Solved Solutions.
When you drop a ball, it accelerates downward at 9.8 m/s². If instead you throw it horizontally,
then its acceleration immediately after leaving your hand, assuming no air resistance, is
a. 9.8 m/s²
b. more than 9.8 m/s²
c. less than 9.8 m/s²
d. Cannot say, unless the speed of throw is given - Answer A
How many vectors shown in the figure (refer ch. 3 test pt. 1, #2) have nonzero horizontal
components?
a. 2
b. 3
c. 4
d. 5 - Answer C
Which vectors shown in the figure (refer ch. 3 test pt. 1, #3) have vertical components that are
equal?
a. d₁ and d₂
b. d₁ and d₃
c. d₂ and d₅
d. d₄ and d₅ - Answer B
Which of the curves on the graph (refer ch. 3 test pt. 1, #4) best represents the vertical
component vy of the velocity versus time t for a projectile fired at an angle 45° above the
horizontal?
a. OC
b. DE
c. AB
d. AE
e. AF - Answer D
, b. DE
c. AB
d. AE
e. AF - Answer C
A 2-kg mass and a 4-kg mass on a horizontal frictionless surface are connected by string A
having negligible mass. The 2-kg mass is on the right, and is pulled horizontally to the right by a
second string B (also having negligible mass), resulting in a constant acceleration of 12 m/s².
What is the magnitude of the tension in string B on the 2-kg mass?
a. 72 N
b. 48 N
c. 24 N
d. 6 N
e. 3 N - Answer A
A 2-kg mass and a 4-kg mass on a horizontal frictionless surface are connected by string A
having negligible mass. The 2-kg mass is on the right, and is pulled horizontally to the right by a
second string B (also having negligible mass), resulting in a constant acceleration of 12 m/s².
What is the magnitude of the tension in string A on the 4-kg mass?
a. 72 N
b. 48 N
c. 24 N
d. 6 N
e. 3 N - Answer B
A 2-kg mass and a 4-kg mass on a horizontal frictionless surface are connected by string A
having negligible mass. The 2-kg mass is on the right, and is pulled horizontally to the right by a
second string B (also having negligible mass), resulting in a constant acceleration of 12 m/s².
What is the magnitude of the net force on the 2-kg mass?
a. 72 N