41. When you weigh yourself on good old terra firma (solid ground), your weight is 142 lb. In an elevator your apparent weight is 121 lb. What are the direction and magnitude of the elevator's acceleration?

Rising fast ball. A batter in a baseball game will sometimes describe a pitch as being a rising ball, termed a hop. Although technically possible, such upward motion would require a large backspin on the ball so that an aerodynamic force would lift the ball. More likely, a rising ball is an illusion stemming from the batter's misjudgment of the ball's initial speed. The distance between the pitching rubber and home plate is 60.5 ft. If a ball is thrown horizontally with no spin, how far does it drop during its flight if the initial speed vo is (a) 36 m/s (slow, about 80 mi/h) and (b) 43 m/s (fast, about 95 mi/h)? (c) What is the difference in the two displacements? (d) If the batter anticipates the slow ball, will the swing be below the ball or above it? (a) Number i (b) Number (c) Number (d) MO Units Units Units

Q1. A 2 kg bob moves along a circular path in the vertical plane. When the bob is at the highest point, the bob has a speed of 6 m/s. Determine the tension in the cord at this moment 2m

7. Sally is driving at a constant speed of 25 m/s on a straight horizontal road. She sees an obstacle on the road ahead and applies the brakes! The wheels lock causing the car to slide forward. If the coefficient of kinetic friction between the tires and the road is 0.40, how long does it take the car to come to a complete stop?

A. a2=a1/3 B. a2=3a1 C. a2=a1/9 D. a2=a1 E. a2=9a1

A 15 foot ladder is resting against the wall. The bottom is initially 10 feet away from the wall and is being pushed towards the wall at a rate of 4 ft/sec. How fast is the top of the ladder moving up the wall 12 seconds after we start pushing? 2.

9. A ball is thrown into the air and follows a parabolic trajectory. At the highest point in the trajectory. Select one: a. The velocity is zero, but the acceleration is not zero b. both the velocity and acceleration is not zero c. the acceleration is zero, but the velocity is not zero d. neither the acceleration nor the velocity are zero

11.Determine the acceleration a. The masses are: m, = 1 kg, m2 = 2 kg, m3 = 4 kg %3D The coefficient of kinetic friction between mass 1 and the incline is M1 = 0.4 The coefficient of kinetic friction between mass 2 and the flat section is Hz = 0.3 a T1 T2 a Tj m2 T2 m1 H2 a m. H1 30°

10. You're out in space, on a rotating wheel-shaped space station of radius 551 m. You feel planted firmly on the floor , due to artificial gravity. The gravity you experience is Earth-normal, that is, g = 9.81 m/s^2. How fast is the space station rotating in order to produce this much artificial gravity? Express your answer in revolutions per minute (rpm).      1.019 rpm      1.274 rpm      0.133 rpm      73.5 rpm

Your friend and you are both in Calgary for a chesstournament. You each drive your own vehicle to CrossIronMills mall. You take Stoney Trail (a freeway that goesaround the city) and your friend takes Deerfoot Trail (afreeway that goes through the city). Explain how you accelerated your car by turning the steering wheel whilemaintaining a constant speed.