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adelina 88 [10]
3 years ago
11

Kinetic energy depends on the height of an object above the ground?

Physics
1 answer:
s344n2d4d5 [400]3 years ago
5 0
Annnnd? Ummmmmmmmmmmmmmm
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Which words describe the composition of the inner planets ? Select three options,
IgorLugansk [536]

Answer:a b c

Explanation: I’m not sure tho

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3 years ago
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A ball strikes a wall. It exerts a force of 10 N to the left against the wall and bounces off. What force does the wall exert on
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The wall exerts a force of equal magnitude but in the opposite direction. So the force by the wall is 10 N to the right.
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If one 9V battery is used in a circuit with a total resistance of 39Ω, what is the current in the circuit?
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Using V= IR

I= 0.2307 Ampere

6 0
2 years ago
In a simple RC circuit, at t=0 the switch is closed with the capacitor uncharged. If C=30µF, =50V and R=10k, what is the poten
sergij07 [2.7K]

Answer:

Voltage across the capacitor is 30 V and rate of energy across the capacitor is 0.06 W

Explanation:

As we know that the current in the circuit at given instant of time is

i = 2.0 mA

R = 10 k ohm

now we know by ohm's law

V = iR

V = (2 mA)(10 kohm)

V = 20 volts

so voltage across the capacitor + voltage across resistor = V

V_c + 20 = 50

V_c = 30 V

Now we know that

U = \frac{q^2}{2C}

here rate of change in energy of the capacitor is given as

\frac{dU}{dt} = \frac{q}{C} \frac{dq}{dt}

\frac{dU}{dt} = (30)(2 mA)

\frac{dU}{dt} = 0.06 W

3 0
3 years ago
an athlete in a hammer-throw event swings a 7.0-kilogram hammer in a horizontal circle at a constant speed of 12 meters per seco
Semenov [28]

Answer:

ac = 72 m/s²

Fc = 504 N

Explanation:

We can find the centripetal acceleration of the hammer by using the following formula:

a_c = \frac{v^2}{r}

where,

ac = centripetal acceleration = ?

v = constant speed = 12 m/s

r = radius = 2 m

Therefore,

a_c = \frac{(12\ m/s)^2}{2\ m}

<u>ac = 72 m/s²</u>

<u></u>

Now, the centripetal force applied by the athlete on the hammer will be:

F_c = ma_c\\F_c = (7\ kg)(72\ m/s^2)

<u>Fc = 504 N</u>

6 0
2 years ago
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