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PolarNik [594]
3 years ago
11

The lowest point in Death Valley is 75.5 m below the sea level. The summit of nearby Mt. Whitney has an elevation of 4360 m. Wha

t is the change in potential energy of an energetic 63 kg hiker who makes it from the floor of Death Valley to the top of Mt. Whitney?
Physics
1 answer:
sineoko [7]3 years ago
8 0

Answer:2738.477 kJ

Explanation:

Given

Lowest Point of death valley is 75.5 m below sea level

Height of Mt. Whitney is 4360 m

mass of hiker =63 kg

Change in potential energy=m\times g\times (h_2-h_1)

Considering sea level a datum

\delta PE=63\times 9.8\times (4360-(-75.5))=2738477.7 J

\delta PE=2738.477 kJ

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Tests reveal that a normal driver takes about 0.75 s before he or she can react to a situation to avoid a collision. It takes ab
nata0808 [166]

To solve this problem we will apply the linear motion kinematic equations. On these equations we will define the speed as the distance traveled in a space of time, and that speed will be in charge of indicating the reaction rate of the individual. In turn, using the ratio of speed, position and acceleration, we will clear the position and determine the distance necessary for braking.

The relation to express the velocity in terms of position for constant acceleration is as follows

v^2 = u^2+2a(s-s_0)

Here,

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PART 2)

PART 1) Calculate the displacement within the reaction time

d = vt

d = (44)(3)

d = 132ft

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7 0
4 years ago
A delta connection has a voltage of 560 V connected to it. How much voltage is dropped across each phase
SashulF [63]

Answer:

E_Phase = 560V

Explanation:

The computation of the voltage i.e. dropped across each phase is shown below:

Given that

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And, in the case of delta connection, the line voltage would be equivalent to the phase voltage

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In the lab, You have a highly reactive metal like sodium. It is so reactive that water sets it off. How would you store it?
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Answer:

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Group 1 metals are known to be very highly reactive. The chemical reactivity of the members of the group decreases down the group.

Sodium reacts violently with water and upon exposure to the atmosphere. As a result of this, it must be stored under paraffin oil.

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