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grandymaker [24]
3 years ago
5

Superman can leap over tall buildings in a single bound. What does he do to the ground beneath him? Assume his mass is 100.0 ± 0

.1 kg and his hips drop by 0.300 ± 0.020 m before he jumps. If he can jump over the top of PNC Plaza (tallest building in Raleigh), which is 164 ± 1 m, calculate the following with uncertainties:
a. Takeoff velocity
b. Acceleration just before takeoff
c. Force on ground at take off
Physics
1 answer:
statuscvo [17]3 years ago
7 0

Answer:

Explanation:

Height reached = 164m

If velocity of launch be u

u² = 2gh

= 2 x 9.8 x 164

= 3214.4

u = 56.7 m /s

difference in u = 1/2  (diff in h / h) x u

1/2 x 1/164 x 56.7

.17 or .2

u = 56.7 ± .2 m /s

or 57± 1

b )  During the displacement of .300 m , there is acceleration to achieve velocity of 56.7 m /s

v² = 2as

a = v² / 2s

= 56.7² / (2 x .3)

= 5358.15 m /s²

diff in a

= 1/2 x (.02 / .3) x 5358.15

178.6

a = 5358.1 ±178.6

c ) force on the ground

mass ( g + a )

= 100 x ( 9.8 +5358.1)

= 536790 N

error  in force = (.1/100 + 178.6 / 5358 ) x 536790

=( .01 +.03)x 536790

= 21471

(536790 ± 21471) N

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rusak2 [61]

Answer:

6s

Explanation:

Assume it is dropped from rest and the gravitational acceleration is 10

By the equation of motion under constant acceleration:

s=ut+\frac{1}{2} at^2

180 = (0)t+10(t^2)/2

t = 6 or -6 (rejected)

t = 6 s

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3 years ago
An astronaut working with many tools some distance away from a spacecraft is stranded when the "maneuvering unit" malfunctions.
N76 [4]

Answer:

He can return to the spacecraft by sacrificing some of the tools employing the principle of conservation of momentum.

Explanation:

By carefully evaluating his direction back to the ship, the astronaut can throw some of his tools in the opposite direction to that. On throwing those tools of a certain mass, they travel at a certain velocity giving him velocity in the form of recoil in the opposite direction of the velocity of the tools. This is same as a gun and bullet recoil momentum conservation. It is also the principle on which the operational principles of their maneuvering unit is designed.

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3 years ago
Considera que en tu casa tienes un televisor de 110 W, si pasa encendido 4 horas diarias, Cuál será la energía consumida durante
rjkz [21]

Answer:

 E = 13.2 kWh

,     Cost = $ 10.8

Explanation:

We can look for the consumed energy from the expression of the power

      P = W / t

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       P = E / t

       E = P t

       

look for the energy consumed in one day and multiply by the days of the month in the month

      E = 110 4 30

      E = 13200 W h

       E = 13.2 kWh

the cost of this energy is

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4 0
3 years ago
Read 2 more answers
Two +1 C charges are separated by 30000 m, what is the magnitude of<br> the force?
Kipish [7]

Answer:

<em>The magnitude of the force is 10 N</em>

Explanation:

<u>Coulomb's Law</u>

The electrostatic force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between the two objects.

Written as a formula:

\displaystyle F=k\frac{q_1q_2}{d^2}

Where:

k=9\cdot 10^9\ N.m^2/c^2

q1, q2 = the objects' charge

d= The distance between the objects

We have two identical charges of q1=q2=1 c separated by d=30000 m, thus the magnitude of the force is:

\displaystyle F=9\cdot 10^9\frac{1*1}{30000^2}

\displaystyle F=9\cdot 10^9\frac{1*1}{30000^2}

F = 10 N

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7 0
3 years ago
it took 3.5 hours for a train to travel a distance between two cities at a velocity of 120 miles per hour how many miles Live be
AveGali [126]

hope this helps........

3 0
3 years ago
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