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Physics
Physics
Problem
At a particular instant, a particle experiences a force
F
=
(
4
N
)
i
^
+
(
3
N
)
j
^
\mathbf F = (4\,\text{N})\,\hat i + (3\,\text{N})\,\hat j
F
=
(
4
N
)
i
^
+
(
3
N
)
j
^
while its velocity is
v
=
(
−
2
m/s
)
i
^
+
(
5
m/s
)
j
^
\mathbf v = (-2\,\text{m/s})\,\hat i + (5\,\text{m/s})\,\hat j
v
=
(
−
2
m/s
)
i
^
+
(
5
m/s
)
j
^
. What is the instantaneous power (in watts) delivered to the particle by the force at that instant? a)
+
26
W
+26\,\text{W}
+
26
W
b)
+
7
W
+7\,\text{W}
+
7
W
c)
−
7
W
-7\,\text{W}
−
7
W
d)
+
14
W
+14\,\text{W}
+
14
W
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