Problem Sheet 6: GE 208K
1.
A 4.00 kg ball has velocity of 4.00i m/s at one instant. 8 seconds later its velocity is
(8.00i+10.00j) m/s. Find the components of force and its magnitude.
2
An electron of mass 9.11 x 10
31
kg has an initial speed of 3.00 x 10
5
m/s. It travels in a
straight line and its speed increases to 7.00 x 10
5
m/s in a distance of 5.00 cm. Assuming
its acceleration is constant,
a.
Determine the force exerted on the electron and
b.
Compare this force with the weight of the electron, which we neglected.
3
Besides its weight, a 2.80 kg object is subjected to one other constant force. The object
starts from rest and in 1.20 s experiences a displacement of (4.20
i
3.30
j
) m where the
direction
j
is upward in the vertical direction. Determine the other force.
4
If a man weighs 900N on the Earth, what would he weigh at Jupiter where the
acceleration due to gravity is 25.9m/s2?
5
Three forces acting on an object are given by
F
1
=(2.00
i
+ 2.00
j
) N,
F
2
=(5.00
i
3.00
j
) N,
and
F
3
=(45.00
i
) N. The object experiences an acceleration of magnitude 3.75 m/s
2
.
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 Spring '11
 Dutt
 Force, Friction, Mass, kg

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