35x5=175sec
Explanation:
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Answer:
B) Polonium and Arsenic
Explanation:
Metalloids are a small category of elements that are right between metals and non-metals, and have properties from those categories.
The most recognized are: Boron, Silicon, Germanium, Arsenic, Antimony, and Tellurium.
Some that are irregularly recognized are Polonium and Astatine.
The only option with the elements in either of the shown elements is B) Polonium and Arsenic.
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D. The sand has a higher conductivity.
Answer:
0.725 kg
Explanation:
Step 1: Given data
- Kinetic energy of the softball (K): 145 J
- Speed of the softball (v): 20.0 m/s
- Mass of the softball (m): ?
Step 2: Calculate the mass of the softball
We will use the following expression.
K = 1/2 × m × v²
m = 2 K / v²
m = 2 × 145 J / (20.0 m/s)²
m = 0.725 kg
The mass of the softball is 0.725 kg.
