The picture below shows a person swinging a yo-yo in a circle. Which vector shows the velocity of the yo-yo at this moment?

Physics

1 answer:

igor_vitrenko [27]3 years ago

6 0

C, at this moment it is directly 90 degrees to the right and is only travelling downwards

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A coin is placed 32 cm from the center of a horizontal turntable, initially at rest. The turntable then begins to rotate. When t

pashok25 [27]

Answer:

0.39

Explanation:

distance from the center (r) = 32 cm = 0.32 m

speed of the coin (v) = 110 cm/s = 1.1 m/s

acceleration due to gravity (g) = 980 m/s^{2} = 9.8 m/s^{2}

find the coefficient of static friction (k) between the coin and the turn table

frictional force = kmg

before the table begins to move, the frictional force balances the centripetal force ( $\frac{mv^{2} }{r}$ )

therefore

frictional force = centripetal force

kmg = $\frac{mv^{2} }{r}$

kg = $\frac{v^{2} }{r}$

k = $\frac{v^{2} }{r}$ ÷ g

k = $\frac{1.1^{2} }{0.32}$ ÷ 9.8 = 0.39

6 0

3 years ago

What would we need to know to calculate both work and power?

8_murik_8 [283]

b. force, distance, time

The equation for Work = Force * Distance

The equation for Power = Work / Time = Force * Distance / Time

8 0

3 years ago

Read 2 more answers

Please help which one is correct

Natalija [7]

Answer:

option (i) is correct

Explanation:

as there is no air resistance, no force is acting on the object horizontally, but gravitational acceleration will obviously act, regardless of the air resistance... option (i) is correct

8 0

3 years ago

Two infinite wires 20 cm apart each carry a current of 3 A into the paper. d I I d/2 d/2 At a distance d 2 below their midpoint,

Rzqust [24]

<u>Answer:</u>

<h3>As electric current is carried in a cable, around it, a magnetic field is created. The lines of the magnetic fields form concentric circles around the wire. The direction of the magnetic field hinges on the direction of the current. It can be calculated by pointing the thumb of your right hand in the direction of the moment, using the "right hand law." The position of your curled fingers is in the magnetic field lines. The magnetic field magnitude depends on the sum of current, and the distance from the wire carrying the charge.</h3>

<u></u>

<u>Explanation:</u>

Determine the direction of vector B magnitude B: $B: B=\mu_{0} * 1 /(2 \pi r): r=d / 2 * \sqrt{2}$