1. A receiver on a football team runs 8.0 m [E] and then turns abruptly to run...
Question:
1. A receiver on a football team runs 8.0 m [E] and then turns abruptly to run 12.0 m [W]. If the entire motion takes 5.0 s, determine the receiver's: (a) total distance travelled. [2] (b) total displacement. [2] (b) average speed. [2] (c) average velocity. [2]
2. Ms. Fizics pushed a large crate of textbooks (75 kg) down the hall to her office. She pushed as hard as she could and the crate accelerated down the hall at a rate of 1.5 m/s2. There was a coefficient of kinetic friction of 0.48 between the crate and the floor. (a) Draw a free-body diagram for the crate. [2] (b) Determine the net force on the crate. [2] (c) Determine the crate's normal force. [2] (d) Determine the force of friction on the crate. [2] (e) Determine the force exerted by Ms. Fizics. [2]
3. A 125 mL cup of coffee is too cold, 21C, to drink so it is poured into an 83.6 g aluminium container that had been heated up to 100 C. If the coffee and container end up at a temperature of 31C, determine the specific heat capacity of aluminium. [8]
4. A 60 kg snowboarder (including equipment) heads down a ski hill starting at a height of 100 m, from an initial speed of 4.5 m/s above the flat surface at the bottom. Use the Law of Conservation of Energy to determine the speed she could attain by the time she hits the flat (at the bottom of the hill). If she only reaches a speed of 90 km/h what was the energy lost to friction? [6]
5. Use the circuit diagram below to answer the questions that follow.
Expert Answer:
