Maximum height: h = v0² sin² α / 2 g
Horizontal range: x = v0² sin 2 α / g
13.5 v0² sin² α /2 g = v0² sin 2 α /g / : v0²/g
6.75 sin² α = 2 sin α cos α / : sin α
6.75 sin α = 2 cos α / : cos α
6.75 tan α = 2
tan α = 0.2963
α = tan^(-1) 0.2963
α = 16.504° ≈ 16.5°
The angle of projection is 16° 30`.
Answer:
Centripetal force comes from the Latin, centrum = centre and petere=to seek. It acts perpendicular to the object path, towards the center of the curve. This results in change of the direction of the object's velocity but not in change of object's speed.
So only the first option is correct: It acts at a right angle to the object's motion and causes the object to constantly change direction.
Explanation:
<h3>X-Rays contradict to?</h3>
<h3>C. gamma </h3>
a type of penetrating electromagnetic radiation produced by the radioactive disintegration of atomic nuclei
Speed of ball is 19.80 m/s .
<u>Explanation:</u>
We have , a 2.0 kg ball is resting at the top of a 20 m hill. if the ball rolls down the entire hill,We need to find how fast will it be going.Let's find out:
We know that,
Potential energy : This is the energy possessed by an object due to it's virtue of height and is given by 
, where m is mass , g is acceleration due to gravity & h is height !
Kinetic energy : This is the energy possessed by an object due to it's virtue of motion and is given by 
, where m is mass & v is the velocity of object !
By conservation of energy :
⇒ 
⇒ 
⇒ 
According to question , h=20 m i.e.
⇒ 
⇒ 
⇒ 
Hence , Speed of ball is 19.80 m/s .
Answer:
A-Z
Explanation:
A proton has an estimated weight of 1.
