A snowball that will be used to build a snowman is at the top of a only hill. If the
1 answer:
Answer:
h = 24.11 m
Explanation:
Given that,
The potential energy of the snowball is 520 J
The mass of the snowball is 2.2 kg
We need to find the height of the hill. The potential energy of an object is given by the formula as follows :
g is acceleration due to gravity
h is height of the hill
So, the height of the hill is 24.11 m.
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Answer:
On 7.8 acres there are 31565.3 square meters
7.8 acres = 31565.3 m²
Explanation:
Conceptual analysis
Acre, square mile and square meter are area units, so their equivalences are in square units.
Known data
1 (mi)² = 640 acres
1 mi = 1609.34 m
Problem development
We know that 1 mile = 1609.34m, then: (1 mile)² = (1609.34m)²=(1609.34)²m²
We apply the known conversion factors to calculate the square meters (X) in 7.8 acres:
We eliminate acres and square miles (mi²) because they are in the numerator and denominator, so the answer is in square meters (m²)
X=31565.3 m²
On 7.8 acres there are 31565.3 square meters
7.8 acres = 31565.3 m²
Answer:
The current in a resistor decreases by a factor of 4.
Explanation:
I =
Where (I) is the current, (E) is the voltage and (R) is the resistance.
Decreasing the voltage by 4 gives;
I = 0.25
Since you have multiplied by 0.25,
You have to multiply I by 0.25 so the current decreases by a factor of 4.
Lets us consider an example:
Suppose a 10 ohm bulb is connected across the terminals of a 10 V
battery having 2ohm internal resistance.
Then total reistance in series we know, R1 + R2
Thus, R net = 10+ 2 = 12 ohm
The, current across circuit = 10/12= 0.833 A
Now, Power is given by
Thus, power dissipated across internal resistance, P =
And, total power dissipated =
Thsu, percentage of pwer not avaible = 1.37/8.2 = 16.70%