Recitation 3
385 00 The range of a cannonball fired horizontally from a cliff is equal to the height of the cliff.
What is the direction of the velocity vector of the projectile as it strikes the ground? (Ignore any effects
due to air resistance.)
384
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an
ll
Recitation 9
29  Find A X if for the following choices:(a)/1 = 4; andl}= 6; + 61:, (b) {group} A = 42' and
=6E+6I2,and(c)[group)A=22+3j and I}: 3t:+2]:.
_, — . ,1. . j 15 A.
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Z'i
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Recitation 7
Problem H Bored, a boy shoots his pellet gun at a piece of cheese that sits, keeping cool for
dinner guests, on a massive block of ice. On one particular shot, his 1 g pellet gets stuck in the
cheese, causing it to slide 25 cm before coming t
Recitation 8
64 0 The particles in Figure 952 are connected by a very light rod. They rotate about the
y axis at 2.0 rad/s. (0) Find the speed of each particle, and use it to calculate the kinetic energy
of this system directly from Z§mivi2 . (b) Find th
2 1\
Recitation I
\38 The 51 unit of force , the kilogrammeter per second squared (kg mI 52) is called the
newto n (N). Find the dimensions and the 51 units orlhe constant G in Newto n's law of
gravitutio n F = Gm,ml / I,
F~

G
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en
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Recitation 2
239 On June 14, 2005, Asafa Powell of Jamaica set a world's record for the 100m dash with a
time t = 9.77 s. Assuming he reached his maximum speed in 3.00 s, and then maintained that
speed until the ﬁnish, estimate his acceleration during t
Recitation 5
Problem  A 2.0kg particle is given a displacement of A? = (3.0 m)lC +(3.0 + (— 2.0
During the displacement, a constant force F = (2.0 —(l .0 N)}'+ (l .0 N)I2 acts on the particle. (0)
Find the work done by i' for this displacement. (b) ang
Recitation 6
31 H The potential energy of a 4.0—kg object constrained to the x axis is given by U = 3X2 ——x3 for x
s 3.0 m and U = 0 forx 2 3.0 m, where U is in joules and x is in meters, and the only force acting on this
object is the force associated wi
Recitation 4
57 u A 60.0kg block slides along the top of a 100kg block. The 60.0kg block has an acceleration
of 3.0 m/s2 when a horizontal force of 320 N is applied, as in Figure 567. There is no friction between
the 100kg block and a horizontal fric
Recitation 10
68
the bullet stOpping in it. How far will the block slide before coming to a stop? The mass of the bullet is 10.5 g, the
mass of the block is 10.5Kg, the bullet’s impact speed is 750 m/s, and the coefficient of kinetic friction between the