ANSWER:
22 Hz.
Explanation:
Frequency = (speed) divided by (wavelength) = (330) / (15) =
<u>Answers</u>
(a) 6.75 Joules.
(b) 5.27 m/s
(c) 0.75 Joules
<u>Explanation</u>
Kinetic energy is the energy possessed by a body in motion.
(a) its kinetic energy at A?
K.E = 1/2 mv²
= 1/2 × 0.54 × 5²
= 6.75 Joules.
(b) its speed at point B?
K.E = 1/2 mv²
7.5 = 1/2 × 0.54 × V²
V² = 7.5 ÷ 0.27
= 27.77778
V = √27.77778
= 5.27 m/s
(c) the total work done on the particle as it moves from A to B?
Work done = 7.5 - 6.75
= 0.75 Joules
Answer:
a) 
b) 
c) 
d) 
Explanation:
Given:
- distance down the field in the first interval,

- time duration of the first interval,

- distance down the field in the second interval,

- time duration of the second interval,

- distance down the field in the third interval,

- time duration of the third interval,

a)
velocity in the first interval:



b)
velocity in the second interval:



c)
velocity in the third interval:



d)
We know that the average velocity is given as the total displacement per unit time.



I can help you draw the ray diagram.
Answer:
14.2
Explanation:
find horizontal force of the weight = 2.5kg x 9.8 Sin30 = 12.3 N
to prevent the sliding she needs to pull horizontally
Fh = 12.3 /Cos 30 =14.2N