Answer:
The actual angle is 30°
Explanation:
<h2>Equation of projectile:</h2><h2>y axis:</h2>
the velocity is Zero when the projectile reach in the maximum altitude:
When the time is vo/g the projectile are in the middle of the range.
<h2>x axis:</h2>
R=Range
**sin(2A)=2sin(A)cos(A)
<h2>The maximum range occurs when A=45°
(because sin(90°)=1)</h2><h2>The actual range R'=(2/√3)R:</h2>
Let B the actual angle of projectile
2B=60°
B=30°
The speed is 16.2 m/s
Explanation:
Assuming the runner is moving by uniform motion (=at constant velocity), then we can find his speed by using the equation:
where
v is the speed
d is the distance covered
t is the time elapsed
For the runner in this problem, we have:
The initial position is 10 m while the final position is 80 metres, so the distance covered is
d = 80 - 10 = 70 m
While the time elapsed to cover these 70 m is
t = 4.32 s
Therefore, substituting into the equation, we find the speed:
Learn more about speed:
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Explanation:
Downstream: you just sum the magnitude of the velocity vectors:
3km/h + 4km/h = 7km/h
Upstream: difference of the magnitudes of the velocity vectors, in absolute value:
|3km/h - 4km/h| = 1km/h
Answer: A planet orbit is a gravitationally curved path that a celestial body travels around a point in space.
Explanation:
We define planet orbit as the path that a planet (or any other celestial object) has around two focal points (the orbit is an ellipse, the ellipses have two focal points). For example, the moon's orbit is around the Earth is almost circular, while Earth orbit is less circular. This movement is caused by the strong gravitational attraction of the sun, that keeps all the planets fixed in the orbits, this is why this is called a "gravitationally curved path".
the correct option is planet orbit.