Question and answer
Calculate gravitational force between two 80 kg masses separated by 0.6 m.
Given: m = m = 80 kg r = 0.6 m G = 6.674×10 ¹¹ N·m²/kg² F = G m m / r² F = (6.674×10 ¹¹ × 80 × 80) / 0.6² F = (6.674×10 ¹¹ × 6400) / 0.36 F = 4.271×10 / 0.36 F = 1.19×10 N Answer: 1.19×10 N
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Asked 34 days ago|2/1/2026 10:34:31 AM
Updated 33 days ago|2/2/2026 5:56:38 AM
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Given:
m = m = 80 kg
r = 0.6 m
G = 6.674×10 ¹¹ N·m²/kg²
F = G m m / r²
F = (6.674×10 ¹¹ × 80 × 80) / 0.6²
F = (6.674×10 ¹¹ × 6400) / 0.36
F = 4.271×10 / 0.36
F = 1.19×10 N
Answer: 1.19×10 N
Added 33 days ago|2/2/2026 5:56:09 AM
This answer has been confirmed as correct and helpful.
0
F = G * (m1 * m2) / r^2,

Given m1 = 80 kg, m2 = 80 kg, and r = 0.6 m.
F = (6.674 × 10^-11 N.m2/kg2) * (80 kg * 80 kg) / (0.6 m)^2. F = (6.674 × 10^-11) * (6400) / 0.36 N. F = (4.27136 × 10^-7) / 0.36 N. F = 1.18648 × 10^-6 N.
Added 33 days ago|2/2/2026 5:56:38 AM
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A 5 F and 12 F capacitor are in series across 200 V. Find charge on each
Question
Not Answered
Updated 33 days ago|2/2/2026 6:00:11 AM
1 Answer/Comment
Given:
C = 5 F, C = 12 F, V = 200 V
Series capacitance:
1/C_eq = 1/C + 1/C
1/C_eq = 1/5 + 1/12
1/C_eq = 0.2 + 0.0833 = 0.2833
C_eq 3.53 F
Charge Q = C_eq × V
Q = 3.53 × 200 = 706 C
Voltage across each capacitor:
V = Q / C = 706 / 5 = 141.2 V
V = Q / C = 706 / 12 = 58.8 V
Answer:
Charge on each: 706 C
Voltages: V = 141.2 V, V = 58.8 V
Added 33 days ago|2/2/2026 6:00:11 AM
This answer has been confirmed as correct and helpful.
A stone is dropped from 85 m. Find velocity just before impact.
Question
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Updated 33 days ago|2/2/2026 5:57:27 AM
1 Answer/Comment
Given:
h = 85 m
g = 9.8 m/s²
u = 0 m/s
v² = u² + 2 g h
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v² = 1666
v = sqrt1666
v = 40.82 m/s
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Added 33 days ago|2/2/2026 5:57:27 AM
This answer has been confirmed as correct and helpful.
A mirror forms image 30 cm from mirror for object at 60 cm. Find focal length.
Question
Not Answered
Updated 33 days ago|2/2/2026 5:49:57 AM
2 Answers/Comments
Given:
Object distance u = 60 cm
Image distance v = 30 cm
Mirror formula:
1/f = 1/u + 1/v
1/f = 1/60 + 1/30
1/f = (1 + 2)/60
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Answer: 20 cm
Added 33 days ago|2/2/2026 5:48:07 AM
This answer has been confirmed as correct and helpful.
[Deleted]
Added 33 days ago|2/2/2026 5:49:57 AM
Deleted by Salas1987 [2/2/2026 5:50:04 AM]
A car of mass 1350 kg accelerates from 12 m/s to 28 m/s in 9 s. Determine average force.
Question
Not Answered
Updated 33 days ago|2/2/2026 6:05:20 AM
1 Answer/Comment
Given:
m = 1350 kg
u = 12 m/s
v = 28 m/s
t = 9 s
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a = (28 - 12) / 9
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F = 1350 × 1.778
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Answer: 2400 N
Added 33 days ago|2/2/2026 6:05:20 AM
This answer has been confirmed as correct and helpful.
Find boiling point elevation for 0.9 mol solute in 1.2 kg water, Kb=0.52.
Question
Not Answered
Updated 33 days ago|2/2/2026 5:51:46 AM
1 Answer/Comment
Given:
n = 0.9 mol
m_solvent = 1.2 kg
Kb = 0.52 °C·kg/mol
Tb = Kb × (n / m_solvent)
Tb = 0.52 × (0.9 / 1.2)
Tb = 0.52 × 0.75
Tb = 0.39 °C
Answer: 0.39 °C
Added 33 days ago|2/2/2026 5:51:46 AM
This answer has been confirmed as correct and helpful.
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