The speed of a 2.0-kg object changes from 30 m/s to 40 m/s during a 5.0-s time interval. During this same time interval, the velocity of the object changes its direction by 90. What is the magnitude of the average total force acting on the object during this time interval?
a. 30 N
b. 20 N
c. 40 N
d. 50 N
e. 6.0 N
Question 2
A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30 below the horizontal just before it strikes a horizontal surface. The ball leaves this surface 0.50 s later with a velocity of 2.0 m/s directed 60 above the horizontal. What is the magnitude of the average resultant force on the ball?
a. 14 N
b. 11 N
c. 18 N
d. 22 N
e. 3.0 N
The Geologic Time Scale
Time Line of Human History From Upper Paleolithic Period to the Present
Shy children often have a high arousal level in novel social situations. Over time, parents can help ...
A rapidly vibrating needle at idle that becomes steady as engine speed is increased indicates worn ...
When a 2.75-kg fan, having blades 18.5 cm long, is turned off, its angular speed decreases ...
Time-of-entry mapping