Answer:
option (c)
Explanation:
According to the doppler's effect, the frequency of sound decreases.
If there is a relative motion between the source and the observer, the frequency of sound changes apparently.
the formula of the doppler effect is given by
where, f is the real frequency, v be the speed of sound, vo be the speed of the observer, here, the bus is the observer.
So, the value of f' < f
Let's list the given information. The frictional force, denoted as Ff, is equal to 0.200 N. We have to find the normal force, denoted as Fn. The relationship between Ff and Fn is written as:
Ff = μFn
where μ is the coefficient of friction
If there is no given data for μ, we can't solve this problem. Suppose μ = 0.5, then the normal force would be:
Fn = Ff/μ = 0.2/0.5 = 0.4 N
Answer:
radio telescope, because it captures radio waves from space
Explanation:
The technology the scientists used to capture the image is likely to be a radio telescope. This telescope is able to produce images from electrical signals transmitted by the radio waves the trail of the asteroid generates.
- Telescope are used to study very far and distant bodies.
- So, due to their special design, it is the best instrument to use for this kind of study.
- The radio telescope picks radio waves produced from astronomical bodies in space.
Explanation:
50 meters north in 10 seconds.
speed = distance ÷ time = 50 meters ÷ 10 seconds = 5m/s
Answer:
Sonia will experience repulsion in two balloons
Explanation:
Here when we rub the balloon with the woolen cloth then due to friction between the cloth and balloon electrons from balloon will transfer to woolen cloth.
Due to transfer of electron the balloon will get positive charge which is given by
so here since both balloons are rubbed against woolen cloth so both balloon will get some positive charge
now we know by the property of charge that two similar charges will always repel each other so here two balloons will repel each other after they rubbed against woolen cloth.