Answer:
Explanation:
At the top , horizontal displacement = 2 m .
vertical displacement = 1.5 m .
Let time to reach the hole be t . Let the ball is launched at angle θ with horizontal with velocity u .
ucosθ x t = 2
from v = u - 2gt
0 = usinθ - 2gt
usinθ = 2gt
v² = u² - 2gh
u²sin²θ = 2 g h
u²sin²θ = 2 x 9.8 x 1.5
usinθ = 5.42
usinθ = 2gt
2gt = 5.42
t = .2765 s
ucosθ x t = 2
ucosθ x .2765 = 2
ucosθ = 7.23
usinθ = 5.42
dividing ,
Tanθ = .75
θ = 37°
usin37 = 5.42
u = 9.03 m /s
Answer:
c. (H-h/2) above the ground
Explanation:
The mirror must be at least half as tall as the alien, and its base must be located at half of the distance between the alien's eyes and the ground (assuming that the alien doesn't float or levitate).
This question is about the Law of Reflection which states that the angle of reflection = angle of incidence.
I attached an image that can help you understand the concept, although the alien is not included.
Answer:
C
Explanation:
The electric field inside a conductor is always zero if the charges inside the conductor are not moving.
Since the electron are not moving then they must be in electrostatic equilibrium which means the electric field inside the conductor is zero. if the electric field existed inside the conductor then there will be net force on all the electrons and the electrons will accelerate.
A liquid is a matter that neither has a fixed shape but fixed volume...in college really need to know this.
GOOD LUCK