Hi I need answers to these questions:

1. George pulls a 300 kg sleigh horizontally 5 km at a constant velocity of 1.5 m/s. The coefficient of friction is 0.100. If 1 kcal = 4 184 J and 1 Timbit = 70 kcal and Minnie is 25% efficient then determine how many Timbits George burns off if George pulls at an angle of A) forward 10o up, B) forward or flat or 0o, C) forwards 10o down.

(Answer George : A) Woutput = 1 445 000 J, UfoodInput = 19.7 timbits, B) Woutput = 1 470 000 J, UfoodInput = 20.1 timbits, C) Woutput = 1 496 000 J, UfoodInput = 20.4 timbits)

2. Jesica and Rose uses 5 kg of coal to accelerate a 20 tonne train engine from rest with an engine efficiency of 10%. If 1 kg of coal can provide 35 MJ of thermal energy then determine the final velocity of the train if we ignore air friction. If we did factor in air friction would the train end up faster or slower than our nave answer?

(Answer: Jesica and Rose: vf = 41.83 m/s or 151 km/h (obviously ignoring drag is unrealistic), slower if we factor in drag)

3. Monicka Cloni has a mass of 25 kg, is initially moving at 5.00 m/s as he leaps off a 19.6 m high building.A) Ignore air friction and determine his impact speed when he reaches the water. B)Determine the impact velocity if air friction generates 100 J of heat.

(Answer: - Monicka Cloni : E_i = E_f+ Q, A) v_f = 20.2 m/s, B) v_f = 20.0 m/s)

4. Rock's Foly drops a 20.0 kg cannon ball from a height of 10.0 m with an initial speed of 4 m/s [Down]. It lands on a spring which is 100 cm long and has a stiffness of 7 363.6 N/m. If the system is 90% efficient then determine how much the spring compresses to stop the cannonball.

(Answer: Rock's Foly :E_i = E_f+ Q & 1 m = x_f + h_f, quadratic, x_f = 70.9 cm (correct or -65.5 cm (inadmissible)

Please Note: (steps will be confirmed step by step into the results of the answers)

Resources : Work-Energy-Mechanical Energy-Kinetic Energy -Elastic Energy- Gravitational Energy-(Total Mechanical Energy)-Elastic/Spring Energy )