A wave has a wavelength of 6 mm and a frequency of 9 hertz. What is its speed? what is the answer and units?

1 answer:

5 0

Answer:The speed is 54 mm/s, the units are mm/s.

Explanation:

1) Data:

a) λ = 6mm
b) f = 9 Hz = 9 s⁻¹
c) v = ?

2) Formula:

wave equation: v = f × λ

3) Solution:

v = 9 s⁻¹ × 6mm

v = 54 mm/s

The speed is 54 mm/s, the units are mm/s.

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A stone is dropped from the edge of a roof, and hits the ground with a velocity of -180 feet per second. How high (in feet) is t

Neko [114]

Answer:

d = 506.25 ft

Explanation:

As we know by kinematics that

$v_f^2 - v_i^2 = 2 a d$

here we know that initially the stone is dropped from rest from the edge of the roof

so here initial speed will be zero

now we have

$v_i = 0$

also the acceleration of the stone is due to gravity which is given as

$g = 32 ft/s^2$

now we have

$v_f = 180 ft/s$

so from above equation

$180^2 - 0 = 2(32)d$

$d = 506.25 ft$

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Certain neutron stars (extremely dense stars) are believed to be rotating at about 1000 rev/s. If such a star has a radius of 14

Sever21 [200]

Answer:

minimum mass of the neutron star = 1.624 × 10^30 kg

Explanation:

For a material to remain on the surface of a rapidly rotating neuron star, the magnitude oĺf the gravitational acceleration on the material must be equal to the magnitude of the centripetal acceleration of the rotating neuron star.

This can be represented by the explanations in the attached document.

minimum mass of the neutron star = 1.624 × 10^30 kg