Car A leaves town heading east with a constant speed of 20 miles/hr. An hour lat
ID: 1701376 • Letter: C
Question
Car A leaves town heading east with a constant speed of 20 miles/hr. An hour later car B leaves town heading east as well, with a constant speed of 25 miles/hr.
5) How long after car B leaves will it intercept car A?
6) A child runs at speed vc, while an adult runs at speed va. If the adult gives the child a head start of distance d, how long will it take for the adult to catch the child? Express your answer in terms of va, vc, and d.
7) When does the ball first reach the y axis?
This graph shows the velocity of an object versus time.
8) At which time does the object change its direction of motion?
9) A car drives east for two hours at 40 miles per hour. After stopping for two hours, it then drives east for another three hours at 60 miles per hour. Which of the following graphs correctly represents the distance versus time for this motion?
Here we have two vectors V and W. The angle between these vectors is A.
10) What is the component of V parallel to W in terms of A and the magnitudes of V and W?
11) What is the component of V perpendicular to W in terms of A and the magnitudes of V and W?
The two vectors A and B are defined as A=(3 m, 4 m) and B=(5 m, -3 m), where the first number is the x-component of the vector, and the second number is the y-component of the vector.
12) What is the magnitude of vector A?
13) What is A + B?
14) In the year 2003 the Acme Company has twice as many employees as managers. During the next 5 years, they hire twelve employees and fire two managers. Which of the following equations is correct for the current number of managers (NM2008) and the current number of employees (NE2008)?
The force on an object in uniform circular motion is given by F = m v2 / r .
15) Consider two equal-mass objects moving around the same circle, one with speed v1 and one with speed v2, where v1 = 2 v2 . What is the ratio of the forces on these two objects?
16) Now the two objects move at the same speed around the same circle but have different masses m1 and m2, where m1 = 2 m2. What is the ratio of the forces on the two objects?
Explanation / Answer
At hour 1 . A=20miles B=0miles at hour2 A=40miles B=25 miles at hour3 A=60miles B=50miles At hour4 A=80 mile B=75 miles At hour5 A=100 miles B=100miles So five hours later...