Answer:
<em>It will cost $20.81</em>
Explanation:
<u>Cost of Electricity</u>
The rate of the cost of electricity is usually expressed in $/KWH because the consumption of electricity is measured in Kilowatts-hour.
If a 25W porch light is on day and night for a full year, the electricity consumption is:
25W*24 H/Day*365 Day/year* 1 year=219,000 WH
converting to KWH: 219,000 WH = 219,000 /1000 KWH = 219 KWH
The rate is $0.095/KWH, thus:
The cost of electricity is 219 KWH*$0.095/KWH= $20.81
It will cost $20.81
Solution
<span>10 mg∙cm/s^2 = 10Kg 10^-6 .10^-2 m /s^2 = 1 Kg 10^1-6-2m / s^2
</span>10 mg∙cm/s^2 = <span>Kg 10^-7 m / s^2
</span>so <span>D. 1 x 10^-7 N</span>
Answer:
Explanation:
Force can be found by multiplying the mass by the acceleration.
The mass of the cart is 3 kilograms and the acceleration is 6 meters per second squared.
Substitute the values into the formula.
Multiply.
- 1 kilogram meter per second squared is equal to 1 Newton.
- Therefore, our answer of 18 kg*m/s² is equal to 18 N
The force exerted is <u>18 Newtons</u>
Answer:
Free-fall is defined as the movement where the only force acting on an object is the gravitational force.
By the second Newton's law, we have that:
F = m*a
Where F = Force, m = mass, a = acceleration.
We can write this as:
a = F/m
And the gravitational force can be written as:
F = (G*M/r^2)*m
Where G is the gravitational constant, M is the mass of the Earth in this case, and r is the distance between both objects (the center of the Earth and the free-falling object)
As the radius of the Earth is really big, the term inside the parentheses is almost constant in the region of interest, then we can write:
G*M/r^2 ≈ g
And the gravitational force is:
F = g*m
And by the second Newton's law we had:
a = F/m = (g*m)/m = g
a = g
Then the acceleration does not depend on the mass of the object.
Then the thing that is common among the free-falling objects is the vertical acceleration.