Doubtly
@Doubtly · Joined Feb 2021
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- Pravin has applied a force of 100 N on an object, at an angle of 600 to the horizontal. The object gets displaced Given here is θ=60⁰ and F=100N, while W= 400J , SO s=? Take the equation W = F s Cos θ Replace with values 400= 100 × s × ½ Hence, 400 / 100... 1
- Calculate the work done to take an object of mass 20 kg to a height of 10 m. (g = 9 8 m/s2) Suppose mass of the object (m) = 20 kg, while height (s) = 10 m given that g = 9.8 m/s² The value for F = mg = 20 × (-9 8) (Because the disp... 2
- Write about the National Physical Laboratory. The National Physical Laboratory, conceptualized in 1943 was situated in New Delhi and functions under the Council of Scientific and Industr... 1
- Give an example of where the work done by the gravitational force is zero. Take the example of an artificial satellite moving around the earth in a circular orbit. The work done by the gravitational force is zero as... 1
- With the force and the displacement specified, define the work done by the force. Work done by the force in the various scenarios are explained here: 1. The work done by the force is positive when the force and the displac... 2
- Define the relationship between joule and erg using the equation. It is given that 1 newton (1N) = 10⁵ dyne, while 1m = 10² cm. So, if Work= forces × displacement, then 1 joule = 1 newton × 1 m 1 joule = 10... 1
- Explain unit of work as per SI and CGS system. Given that, Work = Force × Displacement, the unit of force in SI system is newton (N), while the unit of displacement is metre (m). Hence, t... 1
- The work done on an object does not depend on .... (i) displacement (ii) applied force The work done on an object does not depend on initial velocity of the object. 1
- If we increase the velocity of a car moving on a flat surface to four times its original speed, its potential energy If we increase the velocity of a car moving on a flat surface to four times its original speed, its potential energy will not change. 1
- The total energy of an object falling freely towards the ground ... (i) decreases (ii) remains unchanged The total energy of an object falling freely towards the ground remains unchanged. 1
- The potential energy of your body is least when you are ..... (i) sitting on a chair (ii) sitting on the ground The potential energy of your body is least when you are sleeping on the ground. 1
- While dragging or lifting an object, negative work is done by (i) the applied force (ii) gravitational force While dragging or lifting an object, the negative work is done by frictional and gravitational force, respectively. 1
- Power is a measure of the ....... (i) the rapidity with which work is done (ii) amount of energy required to perform Power is a measure of the rapidity with which work is done 2
- Which of the forces involved in dragging a heavy object on a smooth, horizontal surface, have the same magnitude? The gravitational force and the reaction force in vertical direction have same magnitude. Friction is not action as the horizontal surface i... 1
- Joule is the unit of ... (i) force (ii) work (iii) power (iv) energy Joule is the unit of work and energy 2
- For work to be performed, energy must be .... (i) transferred from one place to another (ii) concentrated correct option is a For work to be performed, energy must be transferred from one place to another. 1
- A slit of width 'a' is illuminated by white light. For what value of 'a' will the first minima for red light fall A slit of width 'a' is illuminated by white light. For what value of 'a' will the first minima for red light fall at an angle of 300 2
- Derive the formula for the kinetic energy of an object of mass m, moving with velocity v. Kinetic energy is the energy possessed by an object by virtue of its motion. K.E=1/2 mV² Derivation: Let us consider an object of m which is... 1