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Alexandra [31]
3 years ago
5

Um avião, após deslocar-se 120 km para nordeste (NE), desloca-se 160 km para sudeste (SE). Sendo um quarto de hora o tempo total

dessa viagem, o módulo da velocidade vetorial média do avião, nesse tempo, foi de A) 320 km/h. B) 480 km/h. C) 540 km/h. D) 640 km/h. E) 800 km/h.
Physics
1 answer:
Svetach [21]3 years ago
4 0

Answer:

E) 800 km/h

Explanation:

The computation of the average vector velocity module of the plane, at that time is shown below:

The displacement vector is

d^2 = d1^2 + d2^2

where,

d1 = northeast displacement

d2 = southeast displacement

Now

d^2 = (120)^2 + (160)^2

= 14400 + 2560

= 40000

= √40000

d = 200 km

Now the average velocity is

V = ΔS ÷ Δt

= 200 ÷ 1 ÷ 4

= 200 × 4

=  800 km/h

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A lamp with a resistance of 60 Ohms is plugged into a 110-Volt household circuit. How much current flows through the lamp?
Mrac [35]

The current flowing through the lamp is  1.833A

<h3>What is current?</h3>

The current is the stream of charges which flow inside the conductors when connected across the end of voltage.

From the Ohm's law, V =IR

Here, R is the proportionality constant called resistance of the resistor

A lamp with a resistance of 60 Ohms is plugged into a 110-Volt household circuit.

I = V/R

Put the values, we get

I = 110/60

I = 1.833A

Thus, the current flowing through the lamp is  1.833A

Learn more about current.

brainly.com/question/10677063

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6 0
2 years ago
A 29.0-kg block is initially at rest on a horizontal surface. A horizontal force of 71.0 N is required to set the block in motio
Julli [10]

Answer:

(a) \mu_s=0.25

(b) \mu_k=0.20

Explanation:

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\sum F_y:N=mg\\\sum F_x:F_a=F_f

Recall that the frictional force is related jointly with the coefficient of friction and normal force F_f=\mu N. Replacing in the above equation, we get the coefficient of friction:

F_a=\mu N=\mu mg\\\mu=\frac{F_a}{mg}

(a) The  coefficient of static friction is related with the force required to set the block in motion:

\mu_s=\frac{71N}{29kg*9.8\frac{m}{s^2}}\\\mu_s=0.25

(b) The  coefficient of kinetic friction is related with the force required to keep the block moving with constant speed:

\mu_k=\frac{56N}{29kg*9.8\frac{m}{s^2}}\\\mu_k=0.20

3 0
3 years ago
Large electric fields in cell membranes cause ions to move through the cell wall. The field strength in a typical membrane is 1.
serg [7]

Explanation:

The given data is as follows.

          Electric field (E) = 1 \times 10^{7} N/C

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Formula to calculate the magnitude of force is as follows.

                F = qE

                   = 1.6 \times 10^{-19} \times 1 \times 10^{7} N/C

                   = 1.6 \times 10^{-12} N

Therefore, we can conclude that magnitude of the force on a calcium ion with charge +e is  1.6 \times 10^{-12} N.

6 0
3 years ago
Unpolarized light shines pon a photocell for one hour. then, two polarizers, whose transmission axies are offset by 60, are plac
LenaWriter [7]

Answer:

  t = 1.10 h

Explanation:

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         I = I₀ 0.907

This is the intensity that reaches the cell

To find time, use an inverse proportion rule or rule of three, the intensity Io in

        t = I₀ / (0.907 I₀) 1 h

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8 0
3 years ago
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Roman55 [17]
The number of protons determines the element. Many elements also have many isotopes. Such as carbon-14 Carbon-12 and carbon-10.
4 0
3 years ago
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