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Two cars are on the highway and moving at speeds of v1 = 14.5m/s and v2 = 70.2m/s. The second car is behind the first car and traveling in the same direction.
(a) If the first car sounds a horn at a frequency of 894Hz while the second car is closing the gap between the two of them, then what frequency do people in the second car hear?
(b) Just after the second car passes the first car, the people in the first car hear the second car's engine with a frequency of 268Hz. What is the frequency of the second car's engine? (Take the speed of sound to be 340m/s for both parts)
A solid uniform marble and a block of ice, each with the same mass, start from rest at the same height above the bottom of a hill and move down it. Find the speed of each of these objects when it reaches the bottom of the hill
An electric heater consumes electrical energy at a rate of P = 200 W when connected to a battery with an emf of 120 V. What is the current in the heater
An object is in front of a converging lens (f = 0.370 m). The magnification of the lens is m = 3.60. Through what distance should the object be moved
A kayaker needs to paddle north across a 100m wide harbor. The tide is going out, creating a tidal current that flows east at 2 m/s. The kayaker can paddle with a speed of 3 m/s.
A 1200 kg satellite completes one circular orbit of the earth every 90 minutes. Determine the radius of the satellite's orbit
We all sound like great singers in the shower, due to standing waves. Assume that your shower is 2.65 (about 8.72 ) tall and can be modeled as an organ pipe. What are the wavelengths of the first two overtones for this shower
Maddox takes off on his jet ski so they have a combined mass of 319.86kg. The skis have a thrust of 982.13N, What is Maddox's top speed
A monatomic gas is adiabatically compressed to 0.500 of its initial volume. How do each of the following quantities change The molar specific heat at constant volume
TV channel 3 (VHF) broadcasts at a frequency of 55.0 MHz. TV channel 23 (UHF) broadcasts at a frequency of 548 MHz. Find the ratio (VHF/UHF) of the wavelengths for these channels
Take the mass of the sun to be m_s = 1.99×1030 {rm kg}, gravitational constant to be G = 6.67×10-11 {rm N} cdot {rm m^2/kg^2}, and an acceleration due to gravity at the earth's surface to be g = 9.810 {rm m/s^2}.
Start from the expression of the electric filed outside an infinite sheet of uniform surface charge density, E=sigma/2epsilon, derive the electric field
A toy car of mass 2.0 kg is stationary and a child rolls a truck of mass 3.5kg straight toward it with a speed of 4.0 m/s. What is the velocity of the center of mass of the system
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