Answer:
Only kinetic.
Explanation:
Potential energy means it has the potential to move. Not something already in motion.
-- A little girl has a voice with high pitch (high frequency)
-- Speaking quietly, she's making sounds with low amplitude
The wave with the high frequency and low amplitude is <em>C</em> .
Yes your right the answer is D
Answer:
B) T > ma.
Explanation:
To solve this problem, we have to analyze the forces acting in the horizontal direction.
In the horizontal direction, we have:
- The horizontal component of the tension in the wire,
, where T is the magnitude of the tension and
the angle that the wire makes with the horizontal
Since this is the only force acting on the box in the horizontal direction, this is also the net force, so it is equal to the product of mass and acceleration (Newton's second law of motion):

where
m is the mass of the box
a is the acceleration
We can rewrite the equation as

The angle in this problem is
, so

Therefore, the correct option is
B) T > ma.
Answer:
m = 160 g
Explanation:
Density = Mass / Volume
D = m/v
Step 1: Define
D = 2 g/cm³
V = 4 cm · 10 cm · 2 cm = 80 cm³
M = ?
Step 2: Substitute and solve for m
2 g/cm³ = m/80 cm³
m = 160 g