Question

十万火急～！！高分悬赏大学英文的物理练习题..

1) A particle initially located at the origin has an acceleration of = 2.00 m/s2 and an initial velocity of 0 = 7.00 m/s.
(a) Find the vector position at any time t (where t is measured in seconds).
(____t + ____t2 ) m
Find the vector velocity at any time t.
( ___ + ____t ) m/s

(b) Find the coordinates of the particle at t = 2.00 s.
x = ___ m
y = ____ m
Find the speed of the particle at this time.
____ m/s

2)Consider a planet of radius 5.93 106 m with a rotation period of 21.8 hours. Compute the radial acceleration of a point on the surface of the planet at the equator due to its rotation about its axis.
_______ m/s2 (directed toward the center of the planet)

3) A juggler performs in a room with a ceiling 2.58 m above hand level. What is the maximum upward speed (in m/s) which she can give a ball without letting it hit the ceiling?
________ m/s

4) A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.60 m/s at an angle of 16.0° below the horizontal. It strikes the ground 6.00 s later.
(a) How far horizontally from the base of the building does the ball strike the ground?
______ m
(b) Find the height from which the ball was thrown._______ m
(c) How long does it take the ball to reach a point 10.0 m below the level of launching?
________ s

6) A car travels due east with a speed of 45.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 45.0° with the vertical. Find the velocity of the rain with respect to the following reference frames.
(a) the car
__________ m/s

(b) the Earth
_________ m/s

Answer 1

1) a) 7 1 7 2 b)14 4 11
2)3.8*10e-2
3)7.11
4)a)49.60 b)190.62 c)1.21
6)a)17.68 b)12.5