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A car is accelerating while its horn is blowing. Just after the car passes a stationary person, the person hears a frequency of 960 Hz. 17.5 seconds later, the frequency heard by the person has decreased to 927 Hz. When the car is stationary, its horn emits a sound whose frequency is 1060 Hz. The speed of sound is 343 m/s. What is the acceleration of the car? Assume that the velocity of the car is always in the positive direction.
What is the frequency of rotationA 10kg baby is perched at the rim of a 40kg disk. The disk rotates freely in a horizontal plane at 1 rev/s. What is the frequency of rotation in rev/s when the baby arrives at the center
A physics book slides off a horizontal tabletop with a speed of 2.70{\rm m}/{\rm s} . It strikes the floor in 0.350{\rm s} . Ignore air resistance. Find the height of the tabletop above the floor
In a certain automobile engine with an efficiency of 20.9%, combustion of gasoline in one cylinder releases 510 J of heat. Find the work done by the system of gasoline vapor
A 9.40kg projectile is fired vertically upward. Air drag decreases the mechanical energy of the projectile-Earth system by 69.5kJ throughout the projectile's ascent. How much higher would the projectile have gone were air drag negligible.
A sound wave from a siren has an intensity of 86.2 W/m2 at a certain point, compute the intensity level of the sound wave due to the ambulance
q1. a motorist travelling with constant velocity of 15 ms about 34 mph passes a school crossing corner where the speed
A wood log with a volume of 12 ft3 is submerged in water. Calculate the buoyant force (in Newtons) acting on the log
A gate in an irrigation canal is in the form of a semi-circle with radius of 4m (straight side on top). Find the hydrostatic force on the gate
Three successive resonance frequencies of an air column are 75, 125, and 175 Hz, What is the fundamental (lowest) frequency
A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 8.5×10^?3 m/s^2 less than that at sea level. What is the observatory's altitude
An automobile has a total mass of 2200 kg. It accelerates from rest to 70 km/h in 40 s. Assume each wheel is a uniform 44 kg disk. find the total kinetic energy of the automobile
An elevator cable winds on a drum of radius 80.0 cm that is connected to a motor. If the elevator moves down 9.0 m, how many revolutions has the drum made
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