Question

Shin

想請問這四題

98. A baseball is hit straight up and is caught by the catcher 2.0 s later. The maximum
height of the ball during this interval is:
4.9 m
2÷2=1
XA)
B)
C)
D)
E)
7.4 m
19.4 m
38.8 m
19.6 m
122.
DA
If the x component of a vector A, in the xy plane, is half as large as the magnitude of
the vector, the tangent of the angle between the vector and the x axis is:
A) √3
B) 1/2
C) √3/2
3/2
D)
E)
3
142. Two vectors lie with their tails at the same point. When the angle between them is
increased by 20° the magnitude of their vector product doubles. The original angle
between them was about:
A - B = |A|| B|cos O
2 L² cose = L² cos (0+20²)
2005 = cos@casso. sing sino
A) 0
B) 18°
C) 25°
D) 45°
E) 90°
BA
158. Identical guns fire identical bullets horizontally at the same speed from the same height
above level planes, one on the Earth and one on the Moon. Which of the following three
statements is/are true?
A) III only
B) I and II only
- 0-9 cose-adsint
I. The horizontal distance traveled by the bullet is greater for the Moon.
II.
The flight time is less for the bullet on the Earth.
III. The velocities of the bullets at impact are the same.
I and III only
II and III only
1.1 cos@=-035n9.
tant = 1/3
C)
D)
E) I, II, III
h-Vortat²
xoxt-txt
tu-Jite