In which of the following is work being done?
Correct answer: C. Sarah walking up the staircase
- A. Jack carrying a bucket of water along a horizontal road
- B. A skydiver falling with uniform velocity towards the ground
- C. Sarah walking up the staircase
- D. Asad swinging a marble tied to a string at uniform speed
Explanation
Work is defined as the force applied on an object causing displacement in the direction of the force. In option C, Sarah walking up the staircase involves applying a force against gravity, resulting in vertical displacement, hence work is done. In option A, Jack's vertical force does not cause horizontal displacement, so no work is done. Option B describes a skydiver with balanced forces, meaning no net force and thus no work done. In option D, the force is centripetal and perpendicular to the motion, so no work is done.
Last updated
Related questions
48 competitors entered the men's 100 metres freestyle event at this year's Muscan Swimming Championships. They were divided randomly into 6 heats, with the fastest 16 qualifying for the semi-finals.These are the results of the 6 heats.From which heat was there only one qualifier for the semi-finals?
A ballet dancer of mass 80 kg and a wingspan of 1m is executing a spin. She then folds her arms and brings them to within 20cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?
A ballet dancer of mass 80 kg and a wingspan of 80cm is executing a spin. She then folds her arms and brings them to within 20 cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?
A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?
A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?