Answer:
I = 1.09 A
Explanation:
Here, 5 ohm and 12 ohm resistor are connected in parallel. Using the parallel combination of resistors as follows :
Now R and 2 ohm resistors are in series. Let the equivalent be . So,
Let I be the current. Using Ohm's law,
V = IR
or
I = 1.09 A
So, the correct option is (c).
1. The time taken for the body to fall to ground is 4 s
2. The vertical component of the velocity when the body falls to the ground is 39.2 m/s
3. The distance from the rock when it strick the ground 10m/s is 40 m
<h3>1. How to determine the time </h3>
- Height (h) = 80 m
- Horizontal velocity = 20 m/s
- Time (t) =?
h = ut
80 = 20 × t
Divide both sides by 20
t = 80 / 20
t = 4 s
Thus, it will take the body 4 s to land on the ground.
<h3>2. How to determine the vertical component of the velocity</h3>
- Time (t) = 4 s
- Acceleration due to gravity (g) = 9.8 m/s²
- Velocity (v) =?
v = gt
v = 9.8 × 4
v = 39.2 m/s
<h3>3. How to deteremine the distance</h3>
- Horizontal velocity = 10 m/s
- Time (t) = 4 s
- Horizontal distance (s) =?
s = ut
s = 10 × 4
s = 40 m
Learn more about motion under gravity:
brainly.com/question/20385439
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A waves frequency (in Hertz) is how many crests pass by a point per second. easily confused with period, which is the amount of time it takes for a full wave to pass by a certain point
Answer:
a) 6.26 m/s
b) 7.67 m/s
Explanation:
The potential energy at height h0 is initially ...
PE0 = mgh0
At height h1, the potential energy is ...
PE1 = mgh1
The difference in potential energy is converted to kinetic energy:
PE0 -PE1 = KE1 = (1/2)m(v1)^2
Solving for v1, we have ...
mg(h0 -h1) = (1/2)m(v1)^2
2g(h0 -h1) = (v1)^2
v1 = √(2g(h0 -h1))
__
a) When the body is 1 m high, its speed is ...
v = √(2(9.8)(3 -1)) ≈ 6.26 m/s . . . at 1 m high
__
b) When the body is 0 m high, its speed is ...
v = √(2(9.8)(3 -0)) ≈ 7.67 m/s . . . when it reaches the ground