3 x 107 J Gun and bullet hit the ground at the same time. 380 J kg-1 °C-1 25 km They fall at the same rate. 2.5 °C 7890 N 2 s (a) 6 m s-1 12 kg 6960 J (a) 105 m (a) 618 J kg-1 °C-1 4.5 N 30 m s-1 The experimental value is larger. This is because (a) 1162.5 m not all heat energy is 0 m absorbed by the copper 155 m s-1 block. Air resistance will slow the box. A projectile with a high enough horizontal velocity will fall with the curvature of the Earth, staying in orbit. Specific Heat Capacity Specific Latent Heat (p28 - 30) Projectile Motion (p22 25) – (p26 27) – (a) The energy required to A projectile has vertical 4180 J of heat energy is change 1 kg of a liquid and horizontal motion at needed to change the in to a gas OR the the same time. temperature of 1 kg of energy out by 1 water by 1 °C. kg of a gas turning in 27 m s-1 to a liquid. (a) 47 000 J The energy required to (a) 9.8 m 112 750 J change 1 kg of a solid in 41.8 m 4100 J kg-1 °C-1 to a liquid OR the 270 J / J kg-1 °C-1 energy given out by 1 (a) 25.6 m 0.4 kg kg of a liquid turning in 2.24 m 5.5 kg to a solid. 7.5 °C Monkey gets struck by 4 °C (a) Melting It falls at the same Evaporating rate as the arrow. 752 400 J Freezing
3 x 107 J 25 km 7890 N 6960 J 4.5 N Projectile Motion (p22 – 25) A projectile has vertical and horizontal motion at the same time. 27 m s-1 (a) 9.8 m 41.8 m (a) 25.6 m 2.24 m Monkey gets struck by It falls at the same rate as the arrow. Gun and bullet hit the ground at the same time. They fall at the same rate. (a) 2 s 6 m s-1 (a) 105 m 30 m s-1 (a) 1162.5 m 0 m 155 m s-1 Air resistance will slow the box. A projectile with a high enough horizontal velocity will fall with the curvature of the Earth, staying in orbit. Specific Heat Capacity (p26 – 27) 4180 J of heat energy is needed to change the temperature of 1 kg of water by 1 °C. (a) 47 000 J 112 750 J 4100 J kg-1 °C-1 270 J / J kg-1 °C-1 0.4 kg 5.5 kg 7.5 °C 4 °C 752 400 J 380 J kg-1 °C-1 2.5 °C 12 kg (a) 618 J kg-1 °C-1 The experimental value is larger. This is because not all heat energy is absorbed by the copper block. Specific Latent Heat (p28 - 30) (a) The energy required to change 1 kg of a liquid in to a gas OR the energy out by 1 kg of a gas turning in to a liquid. The energy required to change 1 kg of a solid in to a liquid OR the energy given out by 1 kg of a liquid turning in to a solid. (a) Melting Evaporating Freezing