Complete the following table.
| u (m/s) | a (m/s2) | t (sec) | v = u + at (m/s) |
| 2 | 4 | 3 | - |
| - | 5 | 2 | 20 |
| u (m/s) | a (m/s2) | t (sec) | s = ut + 1/2at2 (m) |
| 5 | 12 | 3 | - |
| 7 | - | 4 | 92 |
| u (m/s) | a(m/s2) | s (m) | v2 = u2 + 2 as (m/s)2 |
| 4 | 3 | - | 8 |
| - | 5 | 8.4 | 10 |
Concept: Motion and Rest
Give scientific reason.
Even though the magnitudes of action force and reaction force are equal and their directions are opposite, their effects do not get cancelled.
Concept: Motion and Rest
Write detailed answer?
Determine the amount of work done when an object is displaced at an angle of `30^circ` with respect to the direction of the applied force.
Concept: Definition of Work
Write detailed answer?
Why is the work done on an object moving with uniform circular motion zero?
Concept: Definition of Work
Solve the following example.
An electric pump has 2 kW power. How much water will the pump lift every minute to a height of 10 m?
Concept: Definition of Work
Solve the following example.
If a 1200 W electric iron is used daily for 30 minutes, how much total electricity is consumed in the month of April?
Concept: Definition of Work
Solve the following example.
The velocity of a car increase from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?
Concept: Definition of Work
Solve the following example.
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
Concept: Definition of Work
Choose one or more correct alternatives.
For work to be performed, energy must be ________
(i) transferred from one place to another
(ii) concentrated
(iii) transformed from one type to another
(iv) destroyed
Concept: Definition of Work
Choose one or more correct alternatives.
Joule is the unit of ________
(i) force
(ii) work
(iii) power
(iv) energy
Concept: Definition of Work
Rewrite the following sentence using proper alternative.
The work done on an object does not depend on _______
Concept: Definition of Work
The following table shows current in Amperes and potential difference in Volts.
What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)
Concept: Electric Potential and Potential Difference
The following table shows current in Amperes and potential difference in Volts.
Which law will the graph prove? Explain the law.
Concept: Electric Potential and Potential Difference
Write answer to the following question and explain your answer.
Explain how the element sodium is monovalent.
Concept: Laws of Chemical Combination
Write down the changes that will be seen in the instance and explain the reason behind it.
Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH.
Concept: Ionic Compounds : Recapitulation
Correct and rewrite the following statement and justify your correction.
Carnivores occupy the second trophic level in the food chain.
Concept: Energy Flow in an Ecosystem
Correct and rewrite the following statement and justify your correction.
The flow of nutrients in an ecosystem is considered to be a ‘one way’ transport.
Concept: Energy Flow in an Ecosystem
Correct and rewrite the following statement and justify your correction.
Plants in an ecosystem are called primary consumers.
Concept: Energy Flow in an Ecosystem
Give reason.
Flow of nutrients through an ecosystem is cyclic.
Concept: Energy Flow in an Ecosystem
Give reason .
Energy flow through an ecosystem is ‘one way’.
Concept: Energy Flow in an Ecosystem
