Answer:
The ultrasonic wave it to high of a frequency for us to hear it.
Explanation:
A ultrasonic wave is used for a ultrasound to look at a fetus. The wave is way up on the frequency level for hearing.
Answer: b
Explanation: the two pieces will repel as both have obtained a static charge.
Answer:
<h3>Using Newtons Second law of motion</h3>
Explanation:
Newtons Second law of motion states that the rate of change momentum of a system is directly proportional to unbalanced External force acting on it.
if we consider all colliding particles as a system we can see there is no external forces acting on the system. the forces that present here due to collision are internal forces
so As per newtons second law moment should be conserved for the colliding particles.
Answer:
a)
Nm⁻¹
b)
Hz
c)
ms⁻¹
d)
m
e)
ms⁻²
f)
m
Explanation:
a)
= force required to hold the object at rest connected with stretched spring = 27 N
= stretch in the spring from equilibrium position = 0.2 m
= force constant of the spring
force required to hold the object at rest is same as the spring force , hence
inserting the values
Nm⁻¹
b)
frequency of the oscillations is given as
inserting the values
Hz
c)
= Amplitude of oscillations = 0.2 m
= angular frequency
Angular frequency is given as
rads⁻¹
Maximum speed of oscillation is given as
ms⁻¹
d)
maximum speed of the object occurs at the equilibrium position, hence
m
e)
Maximum acceleration of oscillation is given as
ms⁻²
f)
maximum acceleration occurs when the object is at extreme positions, hence
m