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An Emergency Vehicle Siren is designed to emit an 8000 Hz sound. You hear a 9143 Hz tone as it approaches you at 40.0m/s and a 7273 Hz tone as it recedes at 32 m/s. What is the temperature of the air? (Assume sound speed is 331 + 0.60T) m/s where T is in degrees celsius
You are driving in your car along a country road at a speed of 27.0m/s. As you come over a crest of a hill, how far is the tractor in front of you when you finally stop
An 11g bullet is fired into an 11kg wood block that is at rest on the wood table. The block, with the bullet embedded, slides 5.11 across the table. The coefficient of kinetic friction for wood sliding on wood is 0.25.
A 69.00 kg skier is going down a slope oriented 33° above the horizontal. The area of each ski in contact with the snow is 0.13 m2. Determine the pressure that each ski exerts on the snow.
A 97.1-kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.67 rad/s. Find the angular velocity of the platform with its load
Falling light. According to general relativity and the equivalence principle, light is bent by gravity. Determine the time it takes for the light to strike the ground
Two charged plates create a potential difference of 190 V. At a point halfway between the plates an electron is released from rest. What was the initial speed and direction of the proton
The other end is attaced to a 3 kg disk moving in uniform circular motion on the table, which stretches the spring by 1 cm. Note: Friction is negligibe. Illustrate what is the work done on the disk by the spring during one full circle?
A car traveling 51.9 km/h is 26.2 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.84 s later. How fast is the car traveling at impact
Larger animals use proportionately less energy than smalleranimals; that is, What resting power does this correspond to
A spaceship of proper length 310 m takes 0.79 µs to pass an Earth observer. Determine the speed of this spaceship as measured by the Earth observer
An electric water heater holds 165L. If electricity costs 0.18 per , how much does it cost to raise the water temperature from 10 to 60.
A 70.0 kg football player leaps straight up into the air (with no horizontal velocity) to catch a pass. how fast was the ball travelling
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