Physics
10.12.2022 13:00
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Which of the following elements is a metalloid? a. copper b. helium C. phosphorus
Which of the following elements is a metalloid?
a. copper
b. helium
C. phosphorus
d. germanium
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a. copper
b. helium
C. phosphorus
d. germanium
sabrinachambers444
4,7(12 marks)
Germanium
Explanation:
Germanium is a chemical element that is grayish white metalliod
ninaaforever
4,6(70 marks)
423.36 J
Explanation:
Change in gravitational potential energy= mgh where m is the mass of the displaced object g is the acceleration due to gravity and h is the displacement along a plane parallel to gravity vector.
From the question.m= 72kg, h=60cm=0.6m
g=9.8m/s²
Δ PE= 72kg×9.8m/s²×0.6m
=423.36 J
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