A force F → = (3.00 N) i ^ + (7.00 N) j ^ + (7.00 N) k ^ acts on a2.0 kg mobile object that moves from an initial position of d → i = (3.00 m) i ^ − (2.00 m) j ^ + (5.00 m) k ^ to a final position of d → f = −(5.00 m) i ^ + (4.00 m) j ^ + (7.00 m) k ^ in 4.00 s. Find (a) the work done on the object by the force in the 4.00 s interval, (b) the average power due to the force during that interval, and (c) the angle between vectors d → i and d → f .
A force F → = (3.00 N) i ^ + (7.00 N) j ^ + (7.00 N) k ^ acts on a2.0 kg mobile object that moves from an initial position of d → i = (3.00 m) i ^ − (2.00 m) j ^ + (5.00 m) k ^ to a final position of d → f = −(5.00 m) i ^ + (4.00 m) j ^ + (7.00 m) k ^ in 4.00 s. Find (a) the work done on the object by the force in the 4.00 s interval, (b) the average power due to the force during that interval, and (c) the angle between vectors d → i and d → f .
A force
F
→
= (3.00 N)
i
^
+ (7.00 N)
j
^
+ (7.00 N)
k
^
acts on a2.0 kg mobile object that moves from an initial position of
d
→
i
= (3.00 m)
i
^
− (2.00 m)
j
^
+ (5.00 m)
k
^
to a final position of
d
→
f
=−(5.00 m)
i
^
+ (4.00 m)
j
^
+ (7.00 m)
k
^
in 4.00 s. Find (a) the work done on the object by the force in the 4.00 s interval, (b) the average power due to the force during that interval, and (c) the angle between vectors
d
→
i
and
d
→
f
.
force F = (7.20 N)Î + (8.40 N)Î + (4.50 N) Ê acts on a 8.90 kg mobile object that moves from an initial position of d; = (7.00 m)î + (3.50 m)ĵ + (7.80 m) Ê
o a final position of áf = (2.20 m) î + (3.70 m)} + (4.30 m) k in 9.80 s. Find (a) the work done on the object by the force in the 9.80 s interval, (b) the average
ower due to the force during that interval, and (c) the angle between vectors d; and år.
a) Number
Units
b) Number
Units
c) Number
Units
A worker pushes a 35.0-kg package on a horizontal roller-belt conveyor until it reaches a certain speed. The package then coasts on the horizontal conveyor, all the while slowing down, until it
comes to a complete stop after moving 1.20 m. While the package is coasting on the conveyor, the opposing friction force averages 6.00 N. Use the WET to find the speed of the package
after the worker pushes it and just as it begins to coast.
0.625 m/s
0.759 m/s
0.600 m/s
0.510 m/s
0.802 m/s
0.641 m/s
A force É = (5.90 N )î + (5.40 N )f + (6.40 N )k acts on a 1.20 kg mobile object that moves from an initial position of
(4.20 m )î + (2.10 m )ŷ + (7.40 m )k to a final position of á f = (5.90 m )î + (8.20 m )ŷ + (5.50 m )k in 5.70 s.
i
Find (a) the work done on the object by the force in the 5.70s interval, (b) the average power due to the force during that interval, and
(c) the angle between vectors d ; and d f.
i
(a) Number
i
Units
(b) Number
i
Units
(c) Number
i
Units
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
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