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Murljashka [212]
3 years ago
11

What can parents do if they find a mistake in the student records?      A. They can’t do anything B. Make a correction themselve

s C. Transfer the child to another school D. Ask the school to make the correction
Physics
2 answers:
Tanya [424]3 years ago
6 0

Answer: Option (D) is the correct answer.

Explanation:

If parents find a mistake in the student records then the parents should talk to the respective teacher of their child and bring this thing into the teacher's notice.

By doing so, the teacher will also in future keep in mind to verify the records correctly once again before forwarding the record to parents or other higher authorities.

Also, the parents can talk to the school so that correction can be made into the students's records.    

Lelechka [254]3 years ago
5 0
D. Ask the school to make the correction
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Which of the following electromagnetic waves is not used for communication?
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Microwaves and radio waves are employed in radio and satellite communications while infrared waves are used in remote controls and infrared features of new phones and other electrons. However, gamma rays have far too much energy and cause damage to the body. They are not used in communication.
The answer is A.
8 0
3 years ago
A proton moving at 3.0 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is a
GuDViN [60]

Answer:

The time it takes the proton to return to the horizontal plane is 7.83 X10⁻⁷ s

Explanation:

From Newton's second law, F = mg and also from coulomb's law F= Eq

Dividing both equations by mass;

F/m = Eq/m = mg/m, then

g = Eq/m --------equation 1

Again, in a projectile motion, the time of flight (T) is given as

T = (2usinθ/g) ---------equation 2

Substitute in the value of g into equation 2

T = \frac{2usin \theta}{\frac{Eq}{m}} =\frac{m* 2usin \theta}{Eq}

Charge of proton = 1.6 X 10⁻¹⁹ C

Mass of proton = 1.67 X 10⁻²⁷ kg

E is given as 400 N/C, u = 3.0 × 10⁴ m/s and θ = 30°

Solving for T;

T = \frac{(1.67X10^{-27}* 2*3X10^4sin 30}{400*1.6X10^{-19}}

T = 7.83 X10⁻⁷ s

6 0
3 years ago
Calculate the wavelengths of the first five emission lines of the Balmer series for hydrogen
In-s [12.5K]

Answer:

Explanation:

The Balmer series in a hydrogen atom relates the possible electron transitions down to the n = 2 position to the wavelength of the emission that scientists observe. In quantum physics, when electrons transition between different energy levels around the atom (described by the principal quantum number, n) they either release or absorb a photon. The Balmer series describes the transitions from higher energy levels to the second energy level and the wavelengths of the emitted photons. You can calculate this using the Rydberg formula.

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2 years ago
Which tool would you use to measure the amount of rainfall
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A rain gauge! Hope this helps!
3 0
3 years ago
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A ball is released from a tower at a height of 100 meters toward the roof of another tower that is 25 meters high. The horizonta
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-- During the time the ball is flying from the high roof to the low roof,
it's going to fall (100-25) = 75 meters.
How long does it take an object dropped from rest to fall 75 meters ?

Distance = (1/2) · (gravity) · (time)²

75 m = (4.9 m/s²) · (time)²

Time² = (75 m) / (4.9 m/s²)
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So the ball has to cover the horizontal distance of 20 meters 
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Distance = (speed) · (time)

20 m = (speed) · (3.91 sec)

Speed = (20 m) / (3.91 sec)

Speed  =  5.11 m/s
7 0
3 years ago
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