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3 years ago

Give 3 examples, from the lab, where potential energy was converted to kinetic energy.

Physics

1 answer:

Stella [2.4K]3 years ago

6 0

1. The red ball was potential energy until it was hit by the pendulum converting into kinetic energy.

2. The 5 pounds was a potential energy, until the rope was cut by the scissors, this made the 5 pounds become kinetic energy.

3. The bucket was a potential energy, till the books landed in it causing it to fall, this became kinetic energy

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A resistor is connected to a 36v power supply. An ammeter measures a current of 2.0 A going through it. Determine the resistance

m_a_m_a [10]

R = 18 ohms

Explanation:

Given:

V = 36 volts

I = 2.0 A

R = ?

Use Ohm's law to solve for the resistance:

V = IR

R = V/I

= (36 volts)/(2.0 A)

= 18 ohms

8 0

3 years ago

Which gas law describes the relationship between temperature and pressure at a constant volume

Lelechka [254]

Gay-Lussac's Law: The Pressure Temperature Law

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4 years ago

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Determine the number of bonding electrons and the number of nonbonding electrons in the structure of of2.

Gnoma [55]

OF2 -
O has 6 electrons in outer shell and F has 7 in its outer shell 
Therefore, you have to account for 20 electrons total in the 
structure (7+7+6 = 20) 
therefore draw it linear first. F ---- O-----F 
The two bonds take care of 4 electrons now you have to add another 16. 
Therefore 3 lone pairs on each F and 2 lone pair on O. 
If you check for formal charges, all the atoms are neutral 
F will have 3 lone pairs + 1 bond = 7 electrons (bond = 1/2 electron for formal charge distribution) therefore both the F's are neutral 
Now look at the O: it should have 6.. it has two lone pair and 2 bonds = 4 electrons and 2 bonds = 1 electron each = 2 electrons from bonds = 6 total electrons for formal charge which is exactly the # it should have. There is no need for any double bond in this as there are no charges to be separated. 
Now if u look at the # of domains around O you will see if you include the lone pairs it has a sp3 hybridization (4 domains) therefore a tetrahedron which has 2 lone pairs and 2 bonds.. since there are two lone pairs, the lone pair/bond pair repulsion is so high it is going to repel the two Fluorines and form a bent structure, looks a lot like H2O.

4 0

3 years ago

Read 2 more answers

What is true of a reaction that has reached equilibrium?

grin007 [14]

When a reaction has reached equilibrium, the rate of the forward reaction equals the rate of the reverse reaction, such that the concentrations of reactants and products remain fairly stable, in a chemical reaction. Hope this answers the question. Have a nice day.

4 0

4 years ago

A window has a glass surface of 2907 cm2 and a thickness of 5.6 mm. Find the rate of energy transfer by conduction through this

butalik [34]

Answer:

2.30714 W

-16.38071 W

Explanation:

k = Heat conduction coefficient = 0.8 W/(m·°C)

A = Area = 2907 cm²

l = Thickness = 5.6 mm

$T_2$ = Outside temperature

$T_1$ = Inside temperature

Rate of heat transfer is given by

$Q=\frac{kA(T_2-T_1)}{l}\\\Rightarrow Q=\frac{0.8\times 2907\times 10^{-6}\times (81-71)\times \frac{5}{9}}{5.6\times 10^{-3}}\\\Rightarrow Q=2.30714\ W$

The rate of energy transfer is 2.30714 W

$Q=\frac{kA(T_2-T_1)}{l}\\\Rightarrow Q=\frac{0.8\times 2907\times 10^{-6}\times (0-71)\times \frac{5}{9}}{5.6\times 10^{-3}}\\\Rightarrow Q=-16.38071\ W$

The rate of energy transfer is -16.38071 W

7 0

3 years ago