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3 years ago

11

A 3.5 Newton force (directed at a 30 degree angle with the vertical) to

1 answer:

kakasveta [241]3 years ago

3 0

Answer:

8.75J

Explanation:

use formula of work done

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A train is traveling away from you at 120 km/h. it blows its whistle, and you hear a tone of 0.400 kHz. Take the speed of sound

Vaselesa [24]

Answer:B)439.21 Hz

Explanation:

Given

velocity of train $v=120 km/h\approx 120\times \frac{5}{18}=33.33 m/s$

frequency of train $f_a=0.400 kHz\approx 400 Hz$

speed of sound $c=340 m/s$

frequency from Doppler effect can be calculated by

$f_a=(\frac{c}{c+v})\cdot f$

$400=(\frac{340}{340+33.33})\cdot f$

$400=\frac{340}{373.33}\cdot f$

$f=400\times 1.098$

$f=439.21 Hz$

5 0

3 years ago

Simplify completely: -3(4-9)+6-2(-8+5)

Elis [28]

Answer:

29

Explanation:

-3(4-9)+6-2(-8+5)

-12+27+6+18-10

29

5 0

3 years ago

Read 2 more answers

Two balls have the same mass of 5.00 kg. Suppose that these two balls are attached to a rigid massless rod of length 2L, where L

olga_2 [115]

Answer:

Explanation:

Given

mass of balls $m= 5 kg$

$N=45.6 rev/s$

angular velocity $\omega =2\pi N=286.55 rad/s$

Length of Rod $2L=1.1 m$

Tension in the Second half of rod

$T_2=m\omega ^2(2L)=2m\omega ^2L$

$T_2=5\times (286.55)^2\times 1.1$

$T_2=451.609 kN$

For First Part

$T_1-T_2=m\omega ^2L$

$T_1=T_2+m\omega ^2L$

$T_1=3 m\omega ^2L$

$T_1=3\times 5\times (286.55)^2\times 0.55$

$T_1=677.41 kN$

7 0

3 years ago

What is the relationship between force, mass, and acceleration? (how do they effect one another)

Firdavs [7]

Answer:

F=ma

Explanation:

5 0

4 years ago

Do magnetic fields exist?

Art [367]

I believe yes they do hope this helps

6 0

3 years ago

Read 2 more answers