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4 years ago

What effect changing voltage and resistance on electric current?

Physics

1 answer:

garik1379 [7]4 years ago

7 0

Ohm's law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.

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A catapult with a radial arm 3.81 m long accelerates a ball of mass 18.2 kg through a quarter circle. The ball leaves the appara

saw5 [17]

Answer:

(a) $\alpha = 53.73 m/s^2$

(b) I =428 $kgm^2$

(c) $\tau = 428 \times 53.73 = 22996 .44Nm$

Explanation:

GIVEN

mass = 18.2 kg

radial arm length = 3.81 m

velocity = 49.8 m/s

mass of arm = 22.6 kg

we know using relation between linear velocity and angular velocity

$\omega = \frac{v}{l}$

$\omega = \frac{49.8}{3.81} \\\omega = 12.99 rad/s$

for angular acceleration, use the following equation.

$\omega _{f}^2 = \omega_{i}^2+2\alpha\theta$

since $\omega _{i} = 0$

here for one circle is 2 π radians. therefore for one quarter of a circle is π/2 radians

so for one quarter $\theta = \frac{\pi }{2}$

$(12.99)^2 = 2\alpha(\frac{\pi }{2})$

on solving

$\alpha = \frac{168.74}{\pi }\\\alpha = 53.73 m/s^2$

(b)

For the catapult,

moment of inertia

$I = \frac{1}{2}MR^2$

$I = \frac{1}{2} \times 22.6\times 3.81 \times 3.81\I = 164kg m^2$

For the ball,

$I = MR^2$

$I = 18.2 \times 14.51$

$I = 264 kgm^2$

so total moment of inertia = 428 $kgm^2$

(c)

$\tau = I\alpha$

$\tau = 428 \times 53.73 = 22996 .44Nm$

3 0

4 years ago

A substance with a density of 16.8 g/ml has a mass of 3.2 g. what is its volume?

wel

We know that d=m/v where d is density, m is mass and v is volume. Lets transform formula to get v in times of d and m
$d= \frac{m}{V} /*V \\ V*d=m /:d \\ V= \frac{m}{d}$
Now we have to substitute our data to formula
V= $\frac{3.2}{16.8}=0.19$ ml - its the answeer

4 0

3 years ago

Read 2 more answers

Given a force of 88 N and an acceleration of 4 m/s2, what is the mass?

WARRIOR [948]

Newton's second law of motion says:

Force = (mass) x (acceleration)

88 = (mass) x (4)

Divide each side by 4 :

Mass = 22 kg.

7 0

4 years ago

What is the weight, in pounds, of a 205-kg object on jupiter?

Crazy boy [7]

<span>a 205 kg mass object will weight 1143.43 lbs on Jupiter. Looking up the surface gravity of Jupiter, you can find that it's 2.53 times that of earth. So the 205 kg object will weigh 205 * 2.53 = 518.65 kg on Jupiter. Now we need to convert from kg to pounds. This is done by multiplying by 2.20462 518.65 kg * 2.20462 lb/kg = 1143.43 lb</span>

4 0

3 years ago

What is the speed of the Curiosity Rover if it travels 10,000 ft. in 25 hours? *

kumpel [21]

I think it’s 250,000 ft./hr

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3 years ago