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levacccp [35]
3 years ago
5

An auto race takes place on a circular track. A car completes one lap in a time of 18.0 s, with an average tangential speed of 4

3.4 m/s. Find the average angular speed and the radius of the track.
(a) the average angular speed
rad/s

(b) the radius of the track
m
Physics
1 answer:
eduard3 years ago
4 0

Answer:

(A) 0.3488 rad/sec

(B) 124.246 m                

Explanation:

We have given car completes one revolution in 18 sec'

So time period T= 18 sec

Tangential speed v = 43.4 m/sec

(A) Angular velocity is given by \omega =\frac{2\pi }{T}=\frac{2\times 3.14}{18}=0.3488rad/sec

(B) Tangential velocity is given v = 43.4 m /sec

We know that v=\omega r

r=\frac{v}{\omega }=\frac{43.4}{0.3488}=124.426m

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The power dissipated in a resistor is given by P = V 2 / R , which means power decreases if resistance increases. Yet this power
klasskru [66]

Answer:

Explanation:

Power Dissipated in a resistor is given by two methods i.e.

P=\frac{V^2}{R}  and

P=I^2\cdot R

where V=Potential\ difference

R=resistor

I=current

both formula gives Power but Former is used when voltage is constant i.e. when resistors are in parallel and the later is used when the resistor are in series .

Though P=\frac{V^2}{R} can also be used in series but we have to calculate the Potential drop across each resistor then we can apply the formula.

Similar is with P=I^2R

First we have to calculate current through each resistor then we can apply the Formula

5 0
3 years ago
a block of wood is found to have dimensions of 6.21 cm x 4.63 cm x 5.34 cm. Calculate the volume of the block
34kurt

Answer:

153.54 cm³

Explanation:

The formula for the volume of a cube is v = lwh, where l is the length, w is the width, and h is the height of the block.  Multiply, 6.21*4.63*5.34 = 153.54

7 0
3 years ago
Running with an initial velocity of +11m/s, a horse has an average acceleration of -1.81m/s 2 . How long does it take for the ho
Ronch [10]

Answer:

2.49 seconds

Explanation:

From the question,

a = (v-u)/t............................ Equation 1

Where a = acceleration, v = final velocity, u = initial velocity, t = time

Make t the subject of the equation

t = (v-u)/a.......................... Equation 2

Given: v = 6.5 m/s, u = 11 m/s, a = -1.81 m/s²

Substitute these values into equation 2

t = (6.5-11)/(-1.81)

t = -4.5/-1.81

t = 2.49 s

6 0
3 years ago
What formula gives the strength of an electric field, E, at a distance from a known source charge?
Deffense [45]
<h2>Hello!</h2>

The answer is: Coulomb's law equation.

<h2>Why?</h2>

The Coulomb's law states that the strength of an electric field (between two charges) can be calculated by multiplying their charges and dividing it into the square of the distance between their centers.

E=\frac{k*q*Q}{d^{2} }

Where:

E = Electric Field Strenght

k=9.0*10^{9}  \frac{N.m^{2} }{C^{2} }

q=TestCharge\\Q=SourceCharge\\

d = separation between charges (m)

Have a nice day!

5 0
4 years ago
Read 2 more answers
How can u use physics in the real world
Blizzard [7]
Physics can be used in a variety of ways, a specific example would be rollercoaster. Physics can be used to determine the speed at which a rollercoaster can travel without going off the rails or when it needs to begin to slow down to make a sharp turn.
3 0
4 years ago
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