Answer:
d = 1.65 m
Explanation:
Given that,
The speed of a ball, v = 3 m/s
A ball rolls a level table that is 1.5 m above the floor.
We can find how long the ball is in free fall. We can use the second equation of kinematics as follows :

u is the initial speed in the vertical direction
So,

Now, using the formula of velocity.

So, the landing spot is at 1.65 m from the table.
Answer:
Assumption: the acceleration of this bus is constant while the brake was applied.
Acceleration of this bus: approximately
.
It took the bus approximately
to come to a stop.
Explanation:
Quantities:
- Displacement of the bus:
. - Initial velocity of the bus:
. - Final velocity of the bus:
because the bus has come to a stop. - Acceleration,
: unknown, but assumed to be a constant. - Time taken,
: unknown.
Consider the following SUVAT equation:
.
On the other hand, assume that the acceleration of this bus is indeed constant. Given the initial and final velocity, the time it took for the bus to stop would be inversely proportional to the acceleration of this bus. That is:
.
Therefore, replace the quantity
with the expression
in that SUVAT equation:
.
Simplify this equation:
.
Therefore,
.
In this question, the value of
,
, and
are already known:
Substitute these quantities into this equation to find the value of
:
.
(The value of acceleration
is less than zero because the velocity of the bus was getting smaller.)
Substitute
(alongside
and
) to estimate the time required for the bus to come to a stop:
.
The correct answer is:
<span>C) The actual frequency of the siren does not change despite appearances.
In fact, Bob will observe an increase in the apparent frequency as the emergency vehicle approaches him, while Jill will observe a decrease in the apparent frequency as the emergency vehicle moves away from him, because of the Doppler effect (the relative velocity between the observer and the source of the sound is changing), but this effect involves the apparent frequency, while the real frequency of the siren will remain the same.</span>
Based on the equation KE = 1/2(m)(v^2), Kinetic Energy can be measured based on velocity. If an object has a large velocity, it have a larger kinetic energy than if the velocity is small.
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Fe and S are both reactants: they react with each other to give a different compound.
FeS is the product of the reaction: it was formed or produced as result of the reaction of Fe and S.
Answer:
Fe: reactant
S: reactant
FeS: product