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guajiro [1.7K]
3 years ago
6

A student wants to approximate the amount of work that the force due to gravity does on the student as the student walks up a se

t of stairs. Which of the following measurements must the student collect in order to approximate the amount of work done by Earth on the student?
a. The mass of the student.
b. The angle between the inclined portion of the stairs and the horizontal.
c. The total inclined length of the stairs.
d. The final vertical height above the initial vertical position.
Physics
1 answer:
Inessa [10]3 years ago
3 0

Answer:

Options A and D

Explanation:

In this question the student needs to collect these measurements in order to approximate the work done

A. The mass of the student

D. The final vertical height above the initial vertical position.

Workdone = mgh

m = mass

g = gravity = 9.8m/s²

h = vertical height between the initial and the final positions.

The vertical height has to be known as gravity only acts straight down.

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A 15 kg box sits still on a rough inclined plane (no math required here).
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Answer:

Explanation:

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Compare the strengths of UV light and microwaves (in Hz). Which type of light is more powerful and how do you know?
TEA [102]

Answer:

UV light is more powerful as it has greater energy.

Explanation:

The energy propagated by electromagnetic waves ( light ) through vacuum or medium is known as electromagnetic radiation.

The frequency/wavelength range of electromagnetic radiation is known as electromagnetic spectrum. The electromagnetic spectrum ranging from gamma ray to radio waves.

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Frequency range of Microwaves = ( 300 x 10⁶ to 300 x 10⁹ ) Hz

Ratio of UV light to Microwaves = (\frac{8\times10^{14} }{300\times10^{6} } to \frac{3\times10^{16} }{300\times10^{9} } )

                                                     = ( 2.66 x 10⁶ to 1 x 10⁸ )

Energy of electromagnetic radiation is given by the relation:

E = hν

Here h is plank's constant and ν is frequency.

UV light is more powerful than Microwaves as frequency of UV light is greater than frequency of microwaves. Thus, by the above equation, the energy of UV light is more than energy of Microwaves.  

5 0
3 years ago
Which of the following is not a subatomic particle?
Fynjy0 [20]
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7 0
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An airplane with an airspeed of 120 km/h has a heading of 30 degree east of North in a wind that is blowing toward the east at 6
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Answer:

Explanation:

Velocity of plane relative to ground V_pg = ?

Given the velocity in vector form ,

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= 120 cos30 i + 120sin30j + 60i

= 164 i + 60 j

magnitude

=251 km / h

=

8 0
3 years ago
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