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When an ambulance is stationary, the siren gives off a sound at a frequency of 500 Hz. In answering the following questions assume that the speed of sound is 340 m/s. What is the frequency of the stationary siren as perceived by an observer in a car driving toward the ambulance at 25 m/s?
At a reception, a 0.5 kg chunk of ice at -10 degres Celsius is placed in 3.0 kg of "iced" tea at 20 degrees Celsius. At what temperature and in what phase will the final mixture be
A photographer uses his camera, whose lens has a 70mm focal length, to focus on an object 4.5m away. In which direction must the lens move to focus on this second object
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1040 Hz, What is the speed of the bird, expressed as a percentage of the speed of sound
Suppose you're building a scale model of the hydrogen atom, How many miles away (1 mi = 1.61 Ã- 105 cm) should the electron be placed
A ranger in a national park is driving at 44 km/h when a deer jumps onto the road 70 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of -3.00 m/s2.
As a civil engineering intern during one of your summers in college, you are asked to design a curved section of roadway that meets the following conditions: at what angle should the road be banked
A 0.500 kg block is attached to one end of a 4.00 g string. The other end of the string is secured to the center of a frictionless tabletop. What type of force must the tension in the string provide
Different values of the energy
A ball with mass 2.5 kg is moving in outer space with a velocity of 6.0 m/s horizontally, Find the final velocity of the pair
he cable of the 1400 kg elevator cab in the figure snaps when the cab is at rest at the first floor, Find the speed of the cab just before it hits the spring
A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -95?C. By how much does her mass increase
The speed of light is 3 x 10^8 m/s. The sun is 93 million miles from earth. How many minutes does light take to reach the earth
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