求高人解决几道英语物理题？翻译和解答

10 A positively charged glass rod attracts object X.
The net charge of object X
(1) may be zero or negative
(2) may be zero or positive
(3) must be negative
(4) must be positive14 The potential energy stored in a compressed
spring is to the change in the spring’s length as the
kinetic energy of a moving body is to the body’s
(1) speed (3) radius
(2) mass (4) acceleration
18 What is the resistance at 20.°C of a 2.0-meter
length of tungsten wire with a cross-sectional
area of 7.9 × 10–7 meter2?
(1) 5.7 × 10–1 Ω (3) 7.1 × 10–2 Ω
(2) 1.4 × 10–1 Ω (4) 4.0 × 10–2 Ω
30 What is the speed of a ray of light
(f = 5.09 × 1014 hertz) traveling through a block
of sodium chloride?
(1) 1.54 × 108 m/s (3) 3.00 × 108 m/s
(2) 1.95 × 108 m/s (4) 4.62 × 108 m/s
32 Two waves traveling in the same medium and
having the same wavelength (λ) interfere to
create a standing wave. What is the distance