Answer:
120 V.
Explanation:
From the question given above, the following data were obtained from:
Current (I) = 15 A
Resistance (R) = 8 ohms.
Voltage (V) =.?
From Ohm's law,
V = IR
Where:
V is the voltage.
I is the current.
R is the resistance.
With the above formula, we can obtain the voltage as follow:
Current (I) = 15 A
Resistance (R) = 8 ohms.
Voltage (V) =.?
V = IR
V = 15 × 8
V = 120 V
Therefore, the voltage 120 V.
Answer:
(a) 1.28 m
(b) 0.51 s
Explanation:
Given:
Initial speed, U = 5 m/s
Consideration;
1. When the coin is tossed upward, the coin is moving against gravity. Therefor, the acceleration due to gravity experienced by the coin is negative, -g = -9.8 m/s².
2. The final velocity of the coin in the air is zero.
From equation of motion under free fall,
V² = U² + 2gh
h = ![h = \frac{V^{2} - U^{2}}{2(-g)}](https://tex.z-dn.net/?f=h%20%3D%20%5Cfrac%7BV%5E%7B2%7D%20-%20U%5E%7B2%7D%7D%7B2%28-g%29%7D)
Where;
V is the final velocity
U is the initial velocity
g is the acceleration due to gravity
h is the height
![h = \frac{0^{-25}{19.60}](https://tex.z-dn.net/?f=h%20%3D%20%5Cfrac%7B0%5E%7B-25%7D%7B19.60%7D)
h = 1.2755 m
h = 1.28 m
(b) The coin still has its initial velocity, u to be equal to 5 m/s, final velocity, v to be equal to 0 m/s and acceleration due to gravity to be -9.8 m/s while in the air before returning to the release point.
From equation of motion under free fall,
V = U + gt
![t = \frac{V - U}{g}](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7BV%20-%20U%7D%7Bg%7D)
![t = \frac{0 - 5}{-9.8}](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7B0%20-%205%7D%7B-9.8%7D)
t = 0.51 s
Acceleration = (change in speed) / (time for the change)
Change in speed = (speed at the end) minus (speed at the beginning.
The cart's acceleration is
(0 - 2 m/s) / (0.3 sec)
= ( -2 / 0.3 ) (m/s²) = -(6 and 2/3) m/s² .
Newton's second law of motion says
Force = (mass) x (acceleration) .
For this cart: Force = (1.5 kg) x ( - 6-2/3 m/s²)
= ( - 1.5 x 20/3 ) (kg-m/s²)
<span> = </span>- 10 newtons .
<span>The force is negative because it acts opposite to the direction </span>
<span>in which the cart is moving, it causes a negative acceleration, </span>
<span>and it eventually stops the cart.</span>
Answer:
A) direct sunlight striking Earth
Explanation:
The summer is caused by direct sunlight striking Earth.