Answer:
Time = 0.86 s
Horizontal distance = 3.03 m
Explanation:
Given data:
initial velocity = 
= 3.8 m/s
θ = 22° below with horizontal
Height = h = 4.9 m
a.) Time = t = ?
b.) Horizontal distance = R = ?
a.) First we need to find time of flight
Resolve Velocity into horizontal and vertical component
Horizontal component = 
= Cosθ
= 3.8Cos22°
= 3.52 m/s
Vertical component = 
= Sinθ
= 3.8Sin22°
= 1.42 m/s
Using 2nd equation of motion
4.9 = 1.42t + 4.9t²
the above equation is quadratic. So it has 2 outputs. By solving above equation we have two outputs that is
t = 0.86 s & t = -1.15 s
Time can never be negative ,So the correct answer is t = 0.86 s
t = 0.86s
b.)
As the horizontal component of velocity in projectile motion remain constant, so there is no acceleration along horizontal.
we can simply use this formula
R = 
R = (3.52)(0.86)
R = 3.03 m
Answer:
Plane mirrors work because the light rays create a virtual image behind the mirror. Light rays from the object strike the mirror and reflect according to the law of reflection. ... Therefore, our eye and brain track the light rays backward to a position from which they appear to have come.
Answer:
Yes, I think
Explanation:
Melting is a process that causes a substance to change from a solid to a liquid. Melting occurs when the molecules of a solid speed up enough that the motion overcomes the attractions so that the molecules can move past each other as a liquid.
Answer:
28.79%
Explanation:
Given
Design Speed, V = 120km/h = 33.33m/s
Radius, R = 300m
Side Friction, Fs = 0.09
Gravitational Constant = 9.8m/s²
Using the following formula, we'll solve the required rate of superelevation.
e + Fs = V²/gR where e = rate
e = V²/gR - Fs
e = (33.33)²/(9.8 * 300) - 0.09
e = 0.287853367346938
e = 28.79%
Hence, the required rate of superelevation for the curve is calculated as 28.79%
