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A train with an initial velocity of 20ms-1 is subjected to a uniform deceleration of 2ms-2. The time required to bring the train to a complete halt is
A) 10s
B) 40s
C) 5s
D) 20s
Related Lesson: More Examples on Subway Train Motion | One-Dimensional Kinematics
Comments (4)Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-2.
Related Lesson: Weight and the Gravitational Force | Force and Newton's Laws of Motion
Comments (8)A piece of cork floats in a liquid. What fraction its volume will be immersed in the liquid? [density of the cork = 0.25 × 103kgm-3, Density of the liquid = 1.25 × 103kgm-3]
A) 0.2
B) 0.1
C) 0.8
D) 0.5
Related Lesson: Density and Archimedes’ Principle | Fluid Statics
Comments (2)In the circuit above R is a resistor whose resistance increases with increases with increase in temperature L1 and L2 are identical lamps. If the temperature of R increases
A) L1 becomes brighter and L2 becomes dimmer
B) L1 becomes brighter and L2 does not change
C) L2 becomes dimmer and L1 does not change
D) L1 becomes dimmer and L2 does not change
E) L1 and L2 becomes brighter
Related Lesson: Temperature Variation of Resistance | Electric Current, Resistance, and Ohm's Law
Post CommentA house is supplied with a 240V a.c mains. To operate a door bell rated at 8V, a transformer is used if the number of turns in the primary coil of the transformer is 900. Calculate the number of turns in the secondary coil of the transformer
A) 30
B) 240
C) 248
D) 450
E) 1248
Related Lesson: Transformers | Electromagnetic Induction and AC Circuits
Comments (1)An object is moving with a velocity of 5ms-1. At what height must a similar body be situated to have a potential energy equal in value with the kinetic energy of the moving body? [g ≈ 10ms-2]
A) 1.3m
B) 25.0m
C) 1.0m
D) 20.0m
Related Lesson: Converting Between Potential Energy and Kinetic Energy | Work, Energy and Energy Resources
Comments (1)If a pump is capable of lifting 5000 kg of water through a vertical height of 60 m in 15 min, the power of the pump is
A) 3.3 × 103 Js-1
B) 2.5 × 104 Js-1
C) 2.5 × 105 Js-1
D) 2.3 × 103 Js-1
Related Lesson: Power in Fluid Flow | Fluid Dynamics and Applications
Comments (3)The coefficient of friction between two perfectly smooth surface is
A) Infinity
B) One
C) Half
D) Zero
Related Lesson: Friction | Friction, Drag and Elasticity
Comments (1)A piece of radioactive material contains 1000 atoms. If its half-life is 20 seconds, the time taken for 125 atoms to remain is
A) 40 seconds
B) 20 seconds
C) 60 seconds
D) 80 seconds
Related Lesson: Summarizing Half-Life and Activity | Radioactivity and Nuclear Physics
Comments (1)Calculate the work done, when a force of 20N stretches a spring by 50mm.
A) 0.5 J
B) 2.5 J
C) 1.5 J
D) 2.0 J
Related Lesson: Potential Energy of a Spring | Work, Energy and Energy Resources
Comments (1)