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Anvisha [2.4K]
3 years ago
9

A worker drives a spike into a rail tie with a 2.00-kg sledgehammer. This caused the internal energy of the hammer and spike to

increase by 1,250 Joules. If one half of the hammer’s kinetic energy is converted into the internal energy of the hammer and spike, what was the hammer’s speed when it hit the spike? In your computations, for the mass, use the mass of the hammer only.
Physics
1 answer:
antoniya [11.8K]3 years ago
8 0

Answer:

50 m/s

Explanation:

half of the hammer’s kinetic energy = internal energy of the hammer and spike

½ (½ mv²) = U

v² = 4U/m

v² = 4 (1250 J) / (2.00 kg)

v = 50 m/s

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if pete (mass =90.00kg) weighs himself and finds that he weighs 30.0 pounds, how far away from the earth is he?
Svet_ta [14]

Here we know that mass of the person is 90 kg

His weight is given as 30 lbf

so here we can convert it into Newton as we know that

1 lbf = 4.45 N

Now from above conversion

30 lbf = 30 \times 4.45 = 133.45 N

now we can use this to find the gravity at this height

mg = 133.45

90\times g = 133.45

g = 1.49 m/s^2

now we know that with height gravity varies as

g' = g(\frac{R}{R+H})^2

1.49 = 9.8(\frac{6.37\times 10^6}{6.37\times 10^6 + h})^2

h = 1.0 \times 10^7 m

so above is the height from the surface of earth

4 0
2 years ago
When observed from earth, the wavelengths of light emitted by a star are shifted toward the red end of the electromagnetic spect
Musya8 [376]

Answer:

When observed from Earth, the wavelengths of light emitted by a star are shifted toward the red end of the electromagnetic spectrum because: the star is moving away from planet Earth.

A star is a giant astronomical or celestial object that contains a luminous sphere of plasma and bounded together by its own gravitational force.

A redshift can be defined as a displacement (shift) of the spectral lines of celestial or astronomical objects toward longer wavelengths (the red end of an electromagnetic spectrum), as a result of the Doppler effect.

Hence, a redshift is considered to be a subtle change in the color of visible electromagnetic radiation from stars (starlight), as observed from planet Earth.

In conclusion, a redshift occur when observing a star from planet Earth because the star is moving away from planet Earth.

Read more: brainly.com/question/17934476

Explanation:

have a great day :)

3 0
1 year ago
What force does the laser beam exert on a completely absorbing target?
saw5 [17]
You would have to use the partition force to laaser beam expert on a completely absorbing target
4 0
3 years ago
3. A 40.0-kg wagon is towed up a hill inclined at 18.5 with respect to the horizontal. The tow rope is parallel to the incline a
inn [45]
Force=tension-fg sin ∅
=140-mg sin 18.5
=140-124.35
=15.62N

a=f/m=15.62/40=0.39
now,
v²=u²+2as
=2×0.39×80
v²=62.4
v=7.8m/s
4 0
2 years ago
What<br> are the properties of magnets?
babymother [125]

Answer:

Attractive Property – Magnet

Explanation:

attracts ferromagnetic materials like iron, cobalt, and nickel. Repulsive Properties – Like magnetic poles repel each other and unlike magnetic poles attract each other. Directive Property – A freely suspended magnet always points in a north-south direction.

8 0
3 years ago
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