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faltersainse [42]

3 years ago

11

A model shows a machine that works using electrical fields. What would this machine need for the electrical field to function pr

operly?

1 answer:

Alex3 years ago

7 0

at least two charged interacting parts

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ou are pushing a 20-kg box along a horizontal floor. Friction acts on the box. When you apply a horizontal force of magnitude 48

ziro4ka [17]

Answer:

The magnitude of the frictional force is 48.02 N

Explanation:

Mass of box = 20 kg

Weight of the box (Normal reaction) = mass × acceleration due to gravity = 20 ×9.8 = 196 N

Horizontal force applied = 48 N

Coefficient of friction = horizontal force ÷ normal reaction = 48 ÷ 196 = 0.245

Frictional force = coefficient of friction × normal reaction = 0.245 × 196 N = 48.02 N

5 0

3 years ago

Read 2 more answers

Let's begin with the angular acceleration of a compact disk (CD). To play music the CD must rotate at high speed while a laser r

aliya0001 [1]

Answer:

$\omega = 754 rad/s$

$t = 6.6 \times 10^{-4} s$

$\alpha = 188.5 rad/s^2$

Explanation:

Frequency of the disc is given by the

$f = 7200 rev/min$

here we know that

$f = \frac{7200}{60} rev/s$

$f = 120 rev/s$

now we have

$\omega = 2\pi f$

$\omega = 2\pi(120) = 754 rad/s$

Now we know that its angular speed is 754 rad/s

now to find the time to turn by 90 degree is given as

$t = \frac{\theta}{\omega}$

$t = \frac{\pi/2}{740} = 6.6 \times 10^{-4} s$

Now the angular acceleration is given as

$\alpha = \frac{\omega_f - \omega_i}{t}$

$\alpha = \frac{240\pi - 0}{4}$

$\alpha = 188.5 rad/s^2$

5 0

4 years ago

Hệ thống điện bao gồm những phần tử nào

zubka84 [21]

Ÿ cd fsvjcfddgfweggbvvsś

7 0

3 years ago

How are EM waves and Mechanical waves different? * Check all that apply 5 points EM waves can travel through a vacuum. All EM wa

Ludmilka [50]

Particles transfer energy physically from one to the other either horizontally in a longitudinal wave, vertically in a transverse wave, or in circles in a surface wave. Waves can also be electromagnetic, which are always transverse and do not require a medium to propagate, like light waves traveling through space.

6 0

3 years ago

Calculate the heat energy required to increase the temperature of 3 kg of water by 20ºC. The specific heat capacity of water is

Marina86 [1]

Answer:

Heat energy required = 252000J or 252KJ.

Explanation:

<u>Given the following data;</u>

Mass = 3kg

Temperature = 20ºC

Specific heat capacity of water = 4200 J/kg°C

To find the heat energy required;

Heat capacity is given by the formula;

$Q = mct$

Where;

Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
t represents the temperature.

Substituting into the equation, we have;

$Q = 3*4200*20$

Q = 252000 Joules or 252 Kilojoules.

6 0

3 years ago