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Anna71 [15]
3 years ago
6

The change in frequency of a wave as its source moves in relation to an observer.

Physics
1 answer:
denis-greek [22]3 years ago
8 0

Answer: B) Frequency

Explanation:

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The type of force measured by grocery store spring scale is
alexandr402 [8]

Answer:

Weight

Explanation:

The spring balance is used to measure weight of an object.

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2 years ago
What do you think is the most important invention or innovation from the past 100 years? Please explain your answer, and tell me
mr_godi [17]
It the ecosystem and the cuclí
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2 years ago
How can heat be transferred?
Lyrx [107]
D because gamma rays and ultra violet rays are one of the examples of the three ways to transfer heart which is convection, radiation, and conduction.
5 0
3 years ago
If a rock weighing 2,200 N is dropped from a height of 15 m, what is its kenetic energy just before it hits the ground
ycow [4]

Kinetic energy of the rock just before it hits the ground=KE=33000 J

Explanation:

Weight= 2200N

mg=2200

m(9.8)=2200

m=224.5 kg

initial velocity=0

final velocity =V

using kinematic equation V²=Vi²+2gh

V²=0+2 (9.8)(15)

V=17.1 m/s

now kinetic energy= 1/2 mV²

KE= 1/2 (224.5)(17.1)²

KE=33000 J

Thus the kinetic energy of the rock just before it hits the ground=33000 J

7 0
3 years ago
What is the index of refraction in quartz if light travels at 2.0567 x 108m/s when in quartz?
Gnesinka [82]

Index of refraction of a substance =

(speed of light in vacuum) / (speed of light in the substance)

Index in quartz = (2.9979 x 10⁸ m/s) / (2.0567 x 10⁸ m/s)

<em>Index =  1.4576 </em> (no units)

7 0
3 years ago
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