The speed of a particle is the instantaneous rate at which its distance of travel
is changing.
Over any finite period of time, its speed is:
(distance traveled) / (time to travel the distance).
The direction of travel is irrelevant to a description of speed.
Answer:
243.83 Hz
Explanation:
Given the following :
Recall :
When source is stationary and observe is in motion:
Moving away from the source :
Observed frequency f₀ = f(v-v₀/v)
Moving towards the source :
f₀ = f(v+v₀/v)
Hence ;
v₀ = 12.1 m/s ; f of trumpeter = 262 Hz ; speed of sound (v) = 337m/s
f(v+v₀/v) = 262(v-v₀/v)
f = 262(v-v₀/v) / (v+v₀/v)
f = 262(v-v₀/v) * (v / v+v₀)
f = 262 (v-v₀ / v+v₀)
f = 262 ((337 - 12.1) / (337 + 12.1))
f = 262 (324.9 / 349.1)
f = 262 (0.93067888857)
f = 243.83
f = 244Hz
The correct option is this: PHYSICAL CHANGES: BREAKING THE STICKS AND BOILING THE WATER. CHEMICAL CHANGE: LIGHTNING THE FIRE.
In chemistry, a physical change refer to a change in which no new material is formed while a chemical change refers to a change in which a new material is formed. Boiling of water does not change water into another thing, even when the water changes to vapor, it will still turn to water again when it cools down, so boiling is a physical change, so also the breaking of sticks. Lightening a fire on the other hand is a chemical change because a new material is formed and the original material can not be recovered. Putting fire on the sticks will turn the sticks to ashes and the sticks can not be recovered from the ashes, so this is a chemical change.
<span>The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come.</span>
