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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 microwave oven operates at 2.4 GHz with an intensity inside the oven of 2650W/m2. What is the amplitude of the oscillating electric field
A 11.0 g bullet is fired horizontally into a 109 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 146 N/m. what was the speed of the bullet at impact with the block
A trolley that moves along a horizontal beam is acted upon by two forces as shown. What is the corresponding magnitude of the resultant
A small current loop of area A=0.0008m2 and moment of inertia I=6.9e-07kgm2 carries a current i=0.0039A with its magnetic moment perpendicular to the Earth's magnetic field. What is the magnitude of the net torque T on the loop
A pitcher pitches a baseball of mass 0.20 kg. The baseball arrives at home plate with a speed of 40 m/s and is batted directly back to the pitcher (horizontally) with a return speed of 50 m/s. find the magnitude of the average force of the bat on ..
Transverse waves with a speed of 48.7 m/s are to be produced on a stretched string. What is the required tension in the string
A parachutist descending at the speed of 25 m/s loses a shoe at an altitude of 50 m. (Assume the positive direction is upward.)
The maximum torque experienced by a coil in a 0.80 T magnetic field is 8.4 10-4 N · m. What is the length of the wire from which the coil is made
The wire in a 150 W aquarium heater has a diameter of 0.12 mm and is made of iron, What resistance should the wire have while the heater is operating
During the Millikan experiment used to determine the charge on the electron, a charged polystyrene microsphere is released in still air in a known vertical electric field, How many excess electrons are on the sphere
If the weight of a room full of water is so great, why don't the first floors of houses built over basements all collapse as flooded to the ceiling.
A parabolic reflector brings 10% of 10^4 square meters of sunlight to bear on a 2 meter deep swimming pool that holds 100 metric tons of water for one hour daily. Assuming the pool's temp starts at 30 degrees C, how hot is it in one hour?
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