Answer:
The average acceleration, aₐ = 6 m/s²
Explanation:
Given that,
The initial speed of the roller coaster car, u = 4 m/s
The final speed of the roller coaster car, v = 22 m/s
The time taken to attain the final speed is, t = 3 s
The average acceleration is defined as the change in the final velocity to initial velocity by time.
aₐ = v - u / t m/s²
Substituting the values in the above equation,
aₐ = 22 m/s - 4 m/s / 3 s
= 6 m/s²
Hence, the average acceleration of the roller coaster is aₐ = 6 m/s²
The correct answer is: Option (D) 6 aluminum and 9 oxygen!
Explanation:
Since the one molecule of aluminium and oxygen is Al2O3 (Aluminum oxide). It has 3 oxygen atoms and 2 aluminium atoms. It find the atoms for the 3 molecules, multiply them with 3.
3 * 3 oxygen atoms = 9 oxygen
3 * 2 aluminum atoms = 6 aluminum ( Option D)
This number is known as mechanical advantage
A: false
Answer:
On removal to the glass rod the leaves of the electroscope will disperse away under the influence of the positive charge due to deficiency of electrons.
Explanation:
When a glass rod is rubbed against a nylon then the electrons from the surface of the glass rod get transferred to the nylon piece and as a result the glass rod attains positive electrostatic charge.
When this positively charged rod is brought close to the knob of an electroscope then the electrons from that metallic of the electroscope feel attraction and move toward the glass rod get concentrated on the knob.
- In this situation when any of our body part comes in direct contact to the knob these static concentrated charges get a path to flow from high concentration to a lower concentration under the influence of the electrostatic force of the rod.
- So these charges flow into our body from the knob.
- Our body acts as a reservoir for the charges on the metallic knob.
- Now after the electrons form the knob are transferred to the person's body the electroscope becomes electron deficient and hence positively charged.
- So now, on removal to the glass rod the leaves of the electroscope will disperse away under the influence of the positive charge.
