The initial velocity is 
Explanation:
The motion of the ball is a projectile motion, therefore it consists of two independent motions:
- A uniform motion (constant velocity) along the horizontal direction
- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction
In this problem, we just need to analyze the horizontal motion: the horizontal velocity is constant, therefore the horizontal distance travelled is given by
where
is the horizontal velocity
t is the time of flight
Here we have:
t = 0.45 s
x = 3.0 m
And so solving for , we find
And since the ball was initially projected horizontally, this is also the initial velocity.
Learn more about projectile motion:
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Trying to move a large object such as a furniture piece across carpet.
Answer:
Colour
Malleability
Ductility
Lustre
Conductivity
Softness
Explanation:
Color : Silver-White.
Malleability : Capable of being shaped or bent.
Ductility : Easily pulled or stretched into a thin wire.
Luster : Has a shine or glow.
Conductivity : Good transmission of heat or electricity.
Softness : Soft enough to be cut with a knife.
Answer:
Explanation:
Some data in the problem are missing.
Missing values:
Radius of the cylinder: 13 cm
Height of the cylinder: 4 cm
The volume of a cylinder is given by
where
r is the radius of the base of the cylinder
h is the height of the cylinder
In this problem, we have:
r = 13 cm (radius)
h = 4 cm (height)
Therefore, the volume of the cylinder is:
Answer:
d. observing sunspots on the Sun and mountains on the Moon
Explanation:
Galileo was an Italian Physicist and Astronomer and is regarded as the father of modern Physics.
It was previously believed that the objects in the heavens such as the sun, moon and stars were perfect and rough till he observed sunspots on the sun and mountains on the moon which indicates the surface of the moon is rough with mountains and craters.
