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A sport car with a turned on loud siren is moving with speed 297 km/h. Frequency of the siren is 988 Hz. There is another sport car with a same turned on siren is parked ahead, further down the road. Each driver can hear the sound of other siren because its pitch is higher than pitch of its own siren. What frequency hears the moving car?Speed of sound in air = 340m/
What happens to the buoyant force as the submersible is lifted out of the water. Write two or three sentences explaining your answer.
In recent years, astronomers have found planets orbiting nearby stars that are quite different from planets in our solar system. What would be the period of a satellite
The maximum wavelength for which an electromagnetic wave can ejectelectrons from a platinum surface is 196 nm. what is the maximum speed of the ejected electrons
A 26-turn, 12-cm-diameter coil is oriented in a vertical plane with its axis aligned east-west. What is the emf induced in the coil
in a single-slit diffraction experiment, a beam of monochromatic light of wavelength 630 nm is incident on a slit of width 0.4 mm. what is the width of the central bright fringe
Each second, a nuclear power plant generates 2000 MJ of thermal energy from nuclear reactions in the reactor's core. What is the maximum possible thermal efficiency of the power plant
A telescope has an objective with a refractive power of 1.00 diopters and an eyepiece with a refractive power of 300 diopters
An outfielder throws a 0.125-kg baseball at a speed of 75.0 m/s and an initial angle of 30.0°. What is the potential energy of the ball at the highest point of its motion?
1= A small, 100 g cart is moving at 1.70 m/son an air track when it collides with a larger, 1.00 kg cart at rest. After the collision, the small cart recoils at 0.860 m/s. What is the speed of the large cart after the collision?
An electron is moving through a region of space which possessesa uniform electric field and uniform magnetic field. The electricpoint in the positive x direction and has a magnitude of E = 2,500v/m.
What is the magnitude of the force on the negatively charged object due to the positively charged object? What is its direction? Show your work and explain your reasoning.
What key compound makes photosynthesis in green plants possible? Of what importance is the atmospheric ozone layer? What causes the displays of lights called auroras?
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