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3 years ago

3 examples of newtrons 2 law

Physics

1 answer:

frozen [14]3 years ago

7 0

Explanation:

1) Kicking a ball.

2) Capture the ball by hand.

3) Push a car.

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What is the constant acceleration of gravity on earth

Ira Lisetskai [31]

Answer:

9.807 m/s²

Explanation:

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3 years ago

On an aircraft carrier, a jet can be catapulted from 0 to 240

IRISSAK [1]

Answer:

m = 27752.7 [kg]

Explanation:

To solve this problem we must first use the following equation of kinematics.

$v_{f}=v_{o}+a*t$

where:

Vf = final velocity = 240 [km/h]

Vo = initial velocity = 0

a = acceleration [m/s²]

t = time = 2 [s]

But first we must convert the speed from kilometers per hour to meters per second.

$240[\frac{km}{h} ]*(\frac{1h}{3600s} )*(\frac{1000m}{1km} )=66.67[m/s]$

Now replacing:

$66.67 = 0 +a*2\\a = 33.33 [m/s^{2} ]$

Now using Newton's second law which is defined as the product of mass by acceleration we can determine the mass of the jet.

∑F = m*a

$925000=m*33.33\\m = 925000/33.33\\m = 27752.7 [kg]$

4 0

3 years ago

a resistor, of resistance 47 , is damaged when it dissipates a power greater than 0.5W. determine the maximum voltage that can b

harkovskaia [24]

Answer:

The maximum voltage that can be applied without damaging the resistor is 4.85 V

Explanation:

Electric Power in a Resistor

Given a resistor or resistance R connected to a circuit of voltage V carrying a current I. The relation between these three magnitudes is given by Ohm's Law:

V = R.I

The dissipated power P of a resistor can be calculated by the following equation, known as Joule's first law:

$P = I^2.R$

Solving the first equation for I:

$\displaystyle I=\frac{V}{R}$

Substituting in the second equation:

$\displaystyle P=\frac{V^2}{R^2}.R$

Simplifying:

$\displaystyle P=\frac{V^2}{R}$

Solving for V:

$V=\sqrt{P.R}$

The resistor has a resistance of R=47Ω and can hold a maximum power of P=0.5 W, thus the maximum voltage is:

$V=\sqrt{0.5\cdot 47}$

$V=\sqrt{23.5}$

V = 4.85 V

The maximum voltage that can be applied without damaging the resistor is 4.85 V

6 0

3 years ago

Two dogs are pulling a disk, but the disk is not moving. The disk does not move because the forces are (select one: unbalanced,

tiny-mole [99]

Answer:

balanced?

Explanation:

because if it wasn't moving that means they are pulling at a similar strength

8 0

3 years ago

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