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Andreas93 [3]
3 years ago
15

Cindy exerts a force of 40 N and moves a chair 6 m. Her brother and he pushes a different chair for 6 m while exerting a force o

f 30 N. Andy does: more, less work than Cindy. The difference of their amounts of work is: 20, 40, 60, or 180 Nm.
Physics
1 answer:
Lostsunrise [7]3 years ago
6 0
Wa = F*d = 240J
Wb = 180 J

Andy does less work
Difference is 60J
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A coil is connected in series with a 19.0 kΩ resistor. An ideal 50.0 V battery is applied across the two devices, and the curren
Gre4nikov [31]

Answer:

inductance of the coil 29.3767  H

Explanation:

given data

resistor R =  19.0 kΩ = 19 × 10³ Ω

potential applied V  = 50.0 V

current I = 2.20 mA  =  2.20 × 10^{-3} A

time t = 2.80 ms = 2.80 × 10^{-3} s

solution

we know for maximum current in circuit that is

current = V ÷ R   .........1

current =  \frac{50}{19\times 10^3}

current = 2.63 × 10^{-3} A

so at time t = 0

t = -\frac{L}{R} ln(1-\frac{I_f}{I_{max}})  

2.80 \times 10^{-3} = -\frac{L}{19\times 10^3} ln(1-\frac{2.20\times 10^{-3}}{2.63\times 10^{-3}}})  

L = 29.3767

3 0
3 years ago
If the cd rotates clockwise at 500 rpm (revolutions per minute) while the last song is playing, and then spins down to zero angu
Katen [24]

The solution for this problem is:

500 revolution per minute = 8.33rev /s = 2π*8.33 rad /s = 52.36 rad /s 

Angular velocity ω = 2π N

Angular acceleration α= (ω2 - ω1) /t

ω2 = 0

α = - ω1/t = -2π N /t

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3 0
3 years ago
Calcular la energía cinética de un Coyote de 30 kg que corre tras su presa con una velocidad de 65 km/h
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Respuesta:

4.9 × 10³ J

Explicación:

Paso 1: Información provista

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Paso 2: Convertir la velocidad del coyote de km/h a m/s

Vamos a usar los siguientes factores de conversion:

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65 km/h × (1000 m/1 km) × (1 h/3600 s) = 18 m/s

Paso 3: Calcular la energía cinética del coyote (K)

Usarémos la siguiente fórmula.

K = 1/2 × m × v²

K = 1/2 × 30 kg × (18 m/s)² = 4.9 × 10³ J

6 0
3 years ago
In a position time graph, a curved line represents: acceleration no movement constant velocity
xz_007 [3.2K]

A curved line on a position/time graph shows that the speed is changing.

So right there, we know there is acceleration.

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Answer: Yes, the time stops when traveling at the speed of light.

Explanation:

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