A boy is running with kinetic energy of 810j if the boy has a mass of 80kg what is his peed

Answers

Answer 1

Answer: KE=(1/2)mv² ⇒ v=√(2KE/m)

Data:
KE=kenetic energy=810 J
m=mass=80 Kg
v=velocity (speed)

v=√(2KE/m)
v=√(2*810 J/80 Kg)=4.5 m/s.

answer: his speed is 4.5 m/s.

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PLEASE HELP!! Use the information below to solve this problem: A note has a wavelength of 0.65551 m. If the speed of sound is 343.00 m/s, what pitch is this note? speed of sound in air: 343 m/s

A. 440.00 Hz
B. 493.88 Hz
C. 523.25 Hz
D. 587.33 Hz
E. 659.26 Hz
F. 698.46 Hz
G. 783.99 Hz

Answers

Answer:

Explanation:

Given that a note has a wavelength of 0.65551 m. If the speed of sound is 343.00 m/s, the pitch of the note is the same as the frequency.

Sound Velocity = product of frequency and wavelength.

Substitute wave speed and wavelength into the formula

343 = f × 0.65551

Make f the subject of formula

F = 343 / 0.65551

F = 523.58 Henz

Therefore, the pitch of the note is 523.52 Hz approximately

The correct answer is option C

Newton's Third Law of Motion is often called the law of intertia.

True
False

Answers

This is False. Newton's First Law of Motion is often called the law of inertia.

Which one of the following temperatures is equal to 5°C?

Answers

5°C = 41°F = 278 K .

Answer:

278 K

Explanation:

The temperature of 20 liters of helium gas is increased from 100°K to 300°K. If the pressure was kept constant, the new volume will be how many liters? a) 6.7 b) 30 c) 60 d) 120 e) None of these

Answers

Answer:

New volume (V2) = 60 liter

Explanation:

Given:

Amount of helium (V1) = 20 Liter

Temperature (T1) = 100°K

Temperature (T2) = 300°K

Find:

New volume (V2)

Computation:

According to Gas Law:

V1 / T1 = V2 / T2

20 / 100°K = V2 / 300°K

V2 = 60 liter

New volume (V2) = 60 liter

If you lift a 16 kg child from the floor to her bed, which is 1 meter high, how much have you increased her potential energy.

Answers

GPE=mgh
GPE=16•9.8•1

What can you assume has happened if an electron moves to a higher energy level

Answers

EXPLANATION :

As per the question, the electron has jumped from ground state to higher energy level.

From Bohr's postulate, we know that electron can only move to higher excited state when the energy equivalent to excitation energy has been given to it. Otherwise, the electron can not move from ground state to the excited state.

Hence, it is obvious that the electron might have excited to higher energy level by providing sufficient energy from outside.

The external source might be light of suitable frequency or any electric or thermal source.

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