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3 years ago

3. Tabulate the difference between a Static friction and Kinetic friction.

Physics

1 answer:

Phantasy [73]3 years ago

7 0

Answer:

Static friction is what keeps the box from moving without being pushed, and it must be overcome with a sufficient opposing force before the box will move. Kinetic friction is the force that resists the relative movement of the surfaces once they're in motion.

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A solenoidal inductor for a printed circuit board is being redesigned. To save weight, the number of turns is reduced by one-fif

AlladinOne [14]

The "it must be five times larger" current change if the energy stored in the inductor is to remain the same.

<u>Explanation:</u>

A current produced by a modifying magnetic field in a conductor is proportional to the magnetic field change rate named INDUCTANCE (L). The expression for the Energy Stored, that equation is given by:

$U= \frac{1}{2} LI^2$

Here L is the inductance and I is the current.

Here, energy stored (U) is proportional to the number of turns (N) and the current (I).

$L = \frac{\mu_0 N^2 *A}{l}$

mu not - permeability of core material

A -area of cross section

l - length

N - no. of turns in solenoid inductor

Now,given that the proportion always remains same:

$\frac{N_2}{N_1} = \frac{I_1}{I_2}$

In this way the expression

$\frac{1}{5} = \frac{I_1}{I_2}$

$I_2 = I_1 \times 5$

Thus, it suggest that "it must be five times larger" current change if the energy stored in the inductor is to remain the same.

8 0

4 years ago

If a person has a dangerously high fever, submerging her in ice water is a bad idea, but an ice pack can help to quickly bring h

Elenna [48]

Answer:

775 grams of ice

Explanation:

Heat loss by patient = heat gained by ice

Heat loss by patient = mass×specific heat capacity×(initial temperature - final temperature) = 62×4200×(40-39) = 260,400J

Heat gained by ice = mass × specific latent heat of fusion of ice = m×336000 = 336000m J

336000m = 260,400

m = 260400/336000 = 0.775kg = 0.775×1000 grams = 775 grams of ice

7 0

4 years ago

The football player throws the football with an initial diagonal velocity of 17 m/s at an

ArbitrLikvidat [17]

17 Sin (45) in the vertical and 17 Cos
(45)

8 0

4 years ago

How do I find the tension? its supposed to be in the mid 40s

babunello [35]

Answer:

a = 2.3 m/s²

T = 45 N

Explanation:

Draw a free body diagram for each mass.

For the mass on the incline, there are four forces:

Weight force mg pulling down.

Normal force N perpendicular to the incline.

Friction force Nμ pushing down the incline.

Tension force T pulling up the incline.

For the hanging mass, there are two forces:

Weight force Mg pulling down.

Tension force T pulling up.

Sum of the forces on the hanging mass in the -y direction:

∑F = ma

Mg − T = Ma

T = Mg − Ma

Sum of the forces on the sliding mass in the perpendicular direction:

∑F = ma

N − mg cos θ = 0

N = mg cos θ

Sum of the forces on the sliding mass in the parallel direction:

∑F = ma

T − mg sin θ − Nμ = ma

Substitute:

Mg − Ma − mg sin θ − mgμ cos θ = ma

Mg − mg (sin θ + μ cos θ) = ma + Ma

Mg − mg (sin θ + μ cos θ) = (m + M) a

a = [ Mg − mg (sin θ + μ cos θ) ] / (m + M)

Plug in values:

a = [ 6.0×9.8 − 5.0×9.8 (sin 30° + 0.20 cos 30°) ] / (5.0 + 6.0)

a = 2.3 m/s²

Now find tension:

T = Mg − Ma

T = 6.0×9.8 − 6.0×2.3

T = 45 N

3 0

4 years ago

aluminum has a density of 2.70 gm/cm cubed. what is the mass of a peice of alluminum that has a volume of 100.00 cm cubed

Vesna [10]

density=2.70

volume=100

mass=density*volume

so,

2.7*100=270

mass is 270gram

7 0

3 years ago

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3. Tabulate the difference between a Static friction and Kinetic friction.​

3. Tabulate the difference between a Static friction and Kinetic friction.