|| A rifle shoots a 4.20 g bullet out of its barrel. The bullet has a muzzle velocity of 965 m/s jus: as it leaves the barrel. Assuming a constant horizontal acceleration over a distance of 45.0 cm starting from rest, with no friction between the bullet and the barrel, (a) what force does the rifle exert on the bullet while it is in the barrel? (b) Draw a free-body diagram of the bullet (i) while it is in the barrel and (ii) just after it has left the barrel (c) How many g’s of acceleration does the rifle give this bullet? (d) For how long a time is the bullet in the barrel?
|| A rifle shoots a 4.20 g bullet out of its barrel. The bullet has a muzzle velocity of 965 m/s jus: as it leaves the barrel. Assuming a constant horizontal acceleration over a distance of 45.0 cm starting from rest, with no friction between the bullet and the barrel, (a) what force does the rifle exert on the bullet while it is in the barrel? (b) Draw a free-body diagram of the bullet (i) while it is in the barrel and (ii) just after it has left the barrel (c) How many g’s of acceleration does the rifle give this bullet? (d) For how long a time is the bullet in the barrel?
|| A rifle shoots a 4.20 g bullet out of its barrel. The bullet has a muzzle velocity of 965 m/s jus: as it leaves the barrel. Assuming a constant horizontal acceleration over a distance of 45.0 cm starting from rest, with no friction between the bullet and the barrel, (a) what force does the rifle exert on the bullet while it is in the barrel? (b) Draw a free-body diagram of the bullet (i) while it is in the barrel and (ii) just after it has left the barrel (c) How many g’s of acceleration does the rifle give this bullet? (d) For how long a time is the bullet in the barrel?
|(1) Two objects are connected by a light string that passes over a
frictionless pulley as shown in Figure 2.
is frictionless and take m, =2.00 kg, m = 6.00 kg, and 0 =
55.0°. (a) Draw free-body diagrams of both objects. Find
(b) the magnitude of the accel eration of the objects, (c) the ten-
sion in the string, and (d) the speed of each object 2.00 s after
it is released from rest.
Assume the incline
A 7.00 kg object starting from rest falls through a viscous medium and experiences a resistive force given by Ŕ
5.84 s.
(a) Determine the terminal speed.
57.25
× m/s
=
(b) At what time is the speed of the object three-fourths the terminal speed?
S
(c) How far has the object travelled in the first 5.84 s of motion?
m
-by, where is the velocity of the object. The object reaches one half its terminal speed in
Block A has a mass of 10 kg, and blocks B and c have masses of 5 kg each. Knowing that the blocks are initially at rest and that B moves through 3 m in 2 s, determine (a) the magnitude of the force P, (b) the tension in the cord AD. Neglect the masses of the pulleys and axle friction.
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