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3 years ago

The major evidence for the idea that the expansion of the universe is accelerating comes from observations of:

1 answer:

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The redshirting of the spectra of distant galaxies. They are moving away from us at a rate proportional to their distance

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High-speed stroboscopic photographs show that the head of a 180 g golf club is traveling at 47 m/s just before it strikes a 46 g

inn [45]

Answer:

47 m/s

Explanation:

golf club mass, mc = 180 g

golf ball mass, mb = 46 g

initial golf club speed, vc1 = 47 m/s

final golf club speed, vc2 = 35 m/s

initial golf ball speed, vb1 = 0 m/s

final golf ball speed, vb2 = ? m/s

The total momentum is conserved, then:

mc*vc1 + mb*vb1 = mc*vc2 + mb*vb2

Replacing with data and solving (dimension are omitted):

180*47 + 46*0 = 180*35 + 46*vb2

vb2 = (180*47 - 180*35)/46

vb2 = 47 m/s

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3 years ago

Read 2 more answers

Why might be people be causing global warming?

amid [387]

Pollution?
:):):):):):)

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3 years ago

4. What is the acceleration of a car traveling at 65 mph that keeps a constant speed over

Rzqust [24]

Answer:

Explanation:

Remeber speed and velocity are the same concept, it just speed is scalar, meaning it doesn't have a direction nor it negative.

So technically thr car had a constant speed over 75 seconds.

If thr car has a constant speed, the car isn't speeding up or slowing down so it has accleration of 0 so the answer is a.

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2 years ago

Describe an instance when the motion energy of an object changed, causing some other energy change as well.

bonufazy [111]

Answer:

For instance, an immobile object located at some height above the ground has potential energy. If the object starts to fall, its potential energy is converted to motion or kinetic energy. The heavier and the higher the object is, the more potential energy it will have. Transfer of thermal energy via conduction is aided by vigorously vibrating particles in a medium that has gained energy through heating.

Explanation:

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3 years ago

Thin Layer Chromatography consists of three parts: The analyte, the stationary phase, and mobile phase. Match each of these term

Margaret [11]

Answer:

Analyte⇒ one of analgesics

stationery phase⇒ silica

mobile phase⇒ solvent

Explanation:

during the thin layer chromatography non volatile mixtures are separated.The technique is performed on the plastic or aluminum foil that is coated with a thin layer.

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2 years ago