Answer:
Answer:
71.6°
Explanation:
According to the diagram
ED = 6 feet
DA = EB = 3 feet
AC = 15 feet
AB = ED = 6 feet
BC = AC - AB = 15 - 6 = 9 feet
Let the angle is θ from the horizontal
By the triangle EBC
tanθ = BC / EB = 9 / 3
tanθ = 3
θ = 71.6°
Thus, the angle from the horizontal is 71.6°.
Explanation:
The plus direction is going to go with the 10N to the right. Since the second force is applied in exactly the opposite direction, the net force 10 - 3 = 7 newtons to the right.
Answer:
Explanation:
energy density can be obtained as
Where,
E is electric field
K COLOUMB CONSTANT =8.99*10^{9} N -m2 /C2
Q is charge = CV
C is capacitance =
for r = 10.6 cm
E = 2568.34 N/C
Answer:
Explanation: A boy sitting on a chair.. Assuming the boy has a weight of 50N and he sits on the chair. He will exert a downward force of +50N while the chair will exert an upward force of -50N. This shows that for every action there must be equal and opposite reaction.. Another example is when you recoil a gun
Answer:
A. potential energy is 258720 Joule
Explanation:
A.Gravitational potential energy is: PE = m × g × h
velocity = 15.33 m/s when the car reaches the bottom of the hill.
where, m = mass
g = acceleration due to gravity
h = height from the bottom of hill.
The potential energy is : m×g×h
=(2200×9.8×12)
=258720 Joule
B. at the bottom of the hill, the potential energy is converted into kinetic energy so PE at top = KE at bottom
kinetic energy= ()
where v = velocity
m= mass
therefore, v=
or, v=
or, v=15.33 m/s