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Deffense [45]
3 years ago
9

A wave has a wave length of 20mm and a frequency of 5 hertz. What is the speed?

Physics
2 answers:
zmey [24]3 years ago
7 0

Speed = (wavelength) x (frequency

Speed = (.020 m) x (5 / sec)

Speed = 0.1 m/s
Verizon [17]3 years ago
5 0
100 mm/s one hundred millimeters per second
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Answer:

See Explanation

Explanation:

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6 0
3 years ago
A driver is moving at 17.0 m/s when she sees a child on a bike 65m ahead of her. If the car can brake at 4.9 m/s^2 and the drive
Lera25 [3.4K]

Answer:

The driver can  avoid the child because at the time she brake 1.6s the car just move 20.928 meters so is far to the 65 meters where the kind is

Distance= 20.928 m

Explanation:

V_{o} = 17 \frac{m}{s} \\a= -4.9 \frac{m}{s^{2} }\\ t= 1.6 s

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So to calculated the distance while she is braking

X_{f} = X_{o} +V_{o}*t + \frac{1}{2} * a *t^{2}\\ X_{f} = 0m +17 \frac{m}{s} *1.6 s + \frac{1}{2} * 4.9 \frac{m}{s^{2} } *(1.6s)^{2}\\X_{f} = 27.2 m+ (-6.272 m)\\X_{f} = 20.928 m

The distance of the car is less than the distance of the kid in his bike

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7 0
3 years ago
Stand on a bathroom scale on a level floor, and the reading on the scale shows the gravitational force on you, mg. If the floor
kari74 [83]

Answer:

<em>The angle introduces an error on the mesure of the weight</em>

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<u><em>Weight and Normal Forces</em></u>

When an object is resting on a horizontal surface, its weight is directed downwards and the normal force has the same magnitude and opposite direction, i.e. directed upwards. When some angle α exists between the surface and the horizontal plane, the scale keeps 'feeling' the Normal force, but it's not equal to the weight anymore, but to the perpendicular component of the weight to the surface where the scale is placed. It can be found that the component of the weight is m.g.cosα

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m.g.cos 10^o=0.985(mg)

That is, 98.5% of the correct weight. So it's important to measure weight on horizontal surfaces

7 0
3 years ago
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Katena32 [7]

Answer:

i think D

hope this helps

let me know if i'm wrong i will change the answer

Explanation:

5 0
3 years ago
Read 2 more answers
H-2 + H-3 → He-4 +
Svetach [21]
D)
<span>No. the products include He-4, one neutron, and energy.</span>
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