The driver accelerates, and after 4.5 s the tire’s angular speed is 29.0 rad/s. What is the tire’s average angular acceleration during the 4.5 s time interval?

In 100 seconds a smoke alarm emits 1 000 000 sound waves. What is the frequency of the sound waves?