University:
Campbell University
Course:
PHYS 221 | General Physics I
Academic year:

2024
Views:

107

Pages:

4
Author:

penuchelnu1

1. 15m/s 2.7200m/s 3.11.25 4.40.m/s 5.-4.5m/s 6.4.0s 7.2.9m/s², 2.6m/s², 2.8m/s² 8.a 4m/s b. 6m/s c.3.0m/s d. 2.0m/s 0m/s b. 1.0m/s c.-0.67m/s² d. 0.75m/s² 10. 11.2m/s b. 5.60m/s c. 44.8m 11a. 0.50m/s b. 1.0m/s c. 0.25m/s 12.375m 13a. 7.45m/s b.31.3m 148, 60m b. 70.m c. 10,m 15a. 60.m b. 50.m c. 5.Denis d. 2.08 Honours Distance and Acceleration distance covered by an object traveling at a constant velocity is calculated using the equation Ad vAt If the object is accelerating, this equation can not be used. However, if the acceleration is constant, the graph of this motion would be a straight line. The average velocity is calculated Vaverage Vot 2 where vo is the initial velocity and vy is the final velocity Then the distance traveled by an object with constant acceleration is Ad = Vaverage At ог Ad = (+) At How far does a bus travel in 10.0s if it starts at 2.0m/s, accelerates steadily at 1.0m/s, and has a final velocity of 12m/s? A car rolling down a hill accelerates from rest to 22m/s in 40.0s. a. What is the average velocity of the car? b. What is the distance the car rolls down the hill? 1. What is the average speed of a ball bearing rolling down a ramp, accelerating steadily from 8.0m/s to a. 12m/s b. 18m/s c. 24m/s 2. How far does a dragster travel in 6.00s, accelerating steadily from 0m/s to 90.0m/s? 3. A skateboarder accelerates steadily from 4.5m/s to 11.5m/s in 6.0s. How far does she travel? Constant Acceleration from Rest: consider the equation Ad= At 2 If there is constant acceleration and the object starts from rest, then 20 so that Av=v V d=0 to=0 dy-d so that Ad=d ty-t so that Att Δυ Now a = At t which we can rearrange into vat and substituting that into the original How far down a smooth ramp does a 5.0 kg cart roll in 8.0s accelerating from rest at 2.5m/s²? 4. A skier accelerates at 1.20m/s² down an icy slope, starting from rest. How far does she get in a. 5.0s b. 10.0s c. 15.05 5. What is the acceleration of an object that accelerates steadily from rest, traveling 10.0m in 10.0s? 6. How long does it take an airplane, accelerating from rest at 5.0 m/s², to travel 360 m? Is it possible to calculate final velocity with what we know so far? Constant acceleration is the slope of a velocity time graph At zero time the initial velocity is vo At time t, the velocity is vr Using this information, what is the equation of the line? If a car with velocity of 2.0m/s at t = 0 accelerates at a rate of 4.0m/s² for 2.5s, what is its velocity at t-2.5s? 7. A golf ball rolls up a hill toward a mini-golf hole. a. if it starts with a velocity of 2.0m/s and accelerates at a constant rate of-0.50m/s², what is its velocity after 2.0s? b. if the acceleration occurs for 6.0s, what is its final velocity? 8. A bus traveling at 30.0 km/hr accelerates at a constant 3.5m/s for 6.8s. What is its final velocity in km/hr?