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tester [92]
3 years ago
12

What is the change in potential energy of an energetic 72 kg hiker who makes it from the floor of death valley to the top of mt.

whitney?
Physics
1 answer:
storchak [24]3 years ago
3 0
<span>The lowest point in Death Valley is 85 m below sea level. The summit of nearby Mt. Whitney has an elevation of 4420 m. </span>
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If Karen rode her bicycle 5 km to school in 30 minutes, what was her average speed? Give your answers in km/h.
Doss [256]

Answer:

10 km/h

Explanation:

Before calculating the average speed, we need to convert the time taken for the trip from minutes to hours. Since 1 hour cointains 60 minutes, we have:

1 h: 60 min = t : 30 min\\t=\frac{1 h \cdot 30 min}{60 min}=0.5 h

Karen's average speed is given by:

v=\frac{d}{t}

where

d = 5 km is the distance covered

t = 0.5 h is the time taken for the trip

Substituting into the equation, we find

v=\frac{5 km}{0.5 h}=10 km/h

5 0
3 years ago
How much kinetic energy a 498 kg motorcycle has when it is moving at 5.7 m/s
mel-nik [20]

Answer:

8090.01 J

Explanation:

The formula for kinetic energy is KE = \frac{1}{2}mv^{2}.  We are given the mass and velocity, so plug what is given into the equation.  KE = \frac{1}{2}(498)(5.7^{2}) = 8090.01 \ J

8 0
2 years ago
A. Give an example of the conversion of light energy to electrical energy.
storchak [24]

Explanation:

a) photovoltaic cell is a semiconductor device and it converts light energy to electrical energy

b) burning of coal converts chemical energy to heat energy

c) rubbing of both hands against each other converts mechanical to heat energy

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