The work done on the block is B) 400 J
Explanation:
The work done when lifting an object is equal to the change in gravitational potential energy of the object:
where
m is the mass of the object
g is the acceleration of gravity
is the change in height of the object
In this problem we have:
(mg) = 100 N is the weight of the block (product of mass and acceleration of gravity)
is the change in heigth of the object
Substituting, we find the work done:
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As charges move in a closed loop, they gain as much energy as they lose.
<h3>What is principle of
conservation of energy?</h3>
- According to the principle of conservation of energy, in a closed or isolated system, the total energy of the system is always conserved.
- The energy gained by the particles or charges in a closed system is equal to the energy lost by the charges.
Thus, we can conclude the following based on principles of conservation of energy;
- As charges move in a closed loop, they gain as much energy as they lose.
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Answer:
17.71 kgm²s⁻¹
Explanation:
<em>Angular momentum </em>is the rotational momentum , which is quite similar to linear momentum.main difference is that here we consider a rotational motion.
*The total angular momentum of a closed system remains constant.
by definition ,
angular momentum = moment of inertia (I) × angular velocity (ω)
where
<em>ω = 2π × frequency (f)</em> = 2π × 6
<em>angular momentum = 0.47 × 12π = 17.71 kgm²s⁻¹</em>
Answer:
f = 7.97 x 10⁶ Hz = 7.97 MHz
Explanation:
The speed of a wave is given by the following formula:
where,
v = speed of the ultrasound wave through human tissue = 1540 m/s
f = frequency of ultrasound wave required = ?
λ = wavelength of ultrasound waves = smallest detail required = 0.193 mm
λ = 0.193 mm = 1.93 x 10⁻⁴ m
Therefore,
<u>f = 7.97 x 10⁶ Hz = 7.97 MHz</u>
B.) "Nuclear Change" <span> releases a large amount of energy per gram of material as a result of the conversion of matter into energy
Hope this helps!</span>