Answer: = 692.82Hz
Explanation: This question of ours is based on Doppler effect.The Doppler effect states that<em> if a source is producing sound at a specific frequency to an observer and there is a relative motion between the observer and the source, the frequency of sound perceived by the observer will be different from that of the original from the source. </em>
This represented mathematically below as
where
= observed frequency = ?
f = original frequency of sound source = 650Hz
v = speed of sound in air = 343m/s
= velocity of observer relative to the source = 0m/s ( the observer is standing, thus meaning he is not moving)
= velocity of sound source relative to the observer = 21.2m/s
by putting all of these in the formulae, we have that
Answer:
67.4 m/s
Explanation:
The force acting on the car, and that causes the car to slow down, is the force of friction, which is given by:
where
is the coefficient of kinetic friction
m is the mass of the car
is the acceleration of gravity
According to Newton's second law:
where F is the net force on the car and a its acceleration. Comparing the two equations, we find an expression for the acceleration:
(1)
Since the motion of the car is a uniformly accelerated motion, we can use the following equation:
where
v = 0 is the final velocity of the car
u is the initial velocity
a is the acceleration
s = 290 m is the distance covered by the car while slowing down
Using (1) and solving for u, we find the initial velocity:
Answer: Please see below as the answer is self-explanatory.
Explanation:
The Newton's 3rd law, in simple words, explains, that for any force exerted on an object by another one, there exists a reaction from the object acted upon, which consists in another force, that is of equal value that the one is being exerted on it, but in the opposite direction, and is acting on the the other object.
So, Newton's 3rd Law says that for any pair of objects interacting, there is a pair of forces, equal and opposite, that each of them exerts on the other.
It is very important to understand, that in any free body diagram, it must be showed only one of these forces, the reaction that the other object is exerting on the object for which we are drawing the FBD, not the two forces, as the another one is external to the other object.
One example for this is the normal force, the gravity force, etc.
Answer:
Yes, it could discern all of them.
Explanation:
A compound bright field microscope can be used to illuminate samples in light microscopes. It has a very high resolution and it could detect samples as small as 200 to 300 nanometers. So, yes it could discern two objects separated by 3μm, 0.3μm, 300nm,3000Å.