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  1. Your question is too vague. If you are raising the ball upt ot 80 cm from ground, the force you exert on the ball is...

  2. 1) Greenhouse gases are the gases that make the earth raise the tempearture. These gases are so large that cause the unbalance...

  3. ... in J C-1 kg-1. It is the energy needed to raise 1 C of a block of 1 kg. If a substance with a high specific heat capacity...

  4. ... a kJ energy per kg K. So, use kJ energy to raise up 1 kg substance for 1 K. . e.g 297 J/kg K is mean...

  5. ...avoid prolong heating of the resistor and rheostat, as a prolong heating would raise their temperature and hence the resistances. Hence, it ...

  6. 5. There is work done and hence produce heat, which raises the temperature of the block. 6. Try to draw the "rays", which...

  7. 11. The answer is C. For 1, as the block is raising , so there is a gain in potential energy of the block. So 1 is correct...

  8. ...of air inside the room = (4x5x7) x 1.2 kg = 168 kg Heat required to raise the room air from 10'C to 20'C = 168 x 1000 x (20-10) J...

  9. ...of the gas, then 0.148 × 4200 = 621.6 J of energy is needed to raise its temperature by 1 K. So, in view of the formula E = (3...

  10. As soon as the load is raised , the rotation speed of the motor will decrase. Then, by the formula: Back...