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3 years ago

Galilee said that if you rolled a ball along a level surface it would be

Physics

1 answer:

kodGreya [7K]3 years ago

4 0

It would <span>keep rolling without slowing down if no friction acted upon it.

</span>

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6. Two light bulbs are designed for use at 120 V and are rated at 75 W and 150 W. Which light bulb has the greater filament resi

Nonamiya [84]

$\\ \bull\tt\longrightarrow P=\dfrac{V^2}{R}$

P is power
R is resistance

$\\ \bull\tt\longrightarrow R=\dfrac{V^2}{P}$

Hence

$\\ \bull\tt\longrightarrow R\propto V$

$\\ \bull\tt\longrightarrow R\propto \dfrac{1}{P}$

Therefore if power is low then resistance will be high.

The first bulb has less power hence it has greater filament resistance.

5 0

3 years ago

If an electric current of 8.50 A flows for 3.75 hours through an electrolytic cell containing copper-sulfate (CuSO4) solution, t

muminat

Answer:

75.5g

Explanation:

From the ionic equation, we can write

$CU^{2+}+SO^{2-}_{4}\\$

next we find the number of charge

Note Q=it

for i=8.5A, t=3.75 to secs 3.75*60*60=13500secs

hence

$Q=8.5*13500\\Q=114750C$

Since one faraday represent one mole of electron which equal 96500C

Hence the number of mole produced by 114750C is

114750/96500=1.2mol

The mass of copper produced is

$mol=\frac{mass}{molar mass} \\mass=mole*molar mass\\mass=1.2*63.5\\mass=75.5g$

Hence the amount of copper produced is 75.5g

7 0

3 years ago

Read 2 more answers

A train travels 85 kilometers in 5 hours, and then 63 kilometers in 5 hours what is its average speed?

Lesechka [4]

We know average speed =total distance/time taken
So avg speed=(85+63)/(5+5)=14.8km/hr

3 0

4 years ago

Consider an object rolling off of your lab bench. Discuss how you might be able to make measure- ments to determine its initial

guapka [62]

Answer:

measure the position every so often with a stopwatch

Explanation:

A possible method of measurement is to place a measuring tape along the path and measure the position every so often with a stopwatch, with this we can make a graph of position against time and by extrapolation find the initial velocity.

This is a method used in measurements of uniform movements of bodies

7 0

3 years ago

A 15.0 volt storage battery is connected to three resistors, 7.75?, 15.5?, and 21.7?, respectively. the resistors are joined in

Rainbow [258]

Total resistance= 7.75+15.5+21.7=44.95
Current = 15V/44.95=0.334A

4 0

3 years ago