Answer:
0.5 kg
Explanation:
The momentum of an object is defined as
p = mv
where
m is the mass
v is the velocity
In this problem we have,
v = 15 m/s is the velocity of the stone
p = 7.5 kg m/s is the momentum
Solving for m, we can find the mass of the stone:
Answer:
The speed of the package of mass m right before the collision
Their common speed after the collision
Height achieved by the package of mass m when it rebounds
Explanation:
Have a look to the diagrams attached below.
a.To find the speed of the package of mass m right before collision we have to use law of conservation of energy.
where is Kinetic energy and
is Potential energy.
and
Considering the fact we will plug out he values of the given terms.
So
Keypoints:
<u>KE = Kinetic Energy and PE = Potential Energy</u>
b.Now when the package stick together there momentum is conserved.
Using law of conservation of momentum.
where
.
Plugging the values we have
Cancelling m from both sides and dividing 3 on both sides.
Law of conservation of energy will be followed over here.
c.Now the collision is perfectly elastic
We have to find the value of for m mass.
As here we can use that if both are moving in right ward with
then there is a
velocity when they have to move leftward.
The best option is to use the formulas given in third slide to calculate final velocity of object .
So
Now using law of conservation of energy.
The linear momentum is conserved before and after this perfectly elastic collision.
So for part a we have the speed for part b we have their common speed
and for part c we have the rebound height
.
B. At the equator
Explanation:
The energy coming from the Sun hits the Earth's surface at different angles, depending on the latitude of the place. The more perpendicular the ray of lights hit the surface, the more the energy transmitted to the Earth's surface, the warmer the location.
The angle at which the ray of lights hit the Earth is related to the latitude: in particular, the ray of lights arrive perpendicular at the equator (), they arrive at larger angle in the United States (which is located at intermediate latitudes) and they arrive at the largest angles at the poles. For this reason, the sun's most energy is concentrated at the equator.