The x and y components of four vectors a → , b → , c → and d → are given below. For which vectors will your calculator give you the correct angle 8 when you use it to find θ with Eq. 3-6? Answer first by examining Fig. 3-12, and then check your answers with your calculator. a x = 3 a y = 3 c x = − 3 c y = − 3 b x = − 3 b y = 3 d x = 3 d y = − 3 a = a x 2 + a y 2 and tan θ = a y a x (3-6) Figure 3-12 Three useful curves to remember. A calculator's range of operation for taking inverse trig functions is indicated by the darker portions of the colored curves.
The x and y components of four vectors a → , b → , c → and d → are given below. For which vectors will your calculator give you the correct angle 8 when you use it to find θ with Eq. 3-6? Answer first by examining Fig. 3-12, and then check your answers with your calculator. a x = 3 a y = 3 c x = − 3 c y = − 3 b x = − 3 b y = 3 d x = 3 d y = − 3 a = a x 2 + a y 2 and tan θ = a y a x (3-6) Figure 3-12 Three useful curves to remember. A calculator's range of operation for taking inverse trig functions is indicated by the darker portions of the colored curves.
The x and y components of four vectors
a
→
,
b
→
,
c
→
and
d
→
are given below. For which vectors will your calculator give you the correct angle 8 when you use it to find θ with Eq. 3-6? Answer first by examining Fig. 3-12, and then check your answers with your calculator.
a
x
=
3
a
y
=
3
c
x
=
−
3
c
y
=
−
3
b
x
=
−
3
b
y
=
3
d
x
=
3
d
y
=
−
3
a
=
a
x
2
+
a
y
2
and tan
θ
=
a
y
a
x
(3-6)
Figure 3-12 Three useful curves to remember. A calculator's range of operation for taking inverse trig functions is indicated by the darker portions of the colored curves.
The cylindrical beam of a 12.7-mW laser is 0.920 cm in diameter. What is the rms value of the electric field?
V/m
Consider a rubber rod that has been rubbed with fur to give the rod a net negative charge, and a glass rod that has been rubbed with silk to give it a net positive charge. After being charged by contact by the fur and silk...?
a. Both rods have less mass
b. the rubber rod has more mass and the glass rod has less mass
c. both rods have more mass
d. the masses of both rods are unchanged
e. the rubber rod has less mass and the glass rod has mroe mass
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