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3 years ago

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A. What is the coefficient of kinetic friction?

1 answer:

Andrews [41]3 years ago

7 0

Explanation:

Coefficient of kinetic friction is the resistive force that opposes the motion of a body as it moves and is in contact with another body.

It is found by dividing the frictional force by the normal force.

Friction is a force that opposes motion.
Static friction is for bodies that are not in motion
Kinetic friction is for moving bodies.

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. Common household appliances are rated at 110 V, but power companies deliver voltage in the kilovolt range and then step the vo

natulia [17]

Answer: High voltage transmission minimizes energy losses during electricity transmission.

Explanation:

When electricity is to be transmitted over a long distance, high voltage transmission is preferred to minimize energy losses due to heat.

The higher the transmission voltage, the lower the current and the lesser the resitance in the wire and the lesser the energy lost due to heat during transmission.

High voltage transmission in kilowatts enables light weight cables to be used for long distance electricity transmission.

This explains why, even though only 110 V may be required at home by some appliances, but electricity is transmitted in kilovolts and often require a stepdown transformer

8 0

3 years ago

Two ice skaters collide on the ice. A 39.6-kg skater moving South at 6.21 m/s collides with a 52.1-kg skater moving East at 4.33

Stells [14]

Answer:

V = 3.6385 m/s

θ = 47.46 degrees

Explanation:

the important data in the question is:

Skater 1:

$M_1$ = 39.6 kg

direction: south (axis y)

$V_{1iy}$ = 6.21 m/s

Skater 2:

$M_2$ = 52.1 kg

direction: east (axis x)

$V_{2ix}$ = 4.33 m/s

Now using the law of the conservation of linear momentum ( $P_i = P_f$ and knowing that the collision is inelastic we can do the next equations:

$M_{1}V_{1ix}+M_2V_{2ix} = V_{sx}(M_1+M_2)$ (eq. 1)

$M_{1}V_{1iy}+M_2V_{2iy} = V_{sy}(M_1+M_2)$ (eq. 2)

Where $V_{sx}$ and $V_{sy}$ is the velocity of the sistem in x and y after the collision.

Note: the conservation of the linear momentum have to be make once by each axis.

Now, in the (eq. 1) the skater 1 don't have velocity in the axis x, so we can replace $V_{1ix}$ by 0 in the equation and get:

$M_2V_{2ix} = V_{sx}(M_1+M_2)$ (eq. 1)

also, in the (eq. 2) the skater 2 don't have velocity in the axis y, so we can replace $V_{2iy}$ by 0 in the equation and get:

$M_{1}V_{1iy} = V_{sy}(M_1+M_2)$ (eq. 2)

Now, we just replace the data in both equations:

$(52.1)(4.33) = V_{sx}(39.6+52.1)$ (eq. 1)

$(39.6)(6.21) = V_{sy}(39.6+52.1)$ (eq. 2)

solving for $V_{sx]$ and $V_{sy}$ we have:

$V_{sx]$ = 2.46 m/s

$V_{sy]$ = 2.681 m/s

using the pythagoras theorem we can find the magnitude of the velocity as:

V = $\sqrt{2.46^2+2.681^2}$

V = 3.6385 m/s

For find the direction we just need to do this;

θ = $tan^{-1}(\frac{2.681}{1.46})$

θ = 47.46 degrees

3 0

3 years ago

Consider two positively charged particles, one of charge q0 (particle 0) fixed at the origin, and another of charge q1 (particle

charle [14.2K]

Answer:

F12= (kq1q2/r12 squared)*e12

Explanation:

F12→ is the force q 1 makes on q 2 and e12 is the unit vector from q1 toward q2.

8 0

3 years ago

Both sections of rod ABC are circular and solid with diameters d 100 mm AB = and d 50 mm BC = . Determine the maximum shear stre

xz_007 [3.2K]

Answer:

814.87 kPa

Explanation:

See the attached picture for detailed answer.

5 0

3 years ago

A baseball is thrown a distance of 17.2 m What is its speed if it takes 0.56 seconds to cover the distance?

lubasha [3.4K]

Answer:

v = (S2 - S1) / t = 17.2 m / .56 s = 30.7 m/s

This is about 100 ft/sec or 69 mph

7 0

3 years ago