An ambulance is driving towards the hospital at a velocity 108 km/h and emitting a steady 798-hz sound from its siren. the sound reflects off the front of the hospital and is received by the same ambulance. in addition to it's own siren, the ambulance hears a shifted tone from the reflection at what frequency? the speed of sound on this day is 343 m/s. a. 1.06e+3hz b. 855hz c. 850hz d. 1.08e+3hz e. 950 hz

To solve this problem we will apply the concepts related to the Doppler effect. The Doppler effect is a physical phenomenon where an apparent change in wave frequency is presented by a sound source with respect to its observer when that same source is in motion. Mathematically it can be described as

The meaning of each of these variables is,

Velocity of detector

=Frequency of wave emitted by source

Velocity of source

v=Velocity of sound wave

=Frequency received by detector

Replacing we have that,

Therefore the correct option is e. 950Hz

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: