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
Answer:
v = 384km/min
Explanation:
In order to calculate the speed of the Hubble space telescope, you first calculate the distance that Hubble travels for one orbit.
You know that 37000 times the orbit of Hubble are 1,280,000,000 km. Then, for one orbit you have:
You know that one orbit is completed by Hubble on 90 min. You use the following formula to calculate the speed:
hence, the speed of the Hubble is approximately 384km/min
Answer:
Velocity of truck is 21.875 m/s.
Explanation:
Given:
Mass of the car (m) = 2500 kg
Initial speed of the car (u) = 35 m/s
Mass of the truck (M) = 4000 kg
Initial speed of the truck (U) = 0 m/s (Rest)
As per question, the total momentum of the car gets transferred to the truck.
Therefore, the final momentum of the car is 0.
Momentum is given as the product of mass and velocity.
So, if momentum becomes zero means the velocity becomes 0.
Therefore, final velocity of the car (v) = 0 m/s
Let the final velocity of truck be 'V' m/s.
Now, during collision, the total momentum remains conserved.
Initial momentum = Final momentum.
Initial momentum of car + Initial momentum of truck = Final momentum of car + Final momentum of truck.
⇒
Therefore, the velocity of the truck is 21.875 m/s.
