FreeNotes
Statements: 1. Convert the following: a. 160 km/h into m/s (Answer: 44.44 m/s) b. 36 m/s into km/h (Answer: 129.6 km/h) c. 15 km/h into m/s (Answer: 4.17 m/s) d. 1 m/s into km/h (Answer: 3.6 km/h) 2. In 10 seconds, a cyclist increases its speed from 5 km/h to 7 km/h, while a car … Read more
Statements: 1. A boy is holding a book of mass 2 kg. How much force is he applying on the book? If he moves it up with acceleration of 3 m/s², how much total force should he apply on the book? (Ans: 19.6 N, 25.6 N) 2. A girl of mass 30 kg is running … Read more
Solve the following questions. 1. Calculate the torque acting on a spanner of length 20 cm used to loosen a nut with a force of 50 N. If the same nut is to be loosened by a force of 100 N, what should be the length of the spanner? (Ans. 10 Nm and 10 cm) … Read more
Solve the following: 1. Calculate the work done in pushing a box with 150 N through a distance of 5 m. (Ans. 750 J) 2. A boy weighing 75 N jumps up and gains 300 J of gravitational potential energy. Find the height to which the boy will rise. (Ans. 4 m) 3. A 5 … Read more