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Reptile [31]
3 years ago
9

Which lanthanide forms a compound that enables you to see red on acomputer screen!​

Physics
1 answer:
jeka943 years ago
5 0

Answer:

Europium

Explanation:

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A person riding on a bus hears the horn of a car that the bus is approaching. After the bus passes the car and is traveling away
Grace [21]

Answer:

option (c)

Explanation:

According to the doppler's effect, the frequency of sound decreases.

If there is a relative motion between the source and the observer, the frequency of sound changes apparently.

the formula of the doppler effect is given by

f' =\frac{v-v_{o}}{v}}f

where, f is the real frequency, v be the speed of sound, vo be the speed of the observer, here, the bus is the observer.

So, the value of f' < f

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3 years ago
Car manufacturers use radiation for wich task?
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Drying paint for edgenuity
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4 years ago
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The drawing shows a hydraulic chamber with a spring (spring constant = 1600 N/m) attached to the input piston and a rock of mass
Triss [41]

Answer:

\Delta x=245\ mm

Explanation:

Given:

  • spring constant of the spring attached to the input piston, k=1600\ N.m^{-1}
  • mass subjected to the output plunger, m=40\ kg

<u>Now, the force due to the mass:</u>

F=m.g

F=40\times 9.8

F=392\ N

<u>Compression in Spring:</u>

\Delta x=\frac{F}{k}

\Delta x=\frac{392}{1600}

\Delta x=0.245\ m

or

\Delta x=245\ mm

8 0
4 years ago
A 1 000-V battery, a 3 000-Ω resistor, and a 0.50-μF capacitor are connected in series with a switch. The time constant for such
vampirchik [111]

Answer:

The current in the circuit at a time interval of τ seconds after the switch has been closed is 0.123 A

Explanation:

The time constant for an R and C in series circuit is given by τ = RC.

R = 3000 ohms, C = 0.5 × 10⁻⁶ F = 5.0 × 10⁻⁷ F

τ = 3000 × 5 × 10⁻⁷ = 0.015 s

The voltage across a capacitor as it charges is given be

V(t) = Vs (1 - e⁻ᵏᵗ)

where k = 1/τ

At the point when t = τ, the expassion becomes

V(t = τ) = 1000 (1 - e⁻¹) = 0.632 × 1000 = 632 V

Current flows as a result of potential difference,.

Current in the circuit at this time t =  τ is given by

I = (Vs - Vc)/R

Vs = source voltage = 1000 V

Vc = Voltage across the capacitor = 632 V

R = 3000 ohms

I = (1000 - 632)/3000 = 0.123 A

6 0
4 years ago
Compared to a maritime tropical air mass, a maritime polar air mass has?
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Continental air masses are characterized by dry air near the surface while maritime air masses are moist. Polar air masses are characterized by cold air near the surface while tropical air masses are warm or hot. ... Maritime polar (mP) air masses are cool, moist, and unstable.
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3 years ago
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