Three forces in equilibrium: if two are equal and at 120°, third force is: MCQ with Answer and Explanation

Three forces in equilibrium: if two are equal and at 120°, third force is:
A. Sum of two
B. Equal to each, at 120° to both
C. Zero
D. Difference of two
Answer: Option B
Solution (By JKExamLibrary)
Vector equilibrium: three equal forces at 120° form closed triangle. Third force equals magnitude of others, oriented 120° from each. Memory aid: 'Equilibrium: vector sum = 0; symmetric forces ⇒ symmetric angles'. Statics concept frequently tested in competitive exams.

This question belongs to: Science Physics

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1 Report Error
1 nanometer equals
A. 10⁻⁶ m
B. 10⁻¹⁰ m
C. 10⁻⁹ m
D. 10⁻¹² m

Correct Answer: Option C


Explanation:
nano = 10⁻⁹. So 1 nm = 10⁻⁹ m. Angstrom = 10⁻¹⁰ m. picometer = 10⁻¹² m.

This question belongs to: Science Physics
Question #2 Report Error
The time period of a geostationary satellite is:
A. 12 hours
B. 24 hours
C. 27.3 days
D. 365 days

Correct Answer: Option B


Explanation:
A geostationary satellite orbits the Earth directly over the equator at an altitude of ~35,786 km. It revolves in the same direction the Earth rotates. Its orbital period perfectly matches Earth's rotational period, which is 24 hours. Because of this, it appears entirely stationary from any point on Earth's surface, making it ideal for communications and DTH TV.

This question belongs to: Science Physics
Question #3 Report Error
A car of mass 1000 kg moves with velocity 20 m/s. Kinetic energy is
A. 200 kJ
B. 400 kJ
C. 10 kJ
D. 20 kJ

Correct Answer: Option A


Explanation:
KE = ½×1000×400 = 200,000 J = 200 kJ.

This question belongs to: Science Physics