Answer:
<u>Rigid bodies:</u> Options d and e
<u>Rigid bodies' system:</u> options f, g and h
<u>Non-rigid bodies:</u> Options a, b and c
Explanation:
The above classification of the mentioned objects into rigid bodies, non rigid bodies and system of rigid bodies can be explained as :
Rigid body: A body which does not undergo any change in its form or shape on application of externally applied load or force is said to be a rigid body.
System of Rigid bodies:
A system of rigid bodies is different from any other element system as in this the bodies constituting the system must be rigid bodies.
Non-rigid bodies:
A body which undergoes a change in its form or shape on application of externally applied force or load is said to be a non-rigid body.
Answer:
A simple machine that may be used the most often is called the wheel and axle. The wheel and axle has two basic parts: wheel and axle. It has two circular objects which includes a larger disc and a small cylinder both joined at the center.
Explanation:
Answer:
soundproofing or absorbing
Explanation:
Acoustics is the study of waves, vibrations and sound and its most common applications lie in the sound and noise control industries. Acoustic protection is the application of soft and porous material to protect individuals against undesirable sounds and noises.
cushioned seats and carpeted floors are used in soundproofing to block the unwanted noise and sound.
The Cheapest Ways To Soundproof A Room
1. Rugs:
Rugs make excellent vibration dampeners.
2. Weather Stripping:
If you know that sound is getting into your room via the door or the windows then a very cheap and effective solution can be to use weather stripping.
3. Blankets.
4. Curtains.
5. Egg Cartons.
Homemade Soundproofing Panels
4. Dark Energy.
This is the mysterious force causing the expansion of space. No one has ever seen this force.
Answer: 0.4 Amps
Explanation:
Voltage of battery = 24 Volts
Current I = ?
Resistance of searchlight (R)= 60ohms (Ω is the symbol for ohms)
Then, apply the formula for ohms law
Voltage = Current x resistance
i.e V = I x R
24V = I x 60Ω
I = 24V / 60Ω
I = 0.4 Amps (Amps is the unit of current)
Thus, the current in the circuit is 0.4 Amps
