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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. Takeg = 10 m/s² K.E. = (1/2) m v² Gravitational PE = m g h Work done = F s ==== 1. KE of the bowling ball = (1/2) × 7 × 2² = 14J KE of the tennis ball = (1/2) × (60/1000) × 40² =48...

  3. ...of the incident photon is absorbed by the target atom, which is raised to an excited state. The energy of the photon decreases...

  4. Heat required to raise the temperature of 1 kg water from 0'C to 100'C = 1 x 4200 x...

  5. ... = 0.03 x 2.26x10^6 J = 67 800 J Heat needed to raise the temperature of 0.1 kg water from 0'C to 100'C = 0.1 x 4200...

  6. 1(a) Kinteic energy = (1/2).(0.01).(10^2) J = 0.5 J (b) Potential energy = 0.5 J (By conservation of energy) (c) Max height = 0.5/0.01g m = 5 m where g is the accleration due to gravity, taken to be 10 m/s^2 (d) Kinetic energy = 0.5 J...

  7. ...28 15:14:08 補充: For conservative force, take gravitation as an example, when you raise an object from the floor with your hand, you are doing work. ...

  8. ...40:07 補充: Your suppl question: Clearly, the power needed to raise the mass with higher speed ( 5 m/s) is larger. In time...

  9. ... increases. If the temperture of the solid is further raised , molecular separation continues to increase, until at a point in temperature (the...

  10. 1. In 1 minute, the elevator rises = 30 x 60 cm = 1800 cm = 18 m Hence, rotational speed of disk = 18/(pi.2.5) rpm = 2.292 rpm 2. Angular acceleration = (g/8)/(2.5/2) rad/s^2 = 1 rad/s^2 where g is taken to be 10 m/s^2 3. Angle turned by the disk = 2...