The average velocity of an object is given by:
Average velocity = total displacement / total time
First, we calculate the time taken to reach the maximum height of the ball. This occurs when the final velocity is 0.
Vf = Vi + at
0 = 19.6 - 9.81 * t
t = 2 seconds
The total trip will be of 4 seconds (2 seconds up, 2 seconds down)
The total displacement is given by:
s = ut + 1/2 * at²
s = 19.6 * 2 - 0.5 * 9.81 * 2²
s = 19.6 meters
This is the distance maximum height, so the total height is
19.6 * 2 = 39.2 meters
Average velocity = 39.2 / 4
Average velocity = 9.8 m/s
To find food to find each other and to find their way
Answer: 3976N
Explanation:
Using the formula for calculating gravitational force between two masses, we have
F = GMm/r^2
Where G is the gravitational constant
M and m are the masses
r is the distance between the masses
F= 6.673 × 10-¹¹ × 5.98 × 10²⁴ × 63.5/ (6.37 × 10^6)^2
F= 2.533×10^16/6.37×10^12
F= 0.3976×10⁴N
F= 3976N
Answer:
The amount saved in a year is $ 278.6.
Explanation:
current, I = 0.275 A
Voltage, V = 120 V
cost = $ 0.20 per kWh
The energy spent in 1 year is given by
E = V I t
E = 120 x 0.275 x 365 x 24 x 3600
E = 1.04 x 10^9 J
1 kWh = 3.6 x 10^6 J
So,
E = 288.9 kWh
So, the cost is
C = $ 0.2 x 288.9 = $ 57.78
So, the amount saved = $ 336.384 - $ 57.78 = $ 278.6
