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Goshia [24]
2 years ago
6

What is the force of the drag for a 65 kg bicyclist, initially at rest at the top of a hill coasts down the hill, reaching a spe

ed of 15.5 m/s at the bottom of the hill. The distance is 60M. neglect any friction impeding the motion and the rotational energy of the wheels.
Height is 19M
Intial GPE is 12350J

KE is 7808J and loss is 4542 J
Physics
1 answer:
Fofino [41]2 years ago
4 0
Who knows, not me, not me and not me again
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A new record for running the stairs of the Empire State Building were set on February 4, 2003. The 86 flights, with a total of 1
Roman55 [17]

Answer:

Power = 377.35 W or Power = 0.5065 hp

Explanation:

Given:

Number of steps, n = 1576

height of each step, h = 0.20 m

Total height achieved, H = nh = 1576 × 0.20 = 315.2 m

Mass of the runner, M = 70.0 kg

Total time taken, t = 9 minutes 33 seconds = (9 × 60) + 33 = 573 seconds

Now, the potential energy gained by the runner,

E = MgH

where, g is the acceleration due to the gravity

on substituting the values in the above formula, we get

E = 70 × 9.8 × 315.2

or

E = 216227.2 J

also,

Energy = Power × time

therefore,

Power = Energy/time

or

Power = 216227.2 J / 573

or

Power = 377.35 W

Now,

745 watt = 1 hp

or

1 watt = 1/745 hp

thus,

Power = 377.35 W = 337.35 × (1/745) hp

or

Power = 0.5065 hp

4 0
3 years ago
What is the maximum wavelength of incident light that can produce photoelectrons from silver? The work function for silver is Φ=
zalisa [80]

Answer:

4.24nm

0.385eV

Explanation:

Maximum wavelength (λmax) :

λmax = ( hc) /Φ

h = plancks constant = 6.63 * 10^-34

c = speed of light = 3*10^8

1ev = 1.6 * 10^-19

Φ = 2.93eV = 2.93* (1.6*10^-19) = 4.688*10^-19

λmax = [(6.63 * 10^-34) * (3 * 10^8)] / 4.688*10^-19

λmax = 19.89 * 10^-26 / 4.688*10^-19

λmax = 4.242 * 10^-7 m

λmax= 4.24nm

B.)

E = hc / eλ eV

λ = 3.75nm = 3.75 * 10^-7m = 375 *10^-9

E = (6.63 * 10^-34) * (3 * 10^8) / (1.6 * 10^-19) * (375 * 10^-9)

E = 19.89 * 10^-26 / 600 * 10^-28

E = 0.03315 * 10^-26 + 28

E = 0.03315 * 10^2

E = 3.315 eV

Stopping potential : (3.315 eV - 2.93eV) = 0.385eV

7 0
3 years ago
Please help me I will give you 20 points !!
nadezda [96]

Answer:

D. The primary source, because it was written by the researcher

Explanation:

One should learn to trust the primary source more because it is the real work of the researcher.

A primary work defines the work of research from his or her experimental findings.

  • The primary source presents experimental data and other subordinates ones to reach a conclusion as seen from the view of the researcher.
  • A secondary source implies someone else documenting their own opinion about the primary experimental set up.
  • This can get dicey in the sense that results can be twisted to serve other ulterior motives.

8 0
3 years ago
In outer space, a piece of rock continues moving at the same velocity for
Ray Of Light [21]

The absence of external force in the outer space, allows the piece of rock to continue moving at the same velocity for thousands of years.

<h3>Absence of external force on the outer space</h3>

The outer space is almost an absolute vacuum, because it's nearly empty. There is no matter such as air in the outer space that will provide an external force needed to change the velocity of the piece of rock.

From Newton's first law of motion, an object in a state of rest or uniform motion in a straight line, will continue in that state unless it is acted upon by an external force.

Thus, the absence of external force in the outer space, allows the piece of rock to continue moving at the same velocity for thousands of years.

Learn more about outer space here: brainly.com/question/24701339

7 0
2 years ago
A car, starting from the origin, travels 4 km east and then 7 km west. What is the traveled distance of the car from the initial
katrin2010 [14]

The traveled distance of the car from the initial point is (4+7) Km, i.e., 11 Km.

3 0
3 years ago
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