Answer:
1. Velocity match with B
2. Speed watch with E
3. Gravity match with C
4. Deceleration match with A
5. Newton match with D
Explanation:
1.)
Velocity is defined as the time rate of change of displacement. It is a vector quantity. So it has certain direction as mention in option B. So B is the correct matching.
v = Δd/Δt
2.)
Speed is defined as the time rate of change of distance. It is a scalar quantity. It is same as velocity but only difference is that velocity has magnitude as well as direction but speed has only magnitude. As in option E, direction not mentioned. So E is the correct matching.
3.)
Gravity is the force of attraction between any two objects, two masses. It is not only the force between body and the Earth but it is the force that exist between any two bodies in the universe. C is the correct matching.
4.)
Deceleration is actually the acceleration but in the opposite direction. It is also called negative acceleration. When the velocity of the object increasing it is acceleration and when velocity decreasing it is called deceleration. It is always opposite direction to velocity. So A is the correct matching.
5.)
Newton is the name of the scientist. Also it is the unit of force in metric system. Here newton means unit of force because n of newton in small letter. From Newton's second law of motion
F = ma
= (kg)(m/s²)
= N
Thus,
N = kgms⁻²
Option D is correct matching.
The first one is in circles and the second one is horizontally
Explanation:
Work = change in energy
W = ΔKE
W = ½ m (v² − v₀²)
W = ½ (1750 kg) ((27 m/s)² − (15 m/s)²)
W = 441,000 J
W = 441 kJ
Answer:
Explanation:
The missing question her is: What is the change in momentum of the baseball?
According to the Impulse-Momentum Theorem, we have:
Where:
is the exerted force
is the time interval
is the change in momentum
So, in the case of the bat and the ball we have:
For the bat:
(1)
For the ball:
(2)
Since is the same for both the bat and the ball, their impulses are equal in magnitude but in opposite direction according to Newton's 3rd law of motion. Hence:
(3)
Then:
(4)
Where:
Being , ,
Being
Then (4) is rewritten as:
(5)
Since :
(6)
Isolating :
(7)
(8)
(9)
Now, the change in momentum of the baseball is:
(10)
Substituting (9) in (10):
(11)
Finally:
This is the change in momentum of the baseball. Note it is negative because its initial velocity is greater than its final velocity
FIRST STOP: EARTH'S ATMOSPHERE
Once the sun's energy reaches earth, it is intercepted first by the atmosphere. A small part of the sun's energy is directly absorbed, particularly by certain gases such as ozone and water vapor. Some of the sun's energy is reflected back to space by clouds and the earth's surface.