- Mickey pushes a lawnmower forward 1000 m with some force of 2 2 lbs or 98 N at various angles. Find the work done if Mickey A) pushes downwards at a 30 degrees angle, B) pushes flat at a 0 degrees angle , C) pushes upwards at a 30 degrees angle. Does it make sense that we would get different answers? Why or Why Not? Would it require us to use different lawnmowers or different terrain?

- *** Minnie 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 Minnie burns off if Minnie pulls at an angle of A) forward 10 degrees up, B) forward or flat or 0 degrees , C) forwards 10 degrees down.

- Donald and Daisy 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? -3 -

- *** Goofy and Pluto use a cylindrical spring launcher to launch a 150 g baseball at a 45 degrees angle above the horizontal. The spring is compressed 50 cm with a stiffness of 1 113.63 N/ m and the ball exits the launcher at a height of 1.8536 m. Friction and changes in gravitational energy are essentially negligible inside the spring launcher only stealing 3.9287 J of kinetic energy. A) Determine the muzzle velocity of the baseball. B) How far away the baseball will land from the launcher ? (This question is similar to AS01F q - Ms. Saturn)

- Jiminy Cricket 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.

- Tinkerbell throws a 0.624 kg basketball upwards from a height of 1. 0 m with an initial speed of 10 m/ s. Assume the process is 95.0% efficient due to air friction. Use conservation of energy to determine the speed of the basketball when it reaches a height of 3 m. -6 -

- Scrooge McDuck, Huey, Duey and Luey have a comb ined mass of 100 kg. They initially are on a diving board which is 4.9 m high on a diving board of stiffness 1250 N/ m which has been bent 150 cm. They experience an average of 0.25 g's of drag during the displacement downwards to the water below. Deter mine their impact velocity.

- *** Chip n' Dale 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 cannon ball.

-Walt Disney is atop a 50 m high roller coaster hill with negligible speed. He comes down the hill and enters a loop -de -loop of radius 10 m which starts at a height of 5 m. Due to drag he enters the loop with only 80% of his total mechanical energy and when he reaches the top of the loop he only has 70% of his total mechanical energy. Is this coaster safe? Find the speed at the bottom and top of the loop and then determine the g -force s using the formula derived in AS03 for loop -de -loop problems. Remember 10g's will cause a fighter pilot in a g -suit to pass out. One second at 6 g's is the limit for amusement park rides. -9 -

- (EXTRA CREDIT) Stitch is an Olympic shotput tosser and visits dancing wi th the stars. Stitch picks up his ballet dance partner Lilo who masses 45 kg and overcoming gravity tosses her upwards and forwards with an average force of 3 000 N [Fwd 60 o Up] for 0.2 s from an intial height of 0.25 m and releasing Lilo at some launch angle less than 60 o . at some height greater than 0.25 m. Gravity is acting on Lilo as well. Determine her launch velocity and then determine how far away she will land. (This question is similar to AS01F q - Mr. Neptune & Ms. Pluto )

1 Archie has a mass of 75 kg and a speed of 8.0 m/s. Determine his momentum and kinetic energy. 2 Find the energy and momentum of a photon A) of red light of wavelength 689 nm. B) of 1.5x 1015 Hz UV photon. C) of a green laser beam ofpower 1 mW red for 1.0 S of wavelength Of 5 50 um (gel photon energy, beam energy, it of photons, photon momentum, beam momentum 7 in that order) 3 Veronica has a mass of 60 kg and an initial speed of 5.0 m/s. She slows down with an impulse of 100 N's. Find her nal speed. -3 4 Jughead has an initial speed of 2.5 m/s and a nal speed of 5.5 m/s after experiencing an impulse of 240 N's. Determine his mass. 5 i Reggie hits a 150 g baseball with an overall force of 7 369 N [E 30" U] {his force and the force of gravity combined}. The collision takes 1.25 ms. The initial velocity of the ball is 144 kin/h [W]. Determine the nal velocity of the ball. 6 7 Betty has a mass of 60 kg and is standing at rest on a raft of20 kg moving at 5.0 m/s [E]. She starts walking East at 2.0 m/s relative to the raft. Determine the new velocity of the ra relative to the river bank. ---6 7 i Moose the astronaut with a backpack have a mass 150 kg. He is on a spacewalk and is stranded 10 m away from the space station hatch. He removes and throws his 25 kg pack away from the space station with 500 N of force for 0.50 s. How long will it take Moose to reach the hatch? 8. A 50 kg gure skater moving West at 18 m/s and collides with a 90 kg hockey player moving East at 12 m/s. They collide perfectly elastically 7 determine their nal velocities. i a: I .I-'U' 9. A quarter tonne bike runs a red light doing 180 km/h [N]. A 10 tonne delivery truck is making a turn at 36 km/h [NE] when the bike collided into it. If they become stuck together then determine their final velocity and heat loss. Physics Incorporated 10. A 20 kg curling rock was tampered with and some TNT was placed in its center providing 4 184 J per g. The rock is initially moving forward at 5 m/s and then the TNT detonates splitting the rock into 3 pieces. An 10 kg pieces flies forward at 100 m/s and a 6 kg piece flies right at 150 m/s. Find the velocity of the 3rd piece and the amount of TNT used to cause this ridiculous sabotage 11 - Midge has a mass of 50 kg and an initial velocity of 5.0 m/s [N]. She grabs onto a shopping cart at rest of mass 20 kg in a manner that is perfectly inelastic. Determine the velocity of Midge and the cart after the she grabs onto it. 12 - Sabrina the teenage witch animates a tennis ball of mass of 60 g to fly west at 108 km/h. It collided perfectly elastically with the back of Dilton's head. Dilton has a mass of 60 kg and an initial velocity of 3.0 m/s [W]. Determine the final velocities of the tennis ball and Dilton. Perhaps the genius Dilton shouldn't say he is a supporter of the Salem witch trials in front of Sabrina. ---9 13 - Chuck shoots a cue ball at 20 m/s, which then strikes the eight ball directly. The eight ball has twice the mass and the collision is perfectly elastic. Determine the final velocities of the cue ball and eight ball.14 Mr. Weatherbee has a mass of 100 kg and an initial velocity of 3.41 m/s [E]. A 1.0 g supery ying at west at Mach 10 accidentally collides with him, slowing him down to 3.40659 m/s. Find the new velocity of the supery and determine the if the collision was relatively elastic or inelastic by checking the energy lost in the collision which generates heat, sound, vibrations and light. 15 7 Pop Tate has a mass of 100 kg and velocity of 1.0rr1/s [N]. He collides with Ethel who has a mass of 50 kg and velocity of 4.0 mfs [E]. Determine their nal velocities if they hold onto each other (inelastic collision)? ".12 16 Coach Clayton and Mr. Lodge both have a mass of80 kg. They have respective initial velocities of 1.0 m/s [E] and 2.0 m/s [N] and collide. Mr. Lodge ends up moving NE at 1.5 m/s. Determine the nal velocity of Coach Clayton. Check if it is relatively elastic or inelastic ex. If total initial kinetic energy was 100 J and heat loss was 0.1 I that is more elastic but if it is 40 J that is more inelastic for sure. 17 An X-ray photon has a frequency of 5X 1016 Hz is moving East absorbed by a Hydrogen atom initially moving West at 1m/s. Determine the nal velocity of the Hydrogen atom and the heat loss in electronVolts (leV = 1.6>