Physicsmedium · Past Paper
Work done is said to be zero if the angle between force and displacement is:
A0 degrees
B45 degrees
C90 degrees
D180 degrees
✓ Correct Answer: C — 90 degrees
Work is W = Fd cos(theta). When theta is 90 degrees, cos(90) is 0, making the total work done zero.
Share this question
More from Physics
- Water is falling from a waterfall at the rate of 100 kg/s on the blades of a turbine. If the height of the fall is 100 m, the power delivered to the turbine is (g=10):
- The vector quantity among the following is:
- A galvanometer with a resistance of 100 Ohms gives full scale deflection for a current of 1mA. How much series resistance is needed to convert it into a voltmeter of range 0-10V?
- Two plane mirrors are inclined at 60 degrees. How many images of an object placed between them will be formed?
- Why is the core of a transformer laminated?