A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at eye level) by the catcher. At what point does the magnitude of the vertical component of velocity have its maximum value? (air resistance is negligible)
a. just after leaving the center fielder's hand
b. just before arriving at the catcher's mitt
c. at the top of the trajectory
d. the magnitude of vertical component of velocity is constant
[Ques. 2] A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point is the magnitude of the acceleration at a minimum? Note: Air resistance is negligible.
a. just after leaving the center fielder's hand
b. just before arriving at the catcher's mitt
c. at the top of the trajectory
d. acceleration is constant during the entire trajectory
[Ques. 3] A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at an equal shoulder level) by the catcher. At what point is the ball's speed at a minimum? Note: Air resistance is negligible.
a. just after leaving the center fielder's hand
b. just before arriving at the catcher's mitt
c. at the top of the trajectory
d. speed is constant during entire trajectory
[Ques. 4] A baseball thrown from the outfield is released from shoulder height at an initial velocity of 39.2 m/s at an initial angle of 30.0 with respect to the horizontal. What is the maximum vertical displacement that the ball reaches during its trajectory?
a. 11.0 m
c. 22.1 m
b. 19.6 m
d. 44.1 m
[Ques. 5] A baseball thrown from the outfield is released from shoulder height at an initial velocity of 39.2 m/s at an initial angle of 30.0 with respect to the horizontal. If it is in its trajectory for a total of 4.00 s before being caught by the third baseman at an equal shoulder-height level, what is the ball's net vertical displacement during its 4.00-s trajectory?
a. 11.0 m
c. 22.1 m
b. 9.80 m
d. zero
[Ques. 6] John throws a baseball from the outfield from shoulder height, at an initial velocity of 39.2 m/s at an initial angle of 30.0 with respect to the horizontal. The ball is in its trajectory for a total interval of 4.00 s before the third baseman catches it at an equal shoulder-height level. (Assume air resistance is negligible.) What is the ball's horizontal displacement?
a. 76.4 m
c. 136 m
b. 38.2 m
d. zero
[Ques. 7] A projectile is fired over a horizontal surface at an angle of elevation of 70. Neglecting air resistance, what are possible angles in flight between the acceleration vector and the velocity vector?
a. 170 and 40
c. 90 and 15
b. 120 and 70
d. none of the above
[Ques. 8] A 200-N block, on a 30 incline, is being held motionless by friction. The coefficient of static friction between the block and the plane is 0.60 . The force due to friction is:
a. 104 N.
c. 60 N.
b. 100 N.
d. 0 N.
[Ques. 9] The coefficient of static friction between the tires of a car and the street is s = 0.58 . Of the following, what is the steepest inclination angle of a street on which a car can be parked (with wheels locked) without slipping?
a. 22.5
c. 38
b. 30
d. 45
[Ques. 10] A 200-N crate rests on a ramp; the maximum angle just before it slips is 21 with the horizontal. What is the coefficient of static friction between crate and ramp surfaces?
a. 0.11
c. 0.38
b. 0.21
d. 0.47
Quick Reply
